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I am a virgin with this board. This is my first one! It switches to 20v Pulls what appears to be booting current but it's not normal and a little high at the end before it drops to zero and loops. The loop takes 15-20 seconds to complete. I am looking for schematics now. I will be updating this...

I have only worked on maybe 15-20 of these machines and I heard rumors of phantom CPU problems. Not the normal CPU failure were the buck converter driver shorts PP-BUS to the cpu but strange CPU failures. I am just knocking on the door of people out there to see if it is worth my time to invest...

SPI_CLK will only momentarily operate and you can only really see it with a scope. All your rails are good? You have checked for a waterdamged resistor pad? Something like that hiding somewhere?

I have a 820-00165 that starts to boot then I get a crash dump and it starts over. This crash dump is when loading my tech drive so I know it is good. I am thinking memory ic? but how do I tell which one?

Since you are dealing with liquid damage there is probably some pad eaten under a component such as a resistor or a IC. This one will be a hard one due to the intermittent nature of the problem. I recommend removal of the board and crawling over it with a microscope and a probe checking to see...

PP1V05_S0 is present PPDDR_S3_REG_R is present I know that this signal comes from the CPU. What is required for it to be turned it. It should be 1.05v I am not sure where to look from here.

This board is Tricky for me. The flash of 100mA is caused by the brief 1/10 sec turn on of U3900. U3900 is on for just a split second and no thermal signatures out of the normal are detected. PP3V3_S0 is never present during this cycle. 25 Mhz clock is present 3V3 enable flashes but only to...

I picked up a HP bench top multimeter I really like broken one eBay then fixed it. I like the rear mounted banana plugs so I can attach my leads in the back and run them under my bench to reduce clutter. I took network cable and used the twisted pairs to eliminate AC interference and made...

I don't use a ultrasonic cleaner. I use a water pick! I think ultra sonic cleaners are over rated. The water pick really blasts under BGA chips! I use a vinegar / soap solution with a micro fiber glass brush on the bad areas. Let that sit for a while then use a water pick with soap and water...

is this a AFPS issue? have you ran the disk utility? have you tried a test SSD? I have seen several of them fail.

I use google docs. I setup shared spread sheets with my customers and they can check status in real time on repairs. However there is no billing and most of my work is with large vendors not retail.

I started with LBE and a programmer. This does work but I ran into problems. I wanted to share. LBE software uses a hardware monitor that is used to prevent you from taking your copy and installing it on another computer. They have told me that they are changing this wit a new version but right...

I need to figure out how to search this forum. Thanks so much.

You sir are a steely-eyed missile man! I found two 1M ohm resistors that were in the underfill region that had corrosion on them. Dug them out and repealed and replaced and I have 20V! I would of never found them without your guidance! Now I know what to look for! Thank You so much! Here is...

I can't find anything. I am going to dig in the board box and see what I can come up with.

my Just wanted to say I just got a Medusa and you have to have one of these! I really like it!

I found the manual. Google mail threw it into spam. I have been playing with it for a few days now. Thing works good. It's a little touchy about reading the rooms but now that I learned it's quirks it works good. I got the level splitter so I am going to play with some T2 chip serial numbers...

I think I am chasing a rabbit hole here. If I disconnect MagSafe for 2-5 seconds it works perfect. Tried a known good working board had same results. I only recently started booting bare boards all the way into the macOS on the bench and shutting them down.

CPU , PCH. Same U500 mystery box. I have not tried another bios. but I will..