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No display on LED, and buttons do not work
No display on LED, and
buttons do not work
Check whether there is
correct
XS301 and XP82
Check VCC(M5V) voltage
on the power and front
board
Check there are STB, SDA
and SCK signals on XS301
on the front board.
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 R1, R3 on front board
and R81,R82 and R83 on MEPG board
are open-circuit.
Replace U301 or LED
Yes
contact
between
Yes
Yes
Yes
Yes
4-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
Check the U1's pin 34,35,39 arrive
No
the XP82 connect condition
XP82 (PIN 4 CLK)
XP82 (PIN6 DOUT)
No
Correct connection
Trouble shooting chart
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