Trouble shooting chart | ||
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No display on LED, and buttons do not work
No display on LED, and buttons do not work
Yes 
Check | whether | there is | No | |
correct | contact | between | ||
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XS301 and XP1
Yes 
Check VCC(+5v) voltage | No |
on the power and front |
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board |
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Yes 
Correct connection
Fix power supply board top a power supply for should electric circuit
Check there are CS, DATA | No |
and CLK signals on XS301 |
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on the front board. |
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Check the U2’s pin 48,95,96 arrive the XP1 connect condition
XP1 (PIN 1 CLK) | XP1 (PIN3 DOUT) |
Yes
1.Check whether bad solder exists on |
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U600 and pins of LED, | No | |
2.Check whether the circuit connected to | ||
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K301,K302,is broken, |
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3.Check whether R303,R301,R302 are |
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Yes
Replace U301 or LED
Correct connection