3-8
ELECTRICAL TROUBLESHOOTING GUIDE
2. POWER SUPPLY ON MAIN BOARD
No 3.3 VA
No 8 VA
Check SMPS part.
Check IC100 status In main PCB.
Check IC604 working status.
Re-soldering or replace.
Check IC104 working status.
Check MICOM working status and replace.
Check IC601 and replace.
Is 20 V supplied to IC604 Pin2?
Is IC601 Pin1 is High?
Is 3.7 V at L609?
Is there good soldering status IC709?
Is 3.3 V supplied to IC104 Pin3?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
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