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
- Check the IC604 power fuse and the IC604 output power.
- Check the connections for the CN601 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
CN902
IC601
IC602
Yes
Check the connection status for
the function assy.
Yes
Check the circuits related to
IC600.
Check CN601 and the IC600.
No
No
Is DC 5V measured at pins 3, 5 of the
IC600?
Is DC 3.3V measured at pin 5 of IC600.
when pin 4 is DC 5V?
Check the circuits related to
IC602.
No
Yes
Is DC 1.8V measured at pin 5 of IC602
when pin 4 is DC 5V?
Yes
Check and replace the Main board.
Caution Make sure to disconnect the power before working on the Main board.
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