LG CF-21Q20EH User Manual

Trouble Shooting
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Check pin31 of IC01
Check the voltage of C402(+) Check the voltage at
pin2 of FBT
Check the H-Out voltage
at pin24 of IC01
Check & Replace
F854,D861,R405,R423
Check the voltage
at pin2 of FBT
Check & Replace
IC01,FR403,R413,
D405,D406,IC301,
IC01
Check the voltage of C804(+)
Check & Replace
SW1111,F1111,T801
D862,866,867,868
Check & Replace
T802, R809, D802.
Z 18V
Check & Replace
Q401, Q402, T401.
110 V
33V
Check & Replace
D850, L853, T402.
Check the voltage at
pin 54 of IC01.
3.3V 0V
Check & Replace
IC853(3), FR406,
D408,D858,Q856
Check & Replace
Q05, IC851, IC802(3), IC856
No Power ON(SMPS working)
No Power(Not working SMPS)
130~380V 0V
0V
Check the voltage
at pin4 of STR
Check & Replace
IC801 and the
secondary section
High Low(=0V)
0V
0V
NORMAL NO
Check & Replace
FR403,FR413,D405,D406
Check & Replace
IC01
Check the voltage
at pin1,6 of IC301
Check the waveform
at pin35 of IC01
Check & Replace
IC301,D301
No Vertical Deflection
0V +14V,-14V
No Yes
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LG CF-21Q20EH Specifications

General

Brand	LG
Model	CF-21Q20EH
Category	TV
Language	English