I recently replaced a bad fan that was causing the laptop to heat up and a LCD screen display that was no good. However, when I turned on the laptop turns on, you can see the lights go on, the LCD screen doesn't turn on but, the fan works now and after about 27 seconds the laptop beeps twice and shuts off automatically. Any ideas what that may be. Thx!!
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Re: Thinkpad T21 Boot Problems Problems
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
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| | Installing this wireless adapter couldn't have fried the motherboard, right? ||I would not have thought so .. the software may have caused an issue --- as the PC boots tap F8 you should get a menu - choose "last known good configuration" ---- if that does not work, reboot and again tap F8 as it boots and this time choose safemode - then see if you can restore start>programs>accessories>system tools>system restore> choose a date to before the data you installed the wireless adapter software
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.
If the computer seems to boot up just fine, but is not displaying a picture, take a flashlight and shine it at an angle on the screen, and see if you can see a very faint image of what should be displayed. If this is the case then the backlight bulb in your LCD panel has burned out. If you do not see anything on the screen at all even under a flashlight, then this could be indicative of a larger problem.
Hook the laptop up to an external monitor to make sure that you get a proper image on there first before you proceed. (Make sure that you try to change the laptop from internal video mode to external video mode if nothing shows up immediately. I have to press the Fn + F7 buttons on my T40p to tell it to use an external video monitor) If nothing shows up on the external monitor, then odds are that something else is wrong. Start by removing sticks of memory one at a time to see if they are causing the system to not boot up. (If memory is the problem, you should hear a series of beeps on startup though). Other complete video failure causes ussually have something to do with the Motherboard, orsome subsystem of it.
If you can see video on the external monitor, then either the LCD panel has gone bad, or the video cable has come unplugged. You can check this on most thinkpads by removing the keyboard and making sure that the video ribbon cable is securely in place.
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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Does the battery get very hot? If so try running the laptop with it removed! This problem might also caused by a faulty heat sensor on the motherboard. Given the current cost of new laptops I wouldn't spend a lot of money on any repair options, but you could invest in a "laptop cooler" or chill mat see this link http://www.quadcooler.com/