Re: Benq Q7t4 / Fp71g+
Just a bit more. It is a big job to replace them. Look for blackend ends of the CCFLs (PHOTO'S ATTACHED). They must break through the glass. When they were replaced they are extreamly easy to break.
Sorry for posting in wrong forum. Did not realise there were others! But more the merrier.
Jamie...
scb10
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Last Activity: 11-18-2009, 05:28 PM
Joined: 08-03-2009
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Re: Benq Q7t4 / Fp71g+
FIXED!
One of the techs here found a posting in another forum that led him to belive that the fluro's were the issue.
BINGO.... The ends short with the chasie and cause the LCD to shut down. We got replacement fluro's from the USA on eBay.
SO PLAINBILL you were barking up the correct tree. It was the CCFLs.
Thanks all for your inputs. We now have 6 of these so I would imagine this to now be a common fault.
Cheers
JadenLeave a comment:
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Re: Benq Q7t4 / Fp71g+
I did find this service 'guide' that may help others in future.
About 2.4Meg. The lodgic board is not to similar though to mine.
My thoughs are the same in that something is telling it to shut down into sleep mode.Leave a comment:
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Re: Benq Q7t4 / Fp71g+
Thanks Your Highness & tmwalsh
There are no more boards in this LCD, just two, and that the fault is on the Interface Board or could it be the fluro's?
Just thought someone may have come across it.
Cheers
JamieLeave a comment:
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Re: Benq Q7t4 / Fp71g+
Here is a photo of the power board....Leave a comment:
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Re: Benq Q7t4 / Fp71g+
I will get a photo of the board up for you. Oh and it is an Australian model, not that I would think that that would make any difference!
Cheers
JamieLeave a comment:
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Re: Benq Q7t4 / Fp71g+
Sorry I am lost as to where you are going with the caps! I have placed the Inverter Power Board into a know good monitor and it works, so that board is OK. This model has two boards only. The Power/Inverter board and the main Interface Board (M170EP01 V2) which I have proven to be the fault. Only two circuit boards, no more.
[I]"logic board has the VGA and DVI connectors, the video conversion controller, and the connectors to the buttons and to the LCD panel."[/I] Yes this is the board I have a fault with PlainBill.
...Last edited by scb10; 08-05-2009, 05:53 PM.Leave a comment:
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Re: Benq Q7t4 / Fp71g+
Thanks PlainBill,
Well as you can see it is all Surface mount components. I was hoping that the fact that I have 5 of these all with the same fault that there maybe somone out thier that has had the same fault and fixed it! I know I will be pushing it up hill to get BENQ to give me an answer.
The black heatshrink on the board is my attempt to change the crystal from a known good board. Unfortunatly the tracks went well under the crystal and resulted in the ripping of tracks to get it out. Even with a good lead-free soldering iron....Leave a comment:
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Benq Q7t4 / Fp71g+
Hi All,
I have 5 of the above LCD's with all the same problem (and three OK). Lucky to have so many hey?
On turn on the LED goes green and the BENQ logo is displayed, then the desktop is displayed and 'nonpreset mode' is flashed up before the screen goes blank. The power led then goes amber (stanby). Changing the resolution on the PC (I hooked two LCD's up on a dual video card to do this) will briefly get the BENQ to display and then die again, but the 'nonpreset mode' does not always flash up. No resolution mode will make the BENQ stay on.
I can tell...
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