Question about BenQ DV3070 30 in. LCD HDTV

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Benq lcd tv

A friend brought me a 30" benq lcd tv. the problem is this thing powers up, the backlight comes on briefly and then goes out. no matter what input i use - component, vga, dvi, or composite - it will not light. the display is black, the power light is on green and the fan in the back of the unit is spinning. tried using the "i" key on the remote or the input key on the top of the tv - no result. with a dvd player, sat receiver or a pc - nothing works. every time you turn it on the same thing - brief backlit black screen then a totally black screen. any help would be appreciated. Zippie p.s. i build computers - so i am comfortable with electronics, just not an expert.

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Re: benq lcd tv

It sounds like the inverter is the issues from what i seen this is a commen problem i have 2 units one for parts.. and this moring my screen started what your were doing .. so i just going to look around for a uses inverter lol

Posted on Aug 10, 2008

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Re: 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

Posted on Aug 09, 2007

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