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5-6
No display on LED, and buttons do not work
No
No
No
Yes
Yes
No display on LED, and
buttons do not work
Check whether there is
correct contact between
XS301 and XP1
Correct connection
Fix power supply board top
a power supply for should
electric circuit
Check the U2’s pin 48,95,96 arrive
the XP1 connect condition
Correct connection
Replace U301 or LED
Yes
Yes
Yes
No
Check VCC(+5v) voltage
on the power and front
board
Check there are CS, DATA
and CLK signals on XS301
on the front board.
1.Check whether bad solder exists on
U600 and pins of LED,
2.Check whether the circuit connected to
K301,K302,is broken,
3.Check whether R303,R301,R302 are
open-circuit.
Trouble shooting chart
XP1 (PIN 1 CLK) XP1 (PIN3 DOUT)