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ThinkPad T21 dark monitor. What part to change?

\015 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!!\015

Answers :

Seems like a bad inverter that needs changing
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