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Tuner FM does not work
Tuner FM does not work
Check voltage at Q27:+3.3V on Main
Board whether normal or not
Check voltage +5V
module (TUN1 pin5) whether right or
not
Yes
Check
pin7,pin8,pin9,I2S output
normal or not
Yes
Check the U4. I2C output on Main
Board whether normal or not
Yes
Replace Main Board
Go
Yes
at Tuner
Tuner
module
whether
5-7
No
Refer to Power Board CN502
No
Check Main Board tuner power supply
circuit.
No
Change the Tuner module
No
Check
Main
supply circuit
Trouble shooting Chart
Board
U4
power
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