Philips DVP3111 Service Manual page 17

No display on LED, and buttons do not work
LED and
buttons do not work
Check whether there is
correct
between CON1 of front board
and J 6 of decoder board
Check
voltage on the power
and front board
Check
or 3.3V on the signals of VPLAY,STB
CLK, DATA
Check
connected to LED & BUTTONS
is broken,
Check wether Q1,Q2,Q3,Q4 for 3904
&LED is broken,
Replace LED or Q1,Q2,Q3,Q4
Yes
contact
Yes
DV33(+3.3V)
Yes
whether there is 0V
Yes
whether the circuit
Yes
5-9
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
No Check the U2's pin 33,34,40,41 arrive
the J 6 connect condition
No
Correct connection
Trouble shooting chart