Philips DVP520 Service Manual page 11

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 FFC CN303
on the front board to CN5
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 68 of U4.
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on or off
Go
Yes
Yes
Yes
Yes
Yes
4-2
No
Repair the power board
Check/Correct
No
connection of FFC
CN303
No
Fix connection
No
Replace U4.
Trouble shooting chart