Read LG 42LB1R (CHASSIS:ML051B) Service Manual online
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NO SOUND
REPLACE JACK BOARD
INSERT CABLES WELL
IS THE SPK CABLE
CONNECTED WELL?
No
CHECK IC302 OR CHANGE
DOES IC302 OPERATE?
No
Yes
CHECK IC301 OR CHANGE
DOES IC301 OPERATE?
No
Yes
CHECK X300 OR CHANGE
DOES IC300 OPERATE?
DOES IC400 OPERATE?
No
Yes
Yes
Yes
CHECK X400 OR CHANGE
No
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