Troubleshooting - Samsung GH15H series Service Manual

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: Audio PCB, SMPS PCB, Main PCB
• 12V develop but no screen: Main PCB
• 12V does not develop: Audio PCB, SMPS 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 No Power
Does proper DC 12 V
appear at FT901, FT902
or Pin 1, 2 of CN101?
Yes
Does proper DC 3.3 V
appear at Pin 7 of CN 101?
Yes
Check IC102 and Q192.
GH15H*
No
Check SMPS or CN101.
No
Check SMPS.
CONFIDENTIAL
4-1