27" Imac Display is Dim, No Longer Bright

Posted by: Biggerfoot

27" Imac Display is Dim, No Longer Bright - 06/08/11 10:09 AM

I have a late 2010 3.2ghz i3 iMac.

For six months, the screen has been nice and bright.

Now, it is very dim...like it looks before the screen goes to sleep.

I have done all of the usual steps:

Zapped the PRAM, left it unplugged for a night, booted into root user to check if it was a software issue, checked the profiles, ran f-disk, started it up with CD...all without any luck.

Of course, I also checked the display preferences.

Is there anything thing else I have overlooked?
Posted by: John Rougeux

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 10:18 AM

The brightness key on the keyboard?
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 11:47 AM

The brightness is turned up all of the way both in the System Preference and via the keyboard.

It does adjust, just dim and not that super bright like it was.

I have never had a LCD fail so I am not sure if it is just a backlight or the item that dims the screen prior to it going to sleep.

The screen looks like it does after it dims prior to it going to sleep.
Posted by: MacBozo

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 12:26 PM

Originally Posted By: Biggerfoot
The brightness is turned up all of the way both in the System Preference and via the keyboard.

It does adjust, just dim and not that super bright like it was.

I have never had a LCD fail so I am not sure if it is just a backlight or the item that dims the screen prior to it going to sleep.

The screen looks like it does after it dims prior to it going to sleep.

Got AppleCare?
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 12:55 PM

Originally Posted By: MacBozo
Got AppleCare?


Yep...they want me to do a erase install today. This is a work CPU and to find the time to do this is hard. I am hoping a quick fix is out there. However, I will have to face it if it does not correct itself soon (I can still use it a bit).

Of course, this is the only Mac here and I made a big deal about it to.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 01:01 PM

Wow.. that sucks. I would unplug it and let it sit for 10 minutes, completely unplugged.
Have you installed anything recently?
I hope it's not the bulbs going out, although typically the go out one before the other so it would be darker at top or bottom. Unless it's the inverter board acting up, then they could both be dimmed equally.
I have a hard time believing it's the board, but rather some 3rd party utility or something? Have you unplugged all 3rd party hardware?
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 01:03 PM

Also try changing your color profile.
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 01:17 PM

Originally Posted By: Biggerfoot
Originally Posted By: MacBozo
Got AppleCare?


Yep...they want me to do a erase install today.
That's crazy, I hate dealing with them. If you just boot off of the install DVD it should tell the story. If it's dim when booted off of the DVD it's not the installation that's bad, it's hardware. The backlight board (inverter board) is going bad.

Where do they get these "techs?" crazy
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/08/11 01:19 PM

It is dimmed equally.

I do not have any system enhances like Fruit Menu but will try unplugging the USB and FireWire stuff. Last night, I left it unplugged over night with no change.

I did try other profile, and even found one profile damaged that I had to repair via the utility but that did not help either.
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/09/11 12:12 PM

No luck with the unplugging overnight.

I guess the next step is going for an Apple Care repair...not going to be fun.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/09/11 12:18 PM

Did you boot off the DVD as Reboot suggested?
If it is ok from DVD boot then you know it's a software issue and that you have to reinstall. No sense going to the store to have them tell you that....
Posted by: John Rougeux

Re: 27" Imac Display is Dim, No Longer Bright - 06/09/11 03:18 PM

Originally Posted By: Biggerfoot

started it up with CD...all without any luck


I'm guessing he did
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/09/11 06:25 PM

Originally Posted By: John Rougeux
Originally Posted By: Biggerfoot

started it up with CD...all without any luck


I'm guessing he did
I missed that, thx.
Posted by: MacBozo

Re: 27" Imac Display is Dim, No Longer Bright - 06/09/11 07:11 PM

Are you wearing sunglasses? wink
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/10/11 04:12 AM

Originally Posted By: MacBozo
Are you wearing sunglasses? wink


At first I did check to see if my transitions glasses were still dark! It looked like I did have sunglasses on.
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/10/11 05:35 PM

I had Apple out today (nice that they make calls to my work) and it appears it is a logic board. It is supposed to be repaired late next week.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/10/11 08:03 PM

Cool.. !!!
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/18/11 07:48 PM

Well, they replaced the logic board and video card and still had the problem. They took the iMac away so I do not know what is going to be next. Hopefully, a new iMac with all of my Data restored.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/18/11 09:19 PM

Even if they don't replace it with a new one... they have to replace the screen now and this one will be like new!

Hopefully they just give you a new though...
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/19/11 10:28 AM

Oh, they also did replace the LCD too and for some reason the bluetooth module.
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/19/11 01:13 PM

Seems that they replaced about everything except the part that it probably is, the power supply (inverter) for the screen.

Gotta love 'em. smirk
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/19/11 05:10 PM

Yep.. inverter board would have been my FIRST guess. Actully.. we both said that already.. Strange they wouldn't know that....
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/19/11 05:38 PM

Originally Posted By: NucleusG4
Strange they wouldn't know that....
Not really. Makes too much sense, dim lights = low power. crazy

Oh well, bigger gets a full rebuild is the good side. grin
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/19/11 05:40 PM

Originally Posted By: Biggerfoot
...and for some reason the bluetooth module.
Missed that. WTH?
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/20/11 08:33 AM

Originally Posted By: Reboot
Originally Posted By: Biggerfoot
...and for some reason the bluetooth module.
Missed that. WTH?


The troubleshooting software pointed the the Bluetooth module. The tech stated they never saw the problem before hence the parts overhaul.

Not that it may make a difference, this was an Apple Refub.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/20/11 10:00 AM

Refub??
Doncha mean Reflub? smile

That actually works in your favor.. they will replace the machine when it gets to a point that it's a monetary loss for them to keep fixing it. And that refurb status means they have already fixed it once...
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/20/11 10:07 AM

Originally Posted By: NucleusG4
Refub??
Doncha mean Reflub? smile

That actually works in your favor.. they will replace the machine when it gets to a point that it's a monetary loss for them to keep fixing it. And that refurb status means they have already fixed it once...
True, there is usually the 3 strikes standard for that.
Posted by: Biggerfoot

Re: 27" Imac Display is Dim, No Longer Bright - 06/21/11 05:44 PM

Finally got it fixed...it was the inverter board. I guess they never had a 27" do that and they just followed the trouble codes. It is fixed for now and it was still a pain but at least they came to my office.
Posted by: Jim_

Re: 27" Imac Display is Dim, No Longer Bright - 06/21/11 07:16 PM

Originally Posted By: Biggerfoot
Finally got it fixed...it was the inverter board.
smirk
Quote:
It is fixed for now and it was still a pain but at least they came to my office.
That's the good part, at least you didn't have to lug it to Apple Store every time on top of everything else.
Posted by: NucleusG4

Re: 27" Imac Display is Dim, No Longer Bright - 06/21/11 07:23 PM

Cool beans.. and they left all that other new stuff in there... cool beans again.