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4-2
The power can not be on or off
Go
Yes
Yes
No
No
The power can’t be
on or off
Yes
Repair the power board
Check the power supply
on the power board is
normal.
Check/Correct connection
Whether the connection
to K301 is broken.
Correct the connection
Replace U1.
No
No
Yes
Yes
Check if the CON301
on the front board to
CN5 on the decoder
board is in good
Whether there is 0V and
3.3V voltage difference on
Pin 100 PCON of U1.
Trouble shooting chart