LG OK75 - Electrical Troubleshooting: FLD Display Check

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3. FLD DISPLAY CHECK
ELECTRICAL TROUBLESHOOTING GUIDE
FLD DISPLAY CHECK
OK
Check DVCC_5V
VH : Q801, Q802, D801~D804.
Check CN804 connection.
Check data
IC501 pin C2, B3, B1.
Check each pin voltage.
FLD light on?
Refer to SMPS/MPEG
troubleshooting.
Check
CN201 pin1, 2: 12 V input
voltage.
Check
if both end voltage
of FL+, FL- are over 1.85 V
VH : over 29 V.
Check CN804
connection and DVCC_3.3V of
VDD(C806+).
Check
IC501 -> VFD801
data communication
STB/ DATA/ CLK.
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES