Fld Display Check - LG FA162 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

2. FLD DISPLAY CHECK

FLD display check
Check
CN103 Pin1, 2, 3
power.
YES
F1+, F2- both terminals: over 3.7 V
Check power VKK: over -30 V.
YES
Check
CN102 connection
condition and power F1+, F2-
both terminals: over 3.7V
Check power VKK: over -30V
Check Pin25: 3.3VA
YES
Check
IC301 MC3501 power
Pin50 VKK : -30 V
Pin9, 51 : +3.3 VA
YES
Check
IC101 --> IC301
DATA communication
Pin3 --> Pin3 STB
Pin2 --> Pin2 DO
Pin4 --> Pin1 CLK
YES
FLD light on?
YES
OK
NO
Refer to
SMPS troubleshooting.
NO
Check CN102 assembly.
Check
power of each Pin.
OK
When 3.3 VA fails,
NO
check D100 SDB0540 input
and output power.
Check
the related part.
OK
IC100 Pin3 --> Pin3 STB
NO
Pin4 --> Pin1 CLK
Check data output.
Check
Pin2 --> DO --> DATA input.
Check
the related part.
OK
3-7
YES
NO
YES
YES
NO
YES
YES
YES
NO
YES
Replace the related part.
Replace the related part.
Replace the related part.