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?
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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.
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: Two short beeps - System board failure
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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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.