No Video (Dvi) - Samsung 932MW Service Manual

4. Troubleshooting

4-4. No Video (DVI)

Symptom The LED power turns on but the screen is blank when the DVI cable is connected.
-
Check the DVI cable connections.
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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.
-
Does led persists green light after
Diagnostics
Dose proper 5V appear at pin No. 14
Does proper signals appear at pin
No.6(SCL)
Does proper clock signals 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.
4-6
CN102
power on?
Yes
of CN102?
Yes
and No.7(SDA)
6
CN102?
Yes
pin NO.6 and NO.7 of IC203?
Yes
pin NO.11,12,23,24 of CN400?
Yes
and panel. Change Panel.
CN400
IC203
No
No
No
of
7
No
No
Check IP board
Check DVI cable connection
Check PC state
Check circuits related
to IC 401
Change main board because
of scaler problem.