No 12 V
Is Vcc (15 V)
supplied to IC931?
Check or replace D935.
YES
YES
NO
IC931 Pin4 “H”?
Check P-CTRL “H” signal from MCS.
YES
NO
Check or replace IC931.
No VFD
YES
D931 normal?
ZD931 normal?
Q301 / Q302 normal?
Check or replace D931.
Check or replace ZD931.
Check or replace Q301 / Q302.
YES
YES
YES
NO
NO
NO
Check or replace VFD.
POWER (SMPS)
3-18
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ELECTRICAL TROUBLESHOOTING GUIDE
Содержание CK57
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