Question about Compaq 348332-001 - Tablet system board w (348332001)

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Garbled video on tc1100

Is there a solution for garbled video on tc1100?

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  • jyd777 Jun 26, 2008

    If i change the motherboard & TC1100 keyboard control KBD-BOX v2.2
    will the same problem occurs again? i seldom use the keyboard.

  • Anonymous Nov 10, 2008

    I read a post once that suggested putting the Tablet in the freezer. Really. I did - and 15 minutes later it booted up with a perfect screen. Unfortunately it goes back to the original garbled look if you re-boot, but at least I could get my data off to a flash drive.

  • Anonymous Jan 07, 2009

    I have been grappling with this problem for the longest time. Make Toast hit this one out of the park with both the excellent explanation of the problem and the remedy, albeit temporary.

    Removing the keyboard did not help, yet tilting it forward at or before boot up works like a charm.

    Thanks

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Sorry for the long reply, but I hope this helps.

You will need to replace the system board and the keyboard receiving bracket inside the computer to fix this problem.

I work at an institution that uses these laptops and we've seen this repair a lot... and I personally have a tc1100 that has gone through 5 system boards. HP has a new (slightly redesigned?) keyboard receiving bracket that helps (but doesnt always) remedy this problem. HP themselves told us that we need to replace the systemboard, keyboard bracket and keyboard when we see this problem on one of our machines. We replace them all the time at our repair shop and it is the only thing that consistently works.

Note: The system board's connections near the graphics controller can be severed (its a multilayered board so you might not be able to see it if you looked) when the keyboard can move inside the keyboard bracket thus causing your garbled / checkerboard screen.

For this reason, you can sometimes temporarily get it to boot correctly by tilting the screen towards you all the way before turning it on. We've also seen some cases where disconnecting the keyboard and trying to boot will work. You can use those ideas only as temporary fixes though, and I'm sorry to say that this problem will get progressively worse until you repair it.

Posted on Apr 26, 2008

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I was able to solve this problem by folding a piece of paper into a small square. I then put this above the video chip (black chip next to usb keyboard connector).

This puts pressure on the chip creating a better connection. Now my system consistently boot without a problem

Posted on May 31, 2009

  • christian Apr 26, 2013

    Hi I have a question please could you please help me to locate the video chip I can not find it

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I finally fixed my Tablet. It turns out that it isn't because of the keyboard bracket causing hairline fractures on pcb but the bga connections of the graphics card.

A simple session of solder reflow for the main board is all that is required. With reflow work the main thing you have to be careful of is bumping the components when the solder is still liquid.

#1 remove the main board from the computer
#2 remove anything on the main board that is not nailed down. (heat sinks, the pcmcia bracket, ALL THE TAPE* on the board)
* I didn't remove a piece of tape that was sitting on the connector to the side buttons and power switch. After I heating up, it warped and pulled the connector off the pads. It was then a ton of extra work to get it reseated because I don't have a hot air station.
#3 Reflow in a toaster oven. There are a few good guides on the net but the main point it bring it up to temperature and let it cool down slowly.
#4 Reassemble and enjoy.

Posted on Jan 13, 2010

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Got it!

It's a combination of all the solutions listed here, and it's actually a really easy fix.

1. It is a problem with the system board, Make_Toast
2. The problem is with the soldering, ttsai
3. Good job pinpointing the problem to the video chip, Bigpopa186!

There is a defect in the solder job on the video chip attached to the system board. Bigpopa186's solution of applying pressure to the top of the chip solves the problem every time.

My contribution is to suggest that instead of a folded piece of paper, which does not conduct heat to the heat sink touching the top of the video chip, I recomend placing a 1" metal washer on top of the video chip. So that it does not move around, be sure to wedge one end of it under the black tape that covers half the video chip. Now re-attach the heatsink cover and bingo, problem solved AND your video chip is keeping cool.

Hope this solves your problem!

AMizzi

Posted on Jul 24, 2010

I have also experienced the garbled screen and in my searches for a fix I found a reference to putting the TC1100 in a freezer for 15 minutes and it worked! It is only temporary (it lasts until you reboot), but at least I could get my data off to a flash drive since I could now see the screen.

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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1. It is a problem with the system board
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There is a defect in the solder job on the video chip attached to the system board. The solution of applying pressure to the top of the chip solves the problem every time.

My suggestion is to place a 1" metal washer on top of the video chip. So that it does not move around, be sure to wedge one end of it under the black tape that covers half the video chip. Now re-attach the heatsink cover and bingo, problem solved AND your video chip is keeping cool.

Hope this solves your problem!

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