LG 42LV4400 Service Manual page 71

(TV_SIDE, AUDIO) IS NOT DISPLAY CORRECTLY
Start
Input signal good?
Input correct?
Check signal correct?
Check amplifier OK?
–
CONFIDENTIAL DO NOT COPY
N0
Yes
N0
Yes
N0
Yes
N0
Yes
END
1. Check Audio source
2. Check the player of source
1. Check signal of Main Board
2. Check amplifier (U51)
1. Check MT5387 audio out ,R838
& R839
1. Check 12V of U51
.
Page 9-7
File No. SG-0000034