Board Repair Basics #4 - PP3v42 

Haha! Beautiful! I'm just curious, were you using your own schematics or just referencing the video?

Yes agree

Lasse Vorrsjö me too

super agree, i look rossman videos as well but he speaks a lot faster.

so true idk y i pay money to my college

@@pavulzavala9412 I know and Rossmann is great too but I feel like this guy slows it down in way to actually understand what it is doing. Rossmann is like here we have a macbook and I will only show you what you need and skips stuff and assumes we don't need to know it in more detail but we kinda do lol.

Same thing happened to me 😐

yea I can't play it on 480p idk why !

While on the boardview, when I hover over the pins it shows me what they connect to. At exactly 3:03 we can see that C7330 pin 2 is marked GND (ground). I didn't make that very clear though! The schematic would've shown it more clearly if I'd switched over to it. It's also worth noting that the vast majority of capacitors are power related and connect to ground as well, so it's a reasonable assumption that any given cap probably has ground on one side.

The 'dead' readings are millivolts, he was looking for volts.

Ground is equal to negative

I use naked eye for the most part, but I've got pretty good near-sight. Ultrasonic cleaner I want, but I don't do enough board repair these days to justify the cost!

Adamant IT a good 99% rubbing alcohol brush down is sufficient? thanks..yeah, a suitable sized ultrasonic cleaner is a bit high $$ but a good investment. 😃 also, do you have a laptop battery rebuild video? thanks

Yea alcohol works well enough for me. Ultrasonic might save a liquid damaged board without you even looking at it though, so that's when they can pay for themselves. I have a LiPo series about tearing down batteries, but I don't have any battery rebuild videos yet, I generally replace them.

Adamant IT ok thanks again

Exactly i noticed that too .. that's a weird multimeter for sure and it made things a bit confusing

Display was on the millivolts range. We were expecting 12.6volts. There won't be 130v anywhere in a laptop.

Yea I need to get myself a microscope really, but scopes make it a lot harder to get really nice camera shots of the work. Most cameras that are looking through the scope give a very narrow field of view that I find makes it hard to show the context. I found myself looking at videos and thinking "ok he's soldering that bit, but what is that? What am I looking at here?"

@@Adamant_IT thanks for the reply. I saw you did a series of videos on how to. I wish i did all this in the late 90s when i was fixing stuff 6 days a week but it was often more time efficient to replace the boards. I worked for Dell on site and nobody every fixed stuff. Simply remove main board etc.Back in the early 90's it was common to fix boards then though as prices were so high and it was just more normal.

There's always an equivalent of a ppbus_g3h, which is usually just charger voltage (19.5v) going through to the secondary power supplies. PC laptops always run 5v and 3.3v rails, which are also usually Always Hot (with exceptions). The nearest equivalent to the SMC and pp3v42 is the EC (embedded controller) which usually has it's own small 3v supply, but generally you don't go anywhere near that unless you're into very high-end repair work. Most PC laptop board faults are short on the main power rail (dead capacitor somewhere) or a corrupted BIOS.

I use a Logitech BRIO to make the videos, and solder by eye. A microscope would be a better setup, but a scope that can also record at decent quality is very expensive.

Logitech BRIO at 1080p60fps. My modern videos have studio lights on, instead of the ghetto desk lights in these older videos. Modern webcams are pretty good if you give them a lot of light to work with!

Yea, there's a couple of give-aways in the schematics. Power generally flows left to right on the page, so incoming power comes from the left, and outgoing power exits to the right. Then signals usually have an arrow on them to indicate if it's a signal in or out.

@@Adamant_IT thanks for the response

A 'hot' line means that it's always on as long as a power source is connected. Even when the laptop is 'off' a 'hot' rail will still be powered up, there's just no current draw on it until the system turns on.

@@Adamant_ITahh that makes perfect sense , thank you

@@Adamant_IT thanks for your help, and sorry to bother but where i found the board views files?? thanks again

@@luiscay839 search on Badcaps site www.badcaps.net/forum/ Some here too www.apple-schematic.se/board-ids/