Each work must be paid nothing is for free maybe only the air that we breathe, therefore do not expect my work or of someone else to be for free, respect and appreciate other peoples work because that is in proper order.
No keyboard Trackpad MBP 820-2915-b
This IC U6990 output PP3V42_G3H test for short the missing or low voltage lines but also test resistors on that page.
I found board layout and updated in a folder check Macbook Schematics google drive folder again.
Do not wait that i feed you with the tea spoon, the site is full of info have patience searching and reading because this is the great way to learn from others.