Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV RT-29FB20RB MC021ATS
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TROUBLE SHOOTING
Check pin 2 of P005A.
1V
Check / Replace Check the voltage at
Q871,Q852,Q854, pin 10 of P004A.
IC803,IC851
2Vp-p 0V
Check the H-DRV voltage at
pin 5 of P214A.
Check / Replace Check / Replace
IC001,Q002. FR359,FR360,D339,D349,IC301.
5.5Vp-p 0V
Check the voltage of C404(+). Check / Replace
IC1113.
67V
Check / Replace Check the voltage at
R407,D861,FB854. pin 2 of FBT.
135V
Check / Replace Check / Replace
R865,R864,L853,D850,FB856. Q401, Q402, T401.
Check the voltage of C821.
Check the voltage at Check / Replace
pin 4 of STR. SW1101,F1101,T1101,
DB814,TH810.
17.8V
Check / Replace Check / Replace
R809,D802,R803,R810. IC801 and the
secondary part of
POWER circuit.
- 14 -
Check if heater element is lighting.
Check the heater voltage.
Check/Replace Increase the screen
FR442,R910. voltage of FBT.
Check/Replace
CPT. Retrace line is Screen is black.
visible.
Check the waveform Check FBT & CPT socket
at pin 3 of ic901,902,903 & CPT.
NO YES
Check the waveform
Check the waveform
at pin 62,63,64 of IC501S.
(RGB out) at pin 7 of IC901,902,903.
YES NO NO YES
Check/Replace Check the waveform Check/Replace Check/Replace
Q503,504,505. at pin 20,21,22 of IC501S. IC901,902,903. IC101.
YES NO
Check/Replace Check the waveform
IC501S. at pin 2,76,79 of IC101S.
YES NO
Check/Replace Check the waveform at
IC401S,FL201S,202S,203S. PIN52 of IC101S.(CVBS1)
YES NO
Check/Replace Check the waveform at
IC101S. Pin2 of P213A.(Vmain)
YES NO
Check/Replace Check the waveform at
IC201S. TU101,Q108.
- 15 -
Check the voltage at pin3,13
of IC652(SOUND AMP).
18V
D850,F851.
7
2.5V 0V
CHECK/REPLACE CHECK/REPLACE
IC601,Q650. Q651.
CHECK/REPLACE
TU101.
Check the waveform
at pin 11 of P901B.
NORMAL
Checkthe waveform at
Q501,IC501S. pin10 of HIC951.
Check the Vcc at pin11(135V).
Check the Vcc at pin4(12V).
PIN CUSHION
47 IC501S.
IC501S. IC302
IC302 R424.
Q404, Q405. D402.
- 16 -
Check the waveform at
pin 21,22 of IC601.
YES
Check / Replace Check the waveform at
IC601. pin 1,3 of IC602.
YES
Check / Replace Check / Replace
H/P JACK. IC603.
DON'T CATCH CHANNEL(MAIN)
Check the voltage at
pin9 of TU101.
Check/Replace Check the voltage at
R403,FB854,D861,ZD102. pin13 of TU101(5V).
Check the waveform at Check/Replace
pin19 of TU101(Video). IC854,F856.
Check/Replace Check the waveform at
TU101. pin2 of P213A.
Check/Replace Check/Replace
IC201S,IC101S. Q108,C114,R119.
Check the voltage at Check the voltage at
pin 14 of TU101. pin 14 of T101.
2.5V 0V
CHECK/REPLACE CHECK/REPLACE CHECK/REPLACE
CHECK/REPLACE
TU101. IC001,IC007. IC001,IC007.
TU101.
- 17 -
Check the waveform
at pin 2 of P004A.
NO YES
Check the waveform at Check the waveform at
pin4 of P213A(CVBS) pin21 of IC001(CVBS)
Check the voltage
at pin 1,6 of IC301.
Check / Replace Check the waveform
FR359,FR360,D339,D349. at pin 52,53 of IC501S.
Check / Replace Check / Replace
IC501S,R540,R541. IC301, D301.
NO DVD/COMPONENT PICTURE
Check Y,Cb,Cr signal
input from JA201.
YES
Check the waveform at pin46,47,48 of IC101S.
(From comp1,480i input)
Check the waveform at pin1,2,3 of IC401S.
(From comp1,480p/1080i input)
Check the waveform at pin7,8,9 of IC401S.
(From comp2,480p/1080i input)
NO YES
Check/Replace Check the waveform at
Q301,302,303,304,305,306. pin25,26,27 of IC401S.
NO YES
Check / Replace Check the waveform at
IC401S. pin 62,63,64 of IC501S.
NO YES
Check / Replace Check / Replace
IC501S Q503,504,505,CPT Board.
- 18 -
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