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Thread: Screen goes black for a few seconds when I hit the high beams. What can I do?

  1. #1
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    Screen goes black for a few seconds when I hit the high beams. What can I do?

    So, when I hit the high beams my 8" touch screen goes out for a few seconds. I guess the ballasts for the xenon highs send a voltage pulse that the screen doesn't like. The same thing never happens with the low beams though (also xenon). I tried capacitors from VVME but the problem remains. Any ideas what I can use to stop the voltage spike and keep my screen on?
    - Thorstein Klingenberg
    - Porsche 996 (911 from '98 to '05)
    - Flush mounted 8" TS in dash with laptop-based carputer, too much to list.

  2. #2
    Constant Bitrate meryan00's Avatar
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    try running the screen off of the 12V out from your PSU, most have a second line meant just for that

  3. #3
    MySQL Error soundman98's Avatar
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    your running some ebay hids right?

    i had that problem and part of my headlamp retrofit corrected it-- when i updated to using some morimoto digital ballasts.

  4. #4
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    I use a HP Elitebook and thus have no PSU to run the screen.

    No ebay, Porsche factory Litronics

    Replace ballasts... hmm, sounds expensive, but linky?
    - Thorstein Klingenberg
    - Porsche 996 (911 from '98 to '05)
    - Flush mounted 8" TS in dash with laptop-based carputer, too much to list.

  5. #5
    Maximum Bitrate kegobeer's Avatar
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    How is the screen powered; where is the screen getting the power - cigarette lighter, fusebox, directly from the battery?
    1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

  6. #6
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    Fusebox. Same curcuit that used to drive the Porsche PCM1 navunit.
    - Thorstein Klingenberg
    - Porsche 996 (911 from '98 to '05)
    - Flush mounted 8" TS in dash with laptop-based carputer, too much to list.

  7. #7
    Maximum Bitrate kegobeer's Avatar
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    I'm guessing those bulbs take more energy than your stock lights. Did you upgrade any relays when you upgraded the bulbs? I don't think it's a pulse, but a lack of electricity causing your blackout. Have you checked voltage at that fuse when you apply the high beams, to see if the voltage changes?
    1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

  8. #8
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    Yeah, again, these are factory lights. I'll try to measure the voltage, but I'm not sure the multimeter is fast enough to read the dip in voltage. Also, it had to be pretty severe for the screen to black out and I should have noticed that on the instrument lights as well. But good tip, I'll do some digging around.
    - Thorstein Klingenberg
    - Porsche 996 (911 from '98 to '05)
    - Flush mounted 8" TS in dash with laptop-based carputer, too much to list.

  9. #9
    Maximum Bitrate kegobeer's Avatar
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    Yep, I understand those are factory lights. But, if things worked prior to installing them, then something in those lights (voltage, frequency, etc) is causing the problem. What kind of touchscreen is it? If it's a Lilliput, do you still have the filter attached to the wire, or did you use a different cable? If possible, can you connect the screen directly to the battery, to rule out any interference/voltage fluctuations that might be the result of the fusebox?

    I had some weird issues powering my Lilliput from my fusebox, and they all disappeared when I powered it from a distribution block that's wired directly to the battery.
    Last edited by kegobeer; 10-12-2011 at 06:07 AM.
    1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

  10. #10
    Raw Wave
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    I'd try powering from the battery too. It's probably a voltage spike rather than "high" current induced (HIDs take less power than halogen etc).

    Else get ordinary caps and try across the screen supply else the ballasts.

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