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No display on LED, and buttons do not work
1.Check whether bad solder exists on
U1 and pins of LED,
2.Check whether the circuit connected
to S1, S2,S3 and S4 is broken,
3.Check whether R6, R7 and R8 are
open-circuit.
No display on LED, and
buttons do not work
Yes
Check whether there is
correct
contact
between CON3 and
CN5
Yes
Check VCC(+5v) voltage
on the power and front
board
Yes
Check
there
are
CS,
DATA and CLK signals on
CON3 on the front board.
Yes
Yes
Replace U1 or LED
1-6
No
Correct connection
No
Fix power supply board top
a power supply for should
electric circuit
No
Check the U1's pin 131,132,133
arrive the CN5 connect condition
CN5 (PIN 2 CLK)
No
Correct connection
Trouble shooting chart
CN5 (PIN4 DOUT)
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