lg 42pc5dc training manual [et]
TRANSCRIPT
Plasma Display Panel Troubleshooting – Spring 2008 1
Advanced Single Scan Troubleshooting
42PC5DC Plasma Training Manual
Plasma Display Panel Troubleshooting – Spring 2008 2
Troubleshooting
•Y SUS Board
•Z SUS Board•Y Drive Boards
•Control Board•X Drive Boards
Circuit Board Operation, Troubleshooting and Alignment of :•Switch mode Power Supply
•Main Board
Section 1
Section 2
Contact Information, Preliminary Matters, Plasma Overview, General Troubleshooting Steps, Disassembly Instructions,Voltage and Signal Distribution
Overview of Topics to be Discussed
Plasma Display Panel Troubleshooting – Spring 2008 3
42PC5DC Plasma Display
Troubleshooting
Section 1
This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.
Basic Troubleshooting Techniques generally not thought of , which can save time and money will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and Layout of the Plasma Display Panel.
At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to remove and replace safely any Circuit Board or Assembly.
OUTLINE
Plasma Display Panel Troubleshooting – Spring 2008 4
IMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.
Troubleshooting
CAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an product could result in physical injury.
Safety and Cautions
Plasma Display Panel Troubleshooting – Spring 2008 5
ESD NOTICE
Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in the product. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.
Troubleshooting
REGULATORY INFORMATIONThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.
ESD Notice and Regulatory Information
Plasma Display Panel Troubleshooting – Spring 2008 6
Contact Information
Customer Service (and Part Sales) (800) 243-0000Technical Support (and Part Sales) (800) 847-7597
USA Website (GCSC) aic.lgservice.comCustomer Service Website us.lgservice.com
LG CS Academy lgcsacademy.com
Published March 2008 by LG Technical Support and Training
Troubleshooting
The responsible party for this device’s compliance is:
COMPLIANCE
LG Electronics Alabama, Inc. 201 James Record Road,
Huntsville, AL, 35824.
Plasma Display Panel Troubleshooting – Spring 2008 7
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.
3. Check details of defective condition and history. Example: Y Board Failure, Mal-discharge on screen, etc.
1. Approximately 10 minute pre-run time is required before any adjustments are performed.
2. Refer to the Voltage Sticker inside the Panel when making adjustments on the Power Supply, Y SUS and Z SUS Boards.
Always adjust to the specified voltage level (+/- ½ volt).
3. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, check that the Power Supply
and Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.
4. C-MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity.
5. The PDP Module must be carried by two people.
6. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.
7. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.
Checking Points to be Considered
TroubleshootingSafety and Handling Regulations
Plasma Display Panel Troubleshooting – Spring 2008 8
Troubleshooting
Define, Localize, Isolate and Correct
Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc.
Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.
Isolate To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes “glitches” or “road bumps” will be an indication of an imminent failure.
Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.
Basic Troubleshooting Steps
Plasma Display Panel Troubleshooting – Spring 2008 9
This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42PC5DC Advanced Single Scan Plasma Display Panel.
Troubleshooting
Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printed circuit boards and be able to identify each board.
42PC5DC DISASSEMBLY SECTION
Plasma Display Panel Troubleshooting – Spring 2008 10
Troubleshooting42PC5DC
Remove the 33 screws as shown (the stand will not need to be removed).
Back Cover Removal
42PC5DC Removing the Back Cover
Plasma Display Panel Troubleshooting – Spring 2008 11
Troubleshooting
42PC5DC Back Cover Removed
Z SUS Board
SMPS Board
Y SUS Board
MAIN Board
LEFT X RIGHT X
Y
Drive
Board
42PC5DC Circuit Board Layout and Identification
Plasma Display Panel Troubleshooting – Spring 2008 12
Troubleshooting
Control
Right X BoardLeft X Board
Logic Signals to the Y SUS Board
Logic Signals to the Z SUS Board
5V, VS, VA to the Z SUS
5V, VS, VA to the Y SUS
Y/Z ER
42PC5DC Circuit Board Layout and Identification Continued
Plasma Display Panel Troubleshooting – Spring 2008 13
Software UpgradesMenu, Option, 7, (7 times)
Troubleshooting42PC5DC Circuit Board Layout and Identification Input Jacks
Plasma Display Panel Troubleshooting – Spring 2008 14
Troubleshooting
Notes: 1) All Plugs listed are from left to right Pin 1,2, 3, ETC.2) Remember to be cautious of ESD as semiconductors are CMOS and prone to static failure!
Switch Mode Power Supply Board Removal
Remove 8 screws securing the Power Supply and disconnect Connectors from Plugs CN1 ( AC Input ), P812 ( 5V, GND, VA, GND, GND, GND, NC, VS, VS ), P800 ( AC DET, RL ON, STB5V, GND, VS ON, 5V DET, M5V-ON, GND, NC, 6V, GND, 3.4V-ON ), P802 ( 19V, 19V, GND, GND, 6V, GND, 3.4V, GND,12V, GND ), and P803 (3.4V, 3.4V, GND, GND, 6V, 6V, GND, GND, 12V, 12V, GND ) after the board is replaced readjust RV901 ( VS ) andRV951 ( VA ) for DC voltage levels indicated by the Voltage Label in the upper left corner of the Panel.
Y SUS Board Removal
Remove 5 screws securing the Y SUS Board and disconnect Connectors from Plugs P1 ( Logic Signals from the Control Board ), P3 ( 5V, GND, VA, GND, GND, GND, NC, VS, VS ) P4 ( 5V, 5V, GND, GND, GND, NC, VA, VA, NC, VS, VS, VS ), P5, P6, ( Drive Signals to the Y Drive Board ), and P7 ( YER, YER, YER, YER ).
Y Drive Board Removal
Remove 3 screws securing the Y Drive Board and disconnect Connectors from Plugs P9 ( Logic and Drive Signals from the Y SUS Board for the Bottom Half of the Display ), P11 ( Logic and Drive Signals from the Y SUS Board for the Top Halfof the Display ) P1, P2,P3, P4, P5, P6, P7, and P8 ( Ribbon Cable to the Display Panel ) .
Z SUS Board Removal
Remove the 6 screws securing the Z Sus Board and disconnect connectors from Plugs P1 ( 5V, 5V, GND, GND, GND, NC, VA, VA, NC, VS, VS, VS ), P4 ( GND, GND, 5V, 15V, NC, VA, VA ), P5 ( Logic Signals from the Control Board ), P6( ZER, ZER, ZER, ZER ), P2 ( FPC to Display Panel ), P3 ( FPC to Display Panel).
42PC5DC Removing the Circuit Boards (page 1)
Plasma Display Panel Troubleshooting – Spring 2008 15
Troubleshooting
Main Board Removal
Remove the Input Jack Faceplate by first removing 2 screws by the AC Input Filter, 4 screws at the HDMI Input Plugs,the nut and washer from the Antenna / Cable Input and the RS232 and PC Cable Securing Posts, the Faceplate can now be removed. After removing the Faceplate, remove the 2 screws holding the bottom of the Main Board to the support frame,and release the 2 Plastic Mounting Posts at the top of the board. Disconnect the connectors from Plugs P4004 ( AC DET,RL-ON, ST- 5V, GND, INV-ON/OFF, 5V-MNT, POD/INV, ST-5V, GND, PWM, 6V, GND, LIVE-ON ), P4005(3.3V,3.3V,GND, GND, 6V, 6V, GND, GND, 12V, 12V,GND, GND ), P4003 ( 19V, 19V, GND, GND, NC, GND, 3.3V, GND, 12V, GND ), P6001 ( LVDS ), P7002 ( Serial Data to the Control Board ), P7009 ( Right Speaker ), P7010 ( Left Speaker ), P5002 ( AV Input 2 ), P4007 ( Keyboard ).
42PC5DC
Control Board Removal
Remove 2 screws securing the Main Board Mounting Bracket Assy. and disconnect connector from Plug P3 ( LVDS ) on the Control Board, remove CN1 from the SMPS Board, and carefully place the Bracket Assy. off to the side. Remove 4Screws securing the Control Board and disconnect connectors from Plugs P2 ( Y SUS Logic Signals ), P1 ( Z SUS Logic Signals ), P7 ( Left X Board RGB Logic Signals ), P8 ( Right X Board RGB Logic Signals ) and P6 Serial Data to the Main Board.
X Board Removal
X Board Removal will require the most disassembly of all the boards. Remove 2 screws securing the Main Board Mounting Bracket Assy. and disconnect connector from Plug P3 ( LVDS ) on the Control Board, remove CN1 from the SMPS Board, and carefully place the Bracket off to the side. All the Brackets and Assemblies marked with an “A” will need to be removed including the Stand. Before an X Board can be removed the Heat Sink Assembly will also need Removal.
42PC5DC Removing the Circuit Boards (page 2)
Plasma Display Panel Troubleshooting – Spring 2008 16
Troubleshooting
42PC5DC
A A
A
A
Main Board Mounting Bracket
Locking Tabs
LVDS Cable Connector
Left X Board Removal
Remove 20 Screws securing the X Board Heat Sink Assy. and 5 Screws securing the Left X Board. Disconnect connectors to Plug P107 ( RGB Logic Signals from the Control Board ), P108 ( GND, GND, 5V, 15V, NC, VA, VA ) carefully remove the FPC cables that supply the TCP IC’s.
42PC5DC Removing the Circuit Boards (page 3)
Plasma Display Panel Troubleshooting – Spring 2008 17
Z SUS Board
5v, VA, VS
5V,VA, VS5v, VA
5v,15v, VA
Switch Mode Power Supply
Y SUS Board
ControlBoard
5v
5v, 15V, VA
Logic Signals
RGB Logic
Signals
RGBLogic
Signals
Logic Signals
Y Drive
Y Drive
Drive Signal
Troubleshooting
AC Input Filter
Logic Signals
Display Panel Display Panel
Main BoardLVDS
Left X Drive Board Right X Drive Board
Display Panel
Control/STB5V19, 12, 6, 3.4
Voltages
5V
Y/Z ERY/Z ER
5v, 15V, VA
5V
42PC5DC Signal and Voltage Distribution
Plasma Display Panel Troubleshooting – Spring 2008 18
Troubleshooting
++
KEY BOARD
CONTROL BOARD
MAIN BOARD
AV INPUT
POWER SUPPLY
Z SUS BOARDY SUS BOARD
LEFT X BOARD RIGHT X BOARD
Y
DRIVE
BOARD
AC
IPM
IPM
Z BIAS BLOCK
MCM
P812
P803
P802
P800
P6
P5
P1
P3
P4P7
P11
P9
P1
P6
P5
P4
P3
P2
P2
P6 P3
P1
P8P7
P109P114P108P107
Tuner IC1001
P4004 P4005 P4003 P7002 P6001
P4007 P5002
INPUT JACKS
SC101
42PC5DC Wiring and Cable Interconnect
Plasma Display Panel Troubleshooting – Spring 2008 19
Troubleshooting
At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls. The technician should be able with confidence to troubleshoot a circuit board failure, replace the defective circuit and perform all necessary adjustments.
This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply,Y SUS Board, Y Drive Board, Z SUS Board, Control Board, Main Board and the X Drive Boards.
42PC5DC TROUBLESHOOTING SECTION
Plasma Display Panel Troubleshooting – Spring 2008 20
Model : PDP 42 X 4A ### All Voltage : DC 5.0VVa : 60 Vs : 190N.A / 145 / N/A / N.A / 150Max Watt : 330 W ( Full White )
• DC Voltages developed on the SMPS• Adjustments VA and VS
• Always refer to the Voltage Sticker located in the upper left side of the PDP for the correct voltage levels for the VA, VS, Vscan, and Z Bias as they will vary from Panel to Panel.
Z_BIAS
Troubleshooting
-VY
This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single Scan 42” Plasma Display. Upon completion of the section the technician will have a better understanding of the operation of the Power Supply circuit and will be able to locate voltage and test points needed for
troubleshooting and alignments.
42PC5DC SWITCH MODE POWER SUPPLY SECTION
Plasma Display Panel Troubleshooting – Spring 2008 21
Troubleshooting
There are 2 different Power Supply Boards used in the 42PC5DC Model Lines. One board ( EAY32927901 ) and the other ( EAY32808901 ).
Both Circuit Boards operate the same and substitute each other although care must be taken because of the differences, not only are the connectors marked differently but they are reversed top to bottom, except for the VA and VS Connector which although marked with a different connector number is pinned out the same.
Another difference is that the VA and VS Controls have circuit symbol numbers reversed between the boards. VR901 on one board is VS and on the other it will be VA!
42PC5DC SMPS Two Different Power Supply Used
Plasma Display Panel Troubleshooting – Spring 2008 22
Troubleshooting
The Switch Mode Power Supply Board Outputs to the :
VAY SUS Board
Main Board
VS
5V Vcc
Primarily responsible for Display Panel Vertical Grid
Drives the Display Panel Horizontal Grid
Used to develop Bias Voltages on the Y SUS, Z SUS,X Drive, and Control Boards
19V Audio B+ Supply
12V
6V
3.4V
Signal Processing Circuits
Signal Processing Circuits
Control Circuits
Adjustments There are 2 adjustments located on the Power Supply Board VA and VS. Both adjustments are made with relation to Chassis Ground.
VA
VS
RV951
RV901
42PC5DC SMPS Outputs
Plasma Display Panel Troubleshooting – Spring 2008 23
42PC5DC SMPS Layout EAY32927901 Troubleshooting
P12
P3
P2
P1
CN1
VR 901 (VS)
380V Source
AC Input
VS Source
VA Source
Standby 5V 19v, 12v,6v, 3.4v Source
EAY32927901
U702
VR 951 (VA)
Plasma Display Panel Troubleshooting – Spring 2008 24
Troubleshooting
EAY32808901
380V Source
AC Input
VS Source
VA Source
Standby 5V 19v, 12v,6v, 3.4v Source
U701
P800
P802
P803
P812
SC101
VA-ADJ VR901
VS-ADJ VR951
42PC5DC SMPS Layout EAY32808901
Plasma Display Panel Troubleshooting – Spring 2008 25
Troubleshooting
AC Voltage is supplied to the SMPS Board at Connector CN1 from the AC Input Filter. Standby 5V is developed from the Circuits of Transformer T201, RC401, RC402 and Q422. Standby 5V is then routed to 2 places, the Micro Processor IC4015 on the Main Board and to the Sub Micon U702 on the SMPS, where AC – ON / DETECT is developed and sent from Pin 1 of Connector P1 to IC4015. With the presence of both 5V STB and AC – ON/ DETECT, IC4015 is active.
When IC4015 receives an “ ON “ Command from either the Keyboard or the Remote IR Signal it outputs a high to RL-ON which enters the SMPS Board at Pin 2 of P1 and M5V-ON. The high RL-ON Voltage is sensed by the Sub Micon U702 which causes the Relay RL102 to close turning on the 380V Supply developing the 19V,12V and 6V Voltage Sources.
The M5V-ON Line located on the SMPS at Connector P1 (Pin 7) is sensed by U702 the Sub Micon IC turning on the 5V VCC line.
The last step to bring the supply to “Full Power” occurs when IC4015 brings the VS-ON line high at Pin 5 of Connector P1 the SMPS Board which when sensed by the U702 Sub Micon IC turns on the VA and VS Supplies.
The Operating Sequence discussed above can be confirmed by using the Oscilloscope in the XY Mode. Start by connecting Channel 1 of the Oscilloscope to 5V STB and Channel 2 to AC DET the delay between 5V STB and AC DET can be noted. Next Connect Channel 1 to RL ON and Channel 2 to VS ON again the delay between the 2 voltages can be noted. Connect Channel 1 to RL ON and Channel 2 to M5V-ON the 2 supplies come up at the same time proving the 5V VCC line becomes active before the VS ON line.
EAY32927901
The 3.4V line at P3 (Pins 1 and 2) also P2 (Pin 7) becomes active when Pin 13 the 3.4V-ON line of connector P1 goes high turning on the 3.4V Supply.
42PC5DC SMPS Operation and Troubleshooting PG 1 of 2
Plasma Display Panel Troubleshooting – Spring 2008 26
42PC5DC SMPS Operation and Troubleshooting Pg 2 of 2 Troubleshooting
Understanding the Power On Sequence when Troubleshooting a possible Power Supply Failure will simplify the process of isolating which circuit board failed to operate properly. In this Section we will investigate the Power on Sequence and examine ways to locate quickly where the failure occurred.
Check the Power On LED for Operation, a Red LED indicates a presence of 5V STB and AC-ON/DETECT.Failure of the Power ON LED to light is an indication of loss of 5V STB or AC ON/ Detect remember the 5V STBand AC-ON/DETECT are developed on the SMPS and sent to the Main Board.
Listen for Relay Click, the click of the Relay is an indication of RL-ON going high. RL-ON is sent from the Main Board to the SMPS and when present U702 controls the Relay Operation. RL-ON going High and no Relay is a failure of the SMPS, RL-ON staying low is a failure of the Main Board.
Relay Operation means that the SMPS if working properly will output 19V, 12V and 6V to the Main Board. If the Relay closed and these supplies failed suspect a problem with the SMPS.
The next step of operation calls for the M5V-ON line from the Main Board to the SMPS to go high. A high on the M5V-ON Line activates the 5V Vcc line. Loss of 5V Vcc results in no Raster, no Reset, no Y, Z, Control or X Boardoperation. Loss of 5V and M5V-ON going high could be caused by any of these boards or failure of the SMPS. M5V-ONstaying low indicates a problem on the Main Board.
Remember if a voltage is missing check for proper resistance before proceeding
VS-ON is the last step of the Power Sequence and is responsible for bringing the VS and VA Voltages up. The VS-ON signal is sent from the Main Board to the SMPS as a high, VS and VA and full operation of theDisplay Panel are now enabled. Loss of VS-ON results in loss of VA and VS and no Raster, no Resetbut Audio would be present. If VS-ON went high and VS and VA where missing the problem could be causedby a failure on the SMPS or a circuit using these voltages. A Resistance check should narrow the possiblefailures quickly.
3.4V-ON will activate the 3.4V Supply to the Main Board, at this time Audio should be present as the Tuner and Signal Processing circuits are operational.
Plasma Display Panel Troubleshooting – Spring 2008 27
Troubleshooting
The Operation of the Power Supply can be Confirmed by removing the SMPS Board and placing it in theService Position. Place two 60Watt lamps in series across pin 9 ( VS ) and 5 ( Ground ) of P812.
Apply AC Power and check for 5V STB and AC-ON / DETECT at P800, if present remove AC Power and install a 100Ω ¼ watt resistor from 5V STB to RL-ON on Connector P800. Apply AC PowerThe AC Relays should close and 19V, 12V and 6V should be Present. If ok remove AC Power.
Install a 100Ω ¼ watt resistor from 5V STB to M5V-ON on Connector P800, 5V Vcc should now become active, If present remove AC Power.
Install a 100Ω 1/4 Watt resistor from 5V STB to VS-ON on Connector P800, VS and VA should now be present. This test will confirm the normal operation of the SMPS.
This test can confirm the proper operation of the SMPS without the need to exchange the board.
EAY32808901
Solder a 100Ω ¼ watt resistor from 5V STB to 3.4V-ON at P800. Apply AC Power the 3.4V Supply should now be present. If ok remove AC Power.
42PC5DC SMPS How to Turn On EAY32808901
Plasma Display Panel Troubleshooting – Spring 2008 28
Troubleshooting
Resistors 100 Ohms ¼ Watt
AC - ON
RL-ON
STB 5V
GND
VS-ON
5V _ MT
M5V-ON
P1
STB 5V
GND
NC
6V
NC
3.4V_ON
Switch ModePower Supply
P12
CN1
EAY32927901
5V VCC
P3
P2
P1
+
+
VS-ADJ VR901
VA-ADJ VR951
VSVSNC
GNDGND
GND
VAGND
Model : PDP 42 X 4A ### All Voltage : DC 5.0VVa : 60 Vs : 190N.A / 145 / N/A / N.A / 150Max Watt : 330 W ( Full White )
( 2 ) 60WLight Bulbs
AC IN
42PC5DC SMPS Light Bulb Test EAY32927901
Plasma Display Panel Troubleshooting – Spring 2008 29
Troubleshooting
Switch ModePower Supply
SC101
EAY32808901VSVSNC
GNDGND
GND
VAGND5V VCC
P803
P802
P800
+
+
VS-ADJ VR951
VA-ADJ VR901
Resistors 100 Ohms ¼ Watt
AC - ON
RL-ON
STB 5V
GND
VS-ON
5V _ MT
M5V-ON
P800
STB 5V
GND
NC
6V
NC
3.4V_ON
( 2 ) 60WLight Bulbs
Model : PDP 42 X 4A ### All Voltage : DC 5.0VVa : 60 Vs : 190N.A / 145 / N/A / N.A / 150Max Watt : 330 W ( Full White )
P812
42PC5DC SMPS Light Bulb Test EAY32808901
Plasma Display Panel Troubleshooting – Spring 2008 30
Operating Voltages
Troubleshooting
This Section of the Presentation will cover troubleshooting the Y SUS Board for the SingleScan Plasma. Upon completion of the Section the technician will have a betterunderstanding of the operation of the circuit and will be able to locate voltage andresistance test points needed for troubleshooting and alignments.
SMPS Supplied VA VS VCC 5V
Y SUS Developed -VY V SET DNRamp UPY ER
VA supplies the Panel Vertical Grid VS Supplies the Panel Horizontal Grid5V Supplies Bias to Y SUS, Z SUS, Control, and X Boards
-VY Sets the Negative excursion of the Y SUS Drive Waveform V Set Down sets the Pitch of the Bottom Ramp of the Drive WaveformRamp UP sets Pitch of the Top Ramp of the Drive WaveformY ER is being used to Monitor IPM Currents
AdjustmentsDC Voltage and Waveform ChecksResistance Measurements
42PC5DC Y-SUS SECTION
Plasma Display Panel Troubleshooting – Spring 2008 31
Troubleshooting
V SET Down
RAMP UP
-VY
P3 P1
P4
P7
P6 P5
IC13
Output to Y Drive Output to Y Drive
Model : PDP 42 X 4A ### All Voltage : DC 5.0VVa : 60 Vs : 190N.A / 145 / N/A / N.A / 150Max Watt : 330 W ( Full White )
-VY TP R65
42PC5DC Y-SUS Layout with Panel Label
Plasma Display Panel Troubleshooting – Spring 2008 32
Troubleshooting
FS1
FS2
FS3
FS4
Logic Signals from the Control Board
VS, VA, 5V VCC from the SMPS
VS, VA, 5V VCC to the Z SUSY/Z ER
VR3Ramp up
VR2V SET DOWN
VR4 -VY
FS5
FS1 VA Fuse
FS2 VS Fuse
FS3 5V
FS4 GND ReturnFS5 5V
IC13
Cathode D34 18V
-VY TP R65
42PC5DC Y-SUS Layout
Plasma Display Panel Troubleshooting – Spring 2008 33
Troubleshooting
VS
FL1
FS2
YER
SUS_OUT
P5
P6
YER
FS3
P1
P3
IC8
IC4
IC5
VS
VA
5V
IC14IC20
IC21
IC22
P8
IC7
18VIPM IC29
GRD
IPM
IC13
FS4
IPM 18V (Measured at Cathode 0f D34)
ToPDP
ToPDP
Logic fromControl PCB
42PC5DC Y-SUS Block Diagram with IPM
Plasma Display Panel Troubleshooting – Spring 2008 34
Normal Waveform
Panel Waveform Adjustment
RAMP UP
-VY
V SET DOWN
Oscilloscope TP Y Drive Board
-VY TP
120 +/- 5µs
305 +/- 1VFlat Section 0µs
42PC5DC Y-SUS Waveform Adjust
Plasma Display Panel Troubleshooting – Spring 2008 35
The center begins to wash out and arc due to -VYrunning to long and clipping.
Colors and the image will bloom slightly and the unitwill have difficulty with clean frame changes in a quicklyaltering image.
-VY Normal -145
Rotated Fully CCW -138V
Rotated Fully CW -166
42PC5DC Y-SUS -Vy Too High or Low
Plasma Display Panel Troubleshooting – Spring 2008 36
All of the center washes out due to increased Vset_DN time.
The center begins to wash out and arc due to decreased Vset DN time.
V SET DOWN Rotated Fully CCW
V SET DOWN Rotated Fully CW
42PC5DC Y-SUS Ramp Down Too High or Low
Plasma Display Panel Troubleshooting – Spring 2008 37
Noticeable low level color distortion with the Ramp_up too high.
Noticeable low level color distortion with the Ramp_up too low.
RAMP UP Rotated Fully CCW
RAMP UP Rotated Fully CW
42PC5DC Y-SUS Ramp Up Too High or Low
Plasma Display Panel Troubleshooting – Spring 2008 38
Generates -Vy from Vs by transformer
Control Board
Diagram of Y Sustain Board
IPM Generates Sustain Waveform
Troubleshooting
Distributes 5v VA VS Distributes 5v
Logic signals needed to
generate drive waveform
Y/Z ER IPM Current Monitor Receive 5V,Va, Vs
from SMPS
Transfer Waveformto Y Drive Board
Z SUS Board
Display Panel
Power Supply Board - SMPS
FETs amplify Sustain Waveform
42PC5DC Y-SUS Block Diagram
Plasma Display Panel Troubleshooting – Spring 2008 39
There is one IPM ( Intelligent Power Module) on the Y Sustain Board both the SUS and ER Functions are all controlled by IC13
SUS_DNSUS_DN
SUS_UP
ER_UP ER_DN
Troubleshooting
IPM Intelligent Power Module
42PC5DC Y-SUS IPM Explained
Plasma Display Panel Troubleshooting – Spring 2008 40
Y_SUS Z_SUS
GND
CP
Panel
Vzb
ER_COM
SUS_OUT
SUS_UP
Vs
-Vy
ER_UP
ER_DN
SUS_UP
SUS_DN
Ramp
PASS_TOP
SET_DN
SUS_DN
SUS_OUT
ER_UP
ER_DN
SUS_UP
SUS_DNZBIAS
Vs
Vzb
SCAN
GND
GND GND
ER_COM
GND
Vsc
Troubleshooting
IPMs control both Y and Z Board ER Up Down and SUS Up Down functions used to Drive the Display Panel
42PC5DC Y-SUS and Z-SUS Panel Drive Output Circuits
Plasma Display Panel Troubleshooting – Spring 2008 41
Troubleshooting
How to Check IPMs “ Diode Check”, Board Removed from Set
Test Points referenced from the silk screenfound on the bottom of the PC Board.
SUS_OUT VS .804
VS SUS_OUT ∞
SUS_OUT YER .395
YER SUS_OUT ∞
YER VS .410
YERVS ∞
GND VS .539
VS GND ∞
SUS_OUT GND ∞
GND SUS_OUT ∞
IC13
42PC5DC Y-SUS Testing IPMs
Plasma Display Panel Troubleshooting – Spring 2008 42
Y-Drive Board works as a path supplying the Sustain and Reset waveforms which are made in the Y SUSTAIN B/D and sent to the Panel through SCAN DRIVER IC’s.
The Y Drive Board supplies a waveform which selects the horizontal electrodes sequentially.
* 42PC5DC uses 10 DRIVER ICs on 1 Board.
Troubleshooting
Y DRIVE WAVEFORM
42PC5DC Y-DRIVE SECTION
Plasma Display Panel Troubleshooting – Spring 2008 43
Troubleshooting
To remove the Ribbon Cable from the connector first carefully lift the Locking Tab from the back and tilt it forward ( lift from the outside edge as shown in Fig 1). Gently slide the Ribbon Cable free from the connector.
Fig 1
To reinstall the Ribbon Cable carefully slide it back into the slot see ( Fig 2 ), be sure it is seated securely and press the Locking Tab back to the locked position see ( Fig 3).
Fig 2 Fig 3
P11 P9
P1 P2 P3 P4 P5 P6 P7 P8
42PC5DC Y-Drive Connectors to the Panel
Plasma Display Panel Troubleshooting – Spring 2008 44
Troubleshooting
Use Diode test as shown below to test Connector P11 Y-DRIVE Board.
12
3
45
6
1
2
3
4
5
6
∞
∞
∞∞
∞
∞
42PC5DC Testing The Y-Drive Buffer Inputs P11 Using Red Lead
Plasma Display Panel Troubleshooting – Spring 2008 45
Troubleshooting
Use Diode test as shown below to test Connector P11 Y-DRIVE Board.
12
3
45
6
1
2
3
4
5
6
.485
1.01
∞∞
.406
.661
42PC5DC Testing The Y-Drive Buffer Inputs P11 Using Black Lead
Plasma Display Panel Troubleshooting – Spring 2008 46
42PC5DC Testing The Y-Drive Buffer Inputs Red Lead Troubleshooting
.41 2
3
4
5
6
78
9
10
Use Diode test as shown below to test P9 Connector on the Y-DRIVE Board.
1
2
3
4
5
7
8
9
10
6
.402
.616
.498
.493
.498
.498
∞
∞
∞11
11 .482
Plasma Display Panel Troubleshooting – Spring 2008 47
Troubleshooting
1 23
4
5
6
78
9
10
Use Diode test as shown below to test the Y-DRIVE Board.Reverse Bias test method is shown below
1
2
3
4
5
7
8
9
10
6
∞
∞
∞
2.36
∞
∞
∞
∞
∞
∞
11 .08
42PC5DC Testing The Y-Drive Buffer Inputs Black Lead
Plasma Display Panel Troubleshooting – Spring 2008 48
Y-DRIVE Scan IC Testing
Horizontal ElectrodeScan IC Test Points (-)
Scan IC's can be tested to identify a defectiveScan IC. Use forward reverse bias diode test to checkeach IC to confirm the board is defective.
Troubleshooting
Horizontal ElectrodeScan IC Test Points (+)
.759
42PC5DC Testing The Y-Drive Buffer Outputs
Plasma Display Panel Troubleshooting – Spring 2008 49
• DC Voltage and Waveform Test Points• Z BIAS Alignment• Resistance Test Points
Operating Voltages
Y SUS Supplied VA VS 5v VCC
Developed on Z SUS Z Bias IPM 18v
Troubleshooting
This Section of the Presentation will cover troubleshooting the Z-SUS Board Assembly. Upon completion of this section the Technician will have a better
understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting and alignment.
42PC5DC Z-SUSTAIN SECTION
Plasma Display Panel Troubleshooting – Spring 2008 50
Troubleshooting
Z BIAS Adjustment
P3 P2
P4
P5 P6 P1
IC9
Z BIASTest Point
42PC5DC Z-SUS Board Identification
Plasma Display Panel Troubleshooting – Spring 2008 51
Z Sustain Board provides the SUSTAIN and ERASE PULSES for generating SUSTAIN discharge in the panel by receiving LOGIC signals from the CONTROL B/D.
The Drive Waveform is supplied to the panel through Z FPC (Flexible Printed Circuit) (Z).
Troubleshooting
Z DRIVE WAVEFORM
Vzb Voltage
42PC5DC Z-SUS Board Waveform TP
Plasma Display Panel Troubleshooting – Spring 2008 52
Z Bias Adjust
Z Bias Test Points
Scope Test Point
Troubleshooting
Model : PDP 42 X 4A ### All Voltage : DC 5.0VVa : 60 Vs : 190N.A / 145 / N/A / N.A / 150Max Watt : 330 W ( Full White )
42PC5DC Z-SUS Board Layout
Plasma Display Panel Troubleshooting – Spring 2008 53
Troubleshooting
To PDP
IPM18V
P12
P6
P5
P4
P2
FL7
P3
IPM
IC9VS
VA
5V
To PDP
ZER
L1
VS
ZER
FS1Logic from
Control PCB
5 V
SUS OUT
Z Bias
Block
Q1Q2
18V
42PC5DC Z-SUS Board Block Diagram
Plasma Display Panel Troubleshooting – Spring 2008 54
Troubleshooting
Y Drive Waveform Y Drive Waveform
Z Drive Waveform Z Drive Waveform
Troubleshooting a no picture (no raster) symptom can sometimes be made easier by checking the Y and Z Drive Waveforms. The illustration above shows both waveforms at 100 and 400μs time durations. Since both waveforms are developed independently of each other, checking them will reveal which circuit has failed. Make note of the wave shapes and phase relationship of the signals, distortion or loss of the signals when recognized will speed up the troubleshooting process and prevent the need to replace circuit boards which are working normally.
42PC5DC Y-SUS and Z-SUS Drive Waveform Summary
Plasma Display Panel Troubleshooting – Spring 2008 55
• DC Voltage and Waveform Test Points• Resistance Test Points
Operating Voltages
Y SUS Supplied 5V VCC
Developed on the 1.8V
Control board (2) 3.3V
Troubleshooting
Main Board Supplied LVDS Signal
Logic Signals
This Section of the Presentation will cover troubleshooting the Control Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to
locate voltage and resistance test points needed for troubleshooting.
42PC5DC CONTROL BOARD SECTION
Plasma Display Panel Troubleshooting – Spring 2008 56
Troubleshooting
MCM IC
50Mhz
P2
P7 P8
P3
Check the output of the Oscillator package. The frequency of the sine wave is 50 MHZ.Missing this clock signal can halt operation of the unit
AUTO GENInternal Pattern Generator
Panel Test: Remove the LVDS Cable. Short the Auto Generator.
Patterns should appear on the Screen.
The Panel Test is a good way to tell if the Panel or the Main board is the problem.Don’t forget to also investigate the LVDS cable as a source of Video problems.
42PC5DC Control Board Layout and Auto Gen. Panel Test
Plasma Display Panel Troubleshooting – Spring 2008 57
Troubleshooting
IC13LGDP4006
MCM
P7 P8
P1
LVDS
P3
P2
IC4
IC5
Temp Diodes
Logic Signals to the
Y SUS Board
Logic Signals to the
Z SUS Board
RGB Logic Signals to the
Left X Board
RGB Logic Signals to the
Right X Board
IC25
D4D3D2D1
Download
P6
X1
3.3V3.3V
1.8V
Look for activity at the Temp Diodes if not lit check supplies. Supplies present replace the Control Board
42PC5DC Control Board Drawing
Plasma Display Panel Troubleshooting – Spring 2008 58
Troubleshooting
LVDSVideo Signals from the Main Board to the Control Board are referred to as Low Voltage Differential Signals or LVDS. Their presence can be confirmed with the Oscilloscope by monitoring the LVDS signals with no input signal selected while pressing the Menu Button “on” and “off” with the Remote Control or Keypad. Loss of these Signals would confirm the failure is on the Main Board!
Example of Normal Signals measured at 200mv/cm at 5µs/cm.
Menu Off Menu ON
LVDS Cable
42PC5DC Control Board LVDS Signal Information
Plasma Display Panel Troubleshooting – Spring 2008 59
MCM
TCP TCPTCP
16 line
Resistor Array
192 Lines output
Diagram of Control Board Control Board to X Board Address Signal Flow
16 line
LGDP4006This Picture shows Signal Flow Distribution to help determine the failure depending on where the it shows on the screen.
The Control Board supplies Video Signals to the X Boards, which then drive the TCP ICs. A bar defect on the screen, could be a Control Board problem.
Troubleshooting42PC5DC Control Board to X-Board Signal Information
Plasma Display Panel Troubleshooting – Spring 2008 60
Troubleshooting
Right X Drive Board
P107
P108 P114
P109
Right X Board
TCP IC
Left X Board
There are 2 X Drive Boards used in the 42PC5DC. Each board drives 6 TCP IC’s which are used for developing the Vertical Grid.
42PC5DC X-DRIVE BOARD SECTION
Plasma Display Panel Troubleshooting – Spring 2008 61
TCP IC
Front side
TCP ICs supply RGB 16 bit signal to the PDP by connecting the PAD Electrode of the PANEL with the X Board.
TCP
Connector
Fram
e X_B/D
Front panel
Rear panel
Troubleshooting42PC5DC TCP (Tape Carrier Package)
Plasma Display Panel Troubleshooting – Spring 2008 62
1 50
VA (7,8,9) 15 Thru 2526-29
Grnd
30 Thru 36
45,46
NC
VA (42,43,44)
37 Thru 39 GrndRGB Logic Signals RGB Logic Signals
VA
2,3,4Ground
5,6NC
10,11NC
12,13,14Ground
40, 41NC
47,48,49 Ground
VA
NC NC
42PC5DC FPC Output to TCP IC
TCP (Taped Carrier Package) Connector Information
Plasma Display Panel Troubleshooting – Spring 2008 63
Operating Voltages SMPS Supplied
Troubleshooting
This Section of the Presentation will cover troubleshooting the Main Board. Upon completion of the Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments.
9V
2.5V
19V12V6V3.4V
Developed on the Main Board 3.3V (2)
5V
42PC5DC MAIN BOARD SECTION
DC Voltage and Waveform ChecksResistance Measurements
Plasma Display Panel Troubleshooting – Spring 2008 64
Troubleshooting
Tuner IC1001
A/V Component Inputs
A/V Composite inputs
RS 232HDMI
Cable/ Antenna
Speakers P7009 P7010
No Fan in 42”
LVDS P6001
PC
P4004 P4005 P4003
USB
Audio Output IC7017
IC4015 Micro Controller
AV2 Input
Keyboard InputP4007
P5002
42PC5DC Main Board Layout
Plasma Display Panel Troubleshooting – Spring 2008 65
Troubleshooting
Tuner
IC4003
IC401612V0V9V
0V3.3V
5V
IC4013IC4008
P4007P5002
Input Jacks
IC4008
3.4V Input
3.3V Control
0V
1.1V
2.5V Output
IC4013
6V Input
3.2V Control
5V Output
0V
0VAudio Output
IC7017
IC4011
4.9V 3.3V
P4004 P4005 P4003 P6001
LVDS
IC1001
BCM3550
MST3361
IC7004
D4006
P7009
P7010
MTV416GMFIC4015
IC5003 CXA2069Q
P7002
RF INPUT
42PC5DC Main Board Drawing
Plasma Display Panel Troubleshooting – Spring 2008 66
42PC5DC BLOCK DIAGRAM SECTION
See the following pages for Block Diagrams
Plasma Display Panel Troubleshooting – Spring 2008 67
MST3361
Side AV V,LR
Rear AV V, LRRear S YC, LR
Side S YC, LRMNT_V_Out
IN1
OUT1IN4IN1
IN4
IN5
OUT3
Comp_1YCbCrComp_2YCbCr
IN3IN4
CV
BS
CVBS
ATSC/NTSC Tuner
CableANT.
64-Bit I/F
BCM3550IC1001
12LVDSTransVDEC_CVBS/S_Y
VSB/QAM/NTSC/SIF
SPDIF Out
R/L Output
SPDIF_OUT
Flash Memory16MByte
HDMI/DVI
RS-232C
SDRAM256Mbit X-tal
54MHz
Reset IC
D-class AMP
Sub Micom(MTV416)
Sub Micom(MTV416)
EEPROM
HDMI & ComponentRGB-PC
Audio 부
Tuner부
Comp_1 LRComp_2 LRRGB(Phone) LR AUDIO
ADCAudio R/L I2S
I2S Audio Input
R/G/BH/V Sync
DVI Input
Digital Output.
SDRAM256Mbit x2
DDS
Data [24] Hsync/Vsync/DE/Clk2X1
S/W
2X1S/W
HDCP
IIC
TMDS
DDS
SPDIF
Y,C
IF P/N for DTVSIF for NTSC
SIF for NTSC
USB for upgrade S/W
LRMNT_OutAUDIO DAC
IIS
TMDS
CXA2069(AV S/W)
Troubleshooting
IC6004
IC7004
THC63LVD
IC4015
42PC5DC Block diagram Analog and Digital Inputs
Plasma Display Panel Troubleshooting – Spring 2008 68
42PC5DC Video signal path for Composite/S-video/IF
MNT_V_Out
SD_CVBSCXA2069
IC5003
OUT3
Side AV V,LR
Rear AV V, LR
Rear S YC, LR
Side S YC, LR
IN1
IN4
IN1
IN4
IN3
IN4
Comp_1 LR
Comp_2 LR
RGB(Phone) LR
BCM3550
SD_Y
SD_C
ANT/ Cable
TV IN
CVBS from TUNER
FMS6400
Y/CVBS
C
OUT1/Y
OUT1/C
M_CVBS/Y
C
M_CVBS
C
Y
LPF for CVBS
SD_CVBS
TUNER
IF_P
IF_N
IF_P from TUNER for DTV
IF_N from TUNER for DTV
Troubleshooting
Plasma Display Panel Troubleshooting – Spring 2008 69
IC7004BCM3550
GPIOGPIO for Interrupt
HD-DVIData [0: 23]
H sync/V sync/DE/Clock H,V Sync/Clock
GPIO
GPIO for Power detectionGPIO
GPIO for Hot plug detection
IC1001
MST3361
TMDS1 RX0+/-TMDS1 RX1+/-TMDS1 RX2+/-TMDS1 RX3+/-
DDC SDA1
DDC SCL1EEPROMFor EDID
DDC SDA1
DDC SCL1
TMDS1INPUT
DDC1INPUT
TMDS2 RX0+/-TMDS2 RX1+/-TMDS2 RX2+/-TMDS2 RX3+/-
DDC SDA2
DDC SCL2EEPROMFor EDID
DDC SDA2
DDC SCL2
TMDS2INPUT
DDC2INPUT
HDCP SDA
HDCP SCLEEPROMFor HDCP
NDA
NCL
INT
DATA_OUT
H,V Sync/DE/Clock
HDMI 1
HDMI 2
Troubleshooting42PC5DC Video signal path for HDMI Inputs
Plasma Display Panel Troubleshooting – Spring 2008 70
SIF from TUNER
CXA2069
Side AV V,LR
Rear AV V, LRRear S YC, LR
Side S YC, LR
IN1
IN4IN1
IN4
IN3
IN4Comp_1 LR
Comp_2 LRRGB(Phone) LR
OUT1/R
OUT1/L
ANT/ Cable
TUNER
AUDIO ADC(CS5331)
Audio R I2S_SCK_IN
Audio L
BCM3550
SIF
I2S_LRCH_IN
I2S_LRCK_IN
I2S_SCK_IN
I2S_LRCH_IN
I2S_LRCK_IN
SPDIF_IN_P SPDIF from MST3361
_RMNT_OutAUDIO DAC
(CS4344)
I2S_SCK_OUT
I2S_LRCH_OUT
I2S_LRCK_OUT
I2S_SCK_OUT
I2S_LRCH_OUT
I2S_LRCK_OUT
_LMNT_Out
Analog L_OUTAudioAMP
(TPA3100)
SPDIF Out SPDIF_OUT_P
AUD_LEFT_P
AUD_LEFT_N
AUD_RIGHT_N
AUD_RIGHT_P
SPK_L_P
SPK_L_N
SPK_R_N
SPK_R_P
Analog R_OUT
MC3307(OP-AMP)
IF_P from TUNER for DTV
IF_N from TUNER for DTVIF_PIF_N
Troubleshooting42PC5DC Audio signal path Block Diagram
Plasma Display Panel Troubleshooting – Spring 2008 71
42PC5DC FLOWCHART SECTION
(1) Check and see if LED’s are lit on the CTRL B/D. Missing check for 5VDC No Reset Occurs and no waveformspresent to drive the display panel! Check M5V_ON going high on the SMPS Board.
(5) Check LVDS cable from Main to CTRL B/D, Use the oscilloscope check for LVDS waveforms while pressing the menu button on and off.
(2) Check for VS, VA from SMPS. Missing check Resistances, look for possible shorts on the Y and Z SUS Boards. Check VS ON, going high on the SMPS Board from the Main Board. No Reset Occurs.
(3) Check Waveforms at TP Y Driver, and FL2 Z SUS, if missing or distorted check on the Power Supply for VS, Y SUS BD for V Set Down, -VY and Ramp Up, Z SUS BD Z Bias, 18V IPM’s Both Y&Z Boards No Reset
(6) Check VA to the X Boards Reset Occurs
(4) Examine Scan IC’s on Y Drive Boards use Diode Check No Reset
Flowchart No Picture Sound OK Look for Reset
“No raster” in details
- 72 -
TROUBLESHOOTING GUIDE
TV/CATV doesn’t display
Check TU4001 Pin9(Video output)Can you see the normal signal?
Check the input(Pin63) of AV switch(IC5003).Can you see the normal waveform?
Check the output(Pin56) of AV switch(IC5003).Can you see the normal waveform?
Check the input(Pin1) of LPF(IC4006).Can you see the normal waveform?
YES
YES
YES
NO Could you measure voltage of TU4001 & IIClines?
Are they all normal?
Check the output(Pin8) of LPF(IC4006).Can you see the normal waveform?
YES
Check the input(PinH26) of BCM3550(IC4006).Measure waveform at C1010 because it s more
easy to check.Can you see the normal waveform?
YES
YES
NO You should check power line& IIC lines.
YES
You should replace TUNER.
NO After checking the Power of AV switch you shoulddecide to replace AV switch or not.
NO After checking the Power of AV switch you shoulddecide to replace AV switch or not.
NO After checking the Power of LPF you should decide toreplace LPF or not.
NO After checking the Power of LPF you should decide toreplace LPF or not.
This board has big problem because Mainchip(BCM3550) have some troubles.
After checking thoroughly all path once again, Youshould decide to replace BCM3550 or not.
- 73 -
TROUBLESHOOTING GUIDE
Video doesn’t display
Check J5007 Pin3CCan you see the normal waveform?
Check the input(Pin1 or Pin8) of AVswitch(IC5003). Pin1 is for video1,Pin8 is for
video 2.Can you see the normal waveform?
Check the output(Pin56) of AV switch(IC5003).Can you see the normal waveform?
Check the input(Pin1) of LPF(IC4006).Can you see the normal waveform?
YES
YES
YES
NOJ5007 may have problem. Replace this Jack.
Check the output(Pin8) of LPF(IC4006).Can you see the normal waveform?
YES
Check the input(PinH26) of BCM3550(IC4006).Measure waveform at C1010 because it s more
easy to check.Can you see the normal waveform?
YES
YES
NO After checking the Power of AV switch you shoulddecide to replace AV switch or not.
NO After checking the Power of AV switch you shoulddecide to replace AV switch or not.
NO After checking the Power of LPF you should decide toreplace LPF or not.
NO After checking the Power of LPF you should decide toreplace LPF or not.
This board has big problem because Mainchip(BCM3550) have some troubles.
After checking thoroughly all path once again, Youshould decide to replace BCM3550 or not.
- 74 -
TROUBLESHOOTING GUIDE
Component doesn’t display
Check J5004,J5005.Can you see the normal waveform?
Check the input of Componentswitch(IC5001,IC5002).
Can you see the normal waveform?
Check the output of Componentswitch(IC5001,IC5002).
Can you see the normal waveform?
Check the input of MST3361(IC7004Pin41,44,46).
Can you see the normal waveform?
YES
YES
YES
NOJ5004,J5005 may have problem. Replace this Jack.
Check the output of MST3361(IC7004 ).Can you see the normal waveform?
YES
Check the input and output ofBCM3550(IC4006). Especially you should check
The H,V sync and clock.Can you see the normal waveform?
YES
YES
NO After checking the input TR of component, you shoulddecide to replace component switch or not.
NO
NO After checking the Power of MST3361 you shoulddecide to replace MST3361 or not.
NO
This board has big problem because Mainchip(BCM3550) have some troubles.
After checking thoroughly all path once again, Youshould decide to replace BCM3550 or not.
After checking the Power of component switch youshould decide to replace component switch or not.
After checking the Power of MST3361 you shoulddecide to replace MST3361 or not.
- 75 -
TROUBLESHOOTING GUIDE
RGB_PC doesn’t display
Check input connect P7004.Can you see the normal waveform?
Check the input of Component switch(IC5002).Can you see the normal waveform?
Check the output of Component switch(IC5002).Can you see the normal waveform?
Check the input of MST3361(IC7004Pin41,44,46).
Can you see the normal waveform?
YES
YES
YES
NOP7004 may have problem. Replace this Jack.
Check the output of MST3361(IC7004 ).Can you see the normal waveform?
YES
Check the input and output ofBCM3550(IC4006). Especially you should check
The H,V sync and clock.Can you see the normal waveform?
YES
YES
NO After checking the input TR of RGBHV, you shoulddecide to replace these components or not.
NO
NO After checking the Power of MST3361 you shoulddecide to replace MST3361 or not.
NO
This board has big problem because Mainchip(BCM3550) have some troubles.
After checking thoroughly all path once again, Youshould decide to replace BCM3550 or not.
After checking the Power of RGB switch you shoulddecide to replace component switch or not.
After checking the Power of MST3361 you shoulddecide to replace MST3361 or not.
Plasma Display Panel Troubleshooting – Spring 2008 76
Troubleshooting
The EndThank You
42PC5DC Conclusion Page