Samsung SyncMaster EX2220, 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 the power cable, the LED at the front of the
monitor does not operate.
Major checkpoints
- When turning on the Power button after connecting the power cable, the LED at the front of the
monitor does not operate.
- Check the IP board power fuse and the IP board output power.
- Check the connections for the IP board 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
CN600
IC601
IC602
Yes
Check the connection status for
the function assy.
Yes
Replace the IP board.
No
Is DC 5V measured at pins 5, 6 of the
CN600 connector when pins 3, 4 are
0V?
IIs DC 3.3V measured at pin 3 of IC601
when pin 1 is DC 5V?
Check the circuits related to
IC601.
No
Yes
Check the circuits related to
IC602.
No
Is DC 1.8V measured at pin 2 of IC602
when pin 3 is DC 5V?
Yes
Check and replace the IP board.
Caution Make sure to disconnect the power before working on the IP board.