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Trouble Shooting
Not start
Check power
No
Is Power board 3.3V
board
STB, 12V normal?
Yes
Only3.3V
YES
Check if every DC-DC
No
Check every
Shift module has
DC-DC module
output. Does main IC have
Check if main chip
power supply or not
Output Pow-ON, Dim,
BL-ON Signal to
Yes
Main IC reset signal
power board
Check the U700(main IC)
No
Peripheral components
/ upgrade main software /
IIC bus signal
check whether it connect
ground well /
Crystal work or not
Check UART LOG
Yes
Replace U501/U700
24
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