No Video (Tuner_Cvbs) (Sx1) - Samsung LA22C450E1 Service Manual

4-1-4. No Video (Tuner_CVBS) (SX1)

Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source
-
Major
Check the M-star
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
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 appeat #43 of IC801?
(DRXK 43PIN CVBS_TP)
Yes
Does the Signal appear at
R505 of IC1102?
Yes
Check the LVDS cable?
Replace the LCD panel?
Yes
Please, Call to Samsung Co. LTD.
No
Connect the RF cable and
check RF signal.
Check a B+ voltage (IC801 DRXK IC)
No
Change a main PCB ass'y.
No
Change a main PCB ass'y.
4. Troubleshooting
3.3V,1.25V.
4-7