MacBook Pro Retina 15″ A1398 Turn-Offs During Work Process
MacBook Pro Retina A1398 appeared in mid-2012. He was the world’s first laptop with retina screen. The display, compact size, low weight and effective operation system made it uncompetitive. These retina screens are still very popular and up-to-date in performance.
Why This Happens?
Upon exiting the sleep mode, Mac initializes the GP unit again. It cannot find the discrete graphic, but recognizes integrated (‘on-board’) Intel HD4000 processor. Mac Laptop starts using it, and works until the next shutdown or reboot. If we take a look at the system report, there will be no sign of discrete GF650 video card there.
What breaks down there
I will give you a clue: the problem hides within one of the feeder chains. Here’s the logic: with no power supply microchip shuts down.
How To Fix It
The repair process comes down to local replacement of a defected component. We do not touch, braze or heat up any BGA microchip so the result is really reliable. And of course it costs much less than GP unit replacement. If you remember, microchip replacement is really dangerous and is not helping in such case.