LG LHB976 Service Manual page 121

MAIN SET TROUBLESHOOTING
Tuner function
YES
IC200
pin11, 12 audio L/R
OK?
YES
IC201
pin13, 14, 15 I2S 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 tuner module or replace.
NO
Check IC200 or replace.
NO
Check IC201 or replace.
NO
Check CN401 or replace.
2-106