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LG CM7420 Service Manual page 52

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ELECTRICAL TROUBLESHOOTING GUIDE
No output 12 V
F901 normal?
YES
BD901 normal?
YES
D904 normal?
YES
D934, D935 normal?
YES
IC931 normal?
YES
Power Line of Main PCB is short.
NO
Replace F901 (same fuse).
NO
Replace BD901.
NO
Replace D904.
NO
Replace D934, D935.
NO
Replace IC931.
3-33

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Cms7520f

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