No Video (Tuner_Cvbs) - Samsung LN32A650A1F Service Manual

Lcd-tv with chassis: gam32mus, gam40mus, gam46mus, gam52mus
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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 Bayhill+
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
6
5
Caution
Make sure to disconnect the power before working on the IP board.
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 TU701?
Yes
Does the digital data appear at output
of R1308 ~R1321, R1323~R1336?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Input the RF signal.
Check the connected cable.
No
Check TU701.
Change the main PCB assembly or tuner.
No
Check IC1001
Change the main PCB assembly
No
Please, Contact Tech support
4. Troubleshooting
4-7

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