Philips DVP3111/12 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
BarthService