Chosen Solution
I bought a 2nd hand MacBook Pro mid 2012 15" I tried using it before I closed the deal and pay for it, but when I tried it using again doing some regular browsing, the LCD flickered suddenly and I was shocked! When you move your cursor across the screen there’s green, purple flicker popping up, and as you move the cursor it disappears and reappear to another area of the screen, I tried using different browser, and went to different website thinking the websites heavy display causes the flicker but they don’t. I have found similar problem on this forum but the problem was not resolved and the probable causes was not determined. The guy who encountered the same problem also went to Apple Genius but looks like the Genius cannot find the problem too, they already replaced the logic board and LCD but the screen remained flickering. He also tried to use external monitor and FINALLY he doesn’t encountered the flicker issue. So do you think it has something to do with the LCD? I hope its not GPU issue like what MacBook Pro 2011’s common problem, where there are no permanent solution but only alternative which is reballing/reflowing. Any inputs is highly appreciated.
It sounds like you have a trackpad issue. Double check by using a mouse (USB or Bluetooth). If the problem is not visible using it then you’ll need to replace the trackpad and cable. If the problem is still present then you may have a GPU logic issue. But before you jump out of your skin here, There is more than one issue all of the dual GPU based systems have. The first is a tantalum capacitor that breaks down, some people assumed you needed to reball the GPU for this which is not the case. Then there is the GPU issue where the chip was cooked, running heavy graphics stuff the system was not designed to support (it’s a laptop not desktop!) The last possibility is a bad LVDS cable or the logic board connector got wet and is corroded. You might find reviewing Louis Rossmann’s vids helpful in understanding what happens and what you are facing here: 820-2850 with no video on screen; we’ve seen this problem before! Watch this vid: PUBLIC SCHOOL DISTRICTS USING MACS: let’s talk. The section thats important is when he starts talking about popcorning the logic board (3:00 minutes in). As you don’t want to cook your GPU like these CPU’s were!
Sounds like a bad LCD connector on the board level or possibly the video cable itself.
