Philips DVP3126 Service Manual page 16

No display on LED, and buttons do not work
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No display on LED, and
buttons do not work
Yes
Check whether there is
correct contact
between CON301 and
CN5
Yes
Check VCC(+5v)
voltage on the power
and front board
Yes
Check there are CS, DATA and
CLK signals on CON301 on the
front board.
Yes
1.Check whether bad solder exists
on U301 and pins of LED,
2.Check whether the circuit
connected to K302, K303, K304
and K301 is broken,
3.Check whether R300, R301 and
R302 are open-circuit.
Yes
Replace U301 or LED
manuals search engine
4-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
Check the U1's pin 131,132,133
No
arrive the CN5 connect condition
CN5 (PIN 2 CLK) CN5 (PIN4 DOUT)
No
Correct connection
Trouble shooting chart