LG CT-25Q40RQ Service Manual page 19

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Is the voltage at
Pin 25, 54 of IC01 3.3V?
Yes
Check pin 24
No
Of IC01(H - Out)
Check &
Yes
Replace
IC01
Check Q402
Collector waveform
No
Check &
Yes
Replace
Q402
Check T401
& each pin voltage
No
Yes
Check &
Replace
T401
Check & Replace
T402
Yes
Is the voltage at pin3,15,45
IC02 5V?
No
Check the
Check &
In/out of
Replace
IC855,IC851
IC01, IC03
NO RASTER
CHECK B+
At D807 cathode
Normal
No
Check the
In/out of
IC06, IC07
No
Yes
No
No
Check the
Voltage at
D860 or D858
cathode
- 19 -
Abnormal
Open
Check
Fuse of AC line
Ok
Check the Voltage
Of C804
254~380 V
Check the Voltage
Pin 3 of IC801
Check / Replace
IC801, IC803, IC802
Check IC01
Pin1 high?
Check / Replace
IC01
No
Check &
Replace
F853 ,F855
Check / Replace
Fuse , DB801
0V
Check / Replace
Fuse DB801