Download - 04_trobleshooting_E.pdf
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4-1
4. Troubleshooting
4. Troubleshooting
4-1. First Checklist for TroubleshootingCheck the various cable connections first. - Check to see if there is a burnt or damaged cable. - Check to see if there is a disconnected cable connection or a connection is too loose. - Check to see if the cables are connected according to the connection diagram.
Check the power input to the Main Board.
Check the following circuits. No raster appears: Function PBA, Main PBA, I/P PBA 55V develop but no screen: Main PBA 5V does not develop: I/P PBA
Check the voltage in and out between the IP Main Board, between the IP Panel, and between the Main LVDS Boards.
1.
2.
3.
4.
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4-2
4. Troubleshooting
4-2. No Power
Symptom Though the power swtich on, the LED power off and the screen is blank.-
Major checkpoints
Check Power cable.Check whether the Lamp connector is connected correctly to the IP.Check whether the power cable is connected correctly to the MAIN. Check whether the Function cable is connected correctly to the MAIN.
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Diagnostics
IC1013
Main Board Front
IC1005
Yes
NoDoes Power indicator LED Off ? Check a connection a power cable.
Yes
NoDoes proper DC 14.5V appear at C1002. Change a Assy PCB Power.
Yes
NoDoes proper DC5V appear at C1004? Change a Assy PCB Power.
Yes
NoDoes proper DC3.3V, 1.2v appear at 1112, C1052?
Check IC1013, IC1005.Change a main PBA.
NoA power is supplied to set? Check a other function.(No picture part) Replace a lcd panel.
Caution Make sure to disconnect the power before working on the IP board.
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4-3
4. Troubleshooting
4-2-1. Circuit diagrams when the power does not turn on
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4-4
4. Troubleshooting
4-3. No Video (Analog PC)
Symptom Though the LED power turns on, the screen is blank when connecting the VGA cable.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the VGA cable.Check the D-sub cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
Main Board Front
IC5002
RA5008~ RA5012
Yes
NoCheck a PC source and checkthe connection of DSUB cable?
Input a analog PC signal andconnected cable(DPMS).
Yes
No Does the sigmal appear at R3020, R3021,R3022?
PC cable. Change a PCcable. Change a main PCB assy.
Yes
NoDoes the digital data appear at the output of RA5008~RA5012?
Check IC5002.Change a main PBA.
NoCheck a LVDS cable?Replace a lcd panel? Please, Call to Samsung Co. LTD.
Yes
Power Indicator is off.Lamp on, no video.
Caution Make sure to disconnect the power before working on the IP board.
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4-5
4. Troubleshooting
4-3-1. Circuit diagrams and waveforms (Analog) when no screen is displayed on the monitor
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4-6
4. Troubleshooting
4-3-2. Waveforms when no screen is displayed (Analog PC) R,G,B Output Signal of IC5002
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4-7
4. Troubleshooting
4-4. No Video (Digital-HDMI)
Symptom The LED power turns on but the screen is blank when the DVI cable or HDMI cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the DVI cable or HDMI cable.Check the DVI cable or HDMI cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
Main Board Front
IC5002
Yes
NoCheck the connectionof HDMI cable? Input a HDMI cable.
Yes
No Does the digital data appear at D3006~D3013 ( HDMI1)?
Check HDMI cable.Change the cable.
NoDoes the digital data appear at output of IC5002?
Check the IC5002.Change a main PBA.
Yes
Power Indicator is off.Lamp on, no video.
Yes
NoCheck a LVDS cable?Replace lcd panel? Please, Call to Samsung Co. LTD.
Caution Make sure to disconnect the power before working on the IP board.
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4-8
4. Troubleshooting
4-4-1. Circuit diagrams and waveforms (Digital-HDMI) when no screen is displayed on the monitor
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4-9
4. Troubleshooting
4-4-2. Waveforms when a blank screen is displayed (Digital-HDMI) Digital Output Data of IC3250 Signal of HDMI(Data)
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4-10
4. Troubleshooting
4-5. No Picture (Tuner_CVBS)
Symptom The LED power turns on but the screen is blank when the RF cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the RF cable.Check the RF cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
TU6001
Main Board Front
IC5002
Yes
NoPower Indicator is off. Lamp on, no picure.
Connect the RF cable and check RF signal.
Yes
No Does the signal appear at L6001?
Check the Tuner Vcc 5V.Change a main PBA.
Yes
No Does the signal appear at #9 of TU6001?
Change a main PCB assy.
No Does the digital data appear at output of RA5008 ~RA5012?
Check a IC5002.Change a main PCB assy.
Yes
NoCheck a LVDS cable?Replacea lcd panel? Please, Call to Samsung Co. LTD.
Caution Make sure to disconnect the power before working on the IP board.
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4-11
4. Troubleshooting
4-5-1. Circuit diagrams and waveforms (Tuner_CVBS) when no screen is displayed on the monitor
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4-12
4. Troubleshooting
4-5-2. Waveforms when a blank screen is displayed (Tuner_CVBS) CVBS Output Signal Tuner_CVBS Output Signal
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4-13
4. Troubleshooting
4-6. No Picture (AV)
Symptom The LED power turns on but the screen is blank when the Antenna Cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the Antenna Cable.Check the Antenna Cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics Main Board Front
Yes
NoPower Indicator is off. Lamp on, No signal image. check antenna cable
Yes
No Does the AV signal appear at #52pin of IC5002?
check antenna cableChange a main PBA
NoCheck a LVDS cable?Replace lcd panel? Please, Call to Samsung Co. LTD.
Caution Make sure to disconnect the power before working on the IP board.
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4-14
4. Troubleshooting
4-6-1. Circuit diagrams and waveforms (AV) when no screen is displayed on the monitor
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4-15
4. Troubleshooting
4-6-2. Waveforms when a blank screen is displayed (AV) CVBS Output Signal
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4-16
4. Troubleshooting
4-7. No Picture (S-VIDEO)
Symptom The LED power turns on but the screen is blank when the Antenna Cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the Antenna Cable.Check the Antenna Cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics Main Board Front
Yes
NoPower Indicator is off. Lamp on, No signal image. check antenna cable
Yes
No Does the S-VIDEO signal appear at #50, 51 pin of IC5002?
check antenna cableChange a main PBA
NoCheck a LVDS cable?Replace lcd panel? Please, Call to Samsung Co. LTD.
Caution Make sure to disconnect the power before working on the IP board.
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4-17
4. Troubleshooting
4-7-1. Circuit diagrams and waveforms (S-VIDEO) when no screen is displayed on the monitor
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4-18
4. Troubleshooting
4-7-2. Waveforms when a blank screen is displayed (S-VIDEO) CVBS Output Signal
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4-19
4. Troubleshooting
4-8. No Picture (Component)
Symptom The LED power turns on but the screen is blank when the Antenna Cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the Antenna Cable.Check the Ant enna Cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics Main Board Front
Yes
NoPower Indicator is off. Lamp on, No signal image. check antenna cable
Yes
No Does the Component signal appear at #44, 46, 47 pin of
IC5002?
check antenna cableChange a main PBA
NoCheck a LVDS cable?Replace lcd panel? Please, Call to Samsung Co. LTD.
Caution Make sure to disconnect the power before working on the IP board.
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4-20
4. Troubleshooting
4-8-1. Circuit diagrams and waveforms (Component) when no screen is displayed on the monitor
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4-21
4. Troubleshooting
4-8-2. Waveforms when a blank screen is displayed (Component) CVBS Output Signal
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4-22
4. Troubleshooting
4-9. No Sound
Symptom The LED power turns on but the screen is blank when the DVI cable is connected.-
Major checkpoints
Even though the LED power turns on, the screen is blank when connecting the DVI cable.Check the DVI cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
IC5002 IC2005
Main Board Front
Yes
NoPicture is display, no sound. Connect a sound cable.control a volume.
Yes
No Does the signal appear at Pin #71,72,73,74,76,77,78,79 of IC5002?
Check a connection harness.
Yes
NoCheck the 3.3V of #25 IC2005. check IC2003.Change a main PBA.
No check output signal of #36,37,31,30,54,53,48,47 of IC2005
check IC2005.
Yes
Replace the speaker assy?
Caution Make sure to disconnect the power before working on the IP board.
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4-23
4. Troubleshooting
4-9-1. Circuit diagrams and waveforms (No Sound) when no screen is displayed on the monitor
21
R500
9
21
R5013_DE
21
R5015_DE
21
R5014_DE
8 6 4 2
7 5 3 1RA5030
8 6 4 2
7 5 3 1RA5029
21
C507
7
8 6 4 2
7 5 3 1
RA5028
21
R5067
21R5074
21R5081
21
C508
4
21
C507
9
21C5101
21
R506
8
21C5100
21R5076
21
C508
8
21
C508
32
1C508
2
21
C507
8
8642
7531RA5033_DE
8642
7531
RA5032
21C508
6
21C508
7
21
C508
1
9998979695949392919089888786858483828180797877767574737271706968676665
6463626160595857
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
21C5091
21
R506
5
21C5094
21R5078
21C508
9
21
C508
5
21
C508
0
SW_P
OWER
IDEN
T_HP
IDEN
T_DV
I
IDEN
T_HD
MI2
SEL1
_HDM
I
1/16W10KOHM
100OHM
100OHM
100OHM
100OHM
100OHM
50V2.2NF
100OHM
100NF25V
1UF10V
4.7U
F10V
10KOHM1/16W
10V
4.7U
F
4.7U
F10V
10V
4.7U
F
10V
10UF
1/10W22KOHM
50V2.2NF
100OHM
2.2NF 50V
4.7U
F10V
4.7U
F10V
22KOHM 1/10W
1/10W22KOHM
100OHM
100OHM
4.7U
F10V
A3.3V
A3.3V_AU FGND
VDDC
A3.3V_VDDP
10V
4.7U
F
4.7U
F10V
100NF25V
1/10W22KOHM
A3.3V_AD
C
FGND
15 14 13 12 11 10 9 8 7 6 5 4
50V2.2NF
FGND
A3.3V_SI
F
1/10
W0OHM
SC_S
R_IN
SC_S
L_IN
MDATA
SC_S
R_OU
T2SC
_SL_
OUT2
COMP
_SR_
INCO
MP_S
L_IN
DTV_
AUDI
O_R
DTV_
AUDI
O_L
PC_S
R_IN
MDATA
MDATA
MDATA
MDATA
MDATA
MDATAMDATA
MDATAMDATA
MDATAMDATADQS1
PC_S
L_IN
MDATA(0:15)
IDEN
T_PC
IDENT_SIDE_SVH
SID
ENT_
COMP
IDEN
T_HD
MI1
HP_O
UT_L
1HP
_OUT
_R1
MDAT
A(0:
15)
AVDD_SIFSIF0PGNDCVBSOUT0CVBSOUT1AVDD_ADCVCOM0
SIF1P
GND
AUVREADN
AUVRADP
AUVREF
AVDD_AU
AUL0
AUR0
AUL1
AUR1
AUCOM
AUL2
AUR2
AUL3
AUR3
AUMONO
AUOUTL3
AUOUTR3
AUOUTL2
AUOUTR2
AUOUTL1
AUOUTR1
AUOUTL0
AUOUTR0
GPIOF[0]
GPIOF[1]
GPIOF[2]
GPIOF[3]
GPIOF[4]
GPIOF[5]
GPIOF[6]
GPIOF[7]
GPIOF[9]
VDDP
GND
VDDC
DQS[1]
MDATA[15]
MDATA[14]
GND
MDATA[13]
MDATA[12]
VDDM
MDATA[11]
MDATA[10]
MDATA[9]
MDATA[8]
GND
VDDM
MDATA[7]
MDATA[6]
MDATA[5]
MDATA[4]
VDDM
SIFM
GPIOF[8]
CLOSE TO IC
CHASSIS GND
CLOSE TO ICCLOSE TO IC
SPK_OUT
SPK_R
SPK_L
CHASSIS GND
CLOSE TO IC
CLOSE TO IC
CLOSE TO IC
CLOSE TO IC
1 SPK_R+1
SPK_R-
1
SPK_L+
1
SPK_L- 4321
CN2001
21BD2006
21BD2005
21C2
042
21
R2015
21R2014
21C2018
21C2019
21R2016
21
C201
5
21
C201
6
21
C201
4
21 R2017
21
C201
7
21 C2013
21C2012
2 1C2011
21
D200
6
21 C2008 21
C200
42
1
C2003
21BD2001
21
C200
5
21
D200
7
21 C2002 21 R2003
4 321
L200
1
21C2001
21R2002
21 C2039 21 R2006
21
C207
6
21
C207
8
21
R200
5
21
C204
1
21BD2003
21 C2079
21
C208
0
21R2001
21
C207
5
21
C207
7
21
R200
4
21C2
040
21BD2002
21C2006
21 C2007
21
C200
9
21C2
010
21
C2038
2 1BD2004
21D2
008
21 C2036
21 C2035 21 R2008 21 C2034 21 R2007
21
C2029
21
R201
0
21
C203
1
21
C203
0
21
R200
9
21BD2008
21C2
027
21C2
028
21BD2007
21
C208
2
21C2
083
21C2
081
21C2
043
21C2
023
2 1D2009
MGND19876
56 55 54 53 52 51 50
5
49 48 47 46 45 44 43
424140
4 39383736353433323130
3
29
282726252423222120
2
1918171615
1413121110
1
IC2005
21
C20242 1
R2013
21 C2025 21R2012 21 C2026 21 R2011
21
C2037
4 321
L200
2
21
C203
3
21
C203
2100N
F50V
50V
470N
F
DDA-
0808
100NF 25V
4.7OHM 1/10W1NF 50V4.7OHM 1/10W1NF 50V
1/10W0OHM
50V22NF
NTP-3000
75VLL4148
10V
1UF
25V
100N
F
33PF
50V
33PF
50VB1.8V_AMP
25V
100N
F
BEAD_CHIP
1NF50V
50V
1NF
BEAD_CHIP
4.7KOHM
1/10
W
100NF50V
100N
F50V
4.7KOHM
1/10
W
100NF50V
4.7OHM1/10W1NF 50V1/10W4.7OHM1NF 50V
25V100NF
75V
LL41
48
BEAD_CHIP
220UF35V
22NF
50V
10V
1UF
1UF 10V
22NF 50V
BEAD_CHIP50V
1NF
1/10
W4.
7KOH
M50V
100N
F
50V
100N
F
4.7OHM 1/10W
50V
470N
F
50V1NF
BEAD_CHIP
50V
1NF5
0V10
0NF
100N
F50V
B12VS1/10W4.7OHM1NF 50V
4.7OHM 1/10W1NF 50V
DDA-
0808
1/10W4.7OHM50V1NF
75V
LL41
4825V
100N
F
BEAD_CHIP
B12VS
35V220UF
100N
F25V
B3.3VD
22NF 50V
75V
LL41
48
10V1UF
100PF 50V
25V100NF
100OHM 1/10W
25V
100N
F
AVDD_PLL
10UF
10VDVDD_PLL
1/10W3.3KOHM
100PF 50V
1NF 50V
1/10W100OHM
1KOHM 1/10WB1.8V_AMP
AVDD_PLL
10UF
10V
DVDD_PLLBEAD_CHIP
BEAD_CHIP
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
FGND
CN_S_004
AMP_MUTEAUSDAUWSAUSCK
AMP_RESETAUMCKO
SDA1SCL1
SPK_RSPK_R_SPK_LSPK_L_
SPK_LSPK_L_
SPK_RSPK_R_
4.7K
OHM
1/10
W
25V
100N
F
10UF10V
CLK_CLK_VSS_AD/RESETVDR1ABST1A P
GND1
APG
ND1A
OUT1
AOU
T1A
PVDD
1APV
DD1A
PVDD
1BPV
DD1B
OUT1
BOU
T1B
PGND
1BPG
ND1B
BST1
BVD
R1B
NCVDR2ABST2A
PGND2APGND2AOUT2AOUT2A
PVDD2APVDD2APVDD2BPVDD2BOUT2BOUT2B
PGND2B
PGND
2BBS
T2B
VDR2
BSO
FT_R
ESET
_2PW
M_MA
SK_2
AUX_
PWM3
AAU
X_PW
M3B
SCL
SDA
BCK
WCK
SDAT
ADV
DDDVSS
TEST0DVDDPLLAVDDPLLLFMAGNDPLLDGNDPLLVDD_
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4-24
4. Troubleshooting
4-9-1. Waveforms when a blank screen is displayed (No Sound)
The Signal are Inputed to IC5002 DC 3.3V
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4-25
4. Troubleshooting
4-10. Faults and Corrective ActionsFault Photo Symptoms and Corrective Actions Remarks
Symptoms: DVI signals are not recognized.
Causes: This fault occurs when the PC does not recognize the mode information because the DVI DDC has not been input to the monitor.
Corrective Actions: Input the DVI DDC to the monitor.
* Refer to the Training Manual for information on inputting the DVI DDC.
Symptoms: When the monitor is turned on, only a full white pattern is displayed continually regardless of the signals.
Causes: This fault occurs when only the lamp power is supplied and no video signals are input to the panel due to a fault or incorrect connections of the LVDS cable.
Corrective Actions: Replace or reconnect the LVDS cable correctly so that video signals can be supplied to the panel.
* A full white pattern is a feature of the TN panel and is displayed when no
video signals are supplied.
Symptoms: When connecting the DVD, noise occurs on the screen.
Causes: The HDCP key is not inserted.
Corrective Actions: Enter the HDCP key. (See page 4-17.)
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4-26
4. Troubleshooting
4-11. Adjustment
4-11-1. Service Instruction1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.2. Use the specified test equipment or its equivalent.3. Correct impedance matching is essential.4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers, do not allow the marker generator to distort test result.5. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is
disconnected before replacing any parts.7. To protect aganist shock hazard, use an isolation transform.
4-12. How to Access Service Mode
4-12-1. Entering Factory Mode2. To enter Service Mode Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
MUTEPower OFF 1 8 Power ON2 - If you have Factory remote - control
PICTURE ON INFO FACTORY
- The buttons are active in the service mode.1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left Arrow Right, Menu, Enter, Number Key(0~9)2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -, Menu, TV/VIDEO(Enter)
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4-27
4. Troubleshooting
4-13. Service Adjustment
4-13-1. White Balance - CalibrationIf picture color is wrong, do calibration first.
Equipment : CA210, Patten : chess patternExecute calibration in Factory Mode Source PC : 1024*768/60Hz
(Gray patten)
4-13-2. White Balance - AdjustmentIf picture color is wrong, check White Balance condition.
Equipment : CA210, Patten : ToshibaAdjust W/B in Factory Mode
Sub brightness and R/G/B Offset controls low light regionSub contrast and R/G/B Gain controls high light regionSource AV : PAL composite, Component : 1280*720/60Hz
HDMI[DVI] : 1280*720/60Hz
[ Test Pattern : MSPG-945 Series Pattern #16 ]
*Color temperature 1500K +/-500, -6 ~-20 MPCD
*Color coordinate H/L : 272/278 +/- 2 35.0 Ft +/- 2.0Ft L/L : 272/278 +/- 3 1.5 Ft +/- 0.2Ft
Toshiba Patten
4-13-3. Conditions for Measurement1. On the basis of toshiba ABL pattern : High Light level (57 IRE)
- INPUT SIGNAL GENERATOR : MSPG-925LTH* Mode NO 2 : 744X484@60 Hz
NO 6 : 1280X720@60 Hz NO 21 : 1024X768@60 Hz
* Pattern NO 36 : 16 Color Pattern NO 16 : Toshiba ABL Pattern2. Optical measuring device : CA210 (FL)Please use the MSPG-925 LTH generator for model LE26M51B/LE32M51B/LE40M51B/LE46M51B.
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4-28
4. Troubleshooting
4-13-4. Method of Adjustment1. Adjust the white balance of AV, Component Modes.
(AVComponent) a) Set the input to the mode in which the adjustment will be made.
(RFDTVPCDVI).* Input signal - VIDEO Mode : Model #2 (744*484 Mode), Pattern #16
- DTV,DVI Mode : Model #6 (1280*720 Mode), Pattern #16 - HDMI Mode: Model #6(1280*720 Mode), Pattern #16
b) Enter factory color control, confirm the data.
c) Adjust the low light. (Refer to table 1, 2 in adjustment position by mode) - Adjust sub - Brightness to set the Y value. - Adjust red offset (x) and blue offset (y) to the color coordinates.
Low light Measurement point
Picture 4-2 Toshiba ABL Pattern
* Do not adjust green offset data. d) Adjust the high light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust red gain (x) and blue gain (y) to the color coordinates.* Do not adjust the green gain and sub-contrast (Y) data. d) Adjust the high light. (Refer to table 1, 2 in adjustment position by mode)
- Adjust red gain (x) and blue gain (y) to the color coordinates.* Do not adjust the green gain and sub-contrast (Y) data.
Low light Measurement point
Picture 4-3 Toshiba ABL Pattern
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4-29
4. Troubleshooting
4-14. Software Upgrade
4-14-1. How to Update Flash ROM1. Install the Flash Downloader
Connector Set(D-SUB) and D-SUB cable to execute Program Update.
2. Flash Downloader program update - Turn on the TV Set - Click Connect icon on the MSTAR tool. - Click Read, and Choose a new S/W. - Click Auto, and Run
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4-30
4. Troubleshooting
Memo
4. Troubleshooting4-1. First Checklist for Troubleshooting4-2. No Power4-3. No Video (Analog PC)4-4. No Video (Digital-HDMI)4-5. No Picture (Tuner_CVBS)4-6. No Picture (AV)4-7. No Picture (S-VIDEO)4-8. No Picture (Component)4-9. No Sound4-10. Faults and Corrective Actions4-11. Adjustment4-12. How to Access Service Mode4-13. Service Adjustment4-14. Software Upgrade