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ThinkPad T21 dark monitor. What part to change?

Hello, I have an IBM ThinkPad T21 notebook and when I turn it on, the LCD screen gets too dark that you can barely see anything shown on the screen.

Some time ago I used to press many times with heavy pressure the part of the panel over the inverter and it worked, but now it doesn't work anymore. I can let it turned for hours and it keeps dark.

One curious thing is that if i plug it on an external monitor, the image is normal on the monitor and after about half an hour the image shows on LCD screen. The image is shown ''yellowrized'' (I can see some traces of yellow light coming from the bottom sides of the screen), but what before didn't work now works.

So I want to know what part I have to change. Is it the inverter, the backlight or the LCD flat?

Is it hard to change tha last two ones?

If you need additional details you can ask me.

Thank you!!

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  • Divya K
    Divya K May 11, 2010

    You can replace only the back light as in its not a seperate part , you will have to replace the whole LCD panel, before that check in BIOS as well, if the same issue on BIOS, Go for LCD replacement

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  • 404 Answers

Seems like a bad inverter that needs changing

Posted on Jul 03, 2009

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How to remove the display on IBM T21 laptop


The laptop screen is secured to the laptop with screws at the hinges.
There are usually two screws per hinge. The LCD screen has one ribbon cable and possibly a power connector for the back lighting attached to the motherboard near the hinges. Disconnect these before you lift the LCD off the base, they are under the plastic panel above the function keys next to the hinges.

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This is caused by a system board failure. Take the laptop apart again and check all of your connections. Also make sure the ram and processor are seated correctly. You can also try hooking up an external monitor to see if any errors display. This may be an indication that the video cable connected to the system board is not fully connected.

From IBM website:
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Back light on ibm t21


This is an known problem I think you must replace the backlight:
look for example ebay partnr: 260327530145
only for example if this is your problem.

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- Flickering, red or pinkish hue to display and even total darkness. These symptoms are a result of a failed or ageing backlight or a failed, damaged. This is caused by the defective backlight lamp and all you need to do is replace the backlight.

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Suspend light


Is your laptops motherboard and vga chipset working? Please try to connect the laptop to another monitor if you are unable to get any image out it might be that the 2nd output is disable OR your motherboard or vga chipset has failed.

If the laptop works on another monitor, then there is still something wrong on the lcd.

But I think there is a more serious problem.

if you need more assitance let me know. good luck.

Mar 30, 2008 | IBM ThinkPad T21 Notebook

1 Answer

LCD and inverter replaced, still dark


The most common fault here is certainly the screen cable - it is available cheaply on ebay - I'm in the UK so here is a local example in this link:

T23 Cable

the other slim possibility is failure of the backlight switch which detects when the screen lid is closed.

Please rate this assistance as we depend on your feedback - hopefully this should be fixya - thanks,

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Hi,

To my knowledge an IBM ThinkPad T21 originally was shipped out from the manufacturer without a WiFi networking interface, sorry.

Kind regards.

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Cracked TFT screen on IBM Thinkpad T21


HERE IS A LIST OF P/N THAT WILL WORK

46L4843 LCD 14.1

05K9942 LCD XGA 14.1

05K9678

05K9668

05K9567

05K9944 ALL SUB TO 04L2348

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