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working on a 820-3437 computer works fine hardware test comes up fine but computer will not go to sleep any ideas where to look .

Hello guys i'm working on this touchbar mac which has a strange problem, if i disconnect the battery and boot it up with power adapter i get backlight if i try with battery connected backlight dims out any ideas what this could be. Never came across an issue like this before.

Hey guys i'm kind of stumped on this PM_SLP_S3_L is power cycling any ideas on where i should look next ?

Hey guys i'm working on this non Touchbar Macbook pro boots up works fine but not getting no display power i noticed its missing EDP_PANEL_PWR_EN all pch power rails and cpu are present what am i missing here HELP!!!

Ram beeping has power for 0.75 and 1.3 where should any ideas where i look next

Hey Duke, working on this touchbar mac I'm so freaking confused on where to start PPDCIN_G3H is only pushing out 5 v. Where do i start to look for the issue i checked all power rails resistance to ground and cant find any shorts, I need help to understand how this new system works. Yes its water...

Hey guys this is a general question about finding shorts. This problem happens to me from time to time and i have no clue on what to do. From time to time i will get a board where i find a short to ground, so i then would inject voltage in that circuit, but when voltage is injected the voltage...

Hi guys i managed to get one of these in my store water damaged. Of course upon inspection the water damage was near and around the U7650 which is our same as older models tps chip. Checking around that area i noticed that 5vs5 is missing so i checked for shorts none are present. I checked for...

Hey guys working on a 820-00239 was water damage near the u9300, lets be clear its not an efi lock because i can boot up with an external drive. When i checked disk utility the drive is missing so we can move on. i ultrasonic that area but still no luck the main voltages going to that chip seems...

Hey guys working on this 820-3787, did some troubleshooting and came to the conclusion that i'm not getting 3v3 s0. No short to ground but after checking further i see that it comes from PM_SLP_S3_L, it is 0v not enabling u8180 to open. I have 3v3 s5 on pin 5 as always i get confused with this...

Hey guys had this one for a while, has cpu vcore mouse lights up but there is no chime or display, ram removed there is no ram beep PPVCORE_S0_AXG_R is 0v replaced a bunch of components tried bios tried clock chip tried U7400 even a smc still no luck. Is this a dead cpu. Or i am missing...

Hey guys working on this macbook air, and whats driving me crazy its doing the same exact shit a 820-3115 will do and i have not even yet figured out what causes that shit. So i plug it in fans spins mouse lights up but has no chime or no video display i am going to check some rails and report...

Hey guys working on on this 820-3435 air no water damage, customer used the mac one morning and shut it down came back to use it and it would not turn on. iItried smc reset at first but noting happened, green light did not cycle from green to orange. Tried this twice with no luck that's when i...

Hi Guys this one is pulling my brains on this one. Customer came in stating that this unit has no audio which is very strange because on boot you hear it chime. But when you try and play a video there is no sound, if i plug in the headphones there is sound, but when i unplug the headphones the...

Hey guys working on this 15 in retina which looks like it was sodomized by another shop. I noticed that pbus voltage was 1.6v at charger phase at u7100, I checked my current sense resistors all seem good with normal readings 5v is at input pins of u7100 ac in is at normal 4v at pin 3 dc in is...

Whats up guys just shoot me quick, green light on charger no liquid damage cpu gets warm, no fan spin 5vs0 3v3s0 is present no known shorts to ground let me guess dead graphics chip should i send to the donor gods or does it have a chance for life again?

Hey Guys working on this 15in 820-3662 does not turn on has green light on charger, has a short to ground on ppbus G3h circut So i removed fuses 7040 and 7041 put meter in diode mode short shows up on pin2 going to system. Then i injected voltage and nothing really gets hot but i used a flair...

Customers complaint shuts off before boot. I checked current sense resistors all good. checked and replaced clock chip good, main power rails are present no known shorts to ground no water damage the tantalum cap is the only thing I didn't change yet because it does not have a short to ground...

Hi guys working on an 820-00165 air board, as we all know all rails are present green light on charger. Only rail i'm not sure about is PP5V S4RS3 which has 0v i tested for shorts on s0 rails and all are fine. What else could i check to solve this issue ?

Hey guys I'm working on a 820-4924 no signs of liquid damage unit turns on verified by plugging in a usb thumb stick with led on it. Fan spins when it gets hot, does not chime or display any video. S0 power rails have power, cpu vcore rail also has power. Any ideas on what the problem would be ?