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No display on LED, and buttons do not work
LED light or buttons do
not work
Check
voltage on PSU, main
board and front board is
normal
Check whether every pin of
XP1 on PSU board connects
well to main board ,XP3
connects well to front board
1. Check whether any bad component
or soldering exists on PSU board, main
board and front board
2. Check whether the circuit connected
to the keys is broken.
Replace the LED light , or the whole LED
board
Go
every
supply
Yes
Yes
No
5-1
Fix the open circuit or short circuit
No
which may exist on PCBs and
cables
No
Fix XP1 or XP3
Yes
Fix the PCB or bad component
Trouble shooting chart
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