LG RT-21FD90VQ User Manual

TROUBLE SHOOTING
- 12 -
RF- STEREO MODEL
Selected correct system
In menu
Check the waveform
IF 1 of TU101
Check the waveform
At pin 4, 5 of IC11
Check the waveform
At pin 6 of IC601
Check the waveform
At pin 2, 4 of IC601
Check the waveform
At pin 8, 9, 11, 12 of IC601
Check the waveform
At pin 5, 6 of IC601
Check / Replace Q601
Check The voltage
At pin of IC821, IC822, Q807
Check / Replace
C821, IC822, Q807
Check The Voltage
At pin 2, 19,20,21, 24 of IIC11
Check / Replace
TU 101
Check / Replace
F806, D828(D805)
OK
OK
OK
OK
OK
OK
NO
NO NO
NO
NO
NO
No Raster / Sound OK (1/ 2)
Check the
Heater voltage of CPT
(6~ 6. 4Vrm s)
Check
HV, Screen Voltage of
CPT
Check the
Heater pulse of FBT
T402
Check
R, G, B out of
CPT Board
Check
FBT T402
Check 185V line of CPT
Board & if no problem
check and Replace
Check
IC901, P903A
Check
RF901, P402
P402B,FR401
Check
FBT T402
PICTURE O.K / NO SOUND

LG RT-21FD90VQ Specifications

General

Brand	LG
Model	RT-21FD90VQ
Category	TV
Language	English