Power Board - Philips MDV434/55/77 Service Manual

The power can not be on or off
The power can't be
Check the power supply
on the power board is
normal.
Check if the CON2 on the
front board to CN6 on the
decoder board is in good
contact.
Whether the connection
to K301 is broken.
Whether there is 0V and
3.3V voltage difference on
Pin 100 PCON of U3.
on or off
Go
Yes
Yes
Yes
Yes
Yes
4-2
No
Repair the power board
Check/Correct
No
connection
No
Correct the connection
No
Replace U3.
Trouble shooting chart