No Video (Analog Pc) - Samsung T220M 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
RA5008~
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
R3020, R3021,R3022?
Yes
Does the digital data appear at the
output of RA5008~RA5012?
Yes
Check a LVDS cable?
Replace a lcd panel?
RA5012
IC5002
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 IC5002.
Change a main PBA.
Please, Call to Samsung Co. LTD.