LG TL-AT130M User Manual

Page 13

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3-3

(4) No 5.2 A (TO AVCP, BIAS)

(5) No 10V

Is there voltage (about 0V)

at Q157 collector.

NO

NO

YES

YES

Is Q170 normal?, Is there about

13.5V at Q107 Base?

Check/ Replace

D155, D156, D157/\.

Replace D106.

NO

Replace Q153.

Replace Q157.

No 5.2V

Is D106 normal?

Replace D109

No 10V

Is D109 normal?

YES

Is Q153 normal?

YES

Check/

Replace Q156

YES

NO

Check/ Replace

Q107, ZD103

NO

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

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