Samsung UA40B6000VR Service Manual page 30

4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source
-
Major
Check the A1B
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Caution Make sure to disconnect the power before working on the IP board.
Diagnostics
6
5
4-10
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the RF source and
check the connection of RF cable?
Yes
Does the signal appear at TU600?
Yes
Does the digital data appear at output
of R1308 ~R1321, R1323~R1336?
Yes
Does the digital data appear at output
of FLB_CLKA/B, FLF_CLKA/B,
FRB_CLKA/B, FRF_CLKA/B,
BLB_CLKA/B, BLF_CLKA/B,BRB_
CLKA/B, BRF_CLKA/B
(On FRCM Board)?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Input the RF signal.
Check the connected cable.
No
Check TU600.
Change the main PCB assembly or tuner.
No
Check IC1001
Change the main PCB assembly
No
Change the FRCM Board assembly
No
Please, contact Tech support
Check IC7