Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV CT-25K90VE MC022Ats
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TROUBLE SHOOTING
RF- STEREO
Selected correct system
In menu
OK
Check the waveform NO Check / Replace
At pin 17 of TU101 TU 101
OK
NO NO
Check the waveform Check The Voltage Check The voltage
At pin 24,25 of IC661 At pin 16,33,46, of IC661 At pin of IC610, IC853
OK NO
Check the waveform NO
Check / Replace Check / Replace
At pin 4,12 of IC602 Q671, 672 IC610, IC853
OK
Check the Voltage NO Check / Replace
At pin 6, 7 of IC602 Q621, IC603
OK
Check the waveform
At pin 1, 2, 14, 15 of IC602
OK
Check the Voltage NO Check / Replace
At pin 3,13 of IC602 F851, D862
No Raster / Sound OK
Check the
Heater voltage of CPT
(6 ~ 6.5Vrms)
OK NO
Check Check Check the
HV, Screen Voltage of IK Current of Heater pulse of FBT
CPT IC01, pin37,39,40 T402
NO OK NO OK NO
Check / Replace Check Check
CPT Board FR901, P402A FBT T402
Components P402B, P302
Check
Check
IC01, Q901, IC901
FBT T402
P03A, P03B, P541
- 18 -
NO RASTER
CHECK B+
At D807 cathode
Normal Abnormal
Is the voltage at Open
Check
Pin 25, 54 of IC01 3.3V? Fuse of AC line
No
Yes Check / Replace
Ok
Check the Fuse , DB801
Check pin 24 In/out of Check the Voltage
No Of IC01(H - Out) IC06, IC07 Of C804
0V
Check &
Yes 254~380 V
Replace Check / Replace
IC01 Fuse DB801
Check Q402 Check the Voltage
Collector waveform Pin 3 of IC801
No
Check & Yes
Replace
Check / Replace
Q402
IC801, IC803, IC802
Check T401
& each pin voltage
No
Yes No
Check & Check IC01
Replace Pin1 high?
T401 Check & Replace
T402
Yes Check / Replace
IC01
No
Yes Is the voltage at pin3,15,45
IC02 5V?
No
No Check the No Check &
Check & Check the
In/out of Voltage at Replace
Replace
IC855,IC851 D860 or D858 F853 ,F855
IC01, IC03
cathode
- 19 -
No Picture / No Sound
Is any OSD displayed?
No OK
OK
OK Check IC01 pin37,42,43,44 Check receiving system in MENU
(IK, R,G,B) & execute Auto - Program.
No Does the auto - Program
Operate properly.
Check / Replace OK
IC01
Store on manual - program MENU
Check
No Check 5V, 33V & IIC Bus Line
5V, 33V & Go to
IIC Bus Line Of Tuner.
No Sound /
OK Picture OK
No Is the CVBS signal OK.
Check / Replace
IC01, Tuner (IC01 pin10 or 22)
OK
OK No
Check Check IK Check R,G,B signal
CVBS signal Line Signal at At IC01, pin42,43,44
& IC01 IC01 pin37
(similar to CBVS)
OK
Check / Replace
CPT Board component
- 20 -
AV Stereo
Select correct system
In menu
OK
OK
Check the connection
Of AV equipment
AV Check the the waveform NO
At pin47 of IC661 Check TU101 Tuner
OK OK
NO
Check the waveform Check the voltage
At pin 24, 25, of IC661 Of pin16,20
OK
NO
Check waveform Check / Replace
At pin 4, 12 of IC602 IC602
OK
NO
Check the voltage Check / Replace
At pin6,7 of IC602 Q621, IC603
OK
NO NO Check /Replace
Check the waveform Check the vpltage
At pin 1,2,14,15 of IC602 At pin3, 13 of IC602 F851, D862
OK
Replace IC 602
- 21 -
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