LG LH-W551TB Service Manual page 30

Wireless
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E
Check Digital Amp circuit
(IC701, IC702, IC703, IC704)
PWM IC
received correct data
stream?
Normal
PWM IC out?(IC301)
3-7
Check connection between
IC300 ABCK, ALRCK,
ASDAT
Check the related circuit of
PWM.(Check Audio out
Pins52, 54, 55, 59,62, 68

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