LG HR832T Service Manual page 102

ELECTRICAL TROUBLESHOOTING GUIDE
4. SYSTEM PART
Power on
"HELLO"
display on VFD
OK?
YES
4A
IC302
NO
Vcc 3.3 VA
OK?
IC302
pin12, 13, 14
OK?
Replace IC301 MICOM.
CN1100
-29VA,FD-,SW_FD+,5.3VA
OK?
VFD_CLK,
VFD_DATA_OUT,
VFD_ENA_L
OK?
IC1100
data output to VFD
OK?
Replace DIG1100.
3-87
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check 3 VA from SMPS.
Replace X301.
Main Board
Check SMPS and
power on main board.
Check IC301 MICOM.
Replace IC1100
(VFD Driver).
Front Timer Board