4. FUNCTION MODE AUDIO ABNORMAL
AUX abnormal
Check the input signal of CON102 Pin6, 8.
Check the input signal R317, R318.
Check the input signal JK302 Pin2, 4.
YES
NO
Check
the input signal of IC700
Pin11, 4.
YES
NO
NO
Tuner abnormal
Check
C580,C581,R515,R516,R717,R718,C751,C753.
Check the input signal of IC700 Pin12, 1.
Normal.Check the VCC of power circuit.
NO
YES
NO
NO
YES
Check
the output signal of TU400 Pin5, 6 to
U401 Pin1, 2.
Check TU400/ U401
Pin4 “Tun_SCLK”, Pin5 “Tun_SDIO”, Pin7 “Tun_RST”.
YES
YES
Check VCC of TU400/ U401 Pin3?
OK
3-6
ELECTRICAL TROUBLESHOOTING GUIDE
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