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A
No sound from the speakers
No sound from the speakers Yes Is sound muting set? No Is the volume set to "0"? Yes Raise the volume then check again. Is it only the FRONT input sound that doesn't come out? Yes Yes Is a signal input to IC4401? (pin 1), (pin 3) Yes Check the communications No around the FE (U4401 or U4402) and between the FE (U4401 or U4402) and the microcomputer. Check around IC4402 and No check the communications between IC4402 and the FE. Is the flexible cable between No Connect Flexible cable, CN4001 and CN7804 then check again. connected normal? Yes Is a signal input to IC4801? (pin 25), (pin 26) No Yes Cancel muting then check again.
B
No Is it the only TV sound that doesn't come out?
No
C
Is a signal input to IC4402? (pin 7) Yes
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Is it only HDMI sound that doesn't come out? Yes
No
Is a signal output from IC4402? (pin 22), (pin 23) Yes
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Check the communications No around the IC4402 and between the IC4402 and the microcmputer.
Is a signal output from IC6405? (pin 7), (pin 8) Yes
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around IC6405 and No Check the communication check between IC6405 and the microcomputer.
D
Is a signal input to IC4801? (pin 19), (pin 20)
35
Yes Is a signal output from IC4801? (pin 35), (pin 36) Yes Is a signal output from CN4005? (pin 35), (pin36) Yes
No Check the communication between IC4402 and IC4801.
Is a signal input to IC4801? (pin 10), (pin 11)
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Yes
No Check the communication between IC6405 and IC4801.
Check around IC4801 and No check the communications
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between IC4801 and the microcomputer.
Is it the only input REAR input analog sound that doesn't come out? Yes Is a signals input to IC4801? No Check the communication between the jack and IC4801.
E
No Check the communication between CN4005 and CN1402.
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Has the signal come to CN7201? (pin 13), (pin20) Yes Has the symptom been settled when the system cable is replaced? Yes Finishing troubleshooting No The panel is defective. No Check the communication between CN7201 and IC4801. Yes
