BenQ T701 TFT 17" LCD Monitor Logo

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Victor zambezi Posted on Jun 23, 2007
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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?

  • 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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  • Posted on Jan 22, 2009
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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.

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  • Posted on Jun 24, 2007
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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.

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  • Posted on Jan 17, 2009
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Swaped 2 shorted 2SC5707 and resolderd some dry joints
Now working perfectley

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  • Posted on Dec 12, 2007
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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...

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

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Replace bad electrolytic caps on power supply module,or just replace power supply, that should fix your problem.
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I brought my benq t701 to a repair shop to due blackout screen. But due to lack of parts, it was not repaired but all 6 transistors were removed from the PCB. Please show me where these transistors were...

go to esservice.com and get the manual from there will be easier as the transistors are directional i believe they are 2sc5707s from memory but you will need to check the transformers and the 2 filter caps on either side of them as if they are faulty will blow transistors.
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faulty power board... possibly caused by blown capacitors..
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Possibly either the backlight lamp or its associated power supply has failed. Power buttons (mostly LEDs) have constant availability of low voltage (for some other circuits too) otherwise they wouldn't 'wake up' on command from a computer as some do.
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if your monitor is not connected to a pc, then it cannot find a vga signal input and therefore go into power saving mode, which is indicated by the orange light, but as soon as you connect to the pc and power on the light will go green and the monitor will power up.
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see this post
http://www.fixya.com/support/t155971-benq_t701_lcd_monitor
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