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5. HDMI ARC cannot work
Check that [XP1: 1,5pin] of the MAIN PCB is 3.3V.
Yes or no?
YES
Check that [U9 : 5pin] of the MAIN PCB is 3.3V.
Yes or no?
YES
Check that [U8: 5pin] of the MAIN PCB is about
3.3V.
Yes or no?
YES
Replace the old MAIN PCB of the EUT with a new
one.
6. OPTICAL 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 [U8: 5pin] of the MAIN PCB is about
3.3V.
Yes or no?
YES
Replace the old MAIN PCB of the EUT with a new
one.
NO
If pin1 is defective, replace [U5].
NO
Replace the [FB8].
NO
Replace the [FB9].
NO
Reconnect or use a new [8pin cable] instead.
YES
Replace the AU_OPT PCB.
NO
Replace the [FB9].
7. SUB can not work
Check that the wireless pairing LED is lit normally.
Yes or no?
YES
Check that [MAIN(SUB) PCB: FB32] is 3.3V.
Yes or no?
YES
Replace the old MAIN(SUB) of the EUT with a new
one.
8. SUB is interrupted
Remove and re-insert the AC plug.
Yes or no?
NO
Check that the wireless antenna of KEY PCB
[CON201] is connected.
Yes or no?
YES
Replace the old KEY PCB of the EUT with a new
one.
Yes or no?
NO
Replace the old MAIN(SUB) of the EUT with a new
one.
NO
Replace the old MAIN PCB of the EUT with a new
one.
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NO
Check that the AC plug is inserted.
NO
Replace the [FB32].
YES
Reconnect the AC plug.
NO
Reconnect or replace the wireless antenna.
YES
Replace the KEY PCB.
YES
Replace the MAIN(SUB) PCB.
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