Understanding power rail sequence saves time in electronics troubleshooting.

[@Shiznoz222]

This was the video that made everything just click in to place. Feeling like Neo from the matrix right now, for the first time I'm like... I AM GOING TO BE ABLE TO DO THIS.

[@rossmanngroup]

That's the best feeling in the world. GO DO IT!!

[@rikvdmark]

Shiznoz222 Jup, I like these subject specific videos :)

[@DannStarr]

This video is literally laden with gold

[@abdielo35]

Exact same feeling here, I finally feel like... OOOOOOH so that's how it works. 😂 P.D.: This guy should drink more often while making videos I really appreciate the explanation.

[@millergael7665]

I know im asking the wrong place but does anybody know a way to get back into an Instagram account?? I was dumb forgot the login password. I love any tricks you can give me!

[@TheKumra]

Just remember to always use a fume extractor, to insert your tip all the way in and to drink lots of jagermeister.

[@ccc822007]

That's what she said....lol

[@tonytrilex2555]

I think this one of my favorite videos he is so positive here I wish I saw more of him being positive about life like here in this video

[@scotshabalam2432]

I was soldering the other day and I just butchered it. It's funny to come see one of Louis' videos and notice the 12 things I did wrong just by watching him do it right.

[@tylertuthill5121]

This video was done so professionally and direct. Thank you.

[@Ilegator]

Wow this is one those videos where everything starts to click. Thank you so much. ❤

[@rossmanngroup]

Thank you. I'm so glad this helped you.

[@Dyaxxis]

19:40 If I may add, many pre-heaters can also be serious energy hogs (especially convection types). The flatter ones (almost always IR) are usually very expensive. My organization requires them for almost every type of rework, because the equipment being serviced are very expensive mission-critical boards (priced from five to six-figures) and their PCB's are loaded with significant voltage, ground, and thermal planes. With that mentioned, I do think they have their place, however like you mentioned, I certainly agree that if one can successfully complete the job with less equipment, the better it will be. Just my .02.

[@pr0xZen]

Thank you Louis, this helped a lot. Like so many others I've started to get the mechanical skill of microsoldering to an early stage of "almost a bit under control", but still mostly lost if there's aren't visual indicators of a damaged/failed component.

[@ilducedimas]

Bless you for making this video. Thank you so much.

[@EliasJUANJuan]

I subscribed a while ago cause of imgur expecting different content but this is much better and interesting than what i expected

[@DoYouLikeMyNameDude]

Always remember to insert your tip all the way in. *proceeds to take a long swig of Jaegermeister*

[@m.m.m.c.a.k.e]

Hey bro thank you for this video!! This is a friendly reminder to change the batteries in your multimeder lol. Always drink professionally . Protip from our good friend Louis.

[@PieroUlloa]

I learned today that the ACPI Specification (The one that defines S0,S1,S2,S3,S4 and S5 power states) are dependant on each other. It's funny because I could sleep the machine, but it cannot turn on, which it's pointless, but since you stated it, simplifies a lot of the process.

[@serwiselektroniki4638]

Beautiful video, work with schematic and boardview - this is it. Thanks.

[@TheTarrMan]

Glad to see another mind-expanding tutorial.

[@SuperFez87]

Louis is the Michael Jordan of board repair

[@Arik253]

Amazing , really professional , thank you

[@seinfan9]

lol this is the guy that said New York is basically like living in hell. I'm trying to find power supply sequencing videos and you actually do electronics. Cool.

[@caminglis53]

Awesome stuff mate luv the way you talk about it!

[@mattePRL]

Just wanted to say I did yestarday my first MBP repair. It was for me, and it was quite simple - replacing Right side fan in MBP Mid 2014 but it felt gooood. Also my Motherboard wasn't in 10% that filthy as some you show. Which is nice.

[@SuperFez87]

This video is gold

[@davematthews414]

Really great video/info. A 'hidden'' gem. Thanks Louis👍

[@SUZUKIGSXR-R]

Louis Rossmann , great videos, keep up the great work ,best wishes .

[@ariesmactecintltd6432]

Thank a lot for the knowledge well shared Louise

[@therealspixycat]

Excellent!

[@mrfreeferrari]

you explained alot in too short. i used to get lost through the schematics. i really thank you so much for sharing such valuable scientific information so i dont just be the guy who replaces spare parts .

[@DavidiPro]

Hola amigo. Excelente explicacion. Saludos desde mexico.

[@saarike]

Really nice!

[@SevenDeMagnus]

Thanks

[@sarfrajahmad4307]

Very nice

[@francismannion7075]

Great video thank you!

[@selectorerwin1don12]

Looking ur videos makes me cry to know my mbp a1278 is down and their is a Genius so far away actually im South America Guyana ....laptop jus went blankout while djing ,never to power on again

[@mrfreeferrari]

by the way i watched your buck converter video yesterday which was fantastic too. if may ask for something . i need a video on how to read schematics drawings. you can refere me to other chanels but believe me when i tell you that i dont get bored from your videos like i do with others . you are focused and suffecient . a short video would do the job. for people who know what an inductor, capacitor and a resistor are an just would like to know how to read the flow of the current on the schematics drawings. Thanks again for all of your efforts

[@bonbonpony]

07:03 Where did those numbers come anyway? And why only the odd numbers? 15:47 The advantage of being your own boss: you can drink at work :)

[@arnonabuurs7297]

Understanding power rail sequence = 6554 views, Jason gets fired = 56886 views..... mmmm

[@machine85]

Drinking professionally - I.e on the job !

[@bivekbasnet2138]

Sir Thank You very much.

[@NicleT]

The dear under microscope is a great Internet moment!!!!

[@eek9369]

Do you ever use acetone instead of isopropynol?

[@kiddy1992]

I might be wrong but i think he is using ethanol instead of IPA. And acetone might not be a good idea depending on wether on not there is anything on the board that dissolves in acetone. Be it writing or something component related. one of the things i remember from chemistry is that depending on the plastic you might desolve it. which would really suck if you'd just put on a connector

[@MrocznyTechnik]

Once, however my wife hates my mouth smell after acetone, so I stick to isopropynol.

[@brainndamage]

Acetone melts plastics, so it'll melt your connectors and some components, which is not a good idea. IPA or denaturated alcohol doesn't do this.

[@eek9369]

Jernej Jakob Not to say your're wrong but I've never come across a board with connectors that melt with acetone, they're normally some nylon/PP stufff. I just find it a more aggressive cleaner and use it for flux cleanup. then an IPA final flush. MrocznyTechnik If it's a fruity smell on your breath it's a sign of poisoning. At least it is with IPA

[@jackthegenius1]

When Louis said S0... S0 rail.., it sound like "A**hole" haha LOL :D *Sorry for my language.

[@pilatepilate9840]

Never mind...well, unless you are an "S0 rail" that is

[@dixsusu]

Apparently that IC ISL8009B has a built-in thermal protection. When the internal temperature reaches +160°C, the regulator is completely shutdown. As the temperature drops to +130°C, the ISL8009 resumes operation by stepping through a softstart-up.(A way to verify if the protection is working from this point of view ). Depends on version A,B,Z and so on . I think like you Louis the last tech, person or what was ,who tried to replace it, he heated up for to long time at to high temperature making it unusable , there is a temperature profile to solder the IC check the pdf file for detailed info tb493.pdf for who wants to get in the technical hole, without proper tools and knowledge ( feel ) and information it's very easy to damage the part for good. Cheers mate... i just saw the stag on your video, while "treating" myself with that too.

[@blessingatirene675]

Thank you for the lesson. Good you explain how we can get our s0 state, but what I want to know, is how do we get s3 and s5 state quickly just as we located the s0 state by checking the left pin on the fan.

[@LiamGaughan]

18:48

[@TecKonstantin]

A Multimeter should never change its reading with low battery (maybe if the LOW BAT is showing on cheapies) and a Fluke it will definitely not change! You can try it could be interesting.

[@pldaniels]

Really just needs recalibration. I have seen a few meters that will wobble a bit as the battery starts fading off but certainly more often than not it's just natural drift that coincides.

[@TecKonstantin]

But not on a Fluke, on others that can happen. And if the Battery is low it will read often more because the reference is lower, it goes the other way ;).

[@paulhendrix8599]

I once had a multimeter that showed around 5 volts on a lithium ion battery. I was worried. Also, nice seeing you here.

[@TecKonstantin]

I hope it was not a Fluke on cheap once i had things like that happen ;), thx Paul someone linked me to here ;)

[@071Rishi]

what is the schematic software sir?

[@Alexw1100]

2:31 was that your oven baking a board? :P

[@finstor3386]

lol, for any of you knew to the show...I been watching forever and no idea what any of his stuff means, somehow I enjoy it though.

[@jvinsnes]

Measuring the fan pin on the red wire jumps between 5v and 0v on my Dell Precision 5550. No boot

[@johncajka5424]

we used to call your method of shooting that board divide and conquer.

[@rezonite]

A minute forty I already learned something. 😏👍

[@Webtroter]

I think this is a video summary of every thing you've done. Super Super simple explanation : Check Good lighting, screen, and cameras : Check Schematics : Check Jager : Check EDIT : The Doctor who said "Recreationnaly?!?!" : Check

[@ztronixz2236]

hey brother can i ask how do i remove shorted the vcc core ???

[@alro7779]

Very good video, dude! How could you check those power rails if your schematic doesn't have that information? Where could I find them on the schematic? Greetings!

[@MrocznyTechnik]

Big advantage of being an owner and commuting via public transport :) You can drink at work !!!

[@TheKaos90]

Are all of these things relevant only for MAC's ? I do component level diagnostics at a computer shop, but we outsource board repairs to others that that take a lot of time to figure shit out so i'd rather do it myself

[@bonbonpony]

Some of the details seem to be Mac related, but most of them are pretty common for all motherboards out there. E.g. I'm currently analyzing the schematics of some ACER motherboard and there are S0, S3 and S5 signals too, as well as switched-mode power supplies that generate those voltages and controller chips that tell the power supplies when to turn on/off. So I guess that most of the knowledge presented here is pretty general.

[@jimtalltheislandbrothers6639]

What is that software for the schematic?

[@smorrow]

pdf viewer

[@lovejoymakhaza5229]

Hi Louis. I got a Macbook Pro A1425 its turning on and off for 2sec continuously. What might be the problem

[@bivekbasnet2138]

Sir which Pdf Reader do you use?

[@rossmanngroup]

sumatra pdf

[@SoullessScythe]

hey, thanks for this video, i learned a lot, i knew nothing before, and i trust that if i had schematics like yours for something broken, im 99% sure i could figure out the rest. looks a lot like programming, of which i have 12 years experience. i guess you could say i know its a lot like programming, but hard to say when youve never worked electronics like that. gunna try reviving a dead graphics card ive had for years sitting in a closet. ill lyk if it works when im done. its a simple fried capacitor and some damaged pcie pins. its a simple fix, and i can see what isnt working on the board. just might need a new capacitor.

[@donaldhenke2750]

can you tell me what a k1117s15 is.please....

[@CircuitCraftsman]

Hi all, Should i solder a jumper over "Debug Power "Button"" in order to measure S0 and S3 rails ? All my S5 rails are present. My logic said yes, but i dont see anyone doing this as far as i noticed. I'm working on a 820-2567 Macbook pro 13" 2009. Old yeah i know, but just for practice. But the video was really helpfull, this is my first time troubleshooting a notebook. Keep up the good work :)

[@rossmanngroup]

S3 should be there while the machine is off. S0 will not be there until you hit the power button

[@metatronx6369]

Good morning Louis, have you ever seen the 33011 smart status IoRegistry error in ASD? The last test in the ASD Program. I've got 2 system that are failing the test that previously weren't failing and it's driving me nuts. Mid 2012 13" Units.. They function just fine but it's bugging me Thanks.

[@metatronx6369]

Did a format on one of the SSDs and now it passes the test, No more error. I'm not sure if it was the password on the user account that wasn't allowing ASD to read the smart data correctly... I'll run it again after I reinstall and see if it comes back.

[@rossmanngroup]

no

[@f.m.a5928]

Sir can you tell me how to find quickly the trace is open at a point but visually it is shorted.is there any technique to visualize the complete path of the the trace by applying voltage or current.

[@pr0xZen]

You probably figured it out by now, but for future reference, in many types of board software (like for instance ZXWSoft), you can see not only what parts are electrically connected to each other, but the physical layout of the traces, together or by individual pcb layer one at a time. Then you start at a point where the trace is good, then work your way forwards testing ie. every 3-4 connection along the line (to speed up the process), until you find it broken. Then reverse and trace your probe points back again, this time test _every_ single point along the trace (because now you have narrowed it down to a much smaller group of points to test) until you find the signal is good again. Your break will be in between your last two test points. Now you can follow the physical trace layout in boardview/zxwsoft or similar software, and look for the damage to the trace, or a blown resistor, diode, filter, fuse etc. If the line faulty is open when it should not be (not shorted), with no components in between those last two probe points, suggesting a mechanical break in the trace - you can add a jumper between those points. Don't do this if there is supposed to be non-capacitor components between those two points though, then you will be making a dead short on the line that is not supposed to be shorted, and can cause significant damage to other components further along that line.

[@FunGUyPie]

Hey Louis, did you mention in a video why you're showing schematics again? If you did, I'll go back through the backlog, but if not, I'm curious if that means you've heard back from Round-Shaped-Fruit Inc?

[@rossmanngroup]

I have 220+ videos with schematics in them. The difference between getting 220 strikes vs. 240 strikes will not make a difference, my YT acct would probably be deleted regardless. If it was 1 video, sure, but 220... eh. Might as well keep on keepin' on.

[@kindisc]

be the whole bitch, eh.

[@lucataszarek8782]

Jäger master 👏👏👏👍

[@Stratos1988]

It's so damn difficult to find multimeter with auto off for an acceptable price for a weekend warrior.

[@josephbohme7917]

Never quite understand that with proximity to all these small solder contacts that they do not bridge when you push the device on. Why doesn't the solder flow to the adjacent leg or chip (causing a cross or short)

[@fd3871]

Hey Louis I'm curious, but why don't you just use a clip on mic system like the Sennheiser G3 or AVX with like a Sennheiser MKE2-EW Gold? Seems like it might be more comfortable than the headset as you just clip it on your lapel.

[@rossmanngroup]

+Alexander Fagard way too much noise from fume air filter and air conditioner

[@tehjamerz]

+Louis Rossmann just turn of the AC for an hour while you record 👍🏼😂

[@tehjamerz]

Off*

[@rossmanngroup]

tehjamez fuck that

[@tehjamerz]

+Louis Rossmann hahaha :P

[@ws_stelzi79]

Luis for your information: Using Celsius you don't enrage enginers and everyone outside the US. Why so friendly to people?

[@rossmanngroup]

I prefer fahrenheit for room measurements because of greater range. There are more steps between 32 and 212 than there are between 0 and 100.

[@ElvianEmpire]

well, whole steps. As a european I'm used to the decimals ;)

[@paulhendrix8599]

+ElvianEmpire The great thing about metric is that it makes sense.

does ppv1v5_S0 generated by the CPU? I am missing that rail dead macbook air 820 3437

[@JesusPerezRod]

Someone new to the "show" 5:45 :)

[@mohammadayazsiddiqui2376]

I have to become a electronics technician like you .I have basic knowledge and interest .please advice me to become a good technician.

[@techbit7607]

My apple macbook pro 13" 820-2936 logicboard has S0-S5 states, but it turns off and turns back on when I use software only, I swapped ram pc38500 still keeps doing the same thing. It freezes in s3 state but I can put it to sleep. The freezing is intermittent comes and goes as it pleases, any ideas Louis? best regards

[@priatnasuardi]

does everyone got the schematic for mac pro 2010 psu?

[@GonzoAndFriends]

18:41 that’s what she said

[@voltlog]

Multimeter accuracy has nothing to do with its battery state of charge.

[@hurd23]

35% alc. by Vol. = 70 proof Sure doesn't taste like it but it will feel like it after a bottle haha

[@hurd23]

Btw, Awesome video. Cheers sir!

[@MrocznyTechnik]

I guess you should try polish vodka.

[@craftmasters1]

Louis, Why does a spinning fan mean everything is working

[@kindisc]

you should watch the vid again, the fans power rail is essential to the other rails, so if 'its working everything else will be, as far as i can understand.

[@pr0xZen]

@@kindisc Well "everything else" should be _getting power._ There are still many other things that can go wrong, that do not significantly impact the power rails. Like for instance a display output driver or supporting components, or in some instances a charging chip while there's still juice left in the battery.

It is O-Deer-God

[@ALYOUTUBERZ]

not worried about being a genius my ac adapter power block to my audio mixer just stopped working 3 week wait for a new one I can only get it from the maker of the mixer needless to say the block is half way sawed open & browsing you tube trying to figure out what to do lol

[@MrRobbyvent]

Back to schematics ?! ... I 've missed something of the show lastly.

[@andrep1784]

jägermeister is good stuff !!!

[@MNMTX]

the only question that matters: is this late-night board repair or early hunting?.. What is the meaning of all this recreation? We need explanations.

[@Hannibalonthelamb]

I'll just say what everyone is thinking, you need to change shirts more often.

[@fd3871]

nobody is thinking that

[@Hannibalonthelamb]

If I'm thinking it than nobody is not thinking, because I'm someone and somebody had to say whats on our minds.

[@larserikjensen4459]

I didn't think that.

[@TonyToneFixMyPhone]

I just wear a face mask if I'm heavy soldering. Think that ain't good enough?

[@SoullessScythe]

you drink professionally and your not hitting 100 proof. pfftt my office goes hard ig

[@Naton]

chip has power and everything but goes ahead and change it anyway. ANNnnnd it works... because logic... Kappa

[@lbond000]

I have no idea if the label that is being shown is real, but please use wisdom and don't publicize what you do in private.

[@dreamstrack9814]

Bro can you give me a1278-820-2565-a bios file

[@worldstarmb]

ehh

[@aaqibqadir2578]

Sir Louis if I had money into my bank açcount I'd have sent all to you. Big Fan from Kashmir

[@071Rishi]

what is the schematic software sir?