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No display on LED, and buttons do not work
No display on LED, and
buttons do not work
Check XP3 pin14
It should be 5V
Check the front board
signals
(XP3 : pin9,10,11)
1.Check
whether bad solder exists on
U301 and pins of LED
2.Check whether the circuit
connected to S608, S609,
S610, S611 are broken.
Replace U301 or LED
Yes
Yes
VSCLK,VSDA,VSTB
Yes
the
LED
board
Yes
5 - 1
Check Q751 in
No
main board
No
Check the main board SPI signal
(U20 :pin17,18,19)
NO
Replace Main Board
No
Correct connection
Trouble shooting chart
NO
Replace Q751
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