Comments on: How to test LCD screen inverter in a laptop

By: Anil

Anil — Sun, 14 Mar 2010 17:53:18 +0000

hello,
I am having a toshiba satellite laptop. The invertor was getting too hot below the screen. One fine day the screen went black but still can read under a tube light. I ordered a new screen invertor and replaced the old one. It works and still gets hot. Now after a week the screen again went black again.What could be the reason for the invertor getting hot.
Please help.
Regards
Anil

By: Yamandu

Yamandu — Fri, 12 Mar 2010 21:53:36 +0000

I would like to know what I can do because the computer that I bought is having a failure, in LCD screen.

When I start the computer the screen begins to sweep from the bottom to the top, this happens for about 3 minutes, and after that time (about) it gets still and looks normal, although on the bottom of the screen a single line of pixels continuous flickering and changing of color (rose, purple, blue).

Sometimes also after a while or when starting a new program the failure starts again.

I updated the Nvdia drivers, tried to change the screen resolution, but nothing changed.

I tested the computer with an external LCD and the problem disapeared.

I need to find a solution because it seems to get worse.

Yours sincerely.

*Product Type : Notebook
*Product Model : X83Vm
*Place of Purchase : USA
*Date of Purchase : 2009/1/1

By: D Chai

D Chai — Thu, 11 Mar 2010 20:16:17 +0000

In regarding to the two connector type you have shown in the picture. Are they inter-changeable? I mean if my original inverter has “big” connector plug into it, and, my newly purchased LCD screen happen has “small” connector at end of wire. Can I simply cut and connect the old one to replace the one on new screen?

By: cj2600

cj2600 — Wed, 03 Mar 2010 07:00:46 +0000

Tim,

I have a Dell Inspiron 1300, recently the inverter broke. But I can’t find this exact inverter. Si I would like to ask if I can use the inverter with P/N: YPNL-N021A IV12139/T-LF to replace the original inverter with P/N: PWB-IV11145/T/W2-LF?

Just search on Google for YPNL-N021A and you’ll find it.
I would recommend replacing it with the same inverter.

By: Tim

Tim — Wed, 03 Mar 2010 06:55:42 +0000

Hi, I have a Dell Inspiron 1300, recently the inverter broke. But I can’t find this exact inverter. Si I would like to ask if I can use the inverter with P/N: YPNL-N021A IV12139/T-LF to replace the original inverter with P/N: PWB-IV11145/T/W2-LF?

Thank you very much for your kind attention and help!

.tim

By: dsolod

dsolod — Mon, 22 Feb 2010 03:07:21 +0000

cj2600,
Thank you for your reply. Here is the second part of my story. I got the new CCFL for replacement. I connected it to inverter and found it working when the original one did not. Bingo! Being sure that the lamp was the problem I replaced it with the new one on my DELL Inspiron 6000. When I assembled everything back and turned the notebook on I saw the familiar dull image. Whaaat!!! The first thing in my ming was that I damaged the back light during the installation. I disassembled everything back and suddenly it started working again. I tried to find the problem and bended slightly the screen and rechecked all the connection. Sometimes during those tests the lamp did not glow but i could not find the problem. I put everything back and now the laptop is working normally but already I had one situation when I had to restart the computer because of the dull image. I have no idea what to blame. It could be a electrical board on the screen, it could be the screen cable. I do not know what to do to be sure. I do not want to buy the new screen thinking that it might be cable. Could anybody give me piece of advise please?
Thanks!

By: cj2600

cj2600 — Thu, 11 Feb 2010 08:00:32 +0000

nicholas,

I was wondering how one can pinpoint the faulty component, when the laptop had a flickering screen which now blacks out after a few minutes of use (but is visible under strong light). Is it the inverter issue, or perhaps the cables that feed it?

Most likely this is inverter related problem.
1. Try replacing the inverter board first.
2. If no help, most likely it’s bad backlight lamp inside the LCD screen. You’ll have to replace the screen (or backlight lamp inside the screen).

By: cj2600

cj2600 — Thu, 11 Feb 2010 07:57:21 +0000

dsolod,

I am having similar problem but with a little detail. I get the very dull image on the screen only when my laptop (DELL Inspiron 6000) is cold. After running under this condition about 20 minutes and several restarts it begins showing the normal bright picture with NO problems after. Initially I thought that it might be either inverter or back light. Yesterday I replaced the inverter with no results. I am ready to replace the CCFL but now I am thinking that the problem could be something else.
If it’s a backlight problem then why it is working right now without any failures even when I restart laptop (because it’s warm). If it’s a connection, wire or soldering problem then it should failure from time to time during the work when i bend the screen and even touch the wires.
Does anybody have similar experience? Please give me a piece of advise! I would really appreciate this because I do not want to go through the CCFL replacing procedure if I am not sure that this is the case

I guess you can buy a new CCFL lamp (it’s expenisve) and the laptop without installing the lamp into the LCD screen.
By the way, it’s not easy to replace the backlight lamp at all. I would suggest replacing the entire LCD screen if the backlight lamp is the problem.

By: cj2600

cj2600 — Thu, 11 Feb 2010 07:37:26 +0000

Gerry,

The screen went black 6 months ago but, sometimes booth normally and then a few seconds later…the screen with go black again. I can see very faint image. Through research and reading your advice…it sounds like a bad inverter. I replaced the inverter and it works for 9 hours straight…the next day when I boot the laptop…it’s black again. I can use the laptop using an external monitor…so I know my video card is good. Any ideas/suggestion?

Maybe you purchased a defective inverter? Did you buy it from a reputable seller?
I would try replacing it again just in case. It worked for 9 hours, didn’t it?

By: Gerry

Gerry — Mon, 08 Feb 2010 04:43:52 +0000

I have a Dell XPS Inspiron Laptop…I have similar problem on my screen like some of the others here. The screen went black 6 months ago but, sometimes booth normally and then a few seconds later…the screen with go black again. I can see very faint image. Through research and reading your advice…it sounds like a bad inverter. I replaced the inverter and it works for 9 hours straight…the next day when I boot the laptop…it’s black again. I can use the laptop using an external monitor…so I know my video card is good. Any ideas/suggestion? Please help. This site is very informative…Thank you so much in advance.