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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
correct
XS2 and XP1
Yes
Check VCC(M5V) voltage
on the power and front
board
Yes
Check there are STB, SDA
and SCK signals on XS2 on
the front board.
Yes
1.Check whether bad solder exists on
U301 and pins of LED,
2.Check whether the circuit connected to
K302, K303 and K301 is broken,
3.Check whether R303, R304,R305 on
front board and R97,R98 and R93 on
MEPG board are open-circuit.
Yes
Replace U301 or LED
contact
between
4-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
Check the U1's pin 17,18,19 arrive
No
the XP1 connect condition
XP6 (PIN 2 CLK)
XP6 (PIN4 DOUT)
No
Correct connection
Trouble shooting chart
Free Datasheet http://www.datasheet4u.net/
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