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Abnormal
phenomenon
operation
12．The large
screen has no
power, and the
indicator light does
not light up after
power on
13．Black screen
and dark display
backlight
Cause analysis
2. Check whether the intelligent
large screen is in sleep state after
not operating for a long time
3. Check whether the input power
supply is stable
1. Whether the power supply is
powered
2. Whether the power cord is firm
and whether the AC is turned on
1. Screen backlight line short
circuit
2. The power board is broken
Terms of settlement
2. Set the smart screen never to
sleep
3. Plug in and out the input power
supply
4. Re -upgrade the software
5. Replace the new machine
1. Plug the power cord again, turn
on the AC, and then power on
2. Replace the new machine
1. Replace the new machine
6
again
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