No display on VFD, and buttons do not work
No
No
No
Yes
Yes
No display on VFD, and
buttons do not work
Check every supply
voltage on main board is
normal
Refer to Power supply board part
Check the U3’s pin 2,4,8 arrive the
U2’s pin 6,8,9 connect condition
Correct connection
Replace U2 or VFD
Yes
Yes
Yes
No
Check-24V+12V,VCC(
+5v) voltage on the
power and front board
Check the front board
signals SCK,SDA, STB
1.Check whether bad solder exists
on U2 and pins of VFD,
2.Check whether
the circuit
connected to K2, K3, K4, K5, K6,
K8and K9 is broken.
Fix the connection JP1 on front board
and CN1 on power board
Trouble shooting chart
4-1
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Содержание DVDR3435H/93
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