Samsung DS15AS 20030613085155078-5-trouble Troubleshooting
DS15AS* 5-1
5 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.
5-1 No Power
Does proper DC 14 V appear at
Pin 1, 2 or Pin 3 of CN101?
Check SMPS.
Yes
No
Does proper DC 5 V appear at
Pin 3 of IC203?
Check IC203.
Replace IC202.
Yes
Does proper DC 5 V appear at
Pin 5 of IC202?
Yes
Does the pulse appear at X201?
Yes
While pushing the power key
does voltage drop from 5V to 0V
at Pin 16 of IC202?
Yes
No
Check FT202 or IC202
and it’s related circuit.
No
Check X201 or check
it’s related circuit.
No
Check function key or
check it’s related circuit.
No
2
Does the pulse appear
at Pin 8 and 10 of IC102?
5 Troubleshooting
5-2 DS15AS*
5-2 No Video
Power indicator is green.
Check IC102 or
check CN101 and
check it’s related circuit.
No
Does the pulse appear at
Pin 126 and 127 of IC101?
Replace IC206 or
check it’s related circuit.
Does DC 3.3V appear at
Pin 19 and 20 of IC101?
Yes
Yes
No
No
Replace X101 or
check it’s related circuit.
No
No
Does the pulse
appear at Pin 122 of IC101?
Does the pulse
appear at Pin 74
and 75 of IC101?
Replace LCD panel.
Yes
Replace IC101.
Yes
Check IC202 and
check it’s related circuit.
Yes
3 4 516 7 8
Loading...