Philips DVP5980 Service Manual page 17

No display on VFD, and buttons do not work
Check there are CS, DATA
and
CON301 on the front board.
1.Check
exists on U301 and pins of VFD,
2.Check
connected to K302, K303, K304
and K301 is broken,
3.Check whether R300, R301 and
R302 are open-circuit.
Replace U301 or VFD
No display on VFD, and
buttons do not work
Yes
Check whether there is
correct contact
between CON301 and
CN1
Yes
check-24V+12V,VCC(+
5v) voltage on the
power and front board
Yes
CLK signals on
Yes
whether bad solder
whether the
Yes
4-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
No
J1 (PIN 3 V.SCK)
No
circuit
T rouble shooting chart
Check the U5's pin 97,98,100
arrive the J1 connect condition
J1 (PIN5 VSDA0)
Correct connection