Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
SOURCE: benq lcd tv
Hi zippie, Based on your post/description, I am inclined to suspect the backlight which is actually a CCF a small fluorescent tube about 2mm diameter the width of your display either at the very top or bottom of the screen. At times it can also be the inverter circuitry that powers up the said tube. One way is to run your PC and display as if nothing is wrong giving it a minute or soto finished booting everything. If looking closely you will notice semblance of your desktop albeit very faint, very dark or using a flashlight provide illumination to the display at an angle and the display is there, then chances are it is the backlight. Otherwise, it can be the input circuitry. Of course you have to open the monitor up and replace the defective component, More often than not no soldering required. Hope this gives you an idea or two. Lots of luck and pls post again how things turn up. If
SOURCE: beng pb7100 projector
It might be caused by the logical board or a sensor of it; you have no other choice but taking it to the repair center.
SOURCE: Power but no picture
Try to re-solder the inverter part of the board. You may recognize that part where the 4 connectors from the backlight tubes can be found.... usually the small transformators (sorry, my technical English is not good) have bad soldering eyes after longer use. This may work if backlight turns on for a few seconds, then the power led is still alight but screen goes dark.... the inverter then "thinks" one of the tubes might be defective and turns power off. Hope this helps a little...
SOURCE: Black screen after approx. 1 second.
it the inveter that gone bad on it.. if you still have the unit you might find a replace ment online i have 2 of these units .. and i had teh same thing happen .. even thouge i was giveng these unit way back when so it not as bad as you spening 2200 on the one you got..
SOURCE: Need to Buy a main system board/controler board for BenQ DV3750
Really Did not find a solution because we already know the problem. i.e the mani/digital board. BenQ will not sell us the part. We are still looking for a supplier.
NEVER NEVER Buy BenQ
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