5-1 Trouble shooting Chart
Yes No
Yes
Yes
Power on Doesn't Work
Go
NO
Yes
Check the 3.3V voltage of MCU
Yes
Yes
No
Confirm the normality SPI
communications of MPEG
Adapter has problem
Check the 22V voltage of XP1 and
XP8
Check 9pin and 24pin of MCU
and confirm whether they have normal
voltage
Confirm whether there are DVCC33 and
VC12
NO
Check the VCC5V out from
DC-DC
No
MPEG has problem
Check VFD board and key board
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