SAMSUNG MO15ESDS_EDC, MO15ESZS_EDC Service Manual Troubleshooting
CONFIDENTIAL
MO15E* 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: SMPS PCB, Main PCB
• 14V develop but no screen: Main PCB
• 14V does not develop: 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 14 V appear at
Pin 1, 2 or Pin 3 of CN202?
Check SMPS.
Yes
No
Does proper DC 3.3 V appear at
Pin 4 of IC100?
Check IC100.
Check IC101, IC301, IC500 or IC602.
Yes
No
Does the pulse appear
at Pin 8 of IC501?
CONFIDENTIAL
4 Troubleshooting
4-2 MO15E*
4-2 No Video
Power indicator is green.
Replace X501 or
check its related circuit.
No
Does the clock pulse
appear at Pin 78 of IC300?
Does the H-sync
pulse appear at
Pin 38, 39 of IC300?
Check R304, 305, 306 and 307.
Replace IC401 or check
its related circuit.
No
Do the sync pulses appear at Pin
27, 28, 30 and 31 of IC401?
Yes
Yes
No
No
Yes
Yes
Replace X301 or
check its related circuit.
No
No
1 2
Does the clock pulse
appear at Pin 73 of IC300?
9
12 8
Do the pulses appear
at Pin 43, 44 of IC501?
Replace IC202(SOG) or check R207
and Pin 13, 15, 17, 19 of CN202.
10
13 14 15
1 3 4 5
11
Do the waveforms
appear at Pins 39
and 40 of IC401?
Replace LCD Panel.
Yes
Replace IC300.
Yes
No
Replace IC501 or
check its related circuit.
Yes
6 7
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