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The backlight fault could be caused by a faulty inverter that supplies high voltage to the CCFL lamp OR the CCFL lamp could be faulty. The inverter is located at the bottom of the LCD screen between the laptop's hinges behind the plastic bezel surrounding the screen, The CCFL lamp is located on the bottom edge of the LCD screen behind a reflector that runs along the bottom edge of the LCD screen. The reflector is taped to the bottom edge of the screen. To get access to the inverter, remove the plastic bezel. To get access to the CCFL lamp, remove the screws that secures the hinges to the base, disconnect the video cable and inverter power leads from the motherboard. Remove the plastic bezel, it may have double sided tape securing it to the LCD screen, BE CAREFUL you do not damage the glass on the LCD screen. Remove the screws that fix the LCD to the lid. Now you can get access to the reflector and CCFL lamp. Carefuly remove the tape as you will need it to fix the reflector back onto the LCD.
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
Hi. I have 2 units of T23, 1 unit T22 and T30. All of them has the same problem as yours. 3 units has bad inverter and the other 1 has bad CFL. Inverters can be replaced but if you have bad CFL, it is better to replace LCD screen. If your problem is CFL, you will be able to see a very faint image on your LCD screen. If the LCD is completely black and you can't see anything, then it is an inverter problem.
Test with an external monitor. If it works, it is the display's backlight or inverter board.
If you were experiencing discoloration in the screen (pinkish lower light hues) before it failed, that would indicate a CCFL backlight issue. If the screen suddenly went dim on you rather than a slow degradation the inverter would be indicated.
1. your issue may be a bad hard, a damaged or loose flex cable to the LCD screen, a defective CPU (central processing unit, a cmos battery that needs replacement ( this is the battery that retains the information for the motherboard), a bad power supply regulator on the mother board. 2. this is just a few of the issue that have caused a white screen. 3. Laptops are mostly disposable and are usually good for 2to 3 years of service depending on the care taken. Your friend probably thought he was helping by giving this to you to see if you could use it or part it out. Not worth the work unless you are into PC repair or project work. 2.
Yes you have no backlight. The screen is all dark but in the back you can barly see it. You inverter is bad on you thinkpad. You need to replace it. I have a IBM thinkpad 600e and i got one for $9.95 so they can be cheap. They are located under the lcd. When you open it up it is there or can see that it is attached to the light dimmer swicth so you will know that is it. Thats your problem