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  1. #1
    New ROGer Array
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    Screen flickering and horizontal lines on G750JX

    I have a G750JX and have been having problems with my screen flickering for quite a while now and it seems to be getting worse. All my drivers are up to date and I can't seem to fix it, it doesn't show up all of the time and you can see it mostly when the screen is grey, it seems to be more prominent if I turn down the screen brightness (so I have to have the brightness up on 100% which is highly annoying).

    What's bothering me the most though is that these last couple of days I noticed that when I plug the laptop into my TV to watch Netflix the picture quality sometimes get horrible during action-packed scenes/scenes where people are moving a lot. Sometimes there's even horizonal lines across the screen, the kind of lines that can show up on old VHS-tapes. I don't know what to do to make this stop and I'm reluctant about sending it back because I'm worried that they won't see the things I see because the flickering is hard to spot at first and the horizontal VHS-lines problems only show up randomly when watching a movie. Also, I'm very dependant on a laptop and I'd hate to send it away and be without a computer for a month.

    Anyone else having problems? Have you fixed them and if so what did you do?

    Thank you for reading!

  2. #2
    ROG Guru: Platinum Belt Array hmscott PC Specs
    hmscott PC Specs
    Laptop (Model)Asus G750JH-DB71 (legacy)
    MotherboardAsus G750JH Intel HM87
    ProcessorIntel i7-4700HQ XTU Cores 36x/35x/34x/34x Cache 36x -50mV undervolt
    Memory (part number)Hyundai Electronics HMT41GS6AFR8A-PB 1.35v DDR3L-1600MHz
    Graphics Card #1Nvidia 780m Asus GPU Tweak OC 932mhz/6300mhz
    Sound CardRealtek v6.0.1.7469 driver
    MonitorAUO B173HW02 V1 Custom Refresh 85hz
    Storage #1RAID0 2x M.2 SATA Crucial MX200 512GB CT500MX200SSD6
    Storage #2Crucial 512GB 2.5" MX200 CT500MX200SSD1
    Power Supply230w AC Power Adapter 19.5v
    Keyboard Logitech k400 Wireless KB/Trackpad
    Headset Sony MDR-XB500 Wired and Sennheiser RS-220 Wireless TOSLINK
    OS Windows 8.1 + 8 Linux VM's + Windows 10 Technical Preview
    Network RouterAsus RT-AC68U DLINK DIR-655

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    Quote Originally Posted by Andie View Post
    I have a G750JX and have been having problems with my screen flickering for quite a while now and it seems to be getting worse. All my drivers are up to date and I can't seem to fix it, it doesn't show up all of the time and you can see it mostly when the screen is grey, it seems to be more prominent if I turn down the screen brightness (so I have to have the brightness up on 100% which is highly annoying).

    What's bothering me the most though is that these last couple of days I noticed that when I plug the laptop into my TV to watch Netflix the picture quality sometimes get horrible during action-packed scenes/scenes where people are moving a lot. Sometimes there's even horizonal lines across the screen, the kind of lines that can show up on old VHS-tapes. I don't know what to do to make this stop and I'm reluctant about sending it back because I'm worried that they won't see the things I see because the flickering is hard to spot at first and the horizontal VHS-lines problems only show up randomly when watching a movie. Also, I'm very dependant on a laptop and I'd hate to send it away and be without a computer for a month.

    Anyone else having problems? Have you fixed them and if so what did you do?

    Thank you for reading!
    If you have a Chi Mei screen you can set a Custom Resolution in the Nvidia control panel for 85hz-100hz and that will get rid of the Chi Mei flickering. I ran both my JW and JX at 100hz without problems, and verified with Asus tech support that it was safe to run at higher stable refresh. Some were able to run at 110hz, but the highest stable I could get on both screens was 100hz - 105hz showed sparkles.

    If your screen is an AUO, the highest refresh is 70hz.

    If you are seeing horizontal sparkles at 60hz, watch carefully at higher refresh, you might have a bad panel.
    Update: Like Prostar says below, if you have bad artifacts on internal screen and external screen it is likely a faulty video in the laptop - file a Technical Inquiry with Asus with the details - possible RMA.

    Let us know what you find.
    Last edited by hmscott; 05-01-2014 at 10:26 PM.

  3. #3
    ROG Guru: Orange Belt Array Prostar Computer's Avatar
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    There's a good possibility the video card is defective. Display problems on both internal and external displays often necessitates a repair on or replacement of the card.
    We customize Asus, MSI, and Clevo laptops!

  4. #4
    ROG Guru: White Belt Array
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    you have probably a Chi-Mei screen.

    horizontal lines with those are usually seen with old Nvidia drivers. but you say they are updated ?

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