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Thinkpad g41 2886-78u lcd wont come on

The monitor turns on for a little bit and then goes off. I changed the lcd cable becuase it was fraied but when i turn it on it still stays on for a little bit and then goes off. The drive is good because I put it in another machine and it boots fine.

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What happend when you plug an external monitor into the VGA connector?

Posted on Mar 27, 2008

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T42p display lights for a couple of minutes through startup then goes dark


But fan still runs, and it sounds like the harddrive is spinning?

Diagnose.

Do you have a VGA monitor available?
You can use a CRT type, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

http://en.wikipedia.org/wiki/VGA_connector

1) Laptop OFF, monitor OFF, connect the VGA monitor cable to the left side of the ThinkPad T42. (DisplayPort)

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By factory default, the display should show on the external VGA monitor.
If not;

There are at least three display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Press, and hold down on the Fn key, and at the same time tap once on the F7 key. The F7 key is the Display Toggle-Over key.

3) Good display on external monitor?
Problem is the video cable, or inside the Display Assembly.

Since the display goes dark after a couple of minutes, I can tell you the problem is the screen Inverter, or Backlight.
(Inside the Display Assembly)

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED's.
(Light Emitting Diode)

The Lenovo ThinkPad T42 series of Notebook PC's, uses a single CCFL for a Backlight,

http://www.screentekinc.com/IBM__ThinkPad__T42-series-laptops-lcd-screens.shtml

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

[Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height ]

A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.

(Older versions of backlighting that used a series of LED's, used a screen Inverter. Newer versions do not. For these replace the LCD screen)

A screen Inverter and an LCD screen are a MATCHED unit. Make sure you get the correct screen Inverter, or LCD screen, when buying.

Primer over.

One example of a screen Inverter for the T42's,

http://battery-adapter.com/product_info.php/products_id/3381/vThinkpad+T42

Pictorial guide for replacing a screen Inverter, in a ThinkPad T42 series of Notebook PC,

http://www.insidemylaptop.com/replace-screen-inverter-in-ibm-thinkpad-t40-t40p-t41-t41p-t42-t42p-laptops/

http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

Lenovo Support link to the Hardware Maintenance Manual, for the ThinkPad T42 series of Notebook PC's,
(HMM. It is a Service Manual),

http://support.lenovo.com/en_US/guides-and-manuals/default.page?

Click on the bold black subheading -
Hardware maintenance manuals
Then click on the blue -> [+] Click for files

It is a PDF file.
It may take up to 30 seconds before the first page comes up.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 29, 2012 | Lenovo ThinkPad T42 Notebook

1 Answer

My IBM Thinkpad screen has gone dark but I can still see a bit. Is there a key to brighten the screen?


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp

Aug 29, 2010 | IBM ThinkPad T23 2647 Notebook

1 Answer

Monitor wont turn on


but are you hearing any start up sound when you turn on your pc? check if its the monitor/lcd or the videocard is the one having problems, try to hook a known good external monitor2_bing.gif. if it has the same bad display, its the videocard. if it has good display, then the lcd2_bing.gif/monitor is the part you need to replace.

Mar 31, 2010 | IBM ThinkPad T23 2647 Notebook

1 Answer

Hand-me-down IBM Thinkpad 600E 2645 has blinking LCD video XP O/S


This sounds to me like either your flourescent lighting tube is beginning to go bad ,,, or the inverter is going bad ... or even both. :-)

The cheapest and easiest solution for you is to simply replace the LCD screen (replacing the inverter or the tube are actually a bit cheaper, but not quite as easy to do - most computer repair centers will try to talk you into a new screen anyway). This is actually very simple for either you or someone you know who is an avid "do-it-yourselfer". IBM makes ity very easy. You will find easy, detailed instructions in the ThinkPad 600/600E (2645) Hardware Maintenance Manual, IBM S10L-9619-03 June 1999 available for FREE downloading in .pdf format on IBMs website. Follow this link to some really sweet deals on LCD screens for your 600e on eBay for under $35.00. http://shop.ebay.com/items/?_nkw=ibm+thinkpad+600e+lcd+screen&_sacat=0&_trksid=p3286.m270.l1313&_sop=12&_dmpt=Vintage_Electronics_R2&_odkw=IBM+tube&_osacat=0

Remember you can always connect an external monitor to your ThinkPad until your new screen arrives if you have one. The manual should also give you instructions to change out the tube if you wish to save a few more bucks and try that route. Hope this will FIX-YA! Please leave your feedback and let me know!

Jul 27, 2009 | IBM PC Laptops

1 Answer

Problem with the screen of a Dell Inspiron 1521


Hi
In your caseHi
normally with vertical stripes it can happen due to
1.a bad LCD (small little chip inside LCD and can't manual repair)
2.a loose connection cable
so here what I do is first I try to tap at the back of the LCD and see that the problem goes away or not.If yes then a loose connection.
if no what I would do here ,coz I have a spare LCD I just exchange to test it...if the problem goes away then a BAD LCD.
Incase of verticle line due to bad LCD you can't repair it trust me.All the small IC chips are blended with board and can't really be repair.More quesiton feel free to post here.
goodluck,takecare.

Jul 18, 2008 | PC Laptops

4 Answers

IBM Thinkpad T21 LCD problem


Hello shadl

Am I understanding your correctly? - the monitor of your T21 is working intermittently? Please, let me know if I've misunderstood your description of the problem.
------
If the issue is w/ the monitor, ....

And the symptoms are intermittent and change w/ opening and closing the cover (monitor) then there's a good possibility the problem isn't w/ the monitor itself rather it's w/ the cables or wiring going from the monitor to the mainboard. If that is the case, whether it is repairable w/o replacing the monitor will depend upon the cables and/or wiring involved.

It would make sense that an issue like that was caused by worn or damaged cables/wiring as those are the parts of the monitor that would've been subject to wear and tear over time.

I recommend you disassemble the monitor from the laptop and carefully inspect all the cables and wiring that run between the monitor and the laptop.
I will see if I can find a service manual online for you that will step you through removing the monitor.

If it does turn out that the problem is w/ the monitor itself or that the monitor's wiring or cables cannot be repaired, you can search the Internet for another Thinkpad T21 that you can salvage parts off of. (eBay would be one good place to look.) You can try finding just the monitor but I think you'll stand a better chance at finding a T21 that is being sold for salvage.

In the interim, you should be able to connect an external monitor and use the computer w/ it for now.

IF you connect an external monitor and the symptoms persist, then the problem isn't w/ your monitor at all. Be sure to post back here and let us know if that is the case, too.

***************
Please, let me know if this response was "Helpful" or a "FixYa" for you or, of course, if you have additional questions, etc on this topic.

If I did not answer your question satisfactorially, plz, b4 assigning a "Thanks for Trying" or lower rating to my "Solution", let me know. I may have misunderstood you or the problem you are experiencing. In any case, I will work w/ you until your problem is resolved or diagnosed. I promise! :)

Thank you
BJ
***************

Apr 05, 2008 | IBM ThinkPad T21 Notebook

1 Answer

Thinkpad lcd wont come on


Hello, It may be the power is set wrong. Click start, control panel, power options. From here you can set the amount of time you want the monitor or hard drive/s to remain on until the shut down or go into hibernation. Hope this helps.

Mar 25, 2008 | PC Laptops

1 Answer

White screen Ibm t 23


Have you tried switching the LCD monitor from teh good thinkpad to the ones with white screens? Sometimes its the actuall LCD.

Mar 16, 2008 | IBM ThinkPad T23 2647 Notebook

2 Answers

White screen


This could be caused for a number of reasons. First thing to determine is if the computer is bad or just the screen. Hook up a external monitor to the laptop and turn it on and use the FN key to turn on the external monitor port. If the computer is running fine with the external monitor then you have a bad LCD or LCD inverter. which is replacable but expensive.. you would want to look at getting a new laptop or using it with the external monitor.

Jan 18, 2008 | Acer TravelMate 2300 Notebook

1 Answer

Thinkpad a31 lcd problems


Well yes BUT if it is a problem with the LCD then you would need to replace try plugging an external monitor to see if the sizes are normal if they arent then it is definately a problem with the screen resolutions.??

Sep 02, 2007 | IBM ThinkPad A31 Notebook

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