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Fist check the fuse on the inverter board if it is blown replace it if not you need another inverter board as it has fried. But I looked and was unable to find a new/replacement inverter online so I wish you the best of luck
The problem seems to be with the monitor.When there is no Display,if you power-off and on again do you get a Benq Startup screen?If not the problem should be dry solder on the Invertor board.Try tapping screen lightly,if it comes on the problem is dry solder on Invertor board.
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IT seems you are not technically trained in electronics.In this case it's difficult to explain via this board,Best you find someone to fix it for you,you can try contacting Benq Support locally.
Sorry for not being able to help.