No Power - Samsung GH17P Service Manual

4 Troubleshooting
4-2 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 Minus(–) button for more than 5 seconds, the monitor automatically turns back
to the factory preset.

4-2-1 No Power

Does proper DC 12V appear at
and Pin 1, 2 of CN503 ?
Yes
Does proper DC 3.3V appear
at Pin 2 of IC523, IC510 and DC 2.5V
appear at Pin 3 of IC104?
Yes
Does proper DC 5V,
appear at Pin 3 of IC524?
Yes
Check IC521.
4-4
(GH18P*)
No
No
Check IC523, IC510, IC104
No
Check IC524 and related circuit.
Change power apaptor.
and related circuit.
GH17P*/GH18P*