GH19B* 4-1
CONFIDENTIAL
4-1 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1280 x 1024
• H-frequency: 63 kHz
• V-frequency: 75 Hz
2. If no picture appears, make sure the power cord is correctly connected.
3. Check the following circuits.
• No raster appears: Stand PCB, 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.
4-1-1 No Power
Does proper DC 12V appear at
Pin 1, 2 of CN503?
Change power apaptor.
Yes
No
Does proper DC 5V appear at
Pin 3 of IC522?
Check IC522 and related circuit.
Yes
No
Does proper DC 3.3V appear
at Pin 3 of IC523, IC510 and DC 2.5V
appear at Pin 3 of IC104?
Check IC523, IC510, IC104
and related circuit.
Yes
No
Does proper DC 5V,
appear at Pin 3 of IC524?
Check IC524 and related circuit.
Check IC521.
Yes
No
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