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  1. #1
    Soundwave
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    May 2012
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    TF201
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    Another possible transformer prime hardware issue?

    So I have been experiencing a touch screen issue for quite a while, after 3 visits of the tablet to the Asus lab, and 1 replacement the issue persists.
    What happens is that I place a single finger (which apparently is more than it can handle) on the tablet and don't move it but the tablet thinks that I am move it like crazy, stranger still on rare occasions I am able to perform a zoom in / out with a single finger.
    Looking around the internet I found other people experiencing the same issue.
    After looking at the digitizer code I think that the issue is a design issue that exists in all transformer primes, and I think that I have found a way to make it show, and would like to ask the community with your assistance if you could spare some time and help me test my theory (there may be a work around using a firmware update, but the firmware is a binary blob):
    1. Place the tablet on an horizontal surface (without the dock).
    2. Connect the power cord and charge it.
    3. Set the CPU to performance mode.
    4. Run a program which uses the graphic processor / CPU, and let it run for about 30-60 mins.
    5. Go to settings -> developer options -> enable pointer location
    6. Touch any place on the touch screen for ~30-60 seconds and don't move your finger.
    Do you see the pointer location move? If so I would like to hear about it and know how wide spread the issue is.

    Thanks,
    Darkstar

  2. #2
    Soundwave
    Member #
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    TF201
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    As there is a lack of sufficient co-operation from Asus I have decided to post some additional details of the issue:
    Looking at the digitizer source code, the digitizer appears to be sensitive to EMI, they have even a special mode to help ignore additional noise when the AC adapter is connected.
    The device should be fairly resistant to external EMI due to the aluminum unibody design, but very susceptible to EMI from the internal components since there is little to no internal shielding (i.e. covering component with metal shielding), also noted by some other people (<A HREF="http://www.techrepublic.com/blog/cracking-open/asus-transformer-prime-teardown-solid-tablet-but-not-without-flaws/399">http://www.techrepublic.com/blog/cracking-open/asus-transformer-prime-teardown-solid-tablet-but-not-without-flaws/399</A>).
    There are several things that can affect the EMI emissions, WiFi & Bluetooth transmission power, temperature, CPU & GPU frequency and temperature.... That is why the test procedure I suggested is designed to increase the EMI to maximum.
    Also I have noticed that in the manual the SAR from the device 0.387 W/kg which is ~21 times higher than the test data they have submitted to the FCC (0.018 W/kg), which is quite strange by itself.

    You can see some examples from different users here (proper discovery, none of the links are from me):
    <A HREF="https://www.youtube.com/watch?v=oywWUxPMeX8">https://www.youtube.com/watch?v=oywWUxPMeX8</A>
    <A HREF="https://www.youtube.com/watch?v=Qai-bAsEVY8">https://www.youtube.com/watch?v=Qai-bAsEVY8</A>
    <A HREF="https://www.youtube.com/watch?v=1lCmVRf5rAc">https://www.youtube.com/watch?v=1lCmVRf5rAc</A>
    <A HREF="https://www.youtube.com/watch?v=W8H6P-_oy0Q">https://www.youtube.com/watch?v=W8H6P-_oy0Q</A>
    <A HREF="https://www.youtube.com/watch?v=d3_cpwfO5T8">https://www.youtube.com/watch?v=d3_cpwfO5T8</A>

  3. #3
    Jazz
    Member #
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    Feb 2012
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    What application would one use that you need to do all of those steps and then just place your finger in 1 spot for 1 minute to see if something happens?
    Asus Test Monkey

  4. #4
    Soundwave
    Member #
    36322
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    Well, there is no application that would require me to do it, this is to simplify the reconstruction of the issue. I use my finger as usual to scroll / type / draw but the device thinks that it moved all around /
    or that I typed a different key.
    For example when my nephew plays a games that uses the GPU & CPU he sometimes presses one place and the device thinks that another place has been pressed and the loses and get annoyed.
    For me t

  5. #5
    Soundwave
    Member #
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    That is what happened just (didn't mean to post the previous message yet).
    For me the breaking point was when I browsed some items in an online site, the pointer jumped & pressed the buy button, luckily a message box opened (with a transaction failed notice) and prompted my to input my credit card details (I feel lucky that I didn't entrust the device with my credit card details)

 

 

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