No Power - Samsung GY15MS series Service Manual

5-2 Troubleshooting (GY17MS*)
Notes: 1. Before troubleshooting, setup the PC's display as below.
• Resolution: 1280 x 1024
• H-frequency: 81 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
• 14V develop but no screen: Main PCB
• 14V does not develop: Main PCB
4. If you push and hold the Exit for more than 5 seconds, the monitor automatically turns back
to the factory preset.

5-2-1 No Power

Does proper DC 14V
appear at DC jack and
Pin 1 of CN103?
Yes
Does proper DC 5V, DC 3.3V
appear at Pin 2 of IC104,
and Pin 2 of IC107?
Yes
Does proper DC 1.8V
appear at Pin 4 of IC105?
Yes
Does proper 5.0V
appear at Pin 5, 6 of IC106 and
Pin 7, 8 of IC106? (Pin 2 (DPMS_ON)
Pin 2 and 4 (PANEL_ON_OFF) of IC106
must be low level)
Yes
Check IC201.
GY15MS*/GY17MS*
No
Check signal cable and
power adaptor and CN103.
No
Check IC107, IC104
and related circuit.
No
Check IC105
and related circuit.
No
Check IC106, IC101
and related circuit.
5 Troubleshooting
5-3