Ga door naar hoofdinhoud

Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

333 Vragen Bekijk alle

Do all screens on these iMacs turn yellow?

I want to replace the screen, but it seems they all turn yellow at some point …

My screen reference is LM215WF3 (SD)(A1)

Update (07/12/2019)

I’ll try to fix it it, and if it fails, I’ll go for a SD B1. Big thanks from Belgium @oldturkey03 and @danj for those precious advices ! :)

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

Is dit een goede vraag?

Score 1
Voeg een opmerking toe

2 Antwoorden

Gekozen oplossing

They do! But not in the way you think!

The backlight LED’s over time burn the reflector frame they are held in (yellowing it). While not easy you can get to your backlight assembly and fix the issue placing a new foil reflector in.

Update (07/11/2019)

Follow this guide iMac Intel 21.5" EMC 2389 Display Replacement

If you’re nervous on taking the display apart here’s the needed part iMac 21.5" LCD Display (11) Used - Apple P/N 661-5934, Display P/N LM215WF3 (SD)(C2) This is the newer version.

As far as taking the display apart the best I can offer is this drawing

Block Image

There are no available parts and if you don’t damage anything you’ll be OK. Once you get the frame out you can mount a strip of Aluminum foil tape (metal flue/duct tape) replacing the cheap paper foil LG used and clean the LED’s with 85% Isopropyl alcohol.

Update (07/12/2019)

@oldturkey03 - FYI: This is the newer version of the display LG - LM215WF3 (SD)(C2) it has the better backlight design.

Update (07/21/2019)

Here’s another view of the backlight LEDs

Block Image

Block Image

On this series the white plastic has become yellowed and you can see the foil surface burnt.

Was dit antwoord nuttig?

Score 5

Commentaar:

Ok, but where can I get the parts ? Is there a tutorial ?

door

@danj - I have the exact same panel, with the bottom half of the screen being yellow. I have removed iMac panels before, so no concerns there, but I'm a little unsure on how you use the aluminum foil tape to replace the foil LG use. The best teardown video I can find is of people cleaning between the LCD and backlight filters (like this: https://youtu.be/ziN5KhzshcI).

Could you possibly point out what part in the illustration you provided is the paper foil? Is it one of the sheets, or is it attached directly to the backplate? Thanks.

door

check my update

door

Thanks for that update Dan - I finally managed to attempt this today with mixed success. I replaced the burnt foil with aluminium tape as suggested, but it hasn't resolved the issue (it may have reduced the issue, but not by a lot).

I wished I had paid more attention when I had it all apart, but my suspicion is that the white plastic sheet (or one of the other sheets) at the back of the panel is also discoloured. If it is the case, I suspect this will be harder to replace or fix.

The only other thing to note is that the led lights were yellow - the isopropyl alcohol didn't really clean them up at all. I assume if this was causing a discolouration it would impact the whole panel, not just the bottom half.

door

Luke - In my searching I came across this - lm270wq1 backlight LED boards While its for a 27" panel I would contact them to see if they also sell the 21.5" panel LED's

door

11 commentaren meer tonen

Voeg een opmerking toe

unless you already have a replacement I would consider using a LM215WF3(SD)(B1) instead. It has the same connections and the same connector. The output to the LED’s has changed and it’s a crisper display with less likelihood of yellowing. the datasheets for those panels are posted with the answer to this question Expert advice on using 2009 lcd on mid 2010 logic board

Was dit antwoord nuttig?

Score 2

Commentaar:

So I have to solder something ? I'm not an expert :(

door

No soldering etc. involved to replace the panel. That is a strict exchange. If you want to tear things apart it's a bit trickier but still doable. Problem will be finding the right replacement parts (reflectors) etc.

door

Voeg een opmerking toe

Voeg je antwoord toe

Bertrand Bourguignon zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 5

Afgelopen 7 dagen: 23

Afgelopen 30 dagen: 83

Altijd: 1,763