Samsung UN19D4003BD, UN26D4003BD, UN32D4003BD, UN22D5003BF, LN32D40*E*D Service Manual
4. Troubleshooting
4-1. Troubleshooting
4-1-1. Previous check
Check the various cable connections rst. 1.
• Check to see if there is a burnt or damaged cable.
• Check to see if there is a disconnected or loose cable connection.
• Check to see if the cables are connected according to the connection diagram.
Check the power input to the Main Board.2.
4. Troubleshooting
14p cable
Power Assy
Speaker
Main Assy (CN202 / 204)
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
LVDS Cable
Main Assy
Speaker
Power Assy (CMN801)
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
14p cable
Main Assy
LVDS Cable
Speaker
Main Assy (CN201 / 203)
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
Power Assy
T-CON
Speaker
Power Assy (CMN801)
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
4-1
4-2
4. Troubleshooting
4-1-2. How to check fault symptom
No Power
The LEDs on the front panel do not work when connecting the power cord. -
Symptom
Major
checkpoints
The SMPS relay does not work when connecting the power cord. -
The units appears to be dead. -
The IP relay or the LEDs on the front panel does not work when connecting the power cord if the
cables are improperly connected or the Main Board or SMPS is not functioning.
In this case, check the following:
Check the internal cable connection status inside the unit. -
Check the fuses of each part. -
Check the output voltage of SMPS. -
Replace the Main Board. -
Power indicator LED on?
Yes
Check the 14P power cable
Yes
No
Check an AC power connection.
No
Change 14p power cable or SMPS.
Diagnostics
Check ‘Stand-By 5V’ DC5V appear at
BD207(middle)/BD214(small)?
Yes
Check ‘Power input of Main Assy’ ?
DC B13V, B5V appear at BD209(M)/BD221(S)
(B13V), BD208, BD213(M)/BD210, 212(S)
Yes
Check ‘Power of main IC(B1.1V)’
Check ‘Power of DDR IC(B1.9V)’
appear at L201 (B1.1V)
BD1012 (B1.9V) ?
Yes
Check ‘Power of LVDS (13V)’ appear at
LVDS connector Pin #1~5 of T-con b’d?
Yes
Does proper DC B13V appear at F1 of
T-con b’d?
Yes
(B5V)?
No
No
No
No
No
Change SMPS.
Change the Main Assy.
Change the LVDS cable.
Change the T-con b’d.
Please, Contact tech support.
Caution Make sure to disconnect the power before working on the IP board.
4-3
4. Troubleshooting
Location (Main) - TOP
Location (Main) - T-CON
4-4
4. Troubleshooting
No video_HDMI1, 2 - Digital signal
Symptom Audio is normal but no picture is displayed on the screen. -
Major
checkpoints
Check the HDMI source. -
Check the HDMI switch, Check the Chelsea. -
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. -
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
check the Self Diagnosis
(SupportSelf DiagnosisPicture Test)
Dose the promblem still exist self diagnosis ?
Yes
Check the HDMI source and
check the connection of HDMI cable ?
Yes
Does the signal appear at
CN602 (Pin#12 , #7 )(HDMI1)
CN601 (Pin#12 , #7 )(HDMI2)
(HDMI RX_Clk , RX_Data) ?
Yes
No
No
No
No
Check a set in the 'Stand-by mode'.
Check external devices and
connections.
Input the HDMI signal properly.
Check CN502, CN503.
Check HDMI cable.
Change the Main Assy.
Diagnostics
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK- ,
O_TXCLK+, O_TXCLK-?
Yes
Check the LVDS cable ?
Check the T-Con B’d ?
Replace the LCD panel ?
No
No
Check IC1001 (X5N)
Change the Main Assy.
Please, Contact Tech support.
Caution Make sure to disconnect the power before working on the IP board.
4-5
4. Troubleshooting
Location (Main) - TOP
4-6
4. Troubleshooting
WAVEFORMS
HDMI input (RX_Data, RX_Clk)
LVDS output
4-7
4. Troubleshooting
No Video_Tuner - CVBS
Symptom Audio is normal but no picture is displayed on the screen. -
Major
checkpoints
Check the Tuner CVBS source. -
Check the Tuner, Check the Chelsea. -
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. -
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable ?
Yes
check the Self Diagnosis
(SupportSelf DiagnosisPicture Test)
Dose the promblem still exist self diagnosis ?
Yes
Does the DC B1.8V B3.3V
appear at #3, #5 Pin of Tuner ?
Yes
Check the CVBS data
at #15 Pin of Tuner ?
No
No
No
No
No
Check a set in the 'Stand-by mode'
Input the RF source properly.
Check external devices and
connections.
Change the Main Assy.
Change the Main Assy.
Diagnostics
Yes
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK- ,
O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable ?
Check the T-Con B’d ?
Replace the LCD panel ?
No
No
Check IC1001 (X5N).
Change the Main Assy.
Please, Contact Tech support.
Caution Make sure to disconnect the power before working on the IP board.
4-8
4. Troubleshooting
Location (Main) - TOP
4-9
4. Troubleshooting
WAVEFORMS
LVDS output
4-10
4. Troubleshooting
No Video_Tuner DTV
Symptom Audio is normal but no picture is displayed on the screen. -
Major
checkpoints
Check the DTV source. -
Check the Tuner, Check the Chelsea. -
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. -
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the connection of RF cable ?
Yes
check the Self Diagnosis
(SupportSelf DiagnosisPicture Test)
Dose the promblem still exist self diagnosis ?
Yes
Check the 'signal strength' in Self Diagnosis
menu Strength is enough ?
Yes
Does the DC B1.8V B3.3V
appear at #3, #5 Pin of Tuner ?
Yes
No
No
No
No
No
Check a set in the 'Stand-by mode'
Input the RF source properly.
Check external devices and
connections.
Check the D-TV source.
Change the Main Assy.
Diagnostics
Check the DTV data(DIF+, DIF-)
appear at #11, #10 Pin of Tuner ?
Yes
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK- ,
O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable ?
Check the T-Con B'd ?
Replace the LCD panel ?
No
No
No
Change the Main Assy.
Check IC1001 (X5)
Change the Main Assy.
Please, Contact Tech support.
Caution Make sure to disconnect the power before working on the IP board.
4-11
4. Troubleshooting
Location (Main) - TOP
4-12
4. Troubleshooting
WAVEFORMS
LVDS output
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