Question about BenQ T701 TFT 17" LCD Monitor

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Benq T701 LCD monitor

Suddenly my monitor is gone black but the power indicator is on. What could be the problem?

Posted by Victor zambezi on

  • cdninchina Dec 03, 2007

    Same issues as others..except during BIT I see the bios options and when windows loads I get a second of seeing windows THEN it goes black. Have tried changing resolution, uninstalling, changing power (110-220) nothing.

    Help?

  • Anonymous Apr 02, 2008

    I have the same problem with the BenQ FP91G+. Last night everything was fine. I come home from work today and BAM... the screen is black with nothing but extremely faint ghost-like images that I couldn't even see at first until I looked at the right angle to catch it.

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Anonymous

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I had a similar problem: the backlight on my Benq T701 only functioned for a couple of seconds every time a turned the monitor on and then the backlight switched off (sometimes in two stages). An electronics guru at work said with those symptoms the transistors rarely were the problem and I just needed to resolder the connections of the high voltage coils onto the PCB. On visual inspection those solder connections seemed ok, but when I tried to reflow the existing solder at one connection I spotted the problem: just a thin surface layer of solder was present and I had to add solder to fix the problem. The 4 coils each have 6 leads on one side and 2 on the other. I only soldered the connections on the side with 2 leads. In just 30 minutes and without buying parts the monitor is now up and running again.

Posted on Jan 22, 2009

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The LCD backlight inverter board needs to be replaced. For this brand monitor, it's pretty hard to find. Good Luck to you.

Posted on Jun 24, 2007

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Swaped 2 shorted 2SC5707 and resolderd some dry joints
Now working perfectley

Posted on Jan 17, 2009

Anonymous

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Http://www.lcdinverter.co.uk/env056.htm

this one i guess, going to buy at local electronics store tomorrow..

have same problem, and i have 2 of them...

Posted on Dec 12, 2007

Anonymous

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2SC5707 x4 (lamp driver transistor)....

Posted on Oct 26, 2007

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1 Answer

My monitor screen is black. The green light is on but black screen
The green light usually indicates that the monitor is getting a signal.
The lack of a picture is an indication that the monitor itself is having a problem. I would test the signal with another monitor if you can get one.
I suspect that the monitor backlight has gone bad (if so, you can see the screen very faintly if you shine a light on it).
Or, the screen circuitry has gone bad.

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I have just had this same problem. The problem mostlikely is a blown fuse on the inverter board. Mine was blown on the board and also a Capacitor (470nF/25V) was bad beside the Fuse.

I replaced both and monitor is working now again. After install the picture was a little grainy with little artifacts. In another post i found that the Power Supply board needs to be cleaned for unwanted residue. After that picture was fine again.

BEWARE that you need a soldering iron and a steady hand to replace these parts. If you are unfamiliar with soldering at all have an expert take a look at this. The Power boards uses 220v so DO NOT connect it to the Power when opened.

Starworx

9e48e23.jpg

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Hello - I have had a viewsonic monitor for 4 years, and suddenly the computer screen has gone black and will not turn on The green power light is on, all plugs are in correctly - please advise
The green power light would indicate that it knows it is hooked up to a computer, this is even more true if it turns yellow when you power down your computer. Can you plug this into another computer, or plug another working monitor into your computer? This will eliminate your computer as the problem.

Check you video cable, have you had it off before the monitor quit?

If it is still not working, at best you are looking at a cold solder joint, I have seen many monitors taken out by them and have fixed a few. I would sugest this to you only if you are aware of the high voltages that can be found in crt devices, even when not plugged in.

If you have not worked with highvoltage circuits I would suggest looking for a new or used one.
Used CRT's are give them away cheap now. Check your local want ads and craigslist.

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Hello,

We have a dis-assebly and repair guide posted on our web site at:
www.ccl-la.com/monitor_repair.htm
The problem is usually the driver transistors, our guide shows where they are and what to replace to get your monitor back running again.

I hope this helps, If so please rate my solution.

Buddy
Corporate Computer
www.ccl-la.com

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T701 TFT 17" LCD Monitor

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BenQ T701 problem Hi! I have BenQ T701 when I switch monitor on it display like tru red glass and after 3 seconds monitor goes off but the power indicator stays on.

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