Join Date: Aug 2016
Location: In a circus tent
[eevblog] Apple's MacBook Design FAIL – Who's To Blame?
Dave Jones--who runs eevblog
--digs deeper into the examination/review Louis Rossmann did last December of problems with the engineering design associated with the latest MacBook Pros available at that time:
made by Youtube user Rainiedays to Rossman's video actually sums up the root cause(s) fairly well:
...as a former hw engineer of a large company, it's easy to see where this error arose. No single designer is responsible for the design from start to finish in a large corporation. The error started with the CAD librarian (responsible for drawing schematic symbols for new parts and maintaining them in a "library") who incorrectly labeled pins 1 and 43 to be far apart numerically when physically they are close together with the mindset that the physically larger rail (voltage and ground) pins (43 and 44) should be grouped together with the other rail pins (45+), without highlighting that pins 43 and 44 are actually physically super close to pins 1 and 2. The board/circuit designer (person responsible for designing the schematic) then imported the connector into the schematic and performed pin assignment with the assumption that pins 1 and 43 are far apart because they're numerically far apart (a completely different mindset than what the librarian had). When this is passed onto the layout engineer (person responsible for actually routing the design on a physical board), he routes the design blindly and does not catch the error because he does not know or really care about how the circuit functions. When the board goes thru testing, nothing is ever caught since nobody has the foresight to purposely try to short a design during testing. Ultimately this is a flaw due to a misunderstanding/mismanagement between multiple engineers with different functions. This would never happen in a smaller company where the design is owned by one person from start to fab, so Apple being rich and large actually works against them because all of the engineers that work on a board need to have the same exact design philosophy or at least adhere to the same standard. This flaw is still, of course, unacceptable and can be remedied with better communication or a set internal design philosophy standard.
...playin' the lead roll in a dwerg
Last edited by iamjanco; 06-20-2019 at 04:19 PM.