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DIY UV Treatment for Yellowed MCU Screen

tcoombes

Supporting Member
Jan 22, 2018
1,060
3,296
Northern California
Closer and more UV bulb or LED wattage will cure faster, but further distance and/or lower wattage will cure eventually. Direct, unfiltered sunlight will also cure eventually, but at a much slower rate. I set mine box up for unattended full screen coverage and had my UV LED bulb far enough away from the screen to cover all of it. I also lined my box with aluminum foil for reflection (being careful not to allow the foil to get near the bulb socket). Full cure (as far as I know) was a total of about 12 hours with this setup. I will find out for sure if it was fully cured next summer when it warms up. If the yellow returns, I will cure it some more.
 

wildag

Member
Jul 3, 2017
112
226
Fairfax, VA
Mine was a full screen projection setup. Let it run for 10 hours and it only slightly cured part of the screen. I suspect the very low air temp had an effect. Will try closer in quadrants.
 

FrenchJim

New Member
Jul 25, 2018
3
2
Raleigh, North Carolina
My SC fixed as part of an accident repair and mistakenly tried to charge me for it with the other chargeable repair. The cost for them to fix it is only $35. Still, they removed that from my bill since it was under warranty.
 
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dgpcolorado

high altitude member
Apr 25, 2015
2,512
3,408
The Western Slope, Colorado
My SC fixed as part of an accident repair and mistakenly tried to charge me for it with the other chargeable repair. The cost for them to fix it is only $35. Still, they removed that from my bill since it was under warranty.
When I mentioned that I was thinking about a DIY UV treatment someday, my mobile service tech said that he thought that the first UV treatment at a service center was free, even for out-of-warranty cars. For me, the hassle of going to the service center 300 miles from home isn't worth it unless I have another reason to pay them a visit. (My brown edge on the MCU is fairly mild and doesn't bother me much, so I won't be treating it anytime soon. It appeared after my car sat out in freezing temperatures for four days, which I thought was odd.)
 
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TechOps

Member
Jun 4, 2017
202
224
Austin, TX
Cool project! I had my screen treated at the SC last week, and just wanted to say that the outcome was great, looks way better now, and I encourage anyone who's waiting, just go have them do it. For those OOW or far from SC, this is an intriguing alternative.
 

wildag

Member
Jul 3, 2017
112
226
Fairfax, VA
I previously tried this technique with a box that held the light 9 inches from the screen for 12 hours. That very subtly faded parts of the yellow lines. So I made a smaller box that covers only about 1/4 of the screen, and positions the light about 2 inches above the screen. I left that running for 16 hours. The yellow for the direct coverage area is completely gone. So it’s going to take 4-6 days to remove all the yellowing. But still glad to ha e this option in case it returns in the future.
 
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Cutwolf

Member
Aug 8, 2013
58
7
USA
Can mobile service do this? I just made an appointment through the app for this issue and it allowed me to schedule mobile service.
 

Nobleman

Member
Sep 11, 2018
15
17
Missouri
As straight forward as this seems, there must be some sort of user error on my part. After about 9 hours of exposure (3 sessions for 3 hours at a time) using the same light from Amazon listed by the OP the yellow band actually appears to be worse off and is darker now. Wife and kids all seem to agree that it looks worse as well. Long shot here but does the yellow band get darker before it fully cures after which point it will then fade away?

I had the same thing, after the first treatment, the yellowing was way worse. I then changed my setup and put the light way closer to the screen and left it for 12 hours and it was 100% better. This is working a whole lot slower than others have posted but after more tries it is gone on some parts of the screen and much lighter on others. I think after a few more long treatments moving the light around the edges, it will be back to normal. My advice is to keep trying and as others have mentioned, put the light really close to the screen.
 
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Mystique

New Member
Jun 25, 2019
2
5
Knoxville, Tennessee
I can report that the XICHEN UV "Nail Dryer" that Blue X90 posted about using (on Dec. 28 '19) works! Unfortunately it's currently listed as unavailable on Amazon.

I can also report that I first purchased this 60W LED light that looks virtually identical to some that are said here to have worked, but it did ABSOLUTELY NOTHING for me. I don't believe the wavelength spectrum is short enough, but I don't see anything about the spectrum for the nail dryers, except that they must use the same spectrum required here.

Just FWIW. It might save you from having to return one of these party lights back to Amazon, which is what I'm now doing.
 
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Mystique

New Member
Jun 25, 2019
2
5
Knoxville, Tennessee
Addendum: I now see the fluorescent tubes in the nail dryer that is effective are labeled as being 365nm (though that was not found in the product description). The party lights are typically 380-405nm. I think that's the problem with them; they're too high.

Be careful with 365nm, though. It's not eye safe.
 

Christran12

Member
Dec 2, 2019
9
4
Anaheim Hills, CA
Is it me or does this happen to MCU2 screens more often than MCU1? Mine is a MCU1 and doesn’t have it, my buddy’s the same. But I’ve driven three loaners, all with MCU2s and every single one has the yellowing borders...
 

kdday

Active Member
Oct 29, 2016
1,159
2,561
AZ
Is it me or does this happen to MCU2 screens more often than MCU1? Mine is a MCU1 and doesn’t have it, my buddy’s the same. But I’ve driven three loaners, all with MCU2s and every single one has the yellowing borders...
Yes. That’s correct.
 

whitex

Well-Known Member
Sep 30, 2015
6,453
7,641
Seattle area, WA
Is it me or does this happen to MCU2 screens more often than MCU1? Mine is a MCU1 and doesn’t have it, my buddy’s the same. But I’ve driven three loaners, all with MCU2s and every single one has the yellowing borders...
Yep. I've had 3 MS with MCU1 with no yellow screen (owned for 1,2, and 5 years), and 1 MCU2 car which yellowed within a year.
 

MP3Mike

Well-Known Member
Feb 1, 2016
15,332
33,245
Oregon
Is it me or does this happen to MCU2 screens more often than MCU1? Mine is a MCU1 and doesn’t have it, my buddy’s the same. But I’ve driven three loaners, all with MCU2s and every single one has the yellowing borders...

A lot of MCU1 screens leaked and formed bubbles between the display and touch panel.
 

ucmndd

Well-Known Member
Mar 10, 2016
6,391
11,901
California
Is it me or does this happen to MCU2 screens more often than MCU1? Mine is a MCU1 and doesn’t have it, my buddy’s the same. But I’ve driven three loaners, all with MCU2s and every single one has the yellowing borders...

It's less a matter of MCU1 vs MCU2 and more pre- vs. post-2016 refresh. The nosecone MCU 1 cars (before April 2016) have the screen that bubbles and leaks goo. The refresh MCU 1 cars (after April 2016) have the updated screen that yellows.
 

RichieB

Member
Oct 27, 2017
787
498
Netherlands
Is the root cause of the yellow colouring known? Since it is only on the sides I kinda assumed it is the glue that holds the glass to the screen that is not UV-resistant enough.
 

SucreTease

Teslarian
Jul 11, 2017
715
1,050
Huntsville, Alabama
Is the root cause of the yellow colouring known? Since it is only on the sides I kinda assumed it is the glue that holds the glass to the screen that is not UV-resistant enough.
The problem has been cited as incomplete curing of the adhesive during manufacture, leading to yellowing over time with exposure to oxygen. Additional curing with UV light eliminates the yellowing.
 

tcoombes

Supporting Member
Jan 22, 2018
1,060
3,296
Northern California
The problem has been cited as incomplete curing of the adhesive during manufacture, leading to yellowing over time with exposure to oxygen. Additional curing with UV light eliminates the yellowing.

Yes, it is the liquid optically clear adhesive (LOCA) that cures through an electrochemical reaction with specific wavelengths of UV light. There are different brands and types of LOCA that cure differently, have different shelf lives, and have different additives to prevent discoloration. Not sure which of those specifically led to the yellowing of MCU touch screens, but may have been lack of initial or incorrect UV cure, old LOCA, lack of proper additive, or a combination.
 

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