No Video (Analog Pc) - Samsung T220HD 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.
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
RA5009
RA5010
RA5011
RA5012
R3020
R3021
R3022
Power Indicator is off.
Lamp on, no video.
Yes
Check a PC source and check
the connection of DSUB cable?
Yes
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?
IC5002
Main Board Front
Input a analog PC signal and
No
connected cable(DPMS).
PC cable. Change a PC
No
cable. Change a main PCB ass'y.
No
Change a main PBA.
No
Please, Call to Samsung Co. LTD.
Check IC5002.