Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV CT-29Q90IP 073B-TRO
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Trouble Shooting
Check pin 42 of IC01.
3V
Check / Replace Check the voltage at
Q12,Q851,Q852,Q853,D813 pin 50 of IC01.
3.3V 0V
Check the H-OUT voltage at
pin 50 of ICP(V)01.
Check / Replace Check / Replace
IC1,IC301,FR359,FR360, Q804,Q805,R813,ZD801
D339,D349
Check the voltage of C828(+). Check / Replace
ICP(V)01
33V
Check / Replace Check the voltage at
FR848,D811,R407. pin 2 of FBT.
135V (OPTION)
Check / Replace Check / Replace
D813,L801,IC804,R811,R812. Q401, Q402, T401.
Check the voltage of C834(+).
Check the voltage at Check / Replace
pin 9 of STR.
SW1101,F1101,T801,D801,R802.
18V
Check / Replace Check / Replace
D802,R801,R857. IC801 and the
secondary part of
POWER circuit.
- 19 -
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 12 of P501A. & CPT.
Check the waveform Check the waveform
at pin 26,28,30 of IC702. at pin 24 of TU101.
Check/Replace Check/Replace Check/Replace Check/Replace
IC501,IC701,IC702. CPT PCB ASSY. Q210,Q204,IC201. TU101.
'
Check the waveform
at pin 45 of IC702.
Check / Replace
Check / Replace Q2902,Q2907,Q2908,Q2909
IC702. Q2910,FR2948,VM coil.
- 20 -
DON'T CATCH CHANNEL(MAIN)
Check the voltage at
pin16 of TU101(Main).
Check/Replace
Check the voltage at
FR848,FR829,D811
pin13 of TU101(Main).
R121,ZD101.
Check the waveform at Check/Replace
pin24 of TU101(Main). R124,IC101.
Check/Replace Check the waveform at
IC104 pin12 of P501A.
Check/Replace Check/Replace
IC501,IC701,IC702. IC201,Q204,Q210.
NO PIP / NO DOUBLE WINDOW
Check the voltage at
pin16 of TU102(PIP).
Check/Replace
Check the voltage at
FR848,FR829,D811
pin13 of TU102(PIP).
R121,ZD101.
Check the waveform at Check/Replace
pin24 of TU102(PIP). R124,IC101.
Check/Replace Check the waveform at
IC104 pin6 of P502A.
Check/Replace Check/Replace
IC502,IC701,IC702. Q211.
- 21 -
NO CENTER SPEAKER SOUND
(BUT MAIN SOUND OK)
Check the waveform at
pin 2 of IC660.
Check / Replace Check the voltage at
Q601,Q602. pin 8 of IC660.
0V 5V
Check / Replace Check / Replace
IC660 IC601.
NO WOOFER SPEAKER SOUND
(BUT MAIN SOUND OK)
Check the waveform at
pin 5 of IC650.
Check the waveform at Check the waveform at
pin 26 of IC601. pin 8 of IC650.
NORMAL NO 0V 3V
Check / Replace Check / Replace Check / Replace Check / Replace
Q603. IC601. IC650. IC1,Q606.
- 22 -
Check the voltage
at pin 40 of IC201.
3V
Check / Replace Check the waveform
IC201. at pin 21of IC1.
Check / Replace Check / Replace
Q209,C12. IC2.
Check the voltage
at pin 1,6 of IC301.
Check / Replace Check the waveform
FR359,FR360,D339,D349. at pin 9,10 of P503A.
Check / Replace Check / Replace
IC702. IC301, D301.
Check the waveform
at pin 1 of IC702.
Check / Replace Check the waveform
IC702. at pin 1 of IC401.
Check / Replace Check the waveform
FR448,D413,IC401. at R424.
Check / Replace Check / Replace
Q404,Q405. D402,C408.
- 23 -
NO FRONT L,R SPEAKER SOUND(PICTURE OK)
Check the voltage at
pin 10 of IC610(SOUND AMP).
Check / Replace Check the waveform at
FB882,D885. pin 24,25 of IC601.
* AM Sound(for FRENCH)
Check the voltage at
Check the waveform at
pin 8 of IC610.
pin 47 of IC601.
0V 3V
Check / Replace Check / Replace Check the Waveform
at pin 44 of IC601.
IC610,Q604,Q605. IC1,Q606.
NORMAL NO
Check/Replace Check the waveform
IC601,IC602,X601. at pin 21 of TU101.
Check / Replace Check the waveform at
IC601,IC602,X601. pin 22 of TU101. NO NORMAL
Check / Replace Check / Replace
NO NORMAL TU101. Z103,Q111.
Check / Replace Check / Replace
TU101. Q112,Q113.
Check the waveform at
pin 21,22 of IC601.
Check / Replace Check the waveform at
IC601. pin 1,3 of IC605.
Check / Replace Check / Replace
P604A,H/P JACK. IC605.
- 24 -
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