Hello guys! How are you? Edgar here once again to greet you all from YoReparo
Welcome to lesson #47
It's been a long road
we have passed through a lot of things, we have been learning
this, in the easiest way, we started from the bottom and step by step
we have reached an experienced level
please, first I hope that you're taking notes
Secondly, I hope you are practicing
and thirdly, I hope you will repeat these videos as many times as you need to
we'll never take down these lessons, they'll stay here on the channel
apart then, I will give you the information later, it will also be free on our website YoReparo.com
there you will have them in order, so you can study as many times as you want, anywhere and anytime
So, today's lesson is an easy one, very simple, but I don't want to
leave many issues aside or generate many doubts, and I know that there are
many things missing
in the 50 lessons that the course has, I tried to cover the most useful topics
some component tipics are missing, but we'll see them once we get on schematics, so
today's lesson is called Line or Component shorted
this is a very easy lesson, it will only take you about 2 minutes to understand it
throughout this course, you have listened to me many, many times
talking about lines, those famous lines
I have always made a drawing like this
and here we could find capacitors here or maybe an IC
and I made those drawings with a lot of stripes
but probably some of you didn't understand
let's go to the ZXW
and let's make a simple example
I'm going for the connectors, I like to explain with the connectors because is easier to locate them
so, for example, here I have the connector, the J2019
this connector, if I touch the pin #2
it says it goes to this capacitor
then it goes to this filter, it is a component in series
if I touch it, to the other side of the filter it is like a jumper
it goes to 3 capacitors
it goes to the circuit U1502
and one side of the diode, that's the diode cathode
so
this is the cathode
so, this for me is a line, when I say
"this is a line" I'm meaning
this comes from here
a tiny stripe, I touched the #2
it went through this capacitor
then it touched a filter, the filter is a jumper and it went this way
then it went this way, passed through 3 capacitors, and reached here, here and here
so, all this components are on the same line, there's a diode
there's a circuit, 3 capacitors, a filter
here's another capacitor and here's a connector
if I could draw this, it would be something like this, this is a connector
here's the pin that I touched
this pin goes to one capacitor
one pad of this capacitor goes to ground, so this is a parallel capacitor
then it goes to this filter, to a FL
then continues and reaches an IC
before reach the IC, there are 3 capacitors here
3 capacitors and also over here
it connects into...
I'll draw it over here, I don't want to but imagine this is a diode
this is a diode, I'll draw it like that, so it connects with this diode
with this, I can say here are 1, 2, 3, 4, 5, 6, 7, 8 components
8 components that are hung on the same line
it's very important that you understand the ZXW, how the line is distributed on the board
on the tablet I draw it like as a simple straight line but
I'm trying to represent what it looks like
on the ZXW
So, we need to learn that, for example
if this circuit, I'll change the color to a pink one
if this circuit gets shorted
this line over here for "X" reason, this is an example, will get shorted this one, this, this and this
probably the filter is in short?
Is the filter shorted? A short-circuit beep will sound, but that does not mean it is shorted
if I touch continuity here it will short-circuit beep, and this also will short-circuit beep,
everything will do it, why?
Because it is a line in short
a shorted line, okay? so
a shorted line will place all its components in a shorted condition
so, we need to know the difference between a line in short and a component/circuit in short
in this case
the line would be this one, but
the component, or circuit in short would be this one
this is the difference I want you to understand
a shorted line is not the same as a shorted component, for example
let's say for example this line is for backlight
in the measures that you will see once we start with the protocols, this line over here
if I touch it, it shows continuity
an example, continuity to ground
the pin shows continuity to ground
but not because the pin shows continuity I'll remove it
if I touch here it will short-circuit beep, here too, here too, or here or here or here or here and here too
the whole line is shorted
but only 1 component is causing the short
so here we can use the voltage injection
we can see it on the video that I'll leave here
where we can inject a voltage and see
which component is shorted, see if it is a component or a capacitor
if it is the circuit or something else that we'll see later once we start repairing
that's what I wanted to explain you in this lesson, as I told you, is a very simple lesson, but I don't want to
I don't want to leave any doubt, I don't want to leave any questions in the air, so that you can understand well
so, we could have a shorted line, for example
if this line had a voltage
let's say this is shorted, all the current goes through here
but if I touch the filter, it beeps
we removed it "Hey Edgar, the short from here is gone"
of course, remember the filter is a wire, so what we did was
remove the short that goes this far
but it didn't reached this, because we removed the filter
the filter was our jumper
probably the filters can help us
to know if the short is on this side, or this side
but, know the difference
when one line is shorted, it doesn't mean that because it beeps you'll remove it
it doesn't mean that because it gets hot you'll remove it
it doesn't mean that because of its impedance or because its diode scale lowers you'll remove it
remember, there are a lot of components hanging on the lines
can be any component that is causing to the line
short-circuit, leakage
a resistibility or low resistance, but
we have to find the ingrate who is causing this
So guys, mark this lesson as completed
tell me here below how are we going
tell me if you've been learning a lot, I'll read you
take care and we'll see you on the next lesson