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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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  • 5 Answers

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

Posted on Mar 27, 2008

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When i shutdown my computer after that when lcd goes black then at that time a message shown on the black screen that


Normal behavior. Most of the lcd monitors ( not all) show this message. You can safely turn off the monitor once you shutdown your computer.

Oct 17, 2014 | Samsung SyncMaster 713BM 17" LCD Monitor

1 Answer

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

L1910 Monitor: goes to sleep when turned on...


It may have gone into shut down mode becuase it sensing problem. Try it on another PC, check VGA cable.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed HP monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague

http://www.badcaps.net

May 18, 2010 | HP L1910 Monitor

1 Answer

My problem with this screen is that when I try to go to another web site the whole screen starts flickering and I can't go to another web site. Happens once in awhile, sometimes it works great and then all...


Could be a loose cable inside off the monitor. There is a cable that hooks into the back of the lcd and if that is even loose by a little bit it can make the screen act crazy. If you can get the back cover off of the monitor, try to unseat and reseat that cable to see if the problem goes away.

If you do that and it still exists then the lcd is bad and the whole monitor needs to be replaced.


May 02, 2009 | Acer V193w LCD Monitor

1 Answer

IBM THINKPAD


Hi...there,

It's seems your Thinkpad need a new inverter, due to a backlight inverter burnt out. Get a new one or repaired it. Good lucks!

Sep 06, 2008 | IBM ThinkVision L170 17" LCD Monitor

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 | Computers & Internet

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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