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No display on VFD, and buttons do not work
No display on VFD, and
buttons do not work
Check
voltage on main board is
normal
Check-22Vstb(-22V),5
Vstb(+5v) voltage on
the power and front
board
Check the front board
signals SCK,SDA, STB
1.Check whether bad solder exists
on U3 and pins of VFD,
2.Check
connected to K1, K2, K3, K4, K5,
K6 is broken.
Replace U3 or VFD
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4-1
Yes
every
supply
Yes
Yes
Yes
whether
the
circuit
Yes
No
Refer to Power supply board part
No
Fix the connection JP4 on front board
and CN6 on power board
No
Check the U2's pin 2,4,8 arrive the
U3's pin 6,8,9 connect condition
No
Correct connection
Trouble shooting chart
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