In this video we are going to learn how I fixed this iPhone XR that didn't turn on and showed crazy consumption
Hey guys! How are you? Edgar here greeting you all once again from YoReparo
very happy to welcoming you gentlemen, or ladies
to see your happy faces
Today we have this iPhone XR, it's already repaired
with this iPhone XR today we are going to do a different modality with the video
comment below what you think, if you prefer a summary or the complete diagnosis here
and talk about what I'm doing or just a summary to make the videos shorter
I talk a lot, so
this phone was sent because by just connecting it it showed a consumption of 1.2
an initial consumtion
when we have an initial consumption, we have already learned that it is due to a problem in the main lines
"This is an iPhone XR, Edgar, the drawings that you've made don't work here"
Let me tell you that they do
is exactly the same and it's what I've always tried to tell you
the bases, if you have a good bases, you can repair high-end phones
without many complications, because it is quite similar
I can't deny that there are some things that are different
but the bases are the same
this phone had a consumption of 1.2
and stayed there
remember that a visual inspection should always be made
we saw that two circuits were wet
then out of distrust, we must always start with the circuits that are wet
and then we had to remove them, clean them, remove all of the tartar
and put them back
one of the circuits broke
one of those circuits was Tigris
this has a similar operation to what we have known about the iPhone 6
but it broke, so I had to put a new one in
I had some new circuits, so
I replace it, cleaned it, applied alcohol to it, and we saw
that the phone was still consuming, by just connecting it to the Power Supply, the numbers flew
so we noticed that the CPU was heating up from the top side
for a moment I was worried, I thought probably the CPU or RAM had a short circuit
and that was the reason of why it was heating up
but then we noticed it was a speaker amplifier, for the hearphone at the top
remember that the new models, starting with the iPhone 7, have 3 amplifiers
because the upper part works as a speaker
it is a speaker, when I take the phone away from my ear, it sounds from below and above
and that's why from iPhone 7 onwards it sounds louder
so, this amplifier was getting warm, this amplifier was for the headphone which is located in the top speaker
so we had to remove it and clean the area
and cover everything that was scratched
then we removed from a donor board
a donor board from iPhone XS, they have the same amplifier
in theory, the amplifiers have a different number
like U49 something the other 59 something
but they are the same, the 3 are the same
we took one from the iPhone XS
and put it on the phone, then measured, the phone didn't have any consumption
we put all of it's shieldings and the phone turned on
The End
was very simple, a diagnosis that we need to learn, this is where
I'm going to explain a little
I've always drawed that
Let's do a drawing here, for example, here I have the Power Supply, ok?
this is the Power Supply, and I had an example
it had 4 volts 5 amps
when I connected it, it went to 1 amp
remember the Power Supply it's connected and reaches a connector
this is the battery connector
here when I connect it, the battery line is generated
right? This line will be called Batt
Now let's see on the ZXW
and let's see how this line is called, let's check the model XR
and let's
touch this, the positive pin of the battery, which would be this one
and the battery is called exactly the same as previous models PP_BATT_VCC
Ok? This battery line has to reach a circuit so it can turn into a main line
what I've always explained
so, this will reach a circuit called Tigris
Do you remember that other models had a Mosfet? Well, in this case, there's no Mosfet
Here's only the Tigris, battery goes in
when Tigris by a line that I'll show you
detects the line has more than 3.4 volts
thus, the battery line joins with Tigris and becomes a line called VDD_MAIN
ok? VDD_MAIN
Now, in the case of iPhone XR, let's see here
this goes into Tigris, one of the circuits I replaced
the U3300
this circuit, if I touch here, a line called PP_VDD_MAIN_YANGTZE is generated
I don't know how to pronounce that
so this genetares a line called YANGTZE
if you notice, the XR only connects some speakers
I don't want to take too long explaining where that comes from
this will also be helping
but there is a resistor here, the T3303, look at what is next to the resistor
PP_VDD_MAIN, if we continue with the drawing
this reaches a resistor
and from here is now called, let's change color
and the line is now called VDD_MAIN, exactly the same as iPhone 7
and this one powers many circuits, 6 circuits over here
7, 8, 9, 10, 11 circuits
and many components, so let's put here
let's say there are 70 components
between circuits, coils, capacitors, whatever
among the circuits that were being powered was our friend U5002, which was here
so what happened here, if we continue the drawing, here was our amplifier
the U5002
this amplifier was sad, it didn't want to work today
it was crying
it was crying, there, ok?
So what was going on?
Because this is all one line
here I had a consumption of 1 amp
Why? Because everything is connected
the current came this way, passed the battery
from the battery to Tigris, Tigris said "it has more than 3.4 volts, I will convert it to VDD_MAIN_YANGZE"
came this way
then passes through the resistor and becomes VDD_MAIN
came this way
now here
and here was our circuit that was sad because it didn't want to work today
so, everything is connected
I forgot this, if I would have measured VDD_MAIN there
probably the line would not have beeped to ground, that's the most interesting thing here
probably because the line was not grounded
it was a circuit that was being powered by that line, and it was causing that consumption
that's something that could probably confuse you
but we just have to check the main consumption, if it has a main consumption
look if it has VDD_BOOST if it has VDD_MAIN if it has VCC_MAIN
any main line, you have to look for the culprit
"Edgar, how did you find out that that amplifier was the culprit?"
Because it burned my finger, I put my finger on it
it's no big deal
"Sure Edgar, there are consumptions of 20mA, very low consumptions that we won't be able to find"
but we have to measure
so this was an easy video, the phone here it is
then the phone, if you noticed it
we connected it to the Power Z, it's very important, if you don't have it, it's very important that
after the repairing, you must comprove that the phone has a normal behaviour
the phone turns on, when the screen is turned off it goes into standby state
so you don't have your client back because "The phone now discharges"
"It just wouldn't turn on and now it's discharging"
you know how the clients are
And for me it was a pleasure to come and greet you all, it's always a pleasure to come and share
very happy to be always sharing a couple of things, this micro soldering thing
the board repairing, it's something very pretty, it's something that I enjoy doing
and over all, I enjoy by sharing it so you
can take advantage, and when you see me you can invite me for a cup of coffee
So, gentlemen, it was a pleasure, take care, and
we'll see you in the next video
Bye!