跳转到主内容

Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

708 个问题 查看全部

iMac 2011 Randomly Restart. Graphics Issue?

My iMac keeps restarting randomly. Often just seconds after power up and sometimes after a long time. The screen simply goes black and then I hear the boot chime. I saw several topics about this issue with mid 2011 27" iMac and I don't really know what to do.

Is this really a graphics card failure that restarts my iMac randomly? (Radeon HD 6970M) Am I stupid to go and spend $250 on another one and try?

EDIT:

I've removed my GPU card

Block Image

Block Image

EDIT 12-16-2017

Block Image

Block Image

Block Image

已回答! 显示答案 我也有这个问题

这是一个好问题吗?

得分 0
2条评论

Please tell us what happens when you boot using (Safe Mode) by holding down the Shift key on start up.

完成的

Boot seems to be normal. The system appear to be a little slow, for example, when I hit the lauchpad

完成的

添加一条评论

2个答案

已选择的解决方案

The GPU was a well known recall, see if your serial number matches those listed here:

https://9to5mac.com/2013/08/16/apple-ope...

这个答案有帮助吗?

得分 2

12条评论:

Yes, it matches! Mine is DHJQ.

Can I fix it just reballing the GPU?

完成的

@arkcyd I've reflowed about a dozen of these with a hot air workstation and only have one failure in the last couple of years. That failure was right off the bat.

完成的

@mayer Applying hot air right over the GPU? How many degrees and how many time?

完成的

I do it until I see the solder flows.

完成的

Cool, I gonna try

完成的

显示更多的7条评论

添加一条评论

I know that this is an old thread but the video card can be reflowed again. We have done this with our 9 zone SMT oven with success on 10+ iMACs. The fix does indeed work. Reballing the GPU is not required. Been working for weeks to date. The bars are gone and the machine is once again stable. Some claim that this is a temp fix but keep in mind that it likely took years after the initial purchase for this failure to surface. Also strongly blaming the caking up of the heatsink compound on the video card and CPU for these issues. We are removing the old heatsink paste / pads and replacing with the latest and high grade pads from T-Global (Taiwan) - digikey carries these in varying grades. The thermal properties is much higher than other off brands. After the process, notice how cool the back on the iMAC enclosure is as compared to before this exercise.

这个答案有帮助吗?

得分 0
添加一条评论

添加你的答案

arkcyd 将永远感激不已
浏览统计数据:

过去 24 小时: 0

过去 7 天: 2

过去 30 天: 5

总计 3,541