Electrical Troubleshooting Guide - LG TL-AT130M Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power Circuit(SMPS)
(1) No 5.3 A
No 5.3V
Is F101 normal?
YES
Is BD101 normal?
YES
Is R101 normal?
YES
Is there Vcc (about 13~19V) at
IC101 pin 5?
YES
Is D106 normal?
YES
Is there about 2.5V at
IC103 pin 1?
YES
Is D109 normal?
YES
Is L103 normal?
YES
Check the power terminal at main
PCB short.
SECTION3 ELECTRICAL
NO
Replace F101(Use a specified
fuse).
NO
Replace BD101.
NO
Replace R101.
NO
Is D103 normal?
NO
Check/
Replace D103
NO
Replace D106.
NO
Replace IC103.
NO
Replace D109.
NO
Is L103 normal?
(2) No 9V
No 12V
Is D109 normal?
YES
Is Q170 normal?
YES
Is D110 normal?
YES
Is Q152 normal?
YES
Check/ Replace Q163
(3) No 24 V
No 24V
Is D110 normal?
YES
Is Q159 normal?
YES
Check 'H' signal at Q161
Base terminal
3-2
NO
Check/Replace D109
NO
Replace Q170
NO
Replace D110
NO
Replace Q152
NO
Check/Replace D110
NO
Check/Replace Q152