Fld Display Check - LG TH900 Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. FLD DISPLAY CHECK

FLD DISPLAY CHECK
YES
Check
CN202 pin1, 2: 12 V input
voltage.
YES
Check
if both end voltage
of FL+, FL- are over 1.85 V
VH : over 29 V.
YES
Check CN804
connection and DVCC_3.3V of
VDD(C806+).
YES
Check
IC501 -> VFD801
data communication
STB/ DATA/ CLK.
YES
FLD light on?
YES
OK
NO
Refer to SMPS/MPEG
troubleshooting.
Check
NO
DVCC_5V(Q205 & Q204)
VH : Q801, Q802, D801~D804.
NO
Check CN804 connection.
NO
Check data
IC501 pin C2, B3, B1.
3-26
NO
Check each pin voltage.