lg 42lh40 training manual
DESCRIPTION
Manual for trouble shooting the 42lh40 tvTRANSCRIPT
42LH40 Direct View LCD42LH40 Direct View LCD
1080PDirect View LCD
Published July 2009
Updated February 17, 2010
July 2009 LCD DV 42LH402
OUTLINEOUTLINE
• Main Board
Circuit Board Operation, Troubleshooting of :• Switch mode Power Supply/Ballast Combination
Section 1
Section 2
Contact Information, Preliminary Matters, Specifications,LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages
• Ft Control Board
• Side Keys
July 2009 LCD DV 42LH403
42LH40 LCD Direct View Display
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 which can save time and money sometimes can be overlooked. These techniques will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and Layout of the LCD 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 safely remove and replace any Circuit Board or Assembly.
Overview of Topics to be DiscussedOverview of Topics to be Discussed
July 2009 LCD DV 42LH404
IMPORTANT SAFETY NOTICEIMPORTANT 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.
CAUTIONCAUTION
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.
Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)
July 2009 LCD DV 42LH405
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.
Regulatory InformationRegulatory Information
This 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.
ESDESD NoticeNotice (Electrostatic Static Discharge)(Electrostatic Static Discharge)
July 2009 LCD DV 42LH406
New Training Materials on New Training Materials on the Learning Academy sitethe Learning Academy site
Customer Service (and Part Sales) (800) 243-0000
Technical Support (and Part Sales) (800) 847-7597
USA Website (GCSC) aic.lgservice.com
Customer Service Website us.lgservice.com
LG Web Training lge.webex.com
LG CS Academy lgcsacademy.com
Published July 2009 by LG Technical Support and TrainingLG Electronics Alabama, Inc.
201 James Record Road, Huntsville, AL, 35813.
http://136.166.4.200LG Learning Academy
32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG90, 47LH8542PG20, 42PQ20, 50PQ30, 50PG20, 50PS80, 50PS60
LCD-DV:PLASMA:
Also available on Also available on the Plasma pagethe Plasma page
Plasma PanelAlignment Handbook
LG CONTACT INFORMATIONLG CONTACT INFORMATION
July 2009 LCD DV 42LH407
Safety and Handling Regulations
1. Approximately 20 minute pre-run time is required before any adjustments are performed. 2. Refer to the Voltage Sticker on the Switch Mode Power Supply silk screening. (+/- ½ volt). 3. Be cautious of electric shock from the Backlight section, it uses high voltage AC. 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 sensitive to static electricity. Use caution when dealing with these IC and circuits.
5. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.
6. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.
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: Oscillator failure dead set, etc…
Checking Points to be Considered
SECTION 1: LCD DIRECT VIEW OVERVIEWSECTION 1: LCD DIRECT VIEW OVERVIEW
July 2009 LCD DV 42LH408
Basic Troubleshooting StepsBasic Troubleshooting Steps
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. Observation of the front Power LED may give some clues.
•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.
July 2009 LCD DV 42LH409
This section of the manual will discuss the specifications of the 42LH40LCD Direct View Display Panel.
42LH40 Product Information42LH40 Product Information
July 2009 LCD DV 42LH4010
Basic SpecificationsBasic Specifications
Key Features• Full HD 1080p HD Resolution• 70,000:1 Dynamic Contrast Ratio • TruMotion 120Hz• Intelligent Sensor Mode• 2.7ms Response Time (GTG)• 500 cd/m2 Brightness• Wide Color Gamut• Super IPS Panel• Wide Viewing Angle• XD Engine®• 24p Real Cinema• ISFccc® Ready• Picture Wizard• AV Mode II (Cinema, Sports, Game)• 60,000 Hour Panel Life (typical)• NTSC/ATSC Tuners with Clear QAM
Basic Specifications (LOGO Familiarization)Basic Specifications (LOGO Familiarization)
Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture.
July 2009 LCD DV 42LH4011
July 2009 LCD DV 42LH4012
FULL HD 1080p HD Resolution Pixels: 1920 (H) × 1080 (V)High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.
Pixel Count to Resolution ComparisonsPixel Count to Resolution Comparisons
FORMATS480I480P1080I720P1080P
InterlacedProgressiveInterlacedProgressiveProgressive
Interlaced2 Fields to make a Frame
ProgressiveEach Field is a Frame
Think of sync as the Panels “Refresh Rate”
240 Lines480 Lines540 Lines720 Lines1080 Lines
NTSCSDHDHDHD
Possible FrameRates:24FPS30FPS60FPS
1080P
BASICPIXEL COUNTS
720P Panel1365 (H) × 768 (V)
1080P Panel1920 (H) x 1080 (V)
July 2009 LCD DV 42LH4013
TOP PORTION
BOTTOM PORTIONRemote Control FamiliarizationRemote Control Familiarization
July 2009 LCD DV 42LH4014
Accessing the Service MenuAccessing the Service Menu
REMOTEBOTTOM PORTION
SIDE KEYS
To access the Service Menu.1) Turn the Set On2) Simultaneously, Press and
“Hold” the Menu Key on the Side Key pad and Press and “Hold” the Menu Key on the Remote approximately 5 seconds.
3) If Customer’s Menu appears, continue to hold until it disappears.
4) The Service Menu appears
Note: If a Password is required to enter the Service Menu. Enter;
0000
July 2009 LCD DV 42LH4015
Rear and Side Input JacksRear and Side Input Jacks
Rear In/Out Jacks
USB PortSoftware Upgrades
Music, Photos
Side In/Out
MAIN PWBRear and Side
Input/Output locations
Rear
Side
July 2009 LCD DV 42LH4016
1) Create an LG_DTV folder on the USB Flash Drive
2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file.
3) With TV turned on, insert USB flash drive.4) You can see the message
“TV Software Upgrade” (See figure to right)5) Cursor left and highlight "START" Button and
push “Enter” button using the remote control. 6) You can see the download progress Bar.7) Do not unplug until unit has automatically
restarted.8) When download is completed, you will see
“COMPLETE”. 9) Your TV will be restarted automatically.
USB DOWNLOADUSB DOWNLOAD
Shows the Currently Installed Version
Shows the Software Version
found on the USB Flash
Drive
Shows the Software file found on the USB Flash
Drive
* CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process.
7-7/8"200mm
25-13/16"655.3mm
40-13/16"1036.3mm
Remove 4 screws to remove stand for
wall mount
Model No.Serial No.
Label
16-1/8"410mm
22-13/16"580mm
28-3/8"721.4mm
Center
3-7/8"97.8mm
2-9/16"65.7mm
Weight without Stand: 36.4 lbWeight with Stand: 40.3 lb
WattageAverage: 143WStand By: less than 1W 3-1/2"
88.9mm
11-9/16"294mm
20-7/16"518mm
12-15/16"327.8mm
There must be at least 4 inches of Clearance on all sides
42LH40 Product Dimensions42LH40 Product Dimensions
12-15/16"327.8mm 8-7/8"
225.3mm
7-7/8"200mm
9-1/16"230mm
17
July 2009 LCD DV 42LH4018
Disassembly:This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42LH40 LCD Direct View Television.
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.
Troubleshooting:This section of the manual will also discuss troubleshooting.
Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems.
DISASSEMBLY AND TROUBLESHOOTING SECTIONDISASSEMBLY AND TROUBLESHOOTING SECTION
July 2009 LCD DV 42LH4019
Remove the 21 screws indicated.Pay attention to the size and type of screw
as there are many different types.Putting in an improper screw when reassembling may Cause damage.
The Stand does not need to be removed before removing the back.
Removing the Back Cover Removing the Back Cover
July 2009 LCD DV 42LH4020
Circuit Board LayoutCircuit Board Layout
POWER SUPPLYLVDS Cable
Ft IR/LED Control
AC Input
RFInput
Speaker R
Rear Inputs
MasterPower Switch
Side Keys
Speaker L
BacklightConnections
No T-CON or Ballast board
LVDS Cable
Main PWB
July 2009 LCD DV 42LH4021
POWER SUPPLY SECTIONPOWER SUPPLY SECTION
This switch mode power supply has the ballast section built in.The power supply develops Stand By 5V, 12V and 24V for the Main board.
This power supply draws a little less that 1 watt during stand by mode. The fuse F501 reads 157V (from hot ground) during this time. When the controller chip (on the back) receives the PWR-ON command via P201 Pin 19, the primary section increases its current supplying ability. The Primary fuse F501 now reads 380V. 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2. Internally, the power supply also sends B+ (390V) voltage to the Ballast section but it is not turned on at this time.When the power supply receives the INV-ON command via P201 pin 20, it is routed to the driver for the ballast (on the back of the board). The driver now starts to deliver drive information to the output FETs (on the far left hand heat sink) which in turn switch the primary sides of the two ballast transformers T703 and T704. They output 1.2Kv (48Khz) pulses to the backlights via P401 and P402.
July 2009 LCD DV 42LH4022
Power Power Supply PWB Supply PWB RemovalRemoval
Disconnect P201, P401, P402, AC In SK101 and SK102.
P201
AC InP401
P402
Press inTwo tabsto release
lock
P201
SK102
SK101
Remove the 6 screws indicated by the arrows w/screw.
There are three types of Main Power switch used in LG televisions. This set utilizes Type 1.
Type 1: Shuts off AC to the Power Supply.
Type 2:Opens ground to the front IR board. (Stand-By 5V Remains, the Main board stays alive).
This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high when ground opens. When the switch is closed, this same line called Power Key feeds back to the Microprocessor and the Micro. Turns on the Power.
Type 3: Opens ground to the front IR board. (Stand-By 5V turns off, the Main board is dead).
This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high when ground opens. This line feeds back to the Main board and from there it routes to the Power Supply. The high tells the Controller chip to turn off STBY-5V. When the switch is closed, this same line called Power Key now goes high and feeds back to the Power Supply and tells the controller chip to turn STBY-5V on.
Power Supply (Main Power Switch Type 1) LocationPower Supply (Main Power Switch Type 1) Location
OffOn
If the TV won’t come on, be sure to check the Main Power Switch before assuming a failure has occurred.
This switch breaks AC to the SMPS.
MAIN POWER SWITCH LOCATIONTYPE 1
(Bottom Right Side viewed from front)
July 2009 LCD DV 42LH4023
July 2009 LCD DV 42LH4021
POWER SUPPLY SECTIONPOWER SUPPLY SECTION
This switch mode power supply has the ballast section built in.The power supply develops Stand By 5V, 12V and 24V for the Main board.
This power supply draws a little less that 1 watt during stand by mode. The fuse F501 reads 157V (from hot ground) during this time. When the controller chip (on the back) receives the PWR-ON command via P201 Pin 19, the primary section increases its current supplying ability. The Primary fuse F501 now reads 380V. 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2. Internally, the power supply also sends B+ (390V) voltage to the Ballast section but it is not turned on at this time.When the power supply receives the INV-ON command via P201 pin 20, it is routed to the driver for the ballast (on the back of the board). The driver now starts to deliver drive information to the output FETs (on the far left hand heat sink) which in turn switch the primary sides of the two ballast transformers T703 and T704. They output 1.2Kv (48Khz) pulses to the backlights via P401 and P402.
AC In
Stand By 5V
Remote or KeyPower On
Resets Microprocessor
Main Board
MAIN PWB
5V Reg
PWR
12V VideoProcessing
InvOn
Microprocessor section of Mstar
IC100
12V/24V Regulators
Other Regs
StandBy 5V Reg1
2 5 66 8
2
5
42LH40 Power Supply Start Up Sequence42LH40 Power Supply Start Up Sequence
5
5
In Stand-By Primary side
is 178VIn Run
it is 380V
3
24V Audio
12V 24V
Power Det. Circuit
8
3.3V Regfor Micon
LVDS12V
12V
7
7
At point TV is in Stand-By state. Energy Star compliant.Less than 1 Watt
3
LVDS Panel Control
Inv On/Off
Other Circuits
A-DIMFixed
P-DIM
Other C
ircuits
9
9
Cust Menu for BacklightPicture Content
Intelligent Sensor feedback
BALLAST SECTION
Relay O
n (PWR
)
Power Supply will not be on if Main
Power Switch is off.
Ft Control
Master (Main)Power Sw
OnOff
POWER SUPPLY (SMPS)
+5VGeneral
L
L
8Inverter On
380VRegulator
6
Manipulates Backlights
Inverter OnStarts the Ballast
Drive Signal
Drive Sig
P-DIM
Backlights Light
10
4
Video
Blue LED lights to assist Backlight Lamp Firing
DC Up, Backlight brightness Up
7
11
12V LVDS
To Panel
25
TFT Driver Section Main PWB
BallastDriver FETs
1.2Kv
1.2Kv
64K
IC1100 TFT ControlerSectionTru-Motion
Video Processing section of
Mstar IC100Video
PWM-DIM (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.Manipulates the Backlight Brightness via the Video Processor Chip. Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range
42LH40 P700 on Main Board to SMPS P201 Turn On Circuit Diagram42LH40 P700 on Main Board to SMPS P201 Turn On Circuit Diagram
R189
R1851.2K
100
R714
R704
C711150pF
C1811uF
P700
12V12V
Gnd
Gnd
Gnd
Gnd
0V
3.38V
4.98V
1.8V
P201
ERR Out
PWR
A.DIMINV.On
PWM-DIM
n/c
SMPS
AB12
IC100Mstar
PWM2
PWM0
100Ω
n/c
GndGndGndGnd
Analog Dimming (Fixed Value)
100
H5
R245100
GPIO137SBY5V
MAIN PWB
5V
5V5V5V
GndGnd
12V
21
43
65
87
109
1112
1413
1615
1817
2019
2221
2324
21
43
65
87
109
1112
1413
1615
1817
2019
2221
2324
21.3V24V
GndGnd
GndGndGndGnd
n/c n/c
n/c n/c
E5 GPIO 134
L706
L70424V
C72168uF
C72768uF
L70712V
C72247uF
L701
R702
R257
G5R719 1KΩ
Q702
R713 0Ω
R717 3.3KΩ
GPIO 136R244 100Ω
+5V General
Power On
Inverter On/Off
3
1
2
6
5
8
7
Q706
+5VL715
+5V GeneralL709
LVDS 12V Panel PowerL728
Q703 R726 10KΩ
0.2V
6V
0.6V
4Q704Q705
LVDS Panel Control
R73222KΩ
0V0.6V
12VR739 47KΩ
R740 47KΩ
AB13
Digital Dimming (Variable)
C726220uF STBY5V
L700
R760
0L705
Relay On
A-DIM
P-DIM
STBY5V
4.7KC1821uF
C7251uF
C7061uF
21.3V
3.8V
10K
26
R708C745100uF
Q700Q701
L708
5.2V
n/c
n/c
INV ON/OFF
PWR ON
A-DIM
PWM-DIM
R201 100Ω
E8 GPIO 97Error Out Stby = 5V Run = 0V
Error 5V: Normal 0V:Lamps try to fire 4 time, if Error line is high, Micro
shuts off television.
July 2009 LCD DV 42LH4027
TEST 1 Power Supply PWB Low Voltage TestTEST 1 Power Supply PWB Low Voltage Test
AC Should not be applied at any time while adding resistors or while unplugging connectors as damage to the circuit PWB may occur.
a) The SMPS PWB “MUST” be producing STBY 5V on either pin 7, 8, 9 or 10 (5V).
If 5V Standby is not being generated, the SMPS PWB is defective andmust be replaced. There is no need to continue with the next test.
(b) Unplug P700 on the Main PWB.
TEST 1:
(1) Add a 100Ω resistor between (5V STBY) pin 7, 8, 9 or 10 and Pin 2 (PWR). Apply AC. This will turn on the power supply.a) Check that the 24V and 12V power supplies are
turned on, • P201 (24V pins 17 and 18) • P201 (12V pins 13 and 14)
(2) Remove AC power.Use P700
Side to insertresistors
July 2009 LCD DV 42LH4028
Continue if the 1st test was OK. Leave original resistor in place.
(3) Add another 100Ω resistor between (5V) pin 7, 8, 9 or 10 and Pin 20 (INV On).
(4) Apply AC Power. Simulating a Power and Backlight On command.
Backlights Normal:a) If normal, the backlights should turn on. SMPS OK.
Backlights Abnormal:a) Recheck all connections.b) Confirm the INV On/Off line pulling up to at least 3V.
REMOVE AC POWER:c) Check the connections to the Backlights.
DO NOT check these when AC is applied as they carry 1.2Kv each.Note, either of the connections are unplugged, the backlights will not light.
TEST 2 Power Supply PWB Backlights TestTEST 2 Power Supply PWB Backlights Test
P700 Connector disconnected from the Main PWB. Apply AC after adding jumper.
Use P700Side to insert
resistors
July 2009 LCD DV 42LH4029
General Backlight InformationGeneral Backlight Information
To Backlights Over 1.2KV
Currently, number of lamps “Unknown”
To Backlights Over 1.2KV
Ballast Section of SMPS
EEFL (External Electrode Fluorescent Lamp)LOW COST Large number of lamps driven by a single inverter
July 2009 LCD DV 42LH4030
Simple structure, Low price
Complicated structureSimple structure
Lamp manufacturing processLamp assembly structure
Low CostLarge number of Lamp Drive by single inverter
Introducing EEFL
July 2009 LCD DV 42LH4031
Introducing EEFL Contacts (Bulb Design)
Key: Long Life Time
• For CCFL, Hg gas is consumed mainly near the internal electrode• For EEFL, longer life time is expected because there is no internal electrode consuming Hg gas
Ballast Section of SMPS LayoutBallast Section of SMPS Layout
To BacklightsLeft Side T703
T704
Viewed from rear
To BacklightsRight Side
SMPS PWB
BacklightsTest PointBottom of
R406 or R40338V P/P
1.2Kv
48Khz
July 2009 LCD DV 42LH4032
42LH40 Ballast Control Signals Circuit Diagram42LH40 Ballast Control Signals Circuit Diagram
33
IC100Mstar
R743 100Ω
R7191KΩ
R704 4.7KΩ
A-DIM
PWM-DIM
INV On/Off3.8V
VBR-B (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.Manipulates the Backlight Brightness via the Video Processor. Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range
INV-On/Off
PWB-0AB12
AB13 PWM-2
20
24
21
R189 100Ω
R185 1.2KΩ
R244100Ω
G5
VBR-A (Analog Dimming)This line is not used.
P700POWER SUPPLY
RL-ON
PWR
4.89V2
12VReg
24VReg
13
14
17
18
390V
BALLAST SECTION
1.67V
IC301
380VReg
160VReg
ERR0V
22
P201MAIN PWB
20
24
21
2
13
14
17
18
22
IC600Ballast Control IC
12V
24V
On Back of PWB
On Back of PWB
INV O
n/Off
To Backlights1.2Kv
Two
Transformers
Drive C
ircuitFE
Ts Q709/10
Drive Control
Q702
R704 4.7KΩ
R7590Ω
R714100Ω
GPIO 134
GPIO 136
R237100Ω
Q701
Q700
R703R706
E5
7 8
9 10
7 8
9 10STBY5V
STBY5V
L700
L733
BallastPower
Hot GndP401
P402
Stand By 5VReg
Controller
R717 3.3KΩ
+5V General
GPIO 97
ERROR-Out
R201100Ω
E8
0V~130V
0V~130V
Varies with PDIM
390V
July 2009 LCD DV 42LH4034
Power Supply Backlight Drive Signal EffectsPower Supply Backlight Drive Signal Effects
PWMDIMmanipulates
the Burst Triangle
Oscillator in the ballast drive IC.
ADIM also manipulates
the Burst Triangle
OscillatorBut it is not
used.
Note:Backlights will attempt to fire 4
time. During these attempts, the Error
line will change from 5V to 0V.
0V when lamp tries to fire or is lit.
5V when the lamps are not lit.
After 4 attempts, if the Error Out line returns to 5V, this tells the Micro to turn the set off.
July 2009 LCD DV 42LH4035
Power Supply Connector P201 Voltage and ResistancePower Supply Connector P201 Voltage and Resistance
Diode Mode values taken with all Connectors Removed
1.19V4.98V0VPWR-ON2
GndGndGndGnd4
GndGndGndGnd6
2.85V5.14V5.14V5V8
2.85V5.14V5.14V5V10
GndGndGndGnd12
1.2V12.3V0V12V14
GndGndGndGnd16
0.81V21.4V0V24V18
2.25V3.8V0VINV.ON20
Open0V0VErr Out22
Open3.2V0V2PDIM24
Diode CheckRun STBYLabelPin
P201 Even "SMPS" to P700 "Main PWB"
ncncncnc1
GndGndGndGnd3
GndGndGndGnd5
2.85V5.14V5.14V5V7
2.85V5.14V5.14V5V9
GndGndGndGnd11
1.2V12.3V0V12V13
GndGndGndGnd15
0.81V21.4V0V24V17
ncncncnc19
Open1.66V0V1A.DIM21
ncncncnc23
Diode CheckRun STBYLabelPin
P201 Odd "SMPS" to P700 "Main PWB"
1ADIM Pin 21 Fixed and not used 2PDIM Pin 24 can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the Video Processor IC100.
July 2009 LCD DV 42LH4036
Power Supply Connector SK100 and SK101 Voltage and ResistancePower Supply Connector SK100 and SK101 Voltage and Resistance
Diode Mode values taken with all Connectors Removed
AC Voltage Readings Across Pins 1 and 2 for STBY and RUN.
OLN2
OL120Vac
L1
Diode CheckRun STBYLabelPin
AC Voltage Readings for either pin 1 or pin 2 in STBY and RUN with one lead on Neutral of SK100.
OLn/a2
OL120Vac
n/a1
Diode CheckRun STBYLabelPin
SK100 "SMPS" to AC IN SK101 "SMPS" to MASTER POWER SWITCH
SK101 SK100
Bottom Right of SMPS
Live
Neutral
With the Master Power SwitchClosed (On) AC flows.When Open (Off) AC open and does not flow.
F100
F1006.3A/250V
AC IN
July 2009 LCD DV 42LH4037
MAIN PWB SECTIONMAIN PWB SECTION
The Main PWB also contains the T-CON (TFT Driver) section. This set does not use a normal T-CON board.There are two LVDS cable feeds that go directly to the Panel. These carry the TruMotion 120Hz duel 12 bit LVDS, (video signal) that has already been prepared for the panel drivers.
The Main board receives its operational B+ from the Power Supply via P700.
STAND-BY• STBY 5V pins 7~10
The Main board also develops several B+ sources on the board. LVDS
• VCC-LCM+3.3V, • VDD-LCM+16V, • VGH+24V• VGHM+24V• VGL-5V
AUDIO• 3.3V• 1.8V
Mstar IC100 (Video) / MICROPROCESSOR• 1.2V, 1.26V, 1.8V, and 3.3V
RUN • 12V pins 13 and 14 • 24V pins 17 and 18.
TUNER and VSB CIRCUIT • 9V which is used to make 5V TU• 5V• 3.3V• 1.2V
July 2009 LCD DV 42LH4038
Removing the Main PWBRemoving the Main PWB Remove any tape holding down any cables.Remove the 6 screws indicated by the arrows.
P600
P1200
P700
Flip the locking tab upward, pull the LVDS ribbon out.
NOTE: Be sure to check on top and behind the Video Processor ICs. Look for a piece of
Chocolate(Heat Transfer Material).
Be sure to transfer to new PWB if present.
Disconnect P700, P1204, P600, P1400 and P1401.
P1400 P1401Press in on the top and bottom release
tabs to remove P700.
July 2009 LCD DV 42LH4039
Main PWB Main PWB LayoutLayout
MICRO and VIDEO PROCESSOR IC100 and Tru-Motion IC1100 run
Hot. This is normal.
1
19
P700To SMPS
P1400
P1200
X100
USB
TunerTU1001
P1400, P1401 to Panel
To Speakers SW100Reset
X1005
P600
LD1000 Tuner OK
when Green
LD1000
IC100
IC100Microprocessor
andVideo Processor
X1100
P1401
IC1100
To Ft Control PWB
To SMPS
July 2009 LCD DV 42LH4040
Main PWB (Front Side) Component LocationsMain PWB (Front Side) Component Locations
42LH40 Front Side Component Voltages
42LH40 MAIN (FRONT SIDE) SIMICONDUCTORS
IC701 1.8V DDR IC705 3.3V / 1.26V IC101 Flash Boot IC103 Reset IC707 5V EXT IC1001 3.3V FEPin Pin Pin Memory Pin Pin 1.8V MEMC Pin[1] n/c [1] 0.8V [1] 0V [1] Gnd [1] 0.8V [1] 4.9V[2] 3.2V [2] Gnd [2] 3.2V [2] 0V [2] Gnd [2] 4.9V[3] 3.2V [3] 5V [3] 2.5V [3] 3.3V [3] 4.9V [3] Gnd[4] n/c [4] 6.12V [4] Gnd [4] 6.5V [4] 3.36V[5] n/c [5] 4.99V [5] 0V Q105 Power On [5] 4.84V [5] 1.19V[6] 1.8V [6] 1.3V [6] 0V Pin Delay [6] 1.8V[7] 0.79V [7] 1.3V [7] 3.2V E Gnd [7] 1.8V IC1000 Flash Boot[8] Gnd [8] 3.19V [8] 3.2V B 0V [8] 4.83V Pin Memory
C 1.96V [1] 0VIC704 3.3V Reg Q706 5V General IC708 3.3V Reg IC601 1.8V Amp [2] 3.36V
Pin Pin LVDS 12V Pin Q106 Reset Pin [3] 3.36V[1] 0.79V [1] 5.1V [1] Gnd Pin [1] Gnd [4] n/c[2] Gnd [2] Gnd [2] 0.79V E Gnd [2] 1.8V [5] n/c[3] 5V [3] 12V [3] 1.26V B 0V [3] 3.3V [6] 1.19V[4] 7.7V [4] 0.67V [4] 1.26V C 3.3V [7] 0.79V[5] 4.9V [5] 12V [5] 1.8V [8] Gnd[6] 3.3V [6] 12V [6] 5V[7] 3.3V [7] 5V [7] 0V IC1002 5V for Tuner[8] 2.1V [8] 5V [8] 5V Pin
[1] 8.9VD1400 LVDS 16V D1401 LVDS (-5V) D1402 LVDS 3.3V D1204 LED Moving [2] 1.93V
Pin Source Pin Source Pin Source Pin Ft LED [3] 5VA 14.7V A (-5V) A Gnd A 0V [4] n/cJ 20V J (-2.38V) K 3.3V K 0.14V [5] GndK 27V K Gnd A 0V
41
July 2009 LCD DV 42LH4042
Main PWB Main PWB (Back View)(Back View)
42LH40 Front Side Component Voltages
42LH40 MAIN (BACK SIDE) SIMICONDUCTORS
Q1000 Tuner SIF IC1200 HDMI Q1202 Moving LED Q703 Turns on 5V IC104 EEPROM D1403 LVDS 16VPin Pin Pin Driver Pin General Q706 Pin Pin Source
E 2.4V [1] Gnd E 0.1V E 0V [1] Gnd A 12.2VC 0V [2] Gnd C 0V C 0V [2] Gnd K 16.6VB 3.0V [3] Gnd B 3.3V B 0.62V [3] Gnd
[4] Gnd [4] GndQ1001 Tuner Video [5] 4.8V IC1003 9V Reg Q704 Turns on [5] 3.25V
Pin analog [6] 4.8V Pin for Tuner Pin Q705 [6] 3.25V IC1203 SPDIF OpticE 2.5V [7] 4.8V [1] 12.3V E 0V [7] 0V PinC 0V [8] 4.8V [2] 8.9V C 0V [8] 3.25V [1] 3.25VB 3.2V [3] Gnd B 0.62V [2] 3.24V
IC1101 Flash IC1100 LD1100 Driver [3] GndIC1201 RS232 Pin Q600 Audio Mute Pin [4] 1.6V
Pin [1] 0V Pin Q705 Turns on LVDS G 0.29V [5] 3.25V[1] 3.3V [2] 1V E 0.1V Pin 12V Q706 D 2.9V[2] 5.6V [3] 3.26V C 3.2V E 0V S 0V D1100 LD1100 (Q1100)[3] 0V [4] Gnd B 0V C 0V Pin Gate[4] 0V [5] 0V B 0.66V A 0V[5] 5.5V [6] 0.1V Q701 PWR-On to IC107 Power Det K 0.33VV[6] 5.5V [7] 3.26V Pin P700 pin 2 IC105 HDCP EEPROM Pin Reset[7] 5.5V [8] 3.26V E 5.12V Pin [1] 0.0V[8] 0V C 4.99V [1] Gnd [2] 3.3V[9] 3.3V IC702 STBY 3.3V B 3.07V [2] Gnd [3] 3.2V D1223 B+ Routing
[10] 3.26V Pin Turned on by Q700 [3] 5.05V Pin RGB[11] 0V [1] Gnd [4] Gnd D102 Audio Mute A 5.1V[12] 3.3V [2] 3.3V Q702 INV-On to [5] 5.05V Pin Routing K 4.8V[13] 0V [3] 5.1V Pin P700 pin 20 [6] 5.05V A 0V A 0V[14] 5.6V E 0V [7] 3.25V K 0.1V[15] Gnd C 3.8V [8] 3.25V A 0V[16] 3.3V B 0V
41
July 2009 LCD DV 42LH4044
Main PWB X100, X1100 and X1005 Crystal CheckMain PWB X100, X1100 and X1005 Crystal Check
3.2Vp/p 12Mhz
Set on or off. Use bottom leg.
IC100 Microprocessor Crystal
MAIN PWB
Tuner Control IC1005 Crystal
4.95Vp/p 25Mhz
X100
X1100 Set on. Use bottom leg.2.4Vp/p 12Mhz
Set on. Use top leg.
TruMotion IC1100 Crystal
X1005
July 2009 LCD DV 42LH4045
Main PWB LD1000 FunctionMain PWB LD1000 Function
Main PWBLD1000 Location
LD1000
Use LD1000 as a visual aid.This lets you know if the tuner internal PLL
(Phase Locked Loop) system is locked. Illuminated PLL is normal. Off is abnormal tuner lock.
July 2009 LCD DV 42LH4046
Main PWB Tuner with Shield Off (Pin ID)Main PWB Tuner with Shield Off (Pin ID)
1
19
18
4
13
12
9
8
July 2009 LCD DV 42LH4047
Main PWB Tuner Video and SIF Output CheckMain PWB Tuner Video and SIF Output Check
450mVp/p
Pin 19 “Video”Signal
Pin 16 “SIF”Signal
2.24Vp/p
USING COLOR BAR SIGNAL INPUT
Pin 12 and Pin 13“Dig IF” Signal
Note:“Dig IF” Signal only when receiving a Digital Channel.
700mVp/p
Note: “Video Out” Signal only when receiving an analog Channel.
MAIN PWBTuner Location
July 2009 LCD DV 42LH4048
Main PWB Tuner Clock and Data LinesMain PWB Tuner Clock and Data Lines
Pin 8 SDA
100uS1V per/div 5V p/p
Pin 9 SCL
100uS1V per/div 5V p/p
Note:SCL and SDA only active during an actual Channel Change.
July 2009 LCD DV 42LH4050
Main Board LVDS Power Supply Voltage Generation CircuitMain Board LVDS Power Supply Voltage Generation Circuit
VCC3.3V
VGL-5V
VGHM26V
VDD16V
July 2009 LCD DV 42LH4049
Main PWB Connector P700 to Power Supply Voltage and ResistanceMain PWB Connector P700 to Power Supply Voltage and Resistance
Diode Mode values taken with all Connectors Removed
Open3.2V0V2PDIM24Open0V0VErr Out221.9V3.8V0VInv.Out20Open21.4V0V24V18GndGndGndGnd162.1V12.3V0V12V14GndGndGndGnd121.1V5.14V5.14V5V101.1V5.14V5.14V5V8GndGndGndGnd6GndGndGndGnd4
1.87V4.98V0VPWR-ON2
Diode CheckRun STBYLabelPin
ncncncnc232V1.7V0V1A.DIM21ncncncnc19
Open21.4V0V24V17GndGndGndGnd152.1V12.3V0V12V13GndGndGndGnd111.1V5.14V5.14V5V91.1V5.14V5.14V5V7GndGndGndGnd5GndGndGndGnd3ncncncnc1
Diode CheckRun STBYLabelPin
1ADIM Pin 21 Fixed and not used 2PDIM Pin 24 can vary according to type of signal being processed, OSD Backlight setting. 0.6V 0% to 3.3V 100% and the Intelligent Sensor. Output from the Video Processor IC100.
P700 “Main PWB" to P201 “SMPS PWB"Odd Pins Even Pins
July 2009 LCD DV 42LH4051
Main PWB Connector P1400 to the Panel Voltage and ResistanceMain PWB Connector P1400 to the Panel Voltage and ResistanceDiode Mode values taken with all Connectors RemovedP1400 CONNECTOR "Main" to “The Panel"
1.3V0VGSP_R20
Open0VH_CONV19
1.3V1.63VGSC18
1.3V0.6VGSP_R17
1.3V0.6VGOE16
GndGndGnd15
2.0V8.4VGMA914
2.0V10.3VGMA713
1.37V11.2VGMA612
2.0V12.3VGMA511
2.0V13.3VGMA410
1.36V14VGMA39
1.4V16VGMA28
2.0V14VGMA17
1.4V7VVCOM_L6
Open7VVCOM_FB5
Open26VVGH M4
GndGndGnd3
0.925V(-5V)VGL2
GndGndGnd1
Diode TestRunLabelPin
1.29V1.28VLMLV0N40
1.29V1.2VLMLV1P39
1.29V1.3VLMLV1N38
1.29V1.2VLMLV2P37
1.29V1.3VLMLV2N36
0.89V1.23VLMLV3P35
1.29V1.23VLMLV3N34
1.29V1.25VLMCLKP33
1.29V1.26VLMCLKN32
1.29V1.2VLMLV5P31
0.9V1.2VLMLV5N30
1.3V1.21VLMLV6P29
1.29V1.22VLMLV6N28
1.24V1.25VLMLV7P27
1.29V1.2VLMLV7N26
1.29V1.23VLMLV8P25
1.29V1.2VLMLV8N24
GndGndGnd23
1.45V0.2VSOE_L22
1.3V1.63VPOL21
Diode TestRunLabelPin
GndGndGnd60
Open8.2VLTD_L59
2.0V16VVDD58
2.0V16VVDD57
2.0V16VVDD56
GndGndGnd55
1.6V3.3VVCC54
1.6V3.3VVCC53
GndGndGnd52
2.0V2.3VGMA1851
1.39V0.3VGMA1750
2.0V2.3VGMA1649
2.0V3VGMA1548
1.4V4VGMA1447
2.0V5.2VGMA1346
2.0V6VGMA1245
1.4V7.9VGMA1044
1.3V3.24VOPT_N43
GndGndGnd42
0.89V1.2VLMLV0P41
Diode TestRunLabelPin
July 2009 LCD DV 42LH4052
Main PWB Connector P1401 to the Panel Voltage and ResistanceMain PWB Connector P1401 to the Panel Voltage and ResistanceDiode Mode values taken with all Connectors RemovedP1401 CONNECTOR "Main" to “The Panel"
1.3V1.6VGSC20
1.3V0VGSP_Rev19
1.3V0.6VGOE18
2.0V8.45VGMA917
2.0V10.4VGMA716
1.4V11.2VGMA615
2.0V12.3VGMA514
2.0V13.4VGMA413
1.36V14VGMA312
1.4V16VGMA211
2.0V14VGMA110
GndGndGnd9
1.6V3.3VVCC8
1.6V3.3VVCC7
GndGndGnd6
2.0V16.55VVDD5
2.0V16.55VVDD4
2.0V16.55VVDD3
Open8.9VLTD_R2
GndGndGnd1
Diode TestRunLabelPin
1.3V1.22VRMLV1N40
1.3V1.26VRMLV2P39
1.3V1.19VRMLV2N38
1.3V1.26VRMLV3P37
1.3V1.21VRMLV3N36
1.3V1.23VRMCLKP35
1.3V1.25VRMCLKN34
1.3V1.25VRMLV5P33
1.3V1.19VRMLV5N32
1.3V1.2VRMLV6P31
1.3V1.2VRMLV6N30
1.3V1.21VRMLV7P29
1.3V1.19VRMLV7N28
1.3V1.25VRMLV8P27
0.89V1.2VRMLV8N26
GndGndGnd25
1.5V0.2VSOE24
1.3V1.62VPOL23
1.3VOVGSP22
OpenOVH_CONV21
Diode TestRunLabelPin
GndGndGnd60
0.925V(-5V)VGL59
GndGndGnd58
Open26VVGH57
n/cn/cn/c56
2.0V7VVCOM_R55
2.0V2.3VGMA1854
1.4V1.3VGMA1753
1.4V2.3VGMA1652
2.0V3VGMA1551
1.4V4.86VGMA1450
1.5V5.18VGMA1349
2.0V6VGMA1248
1.4V7.93VGMA1047
0.9VOVOPT_P46
1.31V3.23VOPT_N45
GndGndGnd44
1.3V1.26VRMLOP43
1.3V1.20VRMLON42
1.3V1.25VRMLV1P41
Diode TestRunLabelPin
July 2009 LCD DV 42LH4053
Main PWB Connector P1204 to (Ft. IR/LED Control) Voltage and RMain PWB Connector P1204 to (Ft. IR/LED Control) Voltage and Resistanceesistance
Diode Mode values taken with all Connectors Removed
P1204 CONNECTOR "MAIN PWB" to P1 "Front IR / LED PWB Assy"
2.17V3.29V0VPOWER On/Off120.6V3.29V3.29V3.3V_ST11GndGndGndGnd10
Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd7
1.13V5.1V5.1V5V ST61.08V3.3V3.3VKey251.08V3.3V3.3VKey14GndGndGndGnd3
1.14V3.3V3.3VSDA21.14V3.3V3.3VSCL1
Diode CheckRun STBYLabelPin
July 2009 LCD DV 42LH4054
Main PWB Connector P600 to Speakers Voltage and ResistanceMain PWB Connector P600 to Speakers Voltage and Resistance
Diode Mode values taken with all Connectors Removed
SPK-L(+)SPK-L(-)SPK-R(+)SPK-R(-)
LABEL
1.5V10.7V0V41.5V10.7V0V31.5V10.7V0V21.5V10.7V0V1
Diode CheckRunSBYPin
P600 CONNECTOR "Main" to "Speakers"
Use speaker out to test for defective Audio Amp IC600
July 2009 LCD DV 42LH4055
FRONT CONTROL (IR and INTELLIGENT SENSOR) SECTIONFRONT CONTROL (IR and INTELLIGENT SENSOR) SECTION
The Front Control PWB (located on the bottom left as viewed from the rear) contains the IR (Infrared Remote Sensor) and the Intelligent Sensor plus the front Power LEDs.This board also connects with the Side Key PWB.
This board receives it operating B+ via pin 6 (STBY 5V) and pin 11 (STBY 3.3V) on connector P1. It is received from the Main PWB via the connector P1200.
The Intelligent Sensor communicates with the Video Processor IC100 via clock and data lines on the same connector pins 1 and 2.
The IR pulses (5V p/p) are sent to the Microprocessor (same IC100) via pin 9.
The Key board connector P3000 is routed to the Ft control board via P2. Then through the front Control board and out P2 to the Microprocessor via P1200 pins 4 and 5.
Finally, the front Power LEDs are controlled by pin 12 and pin 8.
July 2009 LCD DV 42LH4056
FRONT CONTROL BOARD CONNECTIONS IDENTIFIEDFRONT CONTROL BOARD CONNECTIONS IDENTIFIED
The below picture shows the connections to the Front Control board.
SideKey
P3000
P2P1
Main Power Switch
p/n EBR59216901
July 2009 LCD DV 42LH4057
FRONT CONTROL (IR and INTELLIGENT SENSOR) IDENTIFIEDFRONT CONTROL (IR and INTELLIGENT SENSOR) IDENTIFIED
The Front Control PWB (located on the bottom left as viewed from the rear) contains theIR (Infrared Remote Sensor) and the Intelligent Sensor plus the front Power LEDs.
Intelligent Sensor Infrared Sensor
LightDiffuser
Power LEDs
July 2009 LCD DV 42LH4058
Ft. IR / LED Control Connector P1 and P2 Voltage and Diode ChecFt. IR / LED Control Connector P1 and P2 Voltage and Diode Checkk
Diode Mode values taken with all Connectors Removed
P1 CONNECTOR "Front IR / LED PWB Assembly " to P1204 " MAIN PWB "
Open3.29V0VPOWEROn/Off12
Open3.29V3.29V3.3V_ST11GndGndGndGnd10Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd7
1.13V5.1V5.1V5V ST6Open3.3V3.3VKey25Open3.3V3.3VKey14GndGndGndGnd3Open3.3V3.3VSDA2Open3.3V3.3VSCL1
DiodeCheckRun STBYLabelPin
P2 Connector to “Side Key" P1
Gnd
Open
Gnd
Open
DiodeCheck
GndKey 2Gnd
Key 1
Label
GndGnd43.3V3.3V3GndGnd23.3V3.3V1
Run STBYPin
July 2009 LCD DV 42LH4059
Side Key AssemblySide Key Assembly
To Ft ControlP3000
SW3008
SW3007
SW3006
SW3005
SW3004
SW3003
SW3002
SW3001
P3000
July 2009 LCD DV 42LH4060
Side Key Assembly P3000 Voltage and Diode CheckSide Key Assembly P3000 Voltage and Diode CheckP3000 Resistance Measurements with Key pressed.
CH (Up)CH (Dn)
Volume (+)Volume (-)
KEY
10K Ohms4.8K Ohms1.8K Ohms270.5 Ohms
Pin 3 measured from Gnd
10K Ohms4.8K Ohms1.8K Ohms270.5 Ohms
Pin 1 measured from Gnd
EnterMenuInput
Power
KEY
P3000 Voltage Measurements with Key pressed.
CH (Up)CH (Dn)
Volume (+)Volume (-)
KEY
2.24V1.65V
0.906V0.179V
Pin 3 measured from Gnd
2.24V1.65V
0.906V0.179V
Pin 1 measured from Gnd
EnterMenuInput
Power
KEY
P3000 Connector “Side Key" to “IR/LED Control PWB“ P1
GndKey2GndKey1
Label
GndOpenGndOpen
Diode Check
GndGnd43.3V3.3V3GndGnd23.3V3.3V1
Run STBYPin
P3000
July 2009 LCD DV 42LH4061
Invisible Speaker System Overview (Full Range Speakers)Invisible Speaker System Overview (Full Range Speakers)
The 42LH40 contains the full progression of the Invisible Speaker system.First: The woofer layout is the basic system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports.
Tweeterp/n EAB58536001
Full Rangep/n EAB58534502
Tweeter(High Frequencies)
Main Speaker(Full Range Frequencies)
Magnet (Weight)Prevents vibrations
July 2009 LCD DV 42LH4062
Invisible Speaker System Overview (Tweeters)Invisible Speaker System Overview (Tweeters)
Invisible Speaker has a sticky surface which
adheres to front bezel.
Invisible Speaker Tweetershown separately. The Front (down) has sticky surface which adheres to
front bezel. Note, there is no diaphragm, only voice coil.
OutlinedCircle
SpeakerAttachment
post
Cabinet works as a diaphragm.
2nd: ProgressionElimination of the
conventional speaker.
The front bezel is shown below. Note: the outlined circle is the location for the front sticky pad on the
Invisible Speaker. This prevent the coil from bouncing off the plastic causing vibrations.
WARNING: Removing the Tweeter will destroy the speaker as shown above. The diaphragm/spider is glued to the
front bezel. When removing, it will tear.
Tweeterp/n EAB58536001
July 2009 LCD DV 42LH4063
Invisible Speaker System OverviewInvisible Speaker System Overview
Invisible SpeakerShown separately. Front (to left) has sticky surface
which adheres to front bezel. Note, there is no Cone (Diaphragm), only
voice coil.Spider
Dust Cap with
adhesive
Voice CoilInside
Magnet
Frequency Pass Capacitor
Mount
Mount
Speaker Wires
Speaker Terminals
July 2009 LCD DV 42LH4064
11 X 17 FOLDOUT SECTION11 X 17 FOLDOUT SECTION
This section shows the 11X17 foldout thatThis section shows the 11X17 foldout that’’s available in the Paper s available in the Paper and Adobe version of the Training Manual.and Adobe version of the Training Manual.
The Adobe version of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier.zoom in and out making reading of the small text easier.This Power Point shows a graphical representation of the 11 X 17This Power Point shows a graphical representation of the 11 X 17foldout page so clarity is limited.foldout page so clarity is limited.
42LH40 INTERCONNECT DIAGRAM
SMPS TEST 1: To Force Power Supply On.Disconnect P700 on Main PWB.Jump pin 7,8,9 or 10 (5V) to pin 2 using a 100Ωresistor. (Test Voltage Outputs 12V, and 24V).
SMPS TEST 2: Jump pin 2 to pin 20 (INV-ON).(Backlights and all voltages should turn on).
P1204 CONNECTOR "MAIN PWB" to J1 "Front IR / LED PWB
MAIN (Digital) Board
X10012 Mhz
Q706
LD1000
1
TUNER TU1001
SIF 16
Video 19
(5V) 4
DIF + 12DIF - 13(5V) 15
IC1100Video
ProcessorTru-Motion
Video ResetSW1100
Micro ResetSW100
X100525Mhz
IC704
IC2 X110012 Mhz
P1401 P1400L1301
L1300
D1402
IC705
L718IC706
P700
P1200
IC1300D1400
IC701
D1401
P600
L607
L606IC600
IC601
IC1002
Q105 Q106
IC103
IC502
IC501
D500
IC708
IC1000
IC101
IC1301
IC707L712Q100
IC1202
Q1200
D1204
IC1
L726
L710
IC300
IC301
P1100SoftwareUpgrades
N/C
IC10048vsb/QAM
IC1001
D1100
Q1100
IC102
LD1100
IC105
IC104
IC1201
IC1200
D1223
Q1001
Q1000
Q600
IC702
IC1003
Q1202D102
Q705 Q704Q701
Q703
Q702 D1403IC1101
IC1203
Components that are Grayed out are on the back.
P201 “SMPS" to P700 "Main PWB"
2PDIM Pin 24 can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the IC100.
P201
SK101AC IN
SK100
P401
P402
F100
3.15A/250VRun 380V
STBY 157VFrom Hot Gnd
F501
SMPSSwitch Mode Power Supply
F1006.3A/250V
AC IN
T704
T703
1.2KV
Main Power SWSide (Key) C
ontrols
P1
Front PWB Assembly
IR ReceiverIntelligent Sensor
P3000
P2
IC100Micro and
VideoProcessor
Mstar
Tuner
P2 "Front IR / LED PWB to P3000 Keys
1.2KV
TO TFT MODULE
Pin 2 (-5V)Pin 4 (26V)
Pin 56,57,58 (16V)Pin 53,54 (3.3V)
Pin 3,4,5 (16V)Pin 7,8 (3.3V)
Pin 59 (-5V)Pin 57 (26V)
Component Voltage on Next Page
1 ADIM Pin 21 Fixed and not used
GndKey2GndKey1
Label
GndOpenGndOpen
Diode Check
GndGnd43.3V3.3V3GndGnd23.3V3.3V1
Run STBYPin
Open3.29V0V120.76V3.29V3.3V_ST11GndGndGndGnd10Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd71.5V5.1V5.1V5V ST61.1V3.3V3.3VKey251.4V3.3V3.3VKey14GndGndGndGnd3
1.67V3.3V3.3VSDA2Open3.3V3.3VSCL1
Diode CheckRun STBYLabelPin
POWER On/Off3.29V
STBYLabel
ncncncnc1
Gnd
nc
Diode Check
GndGndGnd3,4,5,6
2.85V5.14V5.14V5V
GndGndGndGnd
1.2V12.3V0V12V
0.81V21.4V0V24V
ncncncnc19
Open1.66V0V1 A.DIM21
ncncnc23
Run STBYLabelPin
1.19V4.98V0VPWR-On2
2.25V3.8V0VINV.ON20
Open0V0VErr Out22
Open3.2V0V2 PDIM24
7,8,9,10
11,12
13,14GndGndGndGnd15,16
17,18
R406R403
R406 / R403Bottom leg
48Khz53V p/p
250V 82mF
250V 82mF
250V 82m
F
250V 82m
F
1 2
23 24 16V Pin 42 IC1300For Panel
26V Pin 8 IC1300For Panel
-5V Anode D1401For Panel
3.3V Top Side of L1301 For Panel
42LH40 MAIN (BACK SIDE) SIMICONDUCTORSQ1000 Tuner SIF IC1200 HDMI Q1202 Moving LED Q703 Turns on 5V IC104 EEPROM D1403 LVDS 16V D1100 LD1100 (Q1100) D1223 B+ Routing
Pin Pin Pin Driver Pin General Q706 Pin Pin Source Pin Gate Pin RGBE 2.4V [1] Gnd E 0.1V E 0V [1] Gnd A 12.2V A 0V A 5.1VC 0V [2] Gnd C 0V C 0V [2] Gnd K 16.6V K 0.33VV K 4.8VB 3.0V [3] Gnd B 3.3V B 0.62V [3] Gnd A 0V
[4] Gnd [4] GndQ1001 Tuner Video [5] 4.8V IC1003 9V Reg Q704 Turns on [5] 3.25V
Pin analog [6] 4.8V Pin for Tuner Pin Q705 [6] 3.25V IC1203 SPDIF OpticE 2.5V [7] 4.8V [1] 12.3V E 0V [7] 0V PinC 0V [8] 4.8V [2] 8.9V C 0V [8] 3.25V [1] 3.25VB 3.2V [3] Gnd B 0.62V [2] 3.24V
IC1101 Flash IC1100 LD1100 Driver [3] GndIC1201 RS232 Pin Q600 Audio Mute Pin [4] 1.6V
Pin [1] 0V Pin Q705 Turns on LVDS G 0.29V [5] 3.25V[1] 3.3V [2] 1V E 0.1V Pin 12V Q706 D 2.9V[2] 5.6V [3] 3.26V C 3.2V E 0V S 0V[3] 0V [4] Gnd B 0V C 0V[4] 0V [5] 0V B 0.66V[5] 5.5V [6] 0.1V Q701 PWR-On to IC107 Power Det[6] 5.5V [7] 3.26V Pin P700 pin 2 IC105 HDCP EEPROM Pin Reset[7] 5.5V [8] 3.26V E 5.12V Pin [1] 0.0V[8] 0V C 4.99V [1] Gnd [2] 3.3V[9] 3.3V IC702 STBY 3.3V B 3.07V [2] Gnd [3] 3.2V
[10] 3.26V Pin Turned on by Q700 [3] 5.05V[11] 0V [1] Gnd [4] Gnd D102 Audio Mute[12] 3.3V [2] 3.3V Q702 INV-On to [5] 5.05V Pin Routing[13] 0V [3] 5.1V Pin P700 pin 20 [6] 5.05V A 0V[14] 5.6V E 0V [7] 3.25V K 0.1V[15] Gnd C 3.8V [8] 3.25V A 0V[16] 3.3V B 0V
42LH40 MAIN (FRONT SIDE) SIMICONDUCTORSIC701 1.8V DDR IC705 3.3V / 1.26V IC101 Flash Boot IC103 Reset IC707 5V EXT IC1001 3.3V FE
Pin Pin Pin Memory Pin Pin 1.8V MEMC Pin[1] n/c [1] 0.8V [1] 0V [1] Gnd [1] 0.8V [1] 4.9V[2] 3.2V [2] Gnd [2] 3.2V [2] 0V [2] Gnd [2] 4.9V[3] 3.2V [3] 5V [3] 2.5V [3] 3.3V [3] 4.9V [3] Gnd[4] n/c [4] 6.12V [4] Gnd [4] 6.5V [4] 3.36V[5] n/c [5] 4.99V [5] 0V Q105 Power On [5] 4.84V [5] 1.19V[6] 1.8V [6] 1.3V [6] 0V Pin Delay [6] 1.8V[7] 0.79V [7] 1.3V [7] 3.2V E Gnd [7] 1.8V IC1000 Flash Boot[8] Gnd [8] 3.19V [8] 3.2V B 0V [8] 4.83V Pin Memory
C 1.96V [1] 0VIC704 3.3V Reg Q706 5V General IC708 3.3V Reg IC601 1.8V Amp [2] 3.36V
Pin Pin LVDS 12V Pin Q106 Reset Pin [3] 3.36V[1] 0.79V [1] 5.1V [1] Gnd Pin [1] Gnd [4] n/c[2] Gnd [2] Gnd [2] 0.79V E Gnd [2] 1.8V [5] n/c[3] 5V [3] 12V [3] 1.26V B 0V [3] 3.3V [6] 1.19V[4] 7.7V [4] 0.67V [4] 1.26V C 3.3V [7] 0.79V[5] 4.9V [5] 12V [5] 1.8V [8] Gnd[6] 3.3V [6] 12V [6] 5V[7] 3.3V [7] 5V [7] 0V IC1002 5V for Tuner[8] 2.1V [8] 5V [8] 5V Pin
[1] 8.9VD1400 LVDS 16V D1401 LVDS (-5V) D1402 LVDS 3.3V D1204 LED Moving [2] 1.93V
Pin Source Pin Source Pin Source Pin Ft LED [3] 5VA 14.7V A (-5V) A Gnd A 0V [4] n/cJ 20V J (-2.38V) K 3.3V K 0.14V [5] GndK 27V K Gnd A 0V
BC E
G
D
S
J
KA
42LH4042LH40Direct View LCD
This concludes the 42LH40training session.