Question about Compaq tc4200 Tablet PC

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I have two hp tc4200's that I bought for my son's. One of them the touchscreen will not rotate when in tablet mode and the screen turned black and I cannot get it to come back. You can hear the sounds and hear the laptop boot up correctly but there is no picture on the monitor. The second one the touch screen does not work at all. The touch buttons on the screen do not work either.

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I had the same problem with mine and I fixed it by myself a couple days ago after troubleshooting for months! It was soo frustrating but then once I saw what it was I was like ohhhhh! Lol. Try taking the 4 screws from the little piece on the back and check to see if your screen came unplugged from the laptop base. My wire haf gotten so twisted that it pulled the plug out. Just turn the screen to untwist the wire and plug it back in :)

Posted on Sep 19, 2012

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The problem could be a damage to the MB by excessive heat produced by Nvidia GPU. The only way to fix this permanently is to take out the MB and reflow the GPU with heat. You can find a video on youtube how to do it. You must take out the piece of gel between GPU and cooling unit and replace it with copper bar or penny made prior 1983 - still made out of copper. Also clean the fan. Use heat transfer paste like arctic cool - not a glue, on both sides of the penny. Install win7. Win7 does not use the coprocessor and will help to ran the notebook cooler. Install speedFan 4.40 - free utility to see what the temp is of your GPU and CPU. If you did good job it will stay around 55C. If your HP notebook is still running check the temp. If the GPU is running 80C or more it will melt the connections on the MB and quit working sooner or later.

Posted on Apr 21, 2010

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