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3. BT can not work
Check that module [R123 of MT8516S] is 3.3V.
Yes or no？
YES
Check that the BT antenna is correctly connected
to [CON2 and CON3].
Yes or no?
YES
Replace the old MAIN PCB of the EUT with a new
one.
NO
Replace the new MAIN PCB.
NO
Reconnect the antenna correctly.
4. AUX IN cannot work
Check that the [8pin cable] is connected to the
MAIN PCB.
Yes or no?
YES
Replace the old AU_OPT PCB of the EUT with a
new one.
NO
Check that [XP1: 1,5pin] of the MAIN PCB is 3.3V.
Yes or no?
YES
Replace the old MAIN PCB of the EUT with a new
one.
52
NO
Reconnect or use a new [8pin cable] instead.
YES
Replace the AU_OPT PCB.
NO
If pin1 is defective, replace [U5].
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