LG LST-4200A Service Manual - Page 29

Fig.04, Fig.03

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(C) YES Is IC100 reset signal normally NO outputted? YES Is pin 4 reset signal of IC101 NO generating? YES Is reset signal generating at NO pin 93 of IC110? YES Is reset signal generating at pin 10 of IC104 NO when pressing power key? Check IC100. Check IC101. Check IC110. Check IC101. Fig.03 Fig.04 3-20

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3-20
Is IC100 reset signal normally
outputted?
(C)
Is pin 4 reset signal of IC101
generating?
<Figure .03>
Check IC100.
NO
Check IC101.
NO
YES
YES
Is reset signal generating at
pin 93 of IC110?
Check IC110.
NO
YES
Is reset signal generating at pin 10 of IC104
when pressing power key? <Figure .04>
Check IC101.
NO
YES
Fig.04
Fig.03