smithrh

macrumors 68030
Original poster
Feb 28, 2009
2,557
1,308
My 27" display is flickering/distorting both intermittently and periodically.

That is, it flickers for a while (minutes or more) then for days the problem disappears.

When this problem occurs, I also see Console entries like the following:

6/15/15 11:31:16.000 AM kernel[0]: IOThunderboltSwitch<0xffffff804b8b7000>(0x0)::listenerCallback - Thunderbolt HPD packet for route = 0x0 port = 2 unplug = 0


I Googled, didn't really see much relevant to my situation.

Anyone with similar experiences?
 

iphoneuserinyyz

macrumors regular
Oct 11, 2011
129
15
My 27" display is flickering/distorting both intermittently and periodically.

That is, it flickers for a while (minutes or more) then for days the problem disappears.

When this problem occurs, I also see Console entries like the following:

6/15/15 11:31:16.000 AM kernel[0]: IOThunderboltSwitch<0xffffff804b8b7000>(0x0)::listenerCallback - Thunderbolt HPD packet for route = 0x0 port = 2 unplug = 0


I Googled, didn't really see much relevant to my situation.

Anyone with similar experiences?

Yes! This just started happening to me 2-3 days ago! I am not at home right now, so I can't check the corresponding console entries, but the behavior you describe is exactly what I am seeing. It is driving me nuts. Of course, the display is out of warranty now....
 
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smithrh

macrumors 68030
Original poster
Feb 28, 2009
2,557
1,308
Interesting, thanks. I'm wondering if it's actually software related.
 
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smithrh

macrumors 68030
Original poster
Feb 28, 2009
2,557
1,308
10.10.3, but I meant "software" in a generic way. E.g., it feels like a sw issue, and I really couldn't tell you why, just a feeling from troubleshooting dozens of issues over the years.
 
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jterp7

macrumors 65816
Oct 26, 2011
1,124
105
There's definitely something up with these. Brought it in and of course it's fine at the genius bar. Mine flickered and is now just off.
 
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smithrh

macrumors 68030
Original poster
Feb 28, 2009
2,557
1,308
Happened again today, this time it displayed some pixellated garbage then went entirely black.

Opened up the displays pref pane, it was still recognized there, but it remained black.

Unplugged the power for a few seconds, plugged it back in. After another 5 or so seconds after plugging it back in, it came back. I saw the IOThunderbolt switch console entries again when it blacked out - but nothing when I unplugged it from power.
 
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iphoneuserinyyz

macrumors regular
Oct 11, 2011
129
15
After a week of frequent flashing/blacking out, I decided to order a Thunderbolt cable to see if using an alternative connection would make a difference. Of course, from the moment I placed the order at apple.com, my display stopped flashing... I am hanging on to the cable for now to see if it acts up again, and then I will try the cable and report back.
 
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jterp7

macrumors 65816
Oct 26, 2011
1,124
105
There's definitely something up with these. Brought it in and of course it's fine at the genius bar. Mine flickered and is now just off.

I believe the issue is related to either my hub or the external hds. That said everytime i lose the tb display the fans on the tb would spin up. The last time it did not. Maybe just a tb fan issue?
 
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frankdogg

macrumors 6502
Mar 24, 2011
325
165
Mid-Wilshire LA
Don't know if this helps but with a Samsung monitor I had before it started flickering like everyone is describing. I found out that one of the capacitors needed replacing. It was easy to spot because it looked swollen compared to the other ones that were still good.

Anyone wanna open up their tbd and take a look?
 
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