Mycomputerworks & Macrehab Specialists in Macbook graphics repair
1 – Macbook Pro 15″ retina 2012 – black screen fix
The 2012 and 2013 15″ retina Macbook Pro suffers a different issue from the late 2013 – 2015 retina Macbook pro. On turning on the machine you’ll hear it chime, the magsafe light will activate and after a short while when it’s booted you will be able to turn the caps lock on and off. This shows that the Mac is running, just no image to the screen. Sometimes it will turn on with the screen working fine and after a short while it will just go black. It’s often diagnosed as a graphics chip issue, which technically it isn’t, it’s an issue with the chip that supplies voltage to the graphics chip called U8900. The solder turns ‘mushy’ in time and separates from the logic board resulting in a black screen. We remove the old solder from the chip and add nice new fresh solder fixing this issue permanently.
Macbook Pro retina early 2013 on test using 3D benchmark software pushing the Mac and it’s graphics to the limits to test it properly post fix.
2 – Macbook Pro 15″ retina late 2013 – 2015 black screen fix
Although it may appear a similar issue to the 2012 – 2013 15″ Macbook Pro issue it’s actually quite different. This issue will show itself when it’s under relativley light load and pretty much idling – So browsing the internet or emailing or what have you and the Mac will just switch off. Often it will allow you to turn it back on again after a short while, there may be random restarts and even kernel panics.
In time the mosfets that supply the correct voltage to the processor (CPU) degenerate due to heat stress and eventually such a degraded state it’s not able to supply the exact voltages required in some states of use. It may well be fine doing eavy photo editing or what have you, but as soon as that’s done and light browsing is all that you’re using the Mac for, the Mac will want to drop into a lower power state, so the CPU will try to save power by dropping into a lower power state. This is when the power rail becomes unstable and isn’t able to supply power to the CPU and the Mac shuts off.
Not local to us? Arrange to post it in and once complete we will post it back to you, fully insured.
To book yours in email us at firstname.lastname@example.org call 01403 263007 or Whatsapp us on 07935 235681