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No display , and buttons do not work
No display on LED DISPLAY, and
buttons do not work
Check
voltage on main board is
normal
voltage on the power
Check the signals of the PU4's
DATA,CLK,STB,on the power board
1.Check whether bad solder exists
on PU4 and pins of LED DISPLAY
2.Check
connected to PK1, PK2 is broken.
Replace PU4 or LED DISPLAY
Go
every
supply
Yes
Check +5V,+12V,
board
Yes
Yes
whether
the
circuit
No
5-1
No
Refer to Power supply board part
No
Fix the power board
No
Check the PU4 power supply
(PU4.7= +5V and PU4.21= +5V)
Yes
Correct connection
Trouble shooting chart
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