No Video (Tuner_Dtv) - Samsung LN22C450E1M Service Manual

4. Troubleshooting

4-1-5. No Video (Tuner_DTV)

Symptom Audio is normal but no picture is displayed on the screen.
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Check the Tuner DTV source
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Major
Check the SETD-10 (SX1)
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
1
4
3
Caution Make sure to disconnect the power before working on the IP board.
4-8
Power Indicator is off.
Lamp on, no picure.
Yes
Does the signal appear at L1654?
Yes
[4] Does the signal appear at
pin 18~28 of TU1651?
Yes
Does the digital data appear at the
output of LVDS Signal?
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 TU1651.
No
Change a main PCB ass'y.
No
Check a IC1102.
Change a main PCB ass'y.
No
Please, Contact Tech support.