No Video (Analog) - Samsung SyncMaster 2032BW Service Manual

4-3. No Video (Analog)

Symptom -Though the LED power turns on, the screen is blank when connecting the VGA cable.
- Check the D-sub cable connections.
Major
- Check whether the LVDS cable is connected correctly to the panel.
checkpoints
- Check whether the lamp connector of the panel is connected correctly to the IP board.
Diagnostics
1
3
2
Caution Make sure to disconnect the power before working on the IP board.
Check signal cable connection
and power.
Yes
X1 oscillate proprely?
Yes
Is there R,G,B input at
R111,R114 and R118?
Yes
Is there Hsync, Vsync waveform at Pin
32,33 of IC200?
Yes
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Yes
There are DC 5V at Pin 1,
2 and 3 of CN400?
Yes
Replace LCD Panel.
Main Board Front
No
No
No
No
No
4. Troubleshooting
Replace or check related
circuit.
Check input part.
Check IC200 and related
circuit.
Check CN400 and related
circuit.
Check PANEL_EN SIGNAL
at R223 is High(On:High) and
BL_EN signal at R601(ON:
Low) is Low
4-3