When The Power Does Not Turn On - Samsung PX2370 Service Manual

4. Troubleshooting

4-2. When the power does Not Turn on

- When turning on the power button after connecting Adaptor, the LED at the front of the monitor
Symptom
does not operate.
- Check the Adaptor power fuse and the Adaptor output power.
- Check the connections for Adaptor and the Main board inside the monitor.
Major checkpoints
- Check the Main board power part and also check whether there is any abnormal output at any of
the other output terminals
Diagnostics
Caution Make sure to disconnect the power before working on the Adaptor.
4-2
Is DC12V measured at pins2 of the
CN601 connector when pins 1,3 are
0V?
Yes
Is DC5V measured at C698 of the
IC604 when pin2 is DC 12V?
Yes
Is DC3.3V measured at pin5 of the
IC601 when pin4 is DC 5V?
Yes
Is DC1.8V measured at pin5 of the
IC602 when pin4 is DC 5V?
Yes
Check and replace the Adaptor.
IC602
IC601
IC604
Yes
No
No
No
No
CN601
Check the connection status for
the function ass'y.
Replace the Adaptor.
Check the circuits related to
IC604.
Check the circuits related to
IC601.
Check the circuits related to
IC602.