No Video (Tuner_Cvbs) - Samsung LA37C630 Series Service Manual

4-1-4. No Video (Tuner_CVBS)

Symptom Audio is normal but no picture is displayed on the screen.
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Check the Tuner CVBS source
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Major
Check the IC6001(SDP84)
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checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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1
2
Diagnostics
3
Caution Make sure to disconnect the power before working on the IP board.
Power Indicator is off.
Lamp on, no picure.
Yes
Does the signal appear at R5035?
Yes
[4] Does the signal appear at
pin 9 of TU5001?
Yes
Does the digital data appear at the
output of LVDS (TP7025~TP7038 ,
TP7040~TP7053)?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Connect the RF cable and
check RF signal.
No
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass'y.
Check a Tuner(TU5001)
No
Change a main PCB ass'y.
No
Check a IC7001
Change a main PCB ass'y
No
Please, Contact Tech support.
4. Troubleshooting
4-7