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
IC601
IC604
IC605
Main Board Front
Yes
Check the connection status for
the function assy.
Yes
Replace the IP board.
No
When Pin 3,4 of CN601 is 0V, Does
proper DC 5V appear at Pin 5,6 of
CN601 separately?
When Pin 1 of CN604 is DC 5V, Does
proper DC 3.3V appear at Pin 3 of
CN604?
Check the circuits related to
IC604.
No
Yes
Check the circuits related to
IC605.
No
When Pin 3 of CN605 is DC 5V, Does
proper DC 1.8V appear at Pin 2 of
CN605?
Yes
Check and replace the IP board.
Caution
Make sure to disconnect the power before working on the IP board.
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