Service manual

GH15DS 4-1

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC’s display as below.

• Resolution: 1024 x 768

• H-frequency: 48 kHz

• V-frequency: 60 Hz

2. If no picture appears, make sure the power cord is correctly connected.

3. Check the following circuits.

• No raster appears: Main PCB

• 12V develop but no screen: Main PCB

• 12V does not develop: Main PCB

4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically turns back

to the factory preset(GH15DS).

4-1 Power

Does proper DC 12 V

appear at CN100?

Check Power Adaptor.

Yes

Does proper DC 5 V appear at

output Pin of IC100?

Check IC100 and related circuit.

Check IC101, IC102, IC601, IC401

and related circuit.

Yes

Does proper 3.3 V - signals

appear at output Pin of IC103?

Check IC103 and related circuit.

Yes

Does proper 3.3 V - signals

appear at Pin 7 of CN100?

Check CN100-7 and related circuit.

Yes

Does proper 3.3 V - signals

appear at R300?

Check IC301 and related circuit.