Samsung UN32D5500RF, Service Manual

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4-16
4. Troubleshooting
No Video_Video CVBS
„
Symptom Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Video CVBS source
-
Check the Chelsea.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Main Assy
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
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
Main Ass’y
14p cable
Speaker
Power Ass’y
LVDS cable
T-con
Does the CVBS data appear at
R816/R821(CVBS1) ?
Does the digital data appear at
TP-, E_TXCLK- ,
, O_TXCLK- ?
Yes
Yes
Yes
Yes
Check a set in the 'Stand-by mode'
Input the video source properly.
Please, Contact Tech support.
Check CN504
Change the Main Assy.
Check IC1001 (X5)
Change the Main Assy.
No
No
No
No
No
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the video source and
check the connection of video cable?
Check the LVDS cable ?
Check the T-Con B'd ?
Replace the LCD panel ?


Yes
Check external devices and
connections.
No
check the Self Diagnosis
(Support

Self Diagnosis

Picture Test)
Dose the promblem still exist self diagnosis ?
Caution Make sure to disconnect the power before working on the IP board.