Samsung SyncMaster PX2370, Service Manual

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