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Thread: frustrated with lcd monitor.

  1. #1
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    frustrated with lcd monitor.

    so after countless hours of fabrication, i'm at the final stage of my installation. putting the computer into the car. i'm having nothing but flicker from the lcd screen. i don't remember what brand my lcd is, but i know it's not the screen. i have the screen connected to the indash dvd player and everything is fine, the screen doesn't flicker or anything. then i hook it up to my computer through the computer vga, and DAMN, it flicker like crazy. you see white wavey lines. it's driving me nut. so i read on here and people suggest cutting out the egg and using the computer power supply, and it still persist. why? i try running a ground line directly from the negative terminal of the battery and then connecting all my electrical to that and STILL it flicker. flicker only occur when the wallpaper or background is dark. what can i do to fix this. i might just try to bring a monitor to my car and hook it up to the vga to see if the flicker is still there. maybe it's a bad vga cable. any help would be appreciated.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Are your power cables running close to the video signal cable?
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    power cable

    the power cable is running on the opposite side. is there a way to test this? i was planning on using my laptop video signal with the video cable to see if the image will flicker. don't know would that be indicative of anything. i never thought i would have this much problem installing it in the car. is there such a thing as a video ground loop?

  4. #4
    Variable Bitrate
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    What resolution and refresh rate are you sending the monitor from the laptop? Wavy lines and such can sometimes be a sign of a resolution or refresh rate that is too high for the monitor. Try 640x480 at 60 Hz and see if that helps.

    Peace.
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  5. #5
    Constant Bitrate
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    what's the lenght of vga cable? what's refresh ratio? (for any LCD 60Hz is more than enough), and at last, it woild be helpful if you find out what was the brand, for example, lilliput can do 640x480, 800x600, 1024x768 just fine, but if I use framebuffer modes with unusual res/fefresh, it will flicker (some BIOS-es will flicker too, the ones with mobo logo ).

    Did you modify original vga cable? if it has additional connector, make sure the ground is fine.

    If you modified vga cable, make sure that hsync and vsync were not swapped.
    EPIA TC 1G 256MB 60GB Linux,WindowMaker, Roadnav, Xine, XMMS, iGuidance3
    Lilliput 8", Pharos i360, WUSB11v2.6 WiFi

  6. #6
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    okay. i was thinking that it might be the cable but i think it's not the cable. the reason i say this is because i used my laptop vga out port and it works fine. no flicker when the wallpaper is black. but when i connect it to the computer, damn flicker again. the native resolution is 800X600. here is a link to the lcd screen. http://cgi.ebay.com/ws/eBayISAPI.dll...ayphotohosting. any other idea guys? i'm beginning to think that my motherboard or video card (video card is part of the motherboard), not being grounded since i'm using a wood case. dont' know if that is possible, but i noticed when i was using a crt monitor inside the house, i'll get a little flickering too. if that's the case, how do you ground the motherboard? i don't think it's the refresh rate either because i'm using 60 hz. hmm. this sucks. oh guess what, i have problem with my m2-atx card now, it'll try to start and then shuts off. i have to use the switch to turn it one. one problem lead to another. how NOT fun.

  7. #7
    Constant Bitrate
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    in general, notherboard should not require grounding, all the ground lines should be supplied on circuit board. what you need to find out is that refresh rate makes any difference, try it on crt monitor, it will give you some results. try 60, 70, 72 Hz on crt monitor, and find out if it makes any change, if so, it means that graphics controller (card - built in) has a problem, if not, I would look at connectors, cables, etc.
    refresh ratio will change results on crt screen if video memory is faulty too, try to adjust bios settings for memory timing in such case, set it for lowest or default parameters to find out if it makes any difference. I assume your video controller uses system ram (shared memory).

    also you said "little flickering" when you use crt monitor, can you specify if it's ocassional flickering or constant, and if quality of video is ok or blurry.
    I'm trying to find out if your cable is noisy or faulty too
    EPIA TC 1G 256MB 60GB Linux,WindowMaker, Roadnav, Xine, XMMS, iGuidance3
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  8. #8
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    i did try the different refresh rate and did notice differences. and when i say flicker, it's wavey white lines across the screens. the picture is not distorted or anything. it's hard to explain. what imma try next to prove that it's the video card was to connect a monitor to it and see what happens. see if there's going to be any wavey lines on the computer.

  9. #9
    Constant Bitrate bluehcc's Avatar
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    this has to do with your power supply. I am currently experience this too but not much.. If i run my laptop with battery power, i get no flick and no sound noisy as soon as i plugged-in 19volt from carnetix p1900, all the weird thing out, not sure what exactly is going on, hasn't figure out the solution yea
    2006 Camry
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  10. #10
    Constant Bitrate
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    what kind of power supply do you use? is it stabilized 12V, well filtered? Try few different ways to power the screen, wavy lines may come out of not filtered current. let's say 12V out of computer power supply should do the job. also make sure ground of screen power and ground of your motherboard should be jumped together.
    EPIA TC 1G 256MB 60GB Linux,WindowMaker, Roadnav, Xine, XMMS, iGuidance3
    Lilliput 8", Pharos i360, WUSB11v2.6 WiFi

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