LG CJ65 Service Manual page 46

ELECTRICAL TROUBLESHOOTING GUIDE
No 12 V
YES
Is Vcc (15 V)
supplied to IC931?
YES
IC931 pin4 "H"?
YES
Check or replace IC931.
No VFD
YES
D931 normal?
YES
ZD931 normal?
YES
Q300 / Q301 normal?
YES
Check or replace VFD.
NO
Check or replace D935.
NO
Check P-CTRL "H" signal from MCU.
NO
Check or replace D931.
NO
Check or replace ZD931.
NO
Check or replace Q300 / Q301.
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