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replaced u7090 and no change. I tested each point to confirm there were no short on the chip and it was soldered correctly

.......... 18.2v

.......... 7.4 kΩ

..... 18.2v

it is a 820-3437-b

what does it mean if i don't have 3.42 but it doesn't appear to be shorted to ground? it would only let me put in .05 amps

merry xmas duke. I bought a power supply, don't really know how to use it. What would be the best points to inject voltage to?

I also don't have a working power meter, so looks like I am going on a bit of an expedition unless you have a solution? Thanks

I 100% fried the board. Is it salvageable? Where is the best place to learn how to not fry boards or is it just experience?

3v42 reads 0.1v. Testing in continuity mode suguests it is shorted to ground. Is this where I should be focusing my research? EDIT: I am about to remove L7095 and test for a short either side as per Louis instructions here: How does PP3V42_G3H circuit work and does it require PPBUS_G3H to...

3v42 is not present neither is ppbus g3h

So before I took it apart it had chime and green light. Now no chime and no green light :( I took the following measurements from U7090: 1) 0.58 2) 0.1 3) 128.33 4) 127 5)gnd 6) 17.77 7)NC 8) 17.77 Pin 4 was shorting to ground. Replaced U7090, and tested it for shots to ground before powering...

chime and green light. Will test SMC_LID high to morrow and get back to you.

U8300 pins 2&3 are 3.3v; nothing on pins 4 & 5 C8309 is 3.3v C8311 is 0 C8312 is removed I have replaced U8300 and still getting the same results Any ideas what to test next? Thanks in advance

Thanks for the promp reply Duke. 820-3432 is the name of the brd file on the mid 2013 macbook air. I don't know what it is either. So the c8312 chip is not required and I should remove it instead of replacing it?

It appear I need to replace c8312 as I am getting no voltage from it and it looks a bit ugly. However in an attempt to replace it I have misplaced the little bugger on my trash board, how would I go about finding equivalent caps on the trash board I have? Or would I need to buy a new trash board...

Hey Louis I want to (and will continue to) support you, but I have no need to continue with the membership I pay for any more. Perhaps if you try experimenting with having JUST the board repair forum visible and read only for non members and have the other boards hidden. I posted in the health...

holy smoke that is so cool. Congrats on your PR! Thank you very much for taking the time to write an informative response. A little about myself: I play football (soccer) on the weekend and train BJJ 2-3 times a week for the past 18 months. A plant based diet is something that kept popping up...

Through my limited research I understand Fuhrman and Mcdougall seem to be the big schools of thought plant based eating. When I try to research more I find it gets a little fanatical... people start acting like it is 'their team vs everyone else' sort of mentality (this could just be due to poor...

thank you for your reply