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The power can not be on or off
The power can't be
on or off
Go
Check the power supply
on the power board is
normal.
Yes
Check if the XS301 on the
front board to XP5 on the
decoder board is in good
contact.
Yes
Whether the connection
to K303 is broken.
Yes
Whether there is 0V and
3.3V voltage difference on
Pin 39 PCON of U20.
Yes
4-2
No
No
Yes
No
No
Repair the power board
Check/Correct
connection
Correct the connection
Replace U20.
Trouble shooting chart
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