Philips DVP3880K/55 Service Manual page 22

No display on LED, and buttons do not work
No display on LED, and
buttons do not work
Check whether there is
correct
XS301 and XP5
Check VCC(+5v) voltage
on the power and front
board
Check there are STB, SDA
and SCK signals on XS301
on the front board.
1.Check whether bad solder exists on
U301 and pins of LED,
2.Check whether the circuit connected to
K302, K303 and K301 is broken,
3.Check whether R300, R301 and R302
are open-circuit.
Replace U301 or LED
Yes
contact between
Yes
Yes
Yes
Yes
4-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
No Check the U20's pin 36,37,38
arrive the XP5 connect condition
XP5 (PIN 1 CLK) XP5 (PIN3 DOUT)
No
Correct connection
Trouble shooting chart