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ELECTRICAL TROUBLESHOOTING GUIDE
Tuner abnormal
YES
YES
Check U604
pin1,12 signal.
NO
YES
Check U604
pin3, 13 signal.
NO
Check U604.
YES
CHECK U604 PIN10.
YES
Check
TU1 pin1, 2.
NO
YES
Check TU1.
YES
Check U602
pin1, 2 signal.
NO
YES
Check U603
pin1, 7 signal.
NO
YES
Check U603
pin3, 5 signal.
NO
Check R644, R645.
3-6
Check R110, R111.
Check TU1 data signal
pin4 "TUNER_CLK",
pin5 "TUNER_SDIO",
pin6 "TUNER_SEN",
pin7 "TUNER_RST".
Check U602
YES
pin12 "DAC_BCK",
pin10 "DAC_LRCK",
pin9 "DAC_DATA",
pin11 "DAC_MCLK"
data signal.
NO
Check U602.
Check R634, R635.
Check U603.
Normal.
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