Macbook Air no backlight: they thought the screen was bad

yeah i drew the short straw actually uh we were going to be drawing uh 18 650 batteries out of his uh bike battery and whichever one explodes on you they're they're the ones that have to come here and do a video so what i got here i got a i got no parts that's an issue i know these need parts uh well i'll solve that when we get to it hi this desk is really tall this chair is really short i feel like a little kid here okay um what do we got we got we got some board repairs uh got a macbook air uh macbook air that came in with uh no backlight and uh first red flag is this here what i have overhead i've overhead that's overhead somebody ripped off the uh coating off of the bar and replaced with some captain tape and this is some kind of um some kind of warranty mark from some other i don't know i don't know if they replace the whole screen or that's a warranty some from some other shop but yeah screws in the wrong place screen changed and no backlight so let's delve into this and see what's going on so first things first i see some uh picking at the fuse so i think somebody broke something and didn't want to admit it uh let's check that fuse now that's the backlight fuse and we have open line so i need a fuse we know that but let's just inspect things before we go into that farther so yeah i see some scratching around here somebody didn't know how to take out a lvds connector whenever anybody works on their computer comes from another shop or anything always look for things that have been knocked off people don't realize that these boards are kind of delicate they're not delicate when they're inside the machine although apples themselves are pretty delicate but when you get it outside of the machine and you're touching these things these little little uh resistors and stuff they can be knocked off by somebody's nail pretty easily so let's take a look through the more sensitive areas especially around here see these little little diodes that are just hanging out in the breeze there they come off so easy if you just nick this on the edge of a desk or something so that's always a good idea just look around make sure everything looks okay see a little bit of corrosion right there we could hit that with a q-tip after looking at boards for years you get used to what components are supposed to look like and what corrosion looks like like some people would say oh look there's corrosion right there now that's just fuzz oh look some some corrosion underneath the backlight driver oh corrosion under the backlight driver new screen still don't have backlight hmm so either the customer or another shop had a computer with no backlight and they just put a new screen in and then they were upset that it didn't fix i bet you that's the story seen it more times than one so let me run over to my desk and i'll get parts for this i need a lp 8550 and i need a backlight fuse which i will uh go get from store.rostmancoop.com and i'll be right back store.rostmangroup.com for all your electronic needs i'm back from store.rostmangroup.com got my store.rosmangroup.com right here these are my parts from my desk this is stuff that i change on a daily basis i always keep spares with me so there we got some lp 8550s i'll leave one of them and i'm out of fuses i have no more fuses so now i actually have to go to the realstore.rostmangroup.com and get some fuses one moment please i'm back from storage.rosmangroup.com with my backlight fuse so yeah i'm terrible at reading chat so uh every once in a while i will look over there i never understood how lewis can actually sit here and read chat and work all the same time never can do it tweezers flux flux who's got the flux who's got a needle for flux no needle on the flux so i had to use a lewis amount of flux because i don't have a needle for the flux 12 gauge wire will work fine for the fuse i should we have 12 gauge wire around here i should put a piece of 12 gauge wire next to the fuse just to show how comical that comment is i got way more flux than we need just preheat the board around the area a little bit and we'll get in there right on that lp 8550 hot air station is on full and full as always i'll take some fresh solder oh god this tip isn't gross much better some fresh solder onto there and i have no fume extraction now i have fume extraction okay wick wick who's got the wick that donation sounds scared me do the minions deserve dead fishes today uh yeah probably it's been a productive day christopher kelly that's you that sends the uh sushi that's some good stuff oh i i keep meaning to look at what restaurant that is because that's some really good sushi q-tips q-tips who's got the q-tips can't find anything on the station i would love to just transport all of this audio video gear over to my station because i know where things are there's q-tips oh they're the pointy ones ooh fancy q-tips okay pads are cleaned nothing looks messed up this this one right here this is the feedback this is where um backlight is coming back into the chip so that it can see what it's actually producing this one gets destroyed quite often it doesn't even have to have liquid sometimes just moisture in the air can destroy this one just because of its proximity to other other voltages and ground and the voltage that's on it and then these two up here take a hit when from liquid damage all the time this is the incoming voltage now let me go get a syringe for or a needle for lewis's syringe because that's just ridiculous your opinions on commenting on the path trains i don't take path i take new jersey transit and uh most of time is pretty good sometimes it sucks i don't think they did enough to protect the ridership from kovid their official stance was that 50 of the trains they will um occupy to 50 capacity which means they have a 10 car train they only allow five cars open so how is that 50 so you're only giving us 50 space for the same amount of people that would be there anyway okay that doesn't make sense okay now i have a nice clean flux with a real syringe needle on it now one pawl of flux and we'll put that right there try to align it then we take our tweezers push down a little bit kind of scrub it around it'll stay just on its pads if you get it right that's good i'll keep a little bit of pressure on it while i start heating and melt it into place slid into place make it dance a little bit there you go clean up as we go so now we can deal with the fuse yes i said the dead fish's place is called bondi sushi it's at the corner of fifth and 28th ooh cool hi from texas yeah you're cold down there aren't you that's crazy what's going on in texas is it all over with yet how is texas i never follow the news i only get news second hand somebody posts something or something like that it's the only time i see news so let's add a little bit of fresh solder it'll make the fuse come off easier so now with a little bit of leaded solder into this lid free that'll be the first thing to melt so that'll come off before anything else even gets hot enough to melt i want to angle my air away from the this is the wi-fi card and the connector there it's all plastic on the inside you got to keep your air angled away from that i was 70 today all right we got a bit of a heat wave that came in too it was like 43 today i think it was it's better than it has been but i don't even think all winter we had uh weather like what texas just had you guys were down like the teens and stuff for a while we didn't have much of that at all all winter long and we're damn close enough to the frozen north we've got a new fuse it's one of the only fuses in macbook that actually does its job let me see if i got a 12 gauge wire i know lewis has wire lying around here here you go let's let's change it let's just uh run a wire over the fuse so we'll just put this this wire or the yeah and that wire could go right over the fuse right i'll just solder that side of the wire right over the fuse instead yeah no now what i'm worried about with this next is that it has this change screen in it so i don't know if the screen was what caused this issue so let me plug the screen into it and then we'll check and see if the screen is still shorting it or anything like that every time erica is yelling oh my gosh for the donation sound it kind of startles me it's funny we have loved teens you're actually negative six negative 14 jesus christ yeah we didn't have anywhere near that in new jersey or new york maybe upstate new york maybe like the lakes area or something like that the first year in a while we've had a lot of snow and regrettably i haven't been out skiing yet okay i don't need anything to test backlight except that i'll put this anyway yeah just testing backlight i don't need uh i don't know why they broke that brand new screen we broke this yeah the bar just came off and fixed okay let's see if we have uh a short backlight output just don't want to lose it and the backlight output yeah that's just charging capacitors that is not shorted ah what's it like working for lewis this honestly is probably my second best job i've ever had my favorite job i ever had i was working for lucent technologies as a communications technician that was a really good job that was some fun times that was good work i was a one of those old-fashioned companies that you know had a union and benefits and all that stuff going on you don't find that anymore even for even if you do get hired by one of those old companies like at t you don't get the benefits this charger is atrocious the pins aren't even coming out i don't even know where this charger goes this power supply the power supply is not on power supply is on i don't know this power supply the power supply is controlled by that isn't it no pushing output does not do anything on this power supply it's probably because it's connected to the computer is there a computer power supply and we have green light and we have fan spin oh question mark folder there we go somebody probably did screw something up either that or that lp 8550 that i saw a little bit of corrosion on screwed up the hole works at the beginning and they just changed the screen thinking that was the problem that one's done

Channel: Louis Rossmann

Views: 40,330

Rating: 4.9222221 out of 5

Keywords: macbook, logic board repair

Id: 80DCi8qLLzU

Length: 19min 19sec (1159 seconds)

Published: Wed Mar 03 2021