iMac Intel 24" EMC 2134 and 2211

Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

332 Questions View all

Why does my screen have ~3/4" brownish shading on both sides?

iMac 24" ECM 2134

Block Image

  • Shows in all brightness and background settings
  • Capture screen does not show the brown
  • More pronounced discoloration on right side (maybe)
  • May be "growing"
  • Computer on all time unless away for extended time (rare)
  • Use moving screen saver till it goes in sleep mode (3-5 min.)
  • Cleaned screen - no difference
  • No direct sunlight on computer
  • Rest of computer works fine

Thanks for any help!

Answered! View the answer I have this problem too

Is this a good question?

Score 2

Comments:

+ very nicely stated question. The capture screen not showing brown limits the problem (GPU is fine). To confirm this please hook it up to an external monitor. Please look on the bottom of your stand to see if this is a 2.4 GHz or 2.8 GHz machine.

by mayer

Thank you. * 2.4GHz per "About This Mac" * Have 2002 13" Dell Inspiron with bad resolution * Don't think I have the cable to link them. ALTERNATE: iPad linked to iMac screen (with Splashtop) - No evidence of discoloration. [image|104371]

by diannaterry

Richard, is that the Snow Leopard install CD?

by diannaterry

Add a comment

3 Answers

Chosen Solution

I had really hoped someone else would jump in on this question. I'm fairly sure of what the problem is but would like to get some confirmation. To eliminate a couple of possibilities, start up from your system installation disk by inserting the disk and holding down the "C" key. See if the screen stays the same.

UPDATE - I personally have the 2009 2.66 24" iMac. Bring yours by tomorrow afternoon and I'll see if I can switch out the LVDS cable and the inverter and maybe even the screen to isolate the problem. My first guess on this is the screen. We can probably get a used one for about $450 and a new one for $700. The used would carry a 90 day warranty.

UPDATE

The screen was successfully replaced and all is well.

Was this answer helpful?

Score 5

Comments:

OK, I'll have it there at 1:00, if that works for you. Again, thanks.

by diannaterry

I'll be here.

by mayer

Switched a 2009 LCD with yours and no problems. There is no teardown on this machine so I'm taking photos to do a guide. Will try the LDVS cable exchange tomorrow and let you know.

by mayer

I've never smoked anything in my 67 years of life. My husband smokes, but because smoke is a migraine trigger for me, he has to go outside to do it. I live in an older neighborhood and the house was built 31 years ago. There are horse stables a few blocks away. I hope it's only something like that, though. I've been retired from Covenant Hosp. for 15 months. Before that, my husband may have smoked in the house. If that's so, it took a while to show up. Thank you very much.

by diannaterry

The smoking comment was not from me. I've never seen anything like that and I've cleaned a lot of smokey machines. Someone would have to have an ash tray right under the monitor. Your original system installation disk (gray ones) have a built in diagnostic just for your machine, not the Snow Leopard.

by mayer

Show 3 more comments

Add a comment

Maybe I'm too late, but I have the same question and I gave myself this answer: if you open the iMac, you may notice that two coolers is exactly behind the LCD, in the "brown zone". I think it's a overheating caused by hot air flow; in fact, when the iMac is powered on by only few hours, the brown shading is absent, or far less visible.

Was this answer helpful?

Score 1
Add a comment

You have to clean the inside of the screen. See iMac Intel 24" EMC 2267 Glass Panel Replacement.

Good Luck!

Mentioned Items

Was this answer helpful?

Score 0

Comments:

It was not on the screen but a bad LCD.

by mayer

Add a comment

Add your answer

diannaterry will be eternally grateful.

View Statistics:

Past 24 Hours: 2

Past 7 Days: 12

Past 30 Days: 26

All Time: 3,300