When The Power Does Not Turn On - Samsung P2070H 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
IC601
CN700
Is DC12V measured at pins2 of the
CN700 connector when pins 1,3 are
0V?
Yes
Is DC5V measured at C222 when pin2
of IC202 is DC 12V?
Yes
Is DC3.3V measured at pin3 of the
IC605 when pin1 is DC 5V?
Yes
Is DC3.3V measured at pin3 of the
IC601 when pin1 is DC 5V?
Yes
Is DC1.8V measured at pin1 of the
IC602 when pin3 is DC 5V?
Yes
Check and replace the Adaptor.
IC602
Yes
Check the connection status for
No
No
No
No
No
the function ass'y.
Replace the Adaptor.
Check the circuits related to
IC202.
Check the circuits related to
IC605.
Check the circuits related to
IC601.
Check the circuits related to
IC602.