LG LHB976 Service Manual page 122

MAIN SET TROUBLESHOOTING
BD / CD / DVD disc or USB play
YES
IC511
pin4, 6, 8, 17 I2S input signal
OK?
YES
R446, R447,
R448, R432 I2S Input signal
OK?
YES
R423,
R422, R424 output signal
OK?
YES
IC401
pin23, 24, 26, 27, 29, 30 signal
OK?
YES
CN401
pin13, 14, 15 signal
OK?
YES
Update new wireless, μ-COM firmware.
NO
Check IC500 or replace.
NO
Check IC511 or replace.
NO
Check IC401 or replace.
NO
Check IC201 or replace.
NO
Check CN401 or replace.
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