Samsung LA22B450C4H Service Manual page 200

4. Troubleshooting
4-1-3. No Video (Analog PC signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the PC source
-
Major
Check the Arsenal, Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
1
2
Caution Make sure to disconnect the power before working on the IP board.
4-4
Power indicator LED is off.
Lamp(Backlight) on, no video
Yes
Check the PC source and
check the connection of D-SUB
Yes
Does the signal appear at TP5002,
5003, 5004, 5006, 5008?
Yes
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
in the 'Stand-by mode' or
'DPMS mode'
Input the analog
No
PC signal properly.
Check CN5001, PC cable.
No
Change the Main Assy
No
Check IC4010 (Saturn4)
Change the Main Assy
No
Please, Contact Tech support.
Check a set