No Video (Analog) - Samsung 932MW Service Manual

4. Troubleshooting

4-3. No Video (Analog)

Symptom Though the LED power turns on, the screen is blank when connecting the VGA cable.
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Check the D-sub cable connections.
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Major
Check whether the LVDS cable is connected correctly to the panel.
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checkpoints
Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
Does led persists green light after
Does proper 5V appear at pin No. 9 of
Does proper V and H-sync appear at
Does proper clock signals appear at
Check connection between main board
Caution Make sure to disconnect the power before working on the IP board.
4-4
C101, C102
CN101
power on?
Yes
CN101?
Yes
4 5
C102 and C101?
Yes
pin NO.11,12,23,24 of CN400?
Yes
and panel. Change Panel.
CN400
No
Check IP board
Check D-sub cable
No
connection
No
Check PC state
No Change main board
because of scaler problem