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Q: New iMac 27inch screen flickering/tearing/shutoff
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Jan 4, 2010 11:34 AMby Easybourne,edenorchestra wrote:
Its amazing, no matter what forum you are on, no matter what the subject is, someone starts arguing about something that has NOTHING to do with the original thread. Humans!
That's not true. And you **** well know it.
Anyway, today after a reboot, the insane flickering and blackouts that greeted me on my return to the office after Chrimbo have gone (for a while, at least). -
Jan 4, 2010 11:53 AMby ArMyZ,As I already wrote, mine is W46 i5 and it flickers/blackouts sometimes (no yellow tinge or traslated menu, let's see one time at a week or more and putting machine on stop for few seconds and resuming it back solves the issue for another week or such.
I don't want to send it back for eventual replacement (regardless of beeing out of 14 days) because I keep seeing w52-w53 with the same problem and usually worse than my actual w46.
I'll wait until Apple (no makumba, dance on odd tiles or woodoo solutions) will fix it or it will start an eventual retirement & replacement campaign.
Anyway, if I will bring my 27" to the Apple Store for repairing (as @ genius already told me) I'll check it there first of leaving the store.
Remember what is shown here http://imac.squeaked.com and what is being written into this thread: dead pixels, isight camera dead pixels, yellow tinge, HD fails are possible problems.
I suggest you all to test out with this app too: http://imac.squeaked.com/test.php and let us all know.
Just my 2 cents,
A. -
Jan 4, 2010 12:54 PMby Utsava,What is strange about this problem is that is has been reported across a range of different video cards (ATI Radeon HD 4850 and 4670) and screen sizes (21.5" and 27"). This could potentially support the theory that the problem is related to something they all have in common (and not the actual GPU and/or panel). Of course, the problem could be across ALL GPUs and panels, but this seems somewhat less likely. This rabbit hole of a theory leads to a few, maybe telling, questions:
- Do the 21.5" and 27" share common LCD circuitry/cabling that the problem could be attributed to?
- Has anyone experienced this problem with the base NVIDIA GeForce 9400M?
- The fact that people have seen flickering on an external monitor in tandem with the internal one, leads me to believe it's not related to the LCD panel itself. To the best of my knowledge, the panels internal connection to the logic board is similar to the DisplayPort signals that are routed to the external monitor. This makes it seem like the issue is in the signal output from the video card.
Just more speculation, but I thought this may further the discussion since Apple isn't saying much.
Message was edited by: Utsava -
Jan 4, 2010 12:43 PMby ArMyZ,Utsava wrote:
What is strange about this problem is that is has been reported across a range of different video cards (ATI Radeon HD 4850 and 4670) and screen sizes (21.5" and 27"). This could potentially support the theory that the problem is related to something they all have in common (and not the actual GPU and/or panel). Of course, the problem could be across ALL GPUs and panels, but this seems somewhat less likely. This rabbit hole of a theory leads to a few, maybe telling, questions:
- Do the 21.5" and 27" share common LCD circuitry/cabling that the problem could be attributed to?
I Don't know.- Has anyone experienced this problem with the base NVIDIA GeForce 9400M?
http://imac.squeaked.com/custom.php?graphics_card=9400M
Just more speculation, but I thought this may further the discussion since Apple isn't saying much.
That's the problem: no words from Apple -
Jan 4, 2010 1:03 PMby Utsava,Dino1956 wrote:
Yes! The NVIDIA GeForce 9400M 21.5 has the Problem as well. Opened iMac on Dec 25th. Just noticed Yellow Tinge. 5 Days Later, it starts Flickering. I run Onyx, stopped Flickering for 3 days & counting. These are my facts.
The fact that this same problem spans THREE different GPUs from TWO different manufacturers (NVIDIA and ATI) REALLY leads me to believe it's not GPU related.
Anyone know where the 21.5" and 27" panels are sourced from? The same manufacturer? Then again, if it was panel related, why would an external monitor exhibit the same problems?
The more I think about it, the more it sounds like a software issue. Who knows...
Message was edited by: Utsava - grammar -
Jan 4, 2010 1:26 PMby Richard Prescott,And there is where you are wrong.
iStat Pro reads the fans, does not limit things to a slider. While not the same, my Mac Pro has fan speeds (4 fans being read) in the 568-700 rpm range, ambient temp is 67 F, CPUs at 74, drives in 80s. Computer is generally idle for these readings, tho access is from back to my Mac. I have seen fan readings under 1200 rpm routinely when using iStat Pro. Fan Control is just that, something to actually control the fan speed to push more air. Ask them why their slider is bottomed at 1200 rpm.
Had a customer do the iStat cause he thought temperature was the problem, but it isn't. Fact to know, if temp gets too hot and is not cooled off the computers are firmware programmed to shut down. This cut off temp is around 185 F.
The power supply is about 12 inches from the heat sink for the video card, and about 8 inches from the video card where it connects to the logic board. The pattern is a large V with the power supply at one arm end and the video heat sink at the other and the video card at the bottom of the V. -
Jan 4, 2010 1:58 PMby Eric Fauque,Utsava wrote:
The fact that this same problem spans THREE different GPUs from TWO different manufacturers (NVIDIA and ATI) REALLY leads me to believe it's not GPU related.
Anyone know where the 21.5" and 27" panels are sourced from? The same manufacturer? Then again, if it was panel related, why would an external monitor exhibit the same problems?
The more I think about it, the more it sounds like a software issue. Who knows...
Message was edited by: Utsava - grammar
Very good point Utsava!
I agree with you that if the problems spans THREE different GPUs from TWO different manufacturers (NVIDIA and ATI) there next to no chance that it is GPU related, but more likely software related.That would be good news! (No physical repairs needed).
But it could also some other board or cable that is common to all models -
Jan 4, 2010 2:26 PMby NULCGI,Utsava wrote:
Dino1956 wrote:
Yes! The NVIDIA GeForce 9400M 21.5 has the Problem as well. Opened iMac on Dec 25th. Just noticed Yellow Tinge. 5 Days Later, it starts Flickering. I run Onyx, stopped Flickering for 3 days & counting. These are my facts.
The fact that this same problem spans THREE different GPUs from TWO different manufacturers (NVIDIA and ATI) REALLY leads me to believe it's not GPU related.
The more I think about it, the more it sounds like a software issue. Who knows...>
Yes... I tend to agree - I think its essentially a software issue, I have my doubts about the integrity of Snow Leopard. Also, the poor sods who have had two or three supposedly bad machines - may be causing their own situations - as a result of software they have installed or imported from previous machines.... and as a result - snow leopard is handling that faultily.
Its unlikely they all got so many consecutive machines (all with same hardware fault), although hardware failure could be relevant - if their machines were subject to rough handling or abuse.
I think Apple are smart enough and have sufficient resources to have determined - their machines were OK - when tested prior to leaving their assembly lines.
Yup I reckon its all to do with software... thats my 2 cents. -
Jan 4, 2010 2:36 PMby NULCGI,Dino1956 wrote:
If it were a Software Issue. That would be a blessing. Unfortunately, I think most of us do not believe that is the case. More likely to be a board or cable. The "Yellow Tinge" that I have, is just the Screen itself, I would think.
Lets not forget about rough handling (during transit) as possible cause to 'Hardware Failure'.... which is not exactly the same as 'Faulty Hardware' per say.
