LG LST-3100A Service Manual page 18

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(2) Check IC112 and Surroundings

59V is supplied to IC112(8)?

YES

Analog audio signal is output from

IC112(1, 7)? Fig. 05

(3) Check Q102, Q103, Q109, Q110 and Surroundings

9V is supplied to Q102, Q103,

Q109,Q110(3)?

YES

Analog audio signal is output from

Q102, Q103, Q109, Q110(1)? Fig. 06

(4) Check Output Jack and Surroundings

Check CN300(VARIABLE_ L, VARIABLE_ R, MONITOR_ L, MONITOR_ R)

And their surroundings

Fig. 05 Analog Audio Signal

Check Power Supply Part

Check IC112 and surroundings

Check Power Supply Part

Check Q102, Q103, Q109, Q110 and

surroundings

3-9

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