Sharp LC-22DC30M Service Manual page 32

LC-22DC30M
No PC audio output
Pin (2) of J506: Is L-ch input into the pin (55) of IC3301?
Pin (3) of J506: Is R-ch input into the pin (56) of IC3301?
Are I2S signal output from the pins (80), (81) of IC3301 normally?
Is there audio signal input at pin(6) of IC1701?
Is the L-ch audio signal output at pin(28), (30) of IC1701 normal?
Is the R-ch audio signal output at pin(12), (14) of IC1701 normal?
Are the audio signal L-ch and R-ch output at (3)/(4) and (1)/(2) of
P1701 normal?
Check speakers and their peripheral circuits.
No audio heard (5)
YES
YES
YES
YES
YES
YES
NO Check peripheral circuits of IC3301.
NO Check connection between IC3301 and IC1701 and its
peripheral circuits.
NO Check IC1701 and its peripheral circuits.
NO Check circuit between IC1701 & P1701.
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