820-3115 A1278 Macbook logic board repair no power

we're live from New York it's Saturday not wait wrong show hey everybody as you know I am Eli the computer wrong show hey everybody how's it going so today we're gonna be working on yet another MacBook let's take a look at this MacBook and see what's wrong with it and see if we can make it work again yeah that sounds about right so first thing I notice here unplug the battery as we always do is that this machine is taking 19-mile amps we have a green light and the charger this is a green light which means that PP 3 4 to underscore g3 how its gonna be present on this board you know just about everything's been unplugged from the board besides speaker display in webcam generally draw much power so the likelihood that this is not a board issue is very low at this point we are going to take the board out of the case so that we can take a look over the board make some measurements and try and see if we can figure out what's wrong with it one thing you may notice is that this machine is an 8 - 0 - 31 15 very very old this board is very very old even older than mr. Paul Daniels hey you can tell that this is old its guts the RAM is separate from the board the drive is separate from the board if you want more storage on this machine than what it comes with you can do that I can't wait for nitrile gloves to return I'm really not a fan of these latex [ __ ] they break so easily I trim my nails like I'm trimming them almost about every day so that they're really really not touching up against the gloves but they do and it rips it's so these are so shitty I hate latex gloves I really do I've missed my nitrile gloves so much I hope people stop buying them up like crazy or at the very least that we actually are able to produce gloves again can we be a country that makes [ __ ] again I want to be able to buy nitrile gloves why do people want to fix an eight year old machine well they like the machine they huh a lot of people want to fix a 40 year old house a lot of people want to buy a 40 year old house you know they you see intrinsic value in it if it still works why not fix it it's what they were thinking and Who am I to tell them otherwise as long as I can fix it for less than what it would cost to buy this machine in working condition on eBay I'm good now if the problem here the problem is that if the machine cost more to fix than what it would cost to purchase the same model again and usually when that is the case I will tell the customer that because it's not telling the customer that is a douchey thing to do yeah you could you could say well they asked me to fix it I did what they asked that's all my responsibility was and something tells me when people like that die they're gonna be going off place a little bit more south of where I am a little bit more south so first thing we do yeah after we have unplugged everything let's see how many apps it takes so we got 20 milliamps that we're taking so the first thing that I'm gonna do on this board same thing that I do on every MacBook is check to see what our main power lines are now remember you need PP 3 before - to be present or to get a green light in the charger so checking for that will be pointless because that power is the SMC and the one wire circuit which is what has to speak to the charger to get you a light that's present we know that it's a little higher than what I would expect but whatever our PP brush g3 Hart is 12 point 5 volts which is what I would expect PP 5 es 5 is our four point ninety seven is a little on the low side but not enough that I'm going to care let's see BP 5e s 3 not present let's see if there's a shorter grounds on PP 5 es 3 for those wondering yes I actually do remember where everything is on this board ok 9 ohms 10 don't come on just give me a number you [ __ ] pizza oh come on give me a number give me a number damn you stop counting stop it I had my problem figured out uh [ __ ] you what's it okay you [ __ ] troll bored okay there's no corrosion hiding in between the heatsink on the board hello Def Con ID let's look through our list of rails in our shall we so PP 5 vs 3 let's try a diode mode measurement I don't trust his poems measuring trolling alright that's not short circuited so PP 5 es 3 is not short circuited let's check other rails on this machine VP 5e soo is are you really not short circuited not at all short circuited ppv RTC g3 hot PP v RT C g3 hot is there pp 5 vs 3 is not there pp 3 V 3 is 5 is gonna be required to get the PCH started kind of curious if that's there you know just curious is all in just curious just curious and it's not we are missing pp 3 V 3 is 5 check on another component just in case he B 3 B 3 X 5 is missing you're not gonna get anything at pp 3 B 3 s 5 is missing so now we need to figure out why a P P 3 P 3 X 5 is missing P V 3 V 3 s 5 is gonna be the basis for my 3.3 volt power line so P P 3 V 3 s 5 is not there and P P 3 V 3 s 5 is important because that's what's kind of power the PCH the PCH is what's up here and PCH is gonna be responsible for all of my signals that do all the things that I need like sending out PM sleep s 5 hours for LS 3 l and so on and so forth douchebag lives matters his deplorable pirate captain gun beard I don't know if mine does I'm not the nicest person okay so P P 3 v 3s 5 n trip this is the rail that's missing over here right computer v3 at 5 n trip this is what's gonna the way this turns on is actually quite interesting show so check this out this is this is interesting rather than sending and enable to the chip the way entropy works is the enable is always on the chip so the chip is naturally gonna turn itself on it only turns itself off if you short its end trip pin to ground which q7 2 to 1 can do if P 3 V 3 s 5 ENL is present P 3 V 3 s 5 en el is going to come from and leave the SMC yeah here we go so SMC PMG to enable when this is in then it's gonna send that out so let's see if SMC PMG to enable is present because you could have a problem with my FM see and if that's the case then I got a board football I don't think I have an SMC - this thing is old thing is old [Music] SMC PMG - and here's three point four okay so now let's figure out what's going on here so SMC PMG to enable is present and when that's president's also get P 3 V 3 s 5 en el are oh I'm not supposed to get that okay so when P 3 V 3 s 5 en el is present I don't get anything this this transistor is going to short the end rip to ground and this won't work so this actually needs to not be present P 3 V 3 s 5 en el needs to be away let's see if that's a way by measuring it over there okay so it's not there remember P 3 V 3 s 5 will be enabled when the signal is low now let's check pin 6 of my TPS 5 1 1 2 5 chip my end trip it's going to be up here that's low that's low that should be three volts bad TPS five one one two five or wait no no no no no no no don't be an idiot Louis your your juice you forgot something there make sure that the voltage is coming into the trip that supposed to so PP VIN s 5v as was anyway pp VIN s5 vs three that that comes in to you 7200 that's required for this trip to work and that's gonna be present on pin 16 so we happy vestry three hot that's a sub ray laughs pbht three hot let's see if that's present no all right so twelve volts is there so I'm gonna take an educated guess the chip is bad and the reason I'm gonna say that the trip is bad is because it is being told to turn on its end trip signal is not being pulled low and in spite of its entropy signal not being pulled low it's not making the rail that I'm supposed to and just for shits and giggles we will make sure that that rail is not shorted to ground because I didn't do that one must keep in mind oh oh no oh oh oh spud go yeah I forgot to check that [ __ ] yeah okay he'd be 33 has five short at the ground so this is the part where I figure out that the PCH is bad and I give it to Chris but let's see if that's what's wrong here I'm gonna take [Music] [Applause] I didn't do that in the right order you know the sad thing is I actually wrote my guide on how to troubleshoot when a power rail is missing and I didn't obey it because I was just about to replace a chip before checking for a short on PP 3 B 3 S 5 because it's not common on the a12 70ft P 3 B 3 s 5 to be shorter but that doesn't matter reality does not care about my assumptions so now we have to figure out why why so let's do that now nice sounds I'm not trying to make nice sounds I'm mad I'm angry I want my boy to be an easy fix is that so much to ask that I'd be able to make money without using my brain I just want life to be easy I think I'm being fairly reasonable here [Music] okay let's just get this over with so that we can see that the PCH is shorted and go home that's what this is gonna be shorted PCH that's what this is gonna be I'm gonna find out after all this that I wasted all this time on a shorted PCH that's the type of boy that I would grab from the new slots [Music] [Music] [Music] I'm not even checking anything else because I'm just assuming if the PCH of the CPU come on burn my finger already let's get this over with let's get the charade over with you think staying as a call-out business is viable in a long term what having a store unpopulated area be better the purpose of getting a store is when you have so many people who want the same time that you start losing customers that's a good question so the way this works at some point you're gonna have so many people calling you that one service at the same time and you're not gonna be able to service them all because you cannot be in two places at once so once you have five people that all want the five thirty times salon and you're at the point where you can say hey can you do five and then you do five thirty and then you do six and then you do seven once you're at the point where that's not doable and you're also not just losing clients but also the constant travel is causing inefficiencies in your business then that's when you get a shop you don't get a shot because you think it's a good idea to get a shop you get a shop because it would actually allow you to work better don't assume that other people are doing things no one assumed that the way other people are doing things is the best way to do it until you've thought it through think it through first okay so something is warm obviously because we're using four amps but what is oh yeah Jesus are we my finger my poor little finger I used to be a finger model not anymore no more finger modeling for me how am I gonna pay my rent oh I have to cancel my only fans account all right so it's fairly obvious at this point why this thing is dead and this cab is actually so hot any of you it is now it's stuck on that firmly yeah there we go and now we're down to take a note pal so I can turn my power supply off that was one boiling hot cap there my friends happy late father's day I am NOT your father Oreo the cat Eric is your father [Applause] all right I need to find a cat that I can put there I'll be right back in just a moment hold on folks don't touch that dial now I'm pretty that you know what I did that was really stupid here but I did that was really stupid here is I didn't follow there was what it says in my own damn guide which is check for a short before bothering to check the Enable I just didn't do that you know you should check to see make sure there's not a short circuit happy Mother's Day if that's how you want to be you have wiped my butt more than Erica yeah that's the kind of grammar that I would expect from Oreo the cat can't even spell th en instead of th a an I'm not your father I would raise a child that could speak and spell properly shame Oreo shame anyway yeah you should check for the short circuit before everything else because it's easier to check for because here's the thing when a big part of this job is how fast can you get everything done so you can get as many of these in and out as possible before your brain does now if you're checking a rail to see if it's present and it's not you can then check to see if this is short without having to look for the enable or the voltage in pin of the chip that creates it in the schematic there's no extra work involved for that besides changing your meter you don't have to go to the board view so by checking for a short circuit before you check to see if the rail is being told to turn on before you check and see if the chip that's creating it has it's enabled present and its voltage in then you save yourself a little bit of time and I remember back to when I was doing all the business board repair by myself no Annelle no Paul no David no Camille Chris and back in those days time really mattered because it was just one person you know we had half the gross revenue that we do now however we also had like one-fifth the amount of bored people yes at one point in time there was no Paul no Annelle no David no Chris no Camille it was all just me and we had I think half the gross revenue that we do now but we had one-fifth as many 1/6 there he could suppose as many people and in that time it really didn't matter that you could be as fast as humanly possible and as efficient as humanly possible because here's one of the things to understand when you're broke you have a lot of time but you don't have money so making the best use of your time is the best way to go from having lots of time and no money to having little time and lots of money or at least you know an acceptable amount because in New York City what counts as lots of money really is doesn't count as a lot of money anywhere else in the world but anyway we're gonna do here is see if this has a fan spin now I'm pretty sure it will bada bing bada boom we're done Quality Assurance testing that's it for today and as always I forgot my line see you in the next video

Channel: Louis Rossmann

Views: 72,737

Keywords: macbook, logic board repair

Id: 72MS4GriOWA

Length: 21min 18sec (1278 seconds)

Published: Sat Jun 27 2020