LG CJS45F Service Manual page 48
Mini hi-fi system
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Also See for CJS45F:
- Owner's manual (42 pages) ,
- Owner's manual (37 pages) ,
- Service manual (65 pages)
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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.
3-19
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