Samsung DS17BS, Service Manual

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DS17BS* 5-1
5 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1280 x 1024
• 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.
5-1 No Power
Does proper DC 14 V appear at
Pin 39, 40 or Pin 41 of CN01?
Check SMPS.
Yes
No
Does proper DC 5 V appear at
Pin 2 of IC104?
Check IC104 and it’s related circuit.
Replace IC102.
Yes
Does proper DC 5 V appear at
Pin 5 of IC102?
Yes
Does the pulse appear at X102?
Yes
While pushing the power key
does voltage drop from 5V to 0V
at Pin 16 of IC102?
Yes
No
Check IC104 or IC102
and it’s related circuit.
No
Check X102 or check
it’s related circuit.
No
Check function key or
check it’s related circuit.
No
2