No Video (Analog Pc) - Samsung 2033HD Service Manual

4. Troubleshooting

4-3. No Video (Analog PC)

Symptom Though the LED power turns on, the screen is blank when connecting the VGA cable.
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Even though the LED power turns on, the screen is blank when connecting the VGA cable.
-
Check the D-sub cable connections.
Major -
checkpoints
Check whether the LVDS cable is connected correctly to the panel.
-
Check whether the lamp connector of the panel is connected correctly to the IP board.
-
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-4
Power Indicator is off.
Lamp on, no video.
Yes
Check a PC source and check
the connection of DSUB cable?
Yes
① Does the sigmal appear at
R802, R803, R807?
Yes
Does the digital data appear at the
output of RA4000, RA4001?
Yes
Check a LVDS cable?
Replace a lcd panel?
IC4010
RA4000,RA4001
R802
R803
R807
Main Board Front
No
No
No
No
Input a analog PC signal and
connected cable(DPMS).
PC cable. Change a PC
cable. Change a main PCB ass'y.
Check IC4010.
Change a main PBA.
Please, Call to Samsung Co. LTD.