Samsung LT20A350 Service Manual page 48

4-1-8. No Video (Component)
Symptom
- Audio is normal but no picture is displayed on the screen.
- Check the Component source
Major
- Check the Main Chipset.
checkpoints
- This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Diagnostics
5
2
Caution Make sure to disconnect the power before working on the IP board.
SMPS BOARD
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the component source and
check the connection of
component cables(Y,Pb,Pr)?
Yes
Does the component data appear at
PIN - COMP2_Y_CVBS, COMP2_PB,
COMP2_PR?
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?
MAIN BOARD
No
Check a set in the 'Stand-by mode'
No
Input the component source properly.
Check CN503.
No
Change the Main Assy.
Check IC1111 (X5).
No
Change the Main Assy.
No Please, Contact Tech support.
4. Troubleshooting
4-19