Today I will be removing and replacing the LCD screen in an IBM ThinkPad T43p laptop.
You can use these instructions for ThinkPad T43 and some other IBM (now Lenovo) models.
Failure description: the laptop starts with a reddish image (white color appear to be pink). After a minute or two the backlight goes completely off but you still can see a very faint image if you look very closely. When you restart the laptop, the screen lights up again but a minute later the light goes off.
Solution: the screen has a failing backlight and it has to be replaced.
Carefully remove four screw seals from the bottom part of the display bezel.
You can remove them with a sharp object.
Remove all four screws found under the seals.
Remove three screws (found under seals) from the left side of the display panel.
Remove four screws (found under seals) from the right side of the display panel.
The display bezel is glued to the screen with sticky tape. You can separate the bezel using a guitar pick (as I do) or another piece of plastic.
Insert the guitar pick under the bezel and carefully move it along the side until the bezel is separated.
Continue removing the display bezel with your fingers.
The inverter is mounted under the bezel and can be replaced without removing the bezel completely.
I’ll remove the display bezel because I have to replace the screen.
The display bezel has been removed.
In order to confirm the backlight lamp failure I did the following experiment.
I unplugged the LCD from the right side of the inverter board and plugged in an known good backlight lamp. After that I turned on the laptop and tested it with my backlight lamp for about 10 minutes. My backlight lamp didn’t turn off and worked fine all time. That means the backlight lamp inside the LCD is bad.
If your laptop doesn’t work with a known good backlight lamp, most likely you have a problem with the inverter board.
Unplug the inverter board from the video cable.
Remove the inverter board.
Carefully separate the LCD from the display cover. Do not forget to release the night lamp cable. Simply pull the cable from the display cover.
Now you can access the back side and unplug the display cable.
Remove sticky tape securing the connection and pull the cable from the connector.
Remove the LCD from the display assembly.
Here’s the back cover.
Be careful with this piece of plastic. Try not to remove it from the display because it will take some time to figure out how to connect it back together.
I believe this piece of plastic is designed to prevent the cable from breaking when you close the display.
Remove two screws securing the display mounting brackets.
Remove the bracket and move it to a new screen.
Do the same with the bracket on the other side.
You can find a new replacement LCD using two different part numbers from the back side of the defective one:
1. The model number. In my case it is N150U3-L01
2. FRU part number. In my case it is 92P6753.
|External Resources: Laptop Motherboard Shop|