Question about Dell Latitude C640 Notebook

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LCD Dark Hot Spot in lower Left hand cornor

After a while i get a dark hot spot in the lower left hand cornor. Do i need a new LCD or a inverter not sure what to do.

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  • Mike Cooper May 11, 2007

    Well, I found out that the dark hot spot would subside if i turned down the contrast and brightness, however the back light went out a day later. So, I had a old Dell Inspiron 4100 with a 14.1 LCD so i swaped them and now the problem is solved. Thank you.

  • malekhar Nov 11, 2008

    I have an IBM thinkpad R51. My notebook LCD became hot especially at the left bottom corner and a black spot emerge from that corner. I switch off my notebook but the problem still occur few minutes i turned it on. Please give some advice.

  • sandyprak123 Dec 24, 2008

    I own aToshiba laptop.As soon as I turn it on,the lower right hand corner of the screen starts going black and is extremely hot to the touch.Can someone tell why this happens? And solution to fix it !!

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  • 104 Answers

Well the inveter powers the lamps in the LCD itself. If the lamps come on ,you don't need a new inverter but more than likely just a new LCD! hope this was helpful regards, babb

Posted on May 10, 2007

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Posted on Jan 02, 2017

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I am afraid that the dark spot in the screen is not repairable. Manage as long as you can or go for a new tv.

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1,white spots appeared on screen,means the DMD is broken,you need a new DMD. USD150-200
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I just replaced bulb with new and after a day there is a dark spot on the screen


I have the same TV - I have a dark spot in the upper left hand corner. I have always thought this TV was dark. Be sure to get OME lamp. Cheaper ones are not worth it and can damage your TV more.
dlplampsource,com--Just a note if this ever happens to you. TV would not come on in the AM-Had no picture, but had sound. It was not the lamp, but the safety switch. It's blue and at the bottom of the lamp housing. As soon as I flipped it and replaced the back cover, the TV came on.

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My dell inspirion 6000 laptop screen goes black but sometimes I can see the windows screen but it's very dark. When I attach it to a desktop monitor it works fine but the laptop is still dark. Sometime the...


The back light is the whole of the screen, the screen is illuminated by a CCFL lamp (fluro tube) on the bottom of the screen. A inverter supplies high voltage to this CCFL lamp.
If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :-
http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen

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1 Answer

There is a yellowish patch of in the lower left hand corner of my screen, either to a fall or some other type of impact. Is this fixable, if so how much?


sometimes in this set foams comes apart inside and looks like a dark spot on screen in the corners, if you can open up then then look around the light engine.

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When I first turn on the set, part of the screen is dark, not black but dark. The area of the screen that is dark moves around. It will be like this for 20 minutes or more. The problem sometimes comes...


Hi

It could be a power supply problem or an inverter board problem or something internal having to do with the backlighting of the unit. remove the inverter, and look at the back side and you will see a hot spot, now on the other side of that hot spot, re-solder the service mounted components and that should take care of your problem.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com

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quote:"The spot was too hot to keep my finger on it while the rest of the screen was cool" You have a partial hardware failure on the lcd's internal circuitry (column and row drivers, stuff like that).
The short time it's working is about the overcurrent protection delay, it cutt's itself the Vcc, Vdd and control signals for limiting the fire hazard.

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Return it for a refund? Contact the manufacturer? I would need to see this so called dark spot to make a decision on whether it is normal or not..

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