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No display on LED, and buttons do not work
1.
component or soldering exists on
LED board,
2.
connected to the keys is broken.
Replace the LED driver IC, LED, or the
whole LED board
No display on LED, and
buttons do not work
Go
Check
every
supply
voltage on PSU, main
board and LED board
Yes
Check whether every pin
of XS1 on KEY board
connects well to main
board
Yes
Check
whether
any
Check
whether
the
circuit
Yes
4-1
Fix the open circuit or short circuit
No
which may exist on PCBs and
cables
No
bad
No
Trouble shooting chart
Fix XS1
Fix the PCB or bad component
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