Macbook Pro A1278 - no power (greenlight only)

everyone pull Daniels here what I fix daily welcome back okay we got a 8:12 78 let's come in it's not powering up it was sort of intermittently powering up and now it's completely stopped powering up so yeah we've got a pretty normal sort of activity on the board that you get from any of the machines that are this old and this sort of kept in isolation chambers it's a battery's off think we'll probably check around the bottom edge here that's a fairly typical area so as we should try to make safe on it just to confirm what we're thinking you get the original Mac safe one hopefully we can have a win here person would like to get their machine up and running and their good old a 1278 so okay so we got a green light so here we go four pair up and pressing the on/off button does not entail any activity so we must have 3G 42 probably SMC but we're not getting any activity all right so this isn't gonna be a bit simple it's gonna require a little bit thinking nope 29:36 all right look around the board there's our toothbrush all right so we can already see we've got fairly traditional bottom edge issues I'm so corrosion down here that's those three parts there could be a problem a car we got a nice chunk of corrosion there now I think at this point our best course of action will be well clear up these bottom parts and then take the board out because most likely when these guys are all upset then on the other side there's often something that's corroded as well a bit of dust build-up there a little dust bunnies they would have kept a little bit warm that's okay that's very normal at least on MacBooks it's a lot easier to get to him I'm not a great majority of PC laptops I did a PC laptop the other day that always needed me to take the screen off just to get to the fan it was a joke it wasn't quite that bad but certain it wasn't power off and make sure you do this smoothly you don't want to get puncher in those flexes there we go I do get a few machines in here at times where someone's used a pair of tweezers to get them off but they poke em like this and they're trying to get them out rather than a even distribution on the flicks and it punches through the flakes resulting in intermittent issues afterwards particular if it's something like a keyboard flex coming straight off the keyboard you really don't want to be replacing the keyboard these ones can get a little bit tricky to get out and of course you've got to be careful if the camera camera is a very easy one for it to get damaged it was very tempting to pull the cable and once you've released it a bit you can grab the cable small amount of tension and wiggle it there we go it's good to get a good feel of what it should take to get a board out rather than forcing it okay we do have to get the microphone out still make sure I might just take the butt take the battery out as usual with almost all of these the trying drive hold is already broken I'm using an iPhone 7 trying driving here that's a bit of an under kill come on there we go focus back on this man look so we go get the microphone out this is hard I hate the most there's worry I'm gonna do damage here we got that one out good all right we got the bullet out let's give it a bit of a brush down before we start looking at it just get the dust bunnies off and yep this is why it's good to take the board off if you've got damage in that area you can see well this here like corrosion so that's gonna need cleaning up clock circuit it's slightly tainted it shouldn't be too bad but again always good to clean it up well what we'll do is we'll flux um well this area and then we'll work on the outside the SMC side there's a bit junk up in here too you probably will get handled once you go through the ultrasonic get some fizzing going on there that's what you want to see when you know your flux is doing its job chewing away of the corrosion this RTC clock circuit it's actually redundant I think you know this clock circuit area needs to be kept pretty clean too on the MacBook Airs it's a notoriously bad area for giving your shoes and I do get a number of them with a foul on this 3v3 loan it's off of the SMC area I say this big cap here was pretty beaten have a look at what that is first of the two no you the just up Thunderbolt I'm pretty sure now main concerns originally with these three pants down here a lot of this stuff can take a fair bit of corrosion but there is certainly a threshold whereby after which they can probably cause like this here so that how it's going that parade right down on the pad as well now there could be corrosion under the SMC so you may have to reflow that so you know if I had to pick something that there would be a bit of trouble in this one I'm toast second and your third though you look like you actually look like you've cleaned up but this cap here you'll see what that is how do you SMC VCO not exactly sure what VCL is this resistor here woody you're a pulldown and SMC md1 that's a mode selector and you should be 10k I'm just gonna test that let's see what value we get we at nine point nine so that's acceptable it may be an SMC issue yet so hopefully it's not that I'm enough work to forgot to check my voltage on that see if we're running at 12:56 or come back to life No they show that caps are Ghana so we'll get that replaced had seemed okay but then that could have been from me working on just fluff him up fluffy pads well that cap did get knocked off pretty easy I'm not so sure it would have been really the main problem because that's a fairly generic habits mind you it is actually sorry it is a dedicated on its own so yeah change my mind on that I'll take that back get ourselves a doughnut we 936 which interestingly is also missing that cap okay fantastic the camp for that is a 0.47 microfarad 6.3 volts and it's a 402 sighs now confirming you on the boards at the moment but I do have some new replacements there's these 16 volt rated and Ryan you need 6.3 but that's okay the fun thing there was that on the packaging it's listed as 417 nanofarad which is 0.47 microfarad but just what the difference is sort of units multiplier so in a rush running around looking for these things you get a bit blind sometimes and you go I don't have any point for sevens and then you realize it's staring right it right at you all right let's get this one down marbles let's try put a fan and make soap on and see if we can get us a fan spin the power for the power good my pants pin alrighty so we'll check 3d 42 and we'll check oh we know but through you 42 G 3 hot is what I was meaning 12 minus 6 so we do have s MC so that is MC oh no fellas 3.4 oh they're good see what our team sleepless for Ellis you know we didn't have this four oh yeah that's bad news does it think that's a sweet we've got SMC lived which means it is all good as much as I wanted to avoid this stage probably wouldn't hurt to pull that SMC given the degree of corrosion that was down here I guess it was an inevitable outcome no okay that's your SMC removal so we'll give it a go oh goodness that was a nice clean SMC Pat's it let's get rebuild the SMC right this thing we do is put some lettered solder down so that it's a bit easier all up now this all comes off but it just makes it easiest makes it easy to clean up the old pants so don't get any dry spots or anything about that it's pretty good now we how do you wick off the old stuff and this leaves us with a nice clean starting surface for every boy OOP seven out of control already then you go all right something good I think I've been doing the SMC is like this isn't really gonna take them out of little holder here and wash down that holder otherwise it will boil up and out and cause issues doesn't have to be perfect but it just has to get rid of the bulk of the junk is already enough actually resting on the other side of the chip it looks like I missed three there but I think we can you know whether you still see those on that and the trouble with the having the flux there is when it heats up it pushes up and that's when your balls float off several get a stencil few strays in there knock them out cuz I never get knocked out you gotta brush them out it's good let's get our paste now this time I can do a reasonable dry place mix looks fairly crumbly and like clay so it's good stop it's not running everywhere so that's good do you have to sort of smoosh it into the holes you can't just swipe it over the holes the stencil is moving around but that's okay because of the pace that's already in the holes it's sort of it takes the SMC with it so we're not actually smearing the paste across holes negative rotate this around don't worry it's not a big problem if there's a bit of smearing here in terms on the surface it looks pretty good all right now commence our slow roast now what's happening here is we're heating up everything around like the actual plastic fiber board holder itself the stencil the chip you're trying to want to keep it barely even if you hit it aggressively you'll buckle the the stencil and if you buckle the stencil then the little micro balls that make up the paste will tend to flow out before everything's ready it'll actually weep underneath between the stencil and the chip so you really don't want that yeah that bottom bottom left ball there is probably going to be a wee shy on size was er goes if it needs to be bumped up a little bit we can do that later everything else looks pretty good so it's not worth ruining everything else for that one ball we should be getting to the point soon where it's about ready to roll notice that the pace is staying in the holes pretty good it's not bubbling out or anything there's a hole up side of the hole dry paste method okay now is standing but it's only happening just as the balls are ready to form the pop out to normal because there's no pads under there spend a few milliseconds that gives a chance for everything to sit down and get a grip all right look good yeah I should be cool enough now the Bulls little son of it I'm gonna see if we push it out okay sometimes reusable yeah if they didn't probably bind ed we get it never did good that one's fixed give it a bit more and replay them all now by flexing and reflowing at this stage what we're doing is it just helps pick up any little drinks like you can see down here that's actually a bit of a big tree little bits of sortable solder paste that didn't manage to reflow in the process we've been go a bit harder on this and they should just gloss over like that hold on some thing is we do know listen we didn't even know if it's actually gonna fix anything for we know the SMC is good and we're just doing it for nothing no that's cool enough now I try not to hit with the alcohol while it's still boiling hot like I don't want the alcohol fizzing completely off there's a bit too much shock for the poor chip sometimes happens but it's nice to avoid it if you can a little bit of flux not too much because everything is quite fresh and clean we didn't need quite as much flux to cut through any sort of oxidation because I've already got ourselves a very clean setup oops now some people like to push down and wiggle a petal at the flats cool off a little bit and then lift up the edge and have a look that's pretty much perfect now I've got a bad habit of chickening out with reflowing these let's start to your perception of time when you're doing something that needs to be stopped at a particular time it can be a bit funny and you start counting one second as two seconds and you think I've been on it for too long and you're worried about cooking things and you never quite get to the reflow jump point where you get misled and you think you see a jump but it actually hasn't so that's what we're really looking for and then it should dance around yeah just notice that caps got a bit of a chip out of it I don't think it's a problem but it's just interesting that I noticed it green light boo my fans spin hey let's check our TCG three huh someone there three point three be sure it's that one yeah three point three very good see we get our clock out one of the ones we can measure on here and we are getting 32 kilohertz so the clock is up and running we'll stick this in the ultrasonic and see here we go all right next step of the process we're gonna go through and do some diet made chicks I want to see if the BIOS SPI boss is all good just yeah generally run around see if I can find anything that might be glaringly out of place good thing is I actually have a proper full test comparison board we fix this one up the other night and it's also a tween 936 so it's very handy having comparison boards okay so this is the reference this is the unknown multimeter is out of range there we go good enough I hope so if you pick the diode mode 5 4 6 3 5 5 open before yeah sorry yeah it's close enough okay already a big one for six wheels this one was open was it nope it just wasn't reading yeah that's ground six three eight five two six six three five two six okay over all the values oh oh yeah okay so they're not too far off we think that I would consider of torrents level well what was my boss Justin after PB bus s 5 HS computing on top of this great big non-existent pad top one five eight okay that's good if he vows if you versus 5hs other current cents which yeah talk about nine whatever yeah see people DC in three three heart we got 3G 42 G through help we got TP v RT C g3 hot fairly sure we've got this one but doesn't hurt to check and that's somewhere around here okay we seem to be a little bit unstable there get there can't keep my I don't want to short things either yeah okay well that's unstable so that's we've got a hint what's going on so why would our TCG three hot be oscillating like that now I'm just gonna get back to a previous round like let's see three forty two and see if that's oscillating me off this one here we should be able to pick up 342 it seems pretty Rocksteady alright so I've got a problem with the RTC okay got a bit of a hint I'll just just connect that it's measuring died move on that line usually you've got something oscillating like that it can often mean that there's a short further up okay dad yep okay so we got point four four just making sure that that is that full full right no it's checking our reference board which has a very nice clean-looking g3 hot area kart ec145 yeah so that's okay so we'll see what powers what's been powered by the RTC g3 hot so tour parts on that line now the line itself is okay so it's probably gonna be a chip or something I guess the question is is it generating it poorly or is it being pulled down okay what's your 2,800 2,800 is the RTC chip your 1800 is the big one no TC reset so there could be a fault perhaps of the RTC chip maybe don't have to be pulling it down that habit yeah we'll keep looking what else well potential culprits are 2810 c28 team here if there's a problem there then it could be unstable power or it could be you 2800 itself not really sure exactly at this point it's a look at that cap well the cap actually looks pretty good not that that means anything and look so we do yeah tough call we are getting clock output on that let's check out all the rails feeding into that chip just in case maybe I miss something I've got no problem changing the chip that would be nice not to have to particularly if we don't have to okay they seem so we should see 3d 42 on pin 13 which is this one up here and then we should say 3v3 I'm kidding to you something here I just kind of see it up here 3 3 V 3 and group start shooting that up keep skipping and definitely not stuff in there and it's all over the place yeah there's not stable at all 3v3 s5 oh how I missed that one of my rattles checking so I'm probably going to be more inclined to blame 3 B 3 is 5 then I am the RTC at this point he died mode and a 1/3 that's actually probably feeling a little low I was short he could be wrong but it does feel shorty yeah should be 144 whereas some years most definitely not 144 let's try it again just a verifier and there we get it's up to 140 oh right yeah right he generates 3 B 3 is 5 3 vs 5 is you generate that TPS 5 1 1 to 5 which is you 7200 that's this fellow here really suspicious there it's not really in the area that was damaged rather this is gonna be fun and a lot of things run off at 3 V 3 is 5 all right if it's pulsing all over the place now this is where probably would have helped if I have a MagSafe with the power supply connected I could actually see if we have an excessive current drain or not but since we don't have that what I'm gonna do is run it put some alcohol on here and see if we notice any Polson the power supply would have been a much better way of doing this no work with what we've got what we're looking for is a pulsating heat source usually shows up with alcohol as a level of turbulence that won't settle down and I had to find all the places that 3v3 is five show up and believe me that's a lot of places I'll show you what I mean save all of these our potential candidates and that's what's on that side now given that our damage was mostly around this portion of the board maybe we should start looking around here and the bias there could actually be a culprit too every camera might have been helpful about now okay I did get messed up a little bit so it's possible and we do have a couple of 3 vs fives here you don't fit by you bang on to waive certain oh listen you're taking a dive there mmm something's very certain we've got a heartbeat audio circuit now you can see that but I certainly did and see it they say the heartbeat and that big cap in the middle let's get some effect Halloween special enough fun of that this is not that uncommon let's see switch over to what that cap is I'm sorry bring it up alright so that's it's on someone there's a make sure the right yep that's that one there 62 13 10 microfarad 6 volt 3 that's a pretty big one 603 sighs so it's sitting on 5 3 s 3 so if that's should've out that will certainly bring down everything stop it I'm coming up properly so we give your dad tests then we got a dead shot yeah best if I switch over [Music] dad test yeah did short now you compare to something else like this so there we go so say if we replace that we should be good to go that said I think everything else that we've done also it was probably needed even if it was at a preventative level now we know it's this cap well should beat this cap because that's where the heats been generated I mean if you measured the diet made anywhere else on that line you would have also got a short that you wouldn't have known which part on that line was a short but because this died of this capacitor was beating that was the indication that we had a fault let's have a look a bit faster and see if we can see any indications of it has failed sometimes I have a crack in them yeah very uh you can see there and that was on the underside punch through looks like a minion that's had a bad day I'm curious well sometimes work and sometimes didn't certain didn't work well allows or maybe it's just a case of sometimes the things are the SMC reset of the stability detector sort of said no not good enough for not coming up 10 microfarad 603 6.3 pretty sure we got those as a general rule Tim microwave 25 volt that's a little bit over the top not quite so keen on using that because when you increase the voltage capability at the cap you are sacrificing sorry just looking at other things in the moment there when you do that you're sacrificing things like the I mean I am NOT well there's no various accessories no you're 1206 oh wow all right looks like a matter of making order for few of those disinclined to go at the 25 volt because the ESR rating on that probably fairly low compared to what I want so what we can do is we're gonna go find one of these parts okay so find a part 10 microfarad 603 and I think a lose six point three volts search now we'll get a fair number of them it is a comparatively common part but just doing it this way makes it easier for me to find it in a hurry rather than going through the schematic and digging around I've got another I've got three one one five another between 936 which I should check to see if they even had the part who knows maybe I haven't used sort of warm up now look at that that one still got one maybe curious to see you this is the 29:36 looks like we got a whole bunch room so c16 funny big bunch of em they see one six one three one six one yeah well we got plenty of space on any given board we're gonna take this one since it's right here right now that is the upside of having plenty of Downers on hand you don't have to search for anything you can just grab exactly what you need from the same place without having to know anything about it I should check to see that this part actually she'll also check to see that the network is no longer a short I mean I'm fairly sure that would be the case but okay you're good I've no idea how mom wanted me to get down on the ground on that slightly distressing you know and it seems my multimeter software is in the mood to crash tonight the software itself is not crashing it's the Bluetooth interface that's not you know so there we go one point one so we're definitely no longer a short the smells certainly took a bit longer than I expected oops what is going on there oh that that's order will not that was refusing to go down on to that pad that is weird let's try that again the problem there is just the different alloys of the solder and the one on the capacitive really just didn't feel like waiting to the leaded solder I mean you normally expect it to a degree but you can't expect it to be that strong let's see on the other side of it's particularly reluctant that's why you're having the new paths that's quite nice now let's double check make sure we didn't have that short back just in case that part we put on there was a dud point three eight eight three nine let's compare that to a known working board with the nice fresh looking layout 440 it's not super close but it's probably fine okay let's go for a fan spin hopefully come on team spin should we grab the right one yeah oh there we go pain spin great we'll stick it back into the chassis just to make sure because there's probably other issues if I'm not careful so I'll be good to know for sure that it's running a piece of paper so we didn't scratch up the case I mean these may be old machines but there's still no reason not to treat them appropriately also views the tan of a pain to get back in you almost always have one cable somewhere like that one that gets smeared our speakers have been getting bombed turn off our fume extractor so we can hear ourselves think okay you connected see I need Wi-Fi I don't know Jewish Apple had made these keyboard and trackpad connect us a little less frustrating to get back in not good no see we're not expecting anything more than it initial folder icon okay things spinning up the screen is not energized what else is wrong I swear all I have I didn't but I swear I saw smoke coming up then we have got here the eight twelve seventy eight twenty nine thirty six board that we had the beating heart capacitor on now we cleared that up you still couldn't get a beat properly was driving me mad I walked away from it and then I ran about one thirty two o'clock in the morning I went out up again and I was measuring everything running all over the board and I just couldn't make sense of it and then I realized I've picked up the wrong DC n board so that's twice in a week that I've been trolled by a DC n board since I put there I went on it builded it was fine so in the end it really was that beating heart capacitor was the last step that we had to do now I don't know if the smc genuinely was faulty or not resumed in terms of its bold connections but I am glad that we cleaned it up picked up a couple of those traces down the bottom there with the veers so now I can put this machine back into use and feel confident about its longevity so that's pretty much it now we'll put it back together and we'll confirm that it boots green light chime screen alright and we do have a boot C activity up there it's a real good so you go another heartbeat capacitor I was a little tricky to find probably didn't help that I was half asleep but we're all good and running again so this machine should last for another few years probably change over to a solid-state drive or something in the future and in the last even longer alright thanks for watching see you guys next time [Music] [Music] [Music] you

Channel: Paul Daniels

Views: 84,657

Rating: 4.7650352 out of 5

Keywords: 820-2936 no fan spin, what I fix daily, macbook microelectronics repair

Id: KU8qgcfSjR4

Length: 57min 20sec (3440 seconds)

Published: Wed Oct 24 2018