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DIY UV Treatment for Yellowed MCU Screen

Discussion in 'Model S' started by ucmndd, Nov 24, 2019.

  1. powaking

    powaking Member

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    Hmm maybe I'll try this with the sunroof open, I mean it can't hurt to try.
     
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  2. Ken7

    Ken7 Member

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    We really need to stop these positive posts, it really does upset some on this forum. There's no place for Tesla praise on TMC. ;)
     
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  3. terryna

    terryna Member

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    #43 terryna, Nov 26, 2019
    Last edited: Nov 26, 2019
    Thanks for sharing,pretty cool[​IMG]
     
  4. D.E.

    D.E. Uncorked

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    You’d be exposing your upholstery to the UV so it is possible you might fade the exposed surfaces under the open roof.

    I’d suggested it because that fellow said he had an extra screen, so that could be put outside, flat, so getting maximal exposure. I doubt there will be enough UV reaching the screen if the screen is in the car and the sun roof is open. There is the time of exposure, the sun moves 15 degrees per hour across the sky, then there is the angle, since the light will be coming in somewhat near vertical, the amount of UV energy that strikes the near vertical screen will be very small. We could calculate it but I don’t think it is worthwhile. I suppose you could rig an aluminum foil reflector to redirect the sunlight, then keep moving it, but I think the best bet will be to buy one of those UV light setups described in the first post. I just can’t see sunlight being an option for a screen that’s still installed in the dash.
     
  5. kingtj

    kingtj Member

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    I'm really glad this was posted! I've been thinking about the merits of trying a DYI fix for my yellow border on my Model X screen ever since I saw a photo of the unit Tesla started using for the repair.

    I wasn't able to see what the actual bulbs looked like on it, since the pictures I saw were of the unit attached to a dash and actually in operation. But it basically appeared to be a metal box that fit almost perfectly around the display, with some kind of fasteners on the top and bottom to hold it in place. I saw it had several cooling fans built into it. I assumed maybe it used 4 UV florescent tubes placed around the inside edges of it so as to shine directly on the yellow parts of the touchscreen when it's attached to it. Could be they used a bunch of LED lights in it too, but seemed like that was making it more complex than necessary to me?

    Either way, I can see how the tubes would wear out after so many hours of use. I have a bug zapper that needs new tubes in it each season, after leaving it powered on after dark and off in the morning in the summer. Assume it's the same situation. The tubes still light up to the naked eye when you plug it in, but bugs stop being attracted to it -- apparently because the UV output diminishes.

    Aquarium UV light tubes might be just the thing to DYI something suitable.... My guess is, such a rig would direct the light much better to fix the problem than the unit shown in the original post here, that's just generally aimed at the screen while sitting on boxes?
     
  6. Jan Fiala

    Jan Fiala Member

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    Only screens made late 2016 are experiencing the yellowing ring. Older screens had its own issues. (leaking goo, bubbles)
     
  7. Fredneck

    Fredneck Member

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    "Wore out"??? That's possible and means the light bulb(s) quit. That's a pretty damn simple thing to fix in a service center. But then maybe this is technology that is a bit too advanced for Tesla.

    BTW, I read something on UV lights the other day, maybe it was a YouTube video by Big Clive, can't recall. But it talked about the different types of UV lights. Type A and B UV will light up your clothes and such, but mostly are not harmful other than long term exposure. The other form (UV-C) is very dangerous causing rapid burns and photokeratitis to the eyes. So if you make your own UV light fixture, be careful of which type of light is being generated and protect your eyes.
     
  8. Fredneck

    Fredneck Member

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    My expectation is that the problem is caused by inadequately cured glue in the assembly process. Over time it ages. There is no reason to think all cars will develop the problem since many displays were likely made correctly. Or it could be some other mistake in making the units, but it does not seem that all cars are affected. My car was built in July/Aug '18 and developed the problem less than a year later.
     
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  9. ucmndd

    ucmndd Well-Known Member

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    Update: Since the first post I've subjected the screen to another ~8 hours of UV treatment, splitting it into 4 "quadrants" and applying light directly to each one for ~2 hours each.

    I can say at this point that the yellow ring is almost completely gone - I'd say ~95% improvement. I honestly don't know if I'm still seeing a ring or my mind wants to see one - either way the whole experiment has been a great success. For $35 all-in, I'm extremely satisfied. If others find themselves in my post-warranty position or otherwise don't want to mess with the service center rodeo, go for it - you've got little to lose.
     
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  10. Dithermaster

    Dithermaster Member

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    I did that too! Motorola 6805 (I think) mostly. Yes, those erasing machine typically had mechanical interlocks so you didn't go blind. Got a little warm too.
     
  11. whitex

    whitex Well-Known Member

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    I still got one of those eprom erasers - it has a simple interlock (a small proximity switch cuts the power to the light bulb when drawer is not closed all the way). Even the timer is mechanical on it. Very simple design, worked well.
     
  12. bnsfengineer

    bnsfengineer Member

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    I agree! I don't want to drive down there, leave my car and drive back. Its worth it to me to diy and spend $35
     
  13. GoBlue88

    GoBlue88 Member

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    Really appreciate this thread, thanks OP.

    My 2014 Model S had the "bubbles and goo" issue. The entire MCU was replaced in 2017 under warranty. And guess what showed up last week? Yeah - the yellow border issue. Great.

    Gonna try the new Carlsbad service center first. Anybody know what the service center will charge for this if you are out of warranty? If they can't do it, or want to charge an exorbitant amount, I will try this DIY solution.

    screen.jpg
     
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  14. cduzz

    cduzz Member

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    How difficult would it be to make a 3d printed holder for these UV lights? I'm thinking that a thingaverse recipe and a shopping list of UV lamps on amazon would be a neat contribution.
     
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  15. whitex

    whitex Well-Known Member

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    Difficulty level depends on how universal you want it, specifically what max size parts you can print (remember, the screen is large, so the holder is likely to be large). Then the challenge would be to design it so all parts go together and it works well - sounds like a mech eng challenge.
     
  16. Fredneck

    Fredneck Member

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    The holder could be a frame made out of some kid's construction toy. The lamp would be attached with some minimal amount of 3D printed clips and the lamp purchased from eBay... hmmm... maybe I'll get on that.

    Is the bezel for the display the same in the S and X? Does this happen in the model 3? I suppose the model Y will have the same display as the 3, no? That could be a simple hook over the top of the display.
     
  17. cduzz

    cduzz Member

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    Are suction cups a bad idea for these sorts of screens?

    Entirely speculation but an assembly made up of one of these and a suction cup and a some 3d printed clips to hold the mess together may be sufficient to reverse the yellowing one side / section at a time.

    [​IMG]
     
  18. asterothe

    asterothe Member

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    Would you keep posted about your experience? I have the same issue and in the area so need to know how they handle. I still have warranty though.


    Thanks!
     
  19. GoBlue88

    GoBlue88 Member

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    Will do. Update 1: showed up at Carlsbad yesterday only to find out they don't have the machine that repairs it. Now have an appointment at San Diego on Dec. 17th. :mad:
     
  20. Joelgjr

    Joelgjr Member

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    I just ordered this from Amazon. Thank you
     
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