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just curious. what are we trying to figure out? edit added later// I wonder if I somehow made things worse. Now pm_pwrbtn_L is 0 volts. I am also no longer getting any pulsing on pm_slp_s4_L when shorting smc_onoff_L edit added later// now I noticed the green light is off and my ppbus just...

when I trigger smc_onoff_L it does cut the power to pm_pwrbtl_L and it also causes a pulse on pm_slp_s4_L when looking on the oscilloscope. What does this mean? Just trying to understand

Thanks 2informaticos! how would I trigger SMC_onoff_L? So I understand the bigger picture, Is u1950 needed for s4 power state? I thought, maybe incorrectly, it was, but if its main signal outputs are for an s0 state that does not seem to be the case.

I have a board with no obvious signs of water damage. Part of me thinks it may have been cleaned at another shop. I am not getting my s4 rails to come on. Here is what I know I am using a genuine 85 watt charger I have these rails present 8.6 ppbus 3.42 pp3v42 3.3 pp3v3_s5 5.0 pp5v_s5 I have...

thanks for helping me work through this. I am not sure why, but I am now getting pp3v3_s5

How come when I do a search for L7220 in the schematic or brd I am not getting any results? My PPBUS is 8.6v and, I am getting 3.42v on pp3v42. I do get magsafe light I will check those other ones when I get to the shop.

I have a board I was working on and noticed what seems to be the first issue. I have no voltages on pp3v3_s5. My strategy was to look in the schematics and search for a chip it was the output on. I have gone through the schematics many times and must be missing it. The closest chip I found was...

I am trying to get a handle on which donor boards to stock. For example other than SMCs I am guessing I could stock just one model of macbook air boards to cover 2013 to 2017. What strategy do you guys use to cover your bases?

thanks John!

As said above, the way they must fix things would be by removing shorts that the corrosion may have caused.

As a general rule we have done well by pricing based on what we need to make money and not by what others charge. With that said it would help to know what apple charges for different repairs so we can price accordingly or use their prices as a comparison when speaking to clients. To start...

were the removed posts in regards to using iso?

We do not use hot air, just slowly work something flat under the glue a little at a time

it needs the touchpad connected for the keyboard to work other than the power

We are just learning and even if MacBooks become unprofitable(that will be few years off), the skills learned will carry over to other devices.

Thanks for that great explanation

That is what we did. We saw some rossman videos and got excited, then ordered a bunch of equipment to learn. After a year we are getting the hang of it

I have been reading posts and people discuss using SMC bypass mode. What does it do? Will a computer turn on and display with a bad or missing SMC if you use this mode to start the computer?

it is a great guide and big help understanding, starting at the basics!

If I did my math right, I need just under 4 ounces per gallon to get it at 3%.