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  1. #1
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    820-2915 Split Screen works on external

    So I replaced the Gpu chip on a customer machine 3 months ago with a know batch from good chips 0084 which I've never had one come back yet luckily (almost out though)
    But I've never seen a video issue with a split screen 2 inch black line towards the middle of the screen and splits the os
    eventually crashes and reboots sometimes only white screening once a blue one. Funny though it will work fine on external monitor, Its not the lvds I checked that.
    I have a strong feeling this is just the gmux ? that is the chip used to switch back and forth from the integrated gpu right?, or has the chip gone bad again?



    I can't for some reason post the img url but I did find an exact issue on youtube that's showing the problem.

    Last edited by John626; 06-26-2019 at 02:24 AM.

  2. #2
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    Re: 820-2915 Split Screen works on external

    i would try another screen and lvds cable combo

  3. The Following User Says Thank You to kjchatman For This Useful Post:

    John626 (06-27-2019)

  4. #3
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    Re: 820-2915 Split Screen works on external

    Is there software needed with the r8911 removal this customer is needing a machine right away , disabling r8911 does not automatically force the internal cpu gpu to boot directly right?
    Last edited by John626; 06-26-2019 at 05:00 PM.

  5. #4
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    Re: 820-2915 Split Screen works on external

    Try reflowing the gmux chip, be sure to remove all the epoxy around the edges first.

    If tapping on the gmux area does anything, then it is most likely broken solder balls on the gmux, at least this is common on 820-2850 boards.

    R8911 removal is only for disabling the power to the GPU so the disabled GPU doesn't draw power and shorten battery life. You need to apply software fix first. For testing, just apply pram parameters fix and see if there is any difference.

  6. The Following User Says Thank You to mitchW For This Useful Post:

    John626 (06-27-2019)

 

 

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