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 S1 is broken.
Correct the connection
Replace U3.
No
No
Yes
Yes
Check if the CN1 on the
front board to CN2 on the
decoder board is in good
contact.
Whether there is 0V and
3.3V voltage difference on
Pin 62 POWER_K of U3.
Trouble shooting chart
