Re: Macbook Air 820-00165 board power pulsing twice and missing PM_SLP_S4_L
Yeah that's what I was afraid of, I removed other chips on that line (U7600 and Q7630) earlier hoping that the resistance would come up but no luck. Thanks for the help, at least I may get a donor board out of it if the guy wants to replace the logic board....
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Re: Macbook Air 820-00165 board power pulsing twice and missing PM_SLP_S4_L
I have gone back and measured PM_SYSRST_L resistance to ground and it is 17.76 K Ohms, black probe on ground.
The Vcore to the CPU is double pulsing, and also PM_SLP_S4_L is double pulsing.
I also checked L7630 as I saw that being mentioned in the other thread, and it only has 7 Ohms to ground (on my boardview these are labeled PP1V05SS0_LL and PP1V05_S0_REG_R). I assume this is the issue?...
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Macbook Air 820-00165 board power pulsing twice and missing PM_SLP_S4_L
I have a 820-00165 board that is power pulsing twice going from drawing 34mA up to ~350mA then back down to 34. No fan spin. It is missing the PM_SLP_S4_L signal. As I have no previous experience with this particular problem, I've been measuring a lot and have already replaced U1900 and U1950. I've also replaced R5513 near the SMC that looked corroded. The behavior of the power pulsing twice has not changed.
I've watched some of Louis' youtube videos on the issue and have checked the SPI resistors for continuity and they are good, probe points are also excellent, no signs of corrosion....
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Re: New Members - please post your introductions here
Hello, I'm Ryan, 36 year old repair tech from Texas that focuses mostly on laptops, PCs and more recently MacBooks. Started to get interested in board repair around 2019 when I found Rossman's channel and have done a number of board repairs myself since then. I appreciate this forum for giving me access to almost all of the MacBook schematics and boardviews. Thanks.
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