Hello everybody, welcome once again to another video
today we're going to continue with Power Supply part 2
Edgar here, greetings from "Yo Reparo" hoping that you're allright.
Here we'll continue with the video marathon where we're gonna create the bases so you can understand
when you're measuring or fixing a motherboard
Thank you so much to everybody who has been supporting me on this
I'm actually on Guatemala and I told you that I'm making all of this, because
here I don't have many motherboards to test or study, so
I decided to make this video marathon to help everyone who just started on this, so
thank you so much for everything
From the previous video we learned that the power supplies must be
about 5 Volts or above and it must give 5 Amps
Why the power supply of 2 Amps doesn't work?
Because the new phones consume more than that,
then what happens is, if the consumption it's higher than 2 Amps, it will reset the phone
So, we will be working with power supplies that have 5 Amps
power supplies that have at least 4 digits so that way we can see the lowest consumptions
and we can interpret them out later
We also need to know that there are 2 kind of power supplies,
they're the digital ones, we can see the numbers, or the analog ones that have a pointer, these two works exactly the same
This one over here have a lot of options and buttons so we can configure it
but if yours only have turning buttons it's okay too
the only detail here is the power adjustment,
we have to link the two outputs to adjust it, so that way, when turning on, it will generate the output
It's not like the one I have here, when I press On or Off, I can configure it before it generates the output
Well, let's cut out the chitchat and get here
here we're going to power the phone,
in this case we need a Voltage of 4.1 Volts to power this phone and current of 5.1 Amps
So Edgar, how much we need to put there?
remember, the phone will consume as much it needs it
but if there is a short, it will take the 5 Amps and leave them on the short
what we have to do if we find a short,
change the current, lower it and test it gradually
So...
I have it here in stand by
if I press Off, it generates the output
here says it's powering the phone with 4.1 Volts,
then why it doesn't shows consumption? Why it doesn't shows the current?
Because the current it's not flowing
Let's go to this camera
if I put this cable over here
let's put the cable here
okay, now I'm going to turn on my iPower
I turned it on
let's go back to the other camera
and we see there's still no consumption
Why there's not consumption? Cause the phone it's not turned on
I turned on the iPower, later we will see what's this tool about
but I haven't turned on the phone
Now, if I have a phone and I haven't turned it on, and shows consumption,
we can say there's a initial consumption
Why? Because no phone consumes anything when it's turned off
in this case, we see it's turned off, it doesn't consumes power,
so we can say this phone it's fine
Do this practice, get any phone you have, connect it to the power supply and check if there's a consumption
That would be the initial consumption, we don't have, then we're good
Let's get here and now I'm gonna turn on the phone
I'm turning it on and here we see the phone's consumption
As we learned previously, unit, ten, hundred, thousand,
so here, if it consumes this
it would be 1 Amp,
here 200 milliamps,
here would be 20 milliamps
let's do it like this
here I have 5 Amps,
if I put this on 0,
and here 100, then I have 100 milliamps
ok? 100 milliamps
now, if I change this to 0 and put 1 here,
here I have 10 milliamps
now if I put again, 0 here and put 1 here, here I have 1 milliamp
we saw this on the previous lesson of Equivalences
Okay, we're going to put 5 Amps on the power supply
5 Amps to make it work, press On, and now turn on the phone
well then, here we see our consumption,
so I can say,
this phone has a normal initial consumption
these consumptions that we see here are normal
We will be learning all this process later
What I want you to practice is this
When you get a phone, it doesn't matter if it's for screen change or battery change,
always connect it to the power supply
You can't work without a power supply,
it's impossible to work without one
Why?
For example, I got a phone for battery change
"My phone drains too fast" okay?
What I do is change the battery, but why we do that?
First we must check, what if,
if you connect the phone and there's an initial consumption of 60 milliamps?
60 milliamps with the phone off, that means there's something draining power,
which means battery draining
That's something you must take care of when you're fixing a phone
Always support on your power supply
Now, why I told you to connect it even if it's just a screen change?
You have to get very good once you know the phones consumptions
when the phone it's turning on the sectors
here we can see
the power consumption
and later we can interpret those consumptions and tell
I have a phone that stays it's consumption in 250 milliamps
What is it?
"It's the tristar" someone will say
Or I do have a consumption of 658 milliamps
when I press the power button, what could that be?
Probably it's the Wi-Fi
Or how about, we press the power button and goes to 1.5
probably it's some area of the NAND that's consuming
Then, why I'm saying this?
Because
when someone watches differents consumptions everyday
there's a moment, for example, where the Tristar, who's the charging IC
fails
you already know what's the consumption of that IC, so
for me it's impossible to tell you
"Look, this consumption it's because of that, this other one it's from that IC, this consumption it's from there"
You will learn many consumptions, but that will take time
for now, what I want you to understand it's what this is showing
it's my consumption, a turned off phone will never consume power
and a phone on stand by never consumes power
what does it means "stand by"?
when the phone loads all the information and shut down the screen
in this case I don't have my phone, but with the screen off
that means the consumption must reach 0
let's make a test
let's turn on the phone
here I turned on the phone and we can see the consumption
the consumption varies, later we'll see this in a graph, that will be in other future lesson
so here I can see what my consumption is
if I see these consumptions I can tell "That phone turns on" but why? Because
I've already saw this many times so I already know mostly of the consumptions and stages when the phone turns on
that we'll see it in the Power On lesson, but for now, we're on the power supply, what is it doing and what you're watching here
so, the phone it's consuming because it's loading all the info of the user
it's turning on all the peripherals, etc
Sadly I don't have a screen to show you
but check this out
here the phone it's on, and now it's on stand by
What does that mean?
I turned it on, and connected the NAND, connected the CPU, wake up everybody
and now the phone it's going down, the consumption it's lowing
that way, when the phone it's on my pocket, it will not consume battery
why would I want a phone that even with the screen off it's still consuming battery?, so
if you pay attention, this sometimes takes 5 or 6 minutes to go down to 0
when you take a phone for battery change, the first thing you have to do is
1- Initial consumption, does it have it or not?
2- It goes on stand by or not?
in this way you will know if the phone drains because the battery it's damaged
or, the problem it's some circuit that's draining power, and that's why the battery discharges
remember the battery it's full of electric charges
we can see the phone still does not stand by
I could wait for 10 minutes and see if the phone goes stand by
let's wait for a moment and see
okay, it's already been like 3 minutes and the phone never went to stand by
it went to 15 but still goes up
here I would need the screen, but sadly I don't have one to test it, but
I need the screen to check if the phone actually turned on,
or the phone shutted down the screen
and I want it to stand by
so what you need to learn is
a phone turned off doesn't consume power
it shouldn't show consumption
and
when it turns on everything and must go down, and shut down the screen so it can be on stand by
the phone has to reach a consumption of 0
Now, talking about consumptions, that's something we'll see more in depth later, but
what happens if I have this over here? Look
I have this
by now I have it on stand by, but
I'll turn on the power supply
we're going to make a short circuit on purpose
let's go to the microscope
I'm going to make a short on this capacitor
so, let's
attach this capacitor
to cause a short
okay then, I attached the capacitor
to GND
I'm making a short on purpose
so, watch what's gonna happen
when I connect here
here I connected the phone
changing to this camera
here, the power supply isn't on, ok?
if I turn it on, check what's gonna happen
remember, a phone that is turned off, without the power on order
do not confuse turning on the power supply with turning on the phone
I'm going to disconnect the cable, when I do this, I'm turning on the power supply
now I have to turn on the phone
but, what I put in short was a main line
so, check what's gonna happen
I turn it on
turn on the iPower and see what happens
it's consuming
when I connected it, it starts consuming
we can search it if we...
let's go to the microscope
and freeze it
I froze it
you can't see it from here
look, there's warming all that area
so this is a short circuit, ok?
what we caused here was a short
now lets remove this
see the difference
ok, I removed it
just removed the short
now I'm gonna
connect this again
now, it's on
and what happens with the power supply? It doesn't shows consumption
because I haven't turned on the phone
Now, if I turn on the phone, it starts with it's normal power on cycle
Later we'll see what are the initial consumptions, secondary consumptions,
everything about the one second power and all of that
for now, we have to understand that
the power supply doesn't show consumption if the device is fine
if it shows consumption, it means there's a short
all consumptions, all of the phones
for example, on iPhone it has to start with 70, 90, 100, then 150, 200
then 300, 400, reach the peak of 1, connects and then starts to go lower
That consumptions, those peaks it's what I want you to learn
Everyday turn on a device
and see those consumptions, because it's the only way that you'll interpret consumptions in the future
Remember, in this lesson, only talking about power supply
not talking about the glitches or consumptions
the most important thing it's that you understand what do you see in your power supply and know what does it do
Ok then, hugs to everyone
it's a pleasure to greet you all
and I'll keep recording videos for you, bye!