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LG 29FS4ALX Service Manual page 15

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3) No Raster (2/2)
Check/ Replace
IC501
Check/ Replace
Q402
Check/ Replace
T401
Check/ Replace
Q401
Check the B + at D829
cathode
Normal
Is the voltage each
pin voltage of IC501
Check the in/out of
r e g u l a t o r ( I C 8 2 2 ,
Check pin 73 of
IC823, IC824)
IC501(H_Out)
Check Q402
collector waveform
Check T401 & each
pin voltage
Check Q401collect
waveform
Check & Replace
T402
Abnormal
NO
Check Fuse of AC line
Check the voltage of
C832
Check the voltage
pin4 of IC810
Check/ Replace
IC810, IC802, Q830
NO
Check Fuse and Diode of secondary
Load of SMPS trans(T801)
OK
Check/ Replace IC501
OPEN
Check/ Replace Fuse
OK
NO
Check/ Replace DB801
NO
Check/ Replace Fuse and IC810

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