Abnormal Sound (Tv)-Main Pcba; Abnormal Sound (Tv) - LG 22LN4000 Service Manual

7. Abnormal sound (TV)-Main PCBA

Abnormal sound (TV)

1
2
3
4
Change Main PCBA
WAVEFORMS
3
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
NO
YES
NO
NO
NO
insult RF cable tight and then
Cable nut screw tight.
If 4.9V is not at plus pin of L706, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Another is change IC706
Check Line between TU401 and IC600
is open or short, Another is change
Check Line between TU401 and IC600
is open or short, Another is change
4
- 16 -
IC600 or TU401
IC600 or TU401
LGE Internal Use Only