LG LST-4200A Service Manual - Page 28

Fig.02, Fig.01

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(A) YES Are the power 2.5V supplied to pin NO 21 and 3.3V to pin9? YES Is the power 3.3V supplied to pin 38 of IC103, NO IC104 and to pin 1of IC107, IC108? Check power bus. IC503 : 2.5V / IC501 : 3.3V Check power bus. IC503: 3.3V (B) YES Does crystal of X100 generate NO 10MHz? YES Is clock of pin 28 of IC110 outputted NO at 60MHz? Check X101. Check IC110. Fig.01 Fig.02 3-19

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3-19
Are the power 2.5V supplied to pin
21 and 3.3V to pin9?
(A)
Is the power 3.3V supplied to pin 38 of IC103,
IC104 and to pin 1of IC107, IC108?
YES
YES
Check power bus.
IC503 : 2.5V / IC501 : 3.3V
NO
Check power bus. IC503: 3.3V
NO
Does crystal of X100 generate
10MHz? <Figure .01>
(B)
Is clock of pin 28 of IC110 outputted
at 60MHz? <Figure .02>
YES
YES
Check X101.
NO
Check IC110.
NO
Fig.02
Fig.01