LG HT904TA Service Manual page 20

E
YES
Normal Audio
output when disc
playback?
YES
TEST END.
PWM IC
NO
received correct data
stream?
YES
Normal
PWM IC out?(IC601).
YES
Check Digital Amp circuit
(IC701, IC702, IC703, IC704).
2-
Check connection between
NO
IC601 BCK, LRCK, ADATA0,
ADATA1, ADATA2(Pins19, 20,
23, 24, 25).
Check the related circuit of
NO
PWM.(Check Audio out
Pins 54, 55, 58, 59, 61, 62, 67,
68, 70, 71, 74, 75)