LG LPA-172G, Service Manual

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3-17
E
Normal Audio output
when disc playback.
Normal Audio DAC out. (4U3)
Audio DAC received correct
data stream.
Check Audio filter, amplify,
mute circuit.
Normal IR. VFD & Front
pannel key functions.
TEST END
Communications between IR.VFD
Front pannel key & MT1389 &
Front u-com is normally.
Check the cable connection
on Front pannel.
C.
Check connection between
MT1389 & Audio DAC. (Check
VRST#, ACLK, ABCK, ASDAT3)
NO
Check the related circuit of
Audio DAC.
Check communi cation lines
On MT1389
NO
NO
NO
NO
YES
YES
YES
YES
YES