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DIY UV Treatment for Yellowed MCU Screen

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

  1. ucmndd

    ucmndd Well-Known Member

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    It’s basically a hobby light - something you’d see in a haunted house or rave. ;)

    Probably don’t stare into it or anything, but I’d likely not classify as being as dangerous as gasoline vapor.

    It’s a 50 watt lamp. For reference, sunlight emits about 32 watts of UV radiation per square meter at ground level.
     
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  2. dark cloud

    dark cloud Active Member

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    A few years ago at the dentist he stuck a UV light in my mouth to cure the filling.
     
  3. Naekuh

    Naekuh Member

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    @cduzz i think you are thinking the uv lamps found in uv sterilizers.

    The UV lights the poster uses are party lights, almost on the same league as a black light you find in houses to make things light up.

    The only thing i would really worry about is photo bleaching something with the light, hence why he covered up as much as possible with a towel.

    There is also the probability he could of nuked the LCD's but were assuming the curing glue would of absorbed most of the UV before it got to that.
     
  4. MichaelP90DL

    MichaelP90DL Active Member

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    I don't get it either, but Tessie's screen is perfect. So far.
     
  5. whitex

    whitex Well-Known Member

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    They have machines deployed now, do you think they are not safe to use? So your theory is that the reason why they don't have one in each service center but ship it from SC to SC, and the fact that they don't replace worn-out or broken ones, is because they want to only expose a limited number of employees at a time to the risk of being blinded? :confused:

    Btw, here is one simple technical solution: Make a "UV baking drawer" sized to fit the display. Procedure is to remove the display, stick it in the drawer, let it bake. The drawer has safety interlocks which will not turn on UV until closed and turn it off if drawer is opened. Add a timer for convenience. Done.
     
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  6. whitex

    whitex Well-Known Member

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    2015 screens didn't have the yellowing problem - they had the bubbles in the screen and leaking goo problem instead. I have 2015 and 2018 cars at home, 2018 developed a yellow screen, 2015 (now out of warranty) screen still ok, though I know the bubbles are likely comming, so might seal the screen when I take it out to replace the emmc soon.
     
  7. whitex

    whitex Well-Known Member

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    The solution to "wear out" is replaceable UV light-bulbs. Or is changing light bulbs a foreign concept to Tesla designers?
     
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  8. ucmndd

    ucmndd Well-Known Member

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    I suspect based on the images we’ve seen of the tool and the reported power requirements and time to service a screen, they’re using an array of rather powerful LEDs, which is undoubtedly more complex to replace/service than unscrewing a light bulb.

    Certainly not impossible, but another reason why deploying a commercially viable solution needs time. At some point you need experience in the field to test longevity and performance before you manufacture base units and consumable parts at scale.
     
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  9. TonyT

    TonyT Member

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    Well I have a spare screen I plan to just shine the light on and cover up everything around it in my garage. Will see how it looks after... What's the worse that can happen?
     
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  10. D.E.

    D.E. Uncorked

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    Why not try sunlight? There’s about as much UV on an overcast day as a clear day. I’ve used overcast daylight to cure optical cement for a telescope lens. If your screen is out of the car, it seems it might be easy to put it outside for a day. I’d love to know if sunlight will eliminate the yellow.
     
  11. Country Roads

    Country Roads Member

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    I'm on pins and needles. Let us know how the second treatment goes. Tired of waiting for the service center to call me in to get it fixed (again; screen already replaced once).
    Appreciate
     
  12. ucmndd

    ucmndd Well-Known Member

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    It’s cold outside and my wife got home first and stole the garage, but I’ll give it another go in the next couple days. Will definitely post a follow up. :)
     
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  13. FlatSix911

    FlatSix911 Porsche 918 Hybrid

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    Well done!
     
  14. cduzz

    cduzz Member

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    #34 cduzz, Nov 25, 2019
    Last edited: Nov 25, 2019
    A little more research on my part -- the lights that were used to erase eproms "back in the day" were "UV-C" lights under a hood that had a little mechanical safety switch to keep the bulb from coming on unless the hood is closed. Nasty nasty stuff.

    If these lights necessary to cure the screens are lower energy / longer wave-length UV, so much the better.
     
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  15. dannycamps

    dannycamps Member

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    I figured it was only a matter of time before someone came up with a DIY solution to this. Kudos to the OP. Now as to why Tesla is so slow in rolling this out, there are other costs involved. For this procedure to work, the car has to have the device attached to the screen for several hours uninterrupted This means the car being treated will tie up a service bay in an already crowded and overbooked service center (e.g. fewer cars can be serviced in a day, lost fees/labor).

    You could argue that they can treat these cars overnight (or outside) but I wouldn't be so willing to leave a UV death ray machine that supposedly runs very hot unmonitored in an area surrounded by a bunch of cars with lithium battery packs that do not seem to like fire too much.

    The other problem is that Tesla has to fabricate this UV tool. Elon can't just walk to the local Sears Auto Center, see that it's out of business because Sears is a near-dead brand, then head to AutoZone to buy this thing. I'm sure it's not cheap to produce and if they have a high-rate of failure, it only increases costs exponentially.
     
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  16. TonyT

    TonyT Member

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    I was thinking about that also. Guess our glass has a lot of UV protection, but I was wondering why it yellows and we use UV to get rid of the yellow.
     
  17. TonyT

    TonyT Member

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    I've think I've seen a screen that bubbled and yellowed... :(
     
  18. MichaelP90DL

    MichaelP90DL Active Member

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    You folks are giving me a lot to not look forward to. LOL

    So far, for some unknown reason, no yellowing, no bubbling, no oozing goo. Nothing. However, "tomorrow is another day" (--Scarlett O'Hara).
     
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  19. cduzz

    cduzz Member

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    People rarely come to an internet discussion forum to report that nothing noteworthy happened to them today.

    Today, I got in my car and drove it to work.

    The battery (the worst 90 pack formulation) is still at the same capacity (or slightly better) than when I bought the car 6 months/5000 miles ago. 250 miles at 90%.

    The screen worked; it's a little dusty and has a bunch of finger prints.

    The door handles came out when I walked up to the car; I tugged on the handle and the door opened.

    The extremely minor squeek from the side of the passenger seat against the center console continues to make a tiny amount of noise when my son moves around.

    The AC worked without the fuse blowing and defrosted my windows.

    I drove the car in reverse several times while I was turning the steering wheel and the suspension did not fall apart.

    I listened to several podcasts using the built-in MCU1 and the 4 year old emmc did not wear out stranding me.

    I plugged it into the free charger at work and the car is charging without the charging system failing.

    Another day another hail of fail avoided!
     
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  20. quickstrike12

    quickstrike12 Member

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    I love my car(going on 2 years now) and it’s been the best decision I made outside of my family. but OMG had I found this forum PRIOR to my purchase I would have maybe never even got one.
     
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