Guys! Give me a sec... there it is
How are you? Welcome to another lesson
we almost start with diagnoses, we're almost there
with the schematics
but before we get into that, I want to comment you something
we have to learn some things here
I will set the tablet to record
We have to understand some things. What things do we have to understand?
First of all, we have to understand that every circuit is, internally, sectorized
What do you mean by sectorized, Edgar?
For example, the Wi-Fi IC
this is a Wi-Fi IC
this IC can be sectorized, on one side, there are the antennas
on this other side, there's the Bluetooth
this side is for Wi-Fi
for those who don't know, the Bluetooth comes along with the Wi-Fi IC
and this side here for data, for example
this is just an example
so, there are 4 sectors, imagine it is a house, the circuit is a house and it has
the kitchen, the living room, dining room, the main room, the children's room, etc
so, the house is sectorized, okay?
if any room is on fire, or the kitchen is on fire, everything catches fire
The same as the circuit, a circuit is sectorized
if any sector is damaged, the whole circuit is damaged
this is just to get us started. Now
both the sectors and the circuit need to have 5 aspects, 5 lines, 5 commands, 5 instructions, or whatever you want to call them
very important. First
my circuit needs its voltages in order to function
no circuit will work if it is not powered
later we'll see how these circuits are powered, so
all circuits must be powered
Point number 1
Point number 2
all the circuits must have Ground, at least one outlet to Ground so you can close the circuit
every circuit must be closed so it can work
that includes, which we will see later on
for example, these Grounds are one Ground
but in some cases we'll see that there're some circuits that have a lonely Ground
that's because they are independent Grounds
that Ground is only for one sector
so, is very important that we see on the schematics the independent Grounds
so we can rebuild those Grounds
in the circuit, they're not the same, from all the Grounds some could be independents
when it's soldered, everything is Ground
but what if this pad was missing, where this Ground was soldered
this Ground will not make contact with the rest, nor with the board ground
therefore, in this sector, the circuit is not closed
Point number 3
it needs data
What do you mean by data?
the circuit needs instructions
it needs a power-on signal
someone to say "Dude, turn on, it's time to turn on"
then it turns on
it needs a line, that we'll see later, called Reset
the circuits restart are lines that say "Look, they've turned you on, but go take a shower because we are going to go out"
"Get ready, because we're going to start working"
this is a reset, resets all circuit errors
so that it can be reset and the circuit starts working without errors
it needs a clock signal
or CLK
it need someone to say "time to work, not yet, time to work, not yet" someone to say at what time to work
and between all of this, it needs more data, more instructions
what time is it, what to do, raised the screen brightness
I don't have charge, I need more
and many things that we'll see later
all circuits need these parameters
or these lines for the circuit to work properly
once we get into diagnoses, we'll interpret all the lines that do that
there are some circuits that are powered, clock is OK, Grounds are OK, data is OK
but if you don't turn it on, if the line of power doesn't work
is like take a shower and go to bed
I took a shower, had breakfast, someone asked me out, but I still went to bed
because my doorbell doesn't work
nobody came to tell me "Edgar, let's go"
so that is something very important for you to take in mind
I just wanted to remind you, because we are going to get a little bit more into the topic
remember that we started with Voltage, Current, so now we're like here
now we will get into a little more difficult topics
review and write down notes because the exam is not far away
So, guys, a hug, I say goodbye and I'm going to rest because I've recorded too many videos
I'm really glad that you're enjoying them, because
sometimes, as I said at the beginning of these videos, one just want to try harder things
like, they don't want to try easy things
I said "Well, let's start with it"
and I'm really glad that you're enjoying the videos and that you're taking advantage of it
I get a lot of comments and trust me, I'm trying to read them all
answering them all is a bit complicated because I receive like
200 or 300 comments every day but
thank you for all your support
share this video, leave a like please
and tell to your friends that we're learning a lot
a hug for you all, and we'll see you on the next lesson. Bye!