LG HR832T Service Manual page 96

ELECTRICAL TROUBLESHOOTING GUIDE
No FD( + )
YES
Is the
Vcc supplied to D121
anode?
YES
Is the D121
output -21V?
YES
Check soldering
connector P101.
No FD( - )
YES
Is the Vcc
-29 V supplied to ZD121
cathode?
YES
Is the ZD121
output -25 V?
YES
Check soldering
connector P101.
NO
Check SMPS primer side
NO
D121 OK?
C120 OK?
NO
Check no -29 VA.
NO
ZD121 OK?
R131 OK?
3-81
NO
YES
YES
NO
YES
YES
Check or replace D121.
Check or replace C120.
Check or replace ZD121.
Check or replace R131.