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I am working through a missing pm_slp_s4_L on an 820-3476. The board appears clean. here are the following readings PPVRTC_G3H : 3.3v PM_SYSRST_L :1.9v LOW? PM_PCH_PWROK: MISSING PM_RSMRST_L: 3.3v PM_PWRBTN_L: 3.3v SMC_ADAPTER_EN: 3.3v PM_BATLOW_L: 3.3v One of the issues seems to be...

I think I had a bad charger that killed several boards the same way. I first found a short in isl6259 on chgr_acin, which was cleared after changing the ISL. The short is gone, but I am still not getting any ppbus. I have a resistance of about 20ohms between pin 27 and 28. I have about 4ohms...

I have an 820-2530 which is not turning on. I have 0.19 volts on ppbus with no short. The adapter light turns green and never changes to orange, does that indicate anything in particular? My only thought is isl6958, but I am not sure what enables I should be checking first

I have a missing backlight and 0v on bkl_pwm. I am able to get the backlight to come on if I jump pp3v3_s0 to bkl_pwm. Any ideas to why bkl_pwm is 0v? I get 30 volts on the main backlight line without the jumper

I have been reading and not finding a good answer. Is pin 8 of u5110 an output to the smc or in input from it?

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...

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?

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...

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?

I have a new Crest UC just ordered at the Rossman Store coming around Christmas time. I have read the basics of using it. Am I correct to assume I need to remove the heatsink? If so how do I go about doing it?

I can see the value in using an ultrasonic cleaner to clean boards, but how do they work to fix issues? If the cleaner is just removing stuff, which would probably even include a small amount of conductive metal, how does that repair anything? I have never heard Rossman say in a video that he...