Samsung GG15L-V-E-M Troubleshooting
CONFIDENTIAL
GG15L*/GG15V*/GG15E*/GG15M* 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: 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 Pin 1, 2 of CN120?
Check SMPS or CN120.
Yes
No
Does proper DC 3.3 V
appear at Pin 7 of CN120?
Check SMPS.
Check IC110 and Q132.
Yes
No
CONFIDENTIAL
4 Troubleshooting
4-2 GG15L*/GG15V*/GG15E*/GG15M*
Check CN190.
No
Does the H-sync pulse
appear at Pin 43 of IC300?
Replace IC300 or
check its related circuit.
check CN190.
No
Does the H-sync pulse
appear at Pin 34 of IC300?
Yes
Yes
No
4
Does the V-sync pulse
appeaer at Pin 44 of IC300?
2
Replace IC300 or
check its related circuit.
No
Yes
Does the V-sync pulse
appeaer at Pin 33 of IC300?
3
Yes
Replace IC200 or
check its related circuit.
No
Replace LCD Panel
Yes
1
4-2 No Video
Does the waveforms
appeaer at Pin 15
and 18 of CN102?
5 6
Loading...