here we have another MacBook
let's take apart this MacBook everybody
here by the way say hi to new guy he's
lasted two days without getting fired
this is like a record this is a new guy
he actually fixed a few boards some
missing p.m. sleep s4 ELLs on the first
day that impressive what is the
destination physical address in the IP
RF request packet for device 192.168
that for four that's six for someone's
trying to get me to do their homework
for them this no I'm not doing your
homework for you this MacBook is drawing
point 1 amps what's not turning on let's
see why it's drawing point 1 amps
without turning on first thing we have
to do is take the board out of this
MacBook now typically a machine that's
drawing point 12.15 amps is one of two
things behind door number one or short
to ground on PP bus g3 huh behind door
number 2 every rail is coming on besides
CPU v core because of a lack of all sis
in order for the machine to provide CPU
v core all sis power good must be
present so let's see which of the two
options it is here first thing we're
gonna do is get our multimeter on the
screen and measure for a short to ground
on pp bus g3 hot and this can be seen
there's no short to ground on PP bus g3y
point that's 400 kilo ohms about and
next thing I'm gonna do check out the
rest of the board they're gonna hunt
corrosion so let's look under this board
under the microscope see what it looks
like around the offices powers in area
now this is a board that the customer
claims was never damaged by liquid and
my assistance is left
cease do customers lie in your industry
as well yeah oh look no liquid damage
that's a whole lot of no liquid damage
right there alright and I'm gonna take a
wild guess that that is around the
offices power good circuit so this is
going to create allow ALS's power get to
be created if you have this PP 5 es o EP
3 v 3 s o PP 1 v 5 s Oh and then you're
also going to need this prisoner over
here which if p.m. sleep s 3 L is
present which is required to get out of
an s3 state and up into an Esso state
it's going to if you have P 1 V 8 s 3 P
good p v es 4 hours 3p good P 1 vo 5 s o
power good DVR power good then you'll
get all says power good and we have our
8151 NR 81 52 corroded so let's take a
look at this MacBook that Apple needed
750 dollars to fix with no options for
data retrieval because it's Apple why
would they unscrew this SSD and plug it
into the new one when they could just
not do that why would they copy the data
off of it while they're charging you
$750 when they can just not do it and
get your money anyway why bother
so here we go we are just gonna
refurbish those resistors it's a little
bit of refurbishing all right appears
those resistors are a little beyond
refurbishing so we're just gonna get rid
of those two resistors I was trying to
save 17 cents can you blame me decided
to get my speakers in my apartment fixed
decided to get myself a couch a
headboard for the bed you know some nice
stuff to commemorate being 30 so you
know we are we are trying to cut down on
on spending resistors are expensive you
know this [ __ ] adds up after a while so
let's just get rid of that other
resistor
come on resistor
bye-bye
we got to do a little bit of fixing on
those pads over there now is there a pad
under there or is that is that dirt or
is that a genuinely destroyed pad right
over here let's see if we can bring that
back oh here we go
so the thing is we want to scrape hard
enough to get rid of the corrosion but
not so hard that we removed the pad and
a new solder a new flux as we go
scrapings gently with a strong metal
iron and you have the heat up high it's
gonna remove all that dirt
okay yeah we're just gonna clear away
some of that flux that we can see things
a little better
and the pad that's been fixed could
still use a little bit of work it
doesn't look like we used enough flux
the first time that's what happens when
you listen to Paul never listen to Paul
you're gonna put a proper amount of flux
there not the bigger the glob the better
the job now see how when we put the
proper amount of flux there how much
better it looks see how I just got to
see how that path the solder just
fitting onto it beautifully that's
because when you use a bigger glob you
do a better job but Paul doesn't want
you to know that because what Paul wants
to save all the money for himself but
that's not what I want see unlike Paul
unlike Paul who's not here so we can
totally shitcan him and I talk bad about
him until tomorrow of course I care
about you all and I want to see you do
well which is why I want you to amuse as
much Amtech and see 559 V 2 TF flux
that's available at store dot Rosman
group comm that makes me more money the
more you use as were necessary to get
proper pants the bigger the glob are the
better the job the bigger the glob the
better the job bigger the glob the
better the job the bigger the glob by
the way have any of you met somebody who
has their computers their profile
picture look like this like instead of
having the profile picture on their
computer be their entire face anybody
that does this thing where it like crops
out the sides of their face and it crops
out their hair so it looks weird what do
you think of people who do things like
this you probably think that they're
weird right but kind of being a like a
ship posting troll for a living almost
why would somebody do this I'm just
curious
any of you have an answer to that
never understood the obsession with the
half-face thing okay so now you've got
those beautiful beautiful paths that
have been restored through the magic of
antique flux that's available at store
osmond group comm remember we're not
telling you to use more flux just
because we want to make more money from
you using more flux it's a totally
selfless this is the proper amount of
flux that you're going to use if you
want the job to be done properly this is
what we do here at store dot Ross bean
group.com oh yeah
because looking at the store many of the
products of a picture of your cat yes it
got hacked and when it and then [ __ ]
up a lot of my pictures I'm gonna have
to have somebody go through that at some
point I just need time love your channel
thanks for the thousand dozens of hours
of entertainment had a question what do
you recommend for Android smartphones
currently using an LG g4 I love it but
it's looking rough
Motorola really I think Motorola has
some pretty good offerings especially
with the fact that they're actually
they're moving in the direction of
supporting the repair community which I
approve of
yep it's 2012 just checking out a 15
inch dirt oh alright then I
unfortunately have no idea what the
issue with yours is
I was hoping yours was au 8900 issue
that I could help walk you through but
no all right now that we have soldered
that on but the mentality of the bigger
the JA gob the better the job we're
gonna see if it works and if it works
then we'll have Paul will approve and
Paul wrong once and for all that indeed
the bigger the gob the faster the fan
spin let's see if this works now that we
fixed it using enough flux and it
appears that it now has a fan spin and
the reason it has a fan spin is that we
use the right amount of flux let's take
a quick look at the schematic just so I
can go over this very common issue all
sister would on many of the old machines
was required in order for you to get CPU
vcore if you don't have all this power
good you will get every rail besides CPU
v core unless one of these rails is
missing of course but a lot of the times
on all says power good is missing it's
not because one of these specific rails
is missing like pp5 like these are all
the rails that you need in order for
pulses power could be present you know
p1 v8s 3p 5 vs 4 PP 1b or 5s o DD all
right et cetera a lot of the time that's
missing because the Auster's power
circuit itself has been damaged so if
you are working on an air or one of the
older retinas and it's taking 100 to 100
80 milliamps but not turning on a lot of
the times that's either a short to
ground the PP + g3 hot or be a missing
all sis power good and our losses power
good was missing because these two
resistors over here along with the pads
under them were corroded which meant
that this was not getting everything
that it needed and this transistor was
probably not allowing losses power good
to be created and that would be that now
you also do keep in mind that this stuff
see where it says is L version used for
development this is where this circuit
gets a little confusing especially on
the heirs this entire setup is not
actually here I hope so this exists this
pull-up resistor if it takes p.m. sleep
best 3 L which was required to be in an
Esso state
pulls up all says power gate that's
present these resistors that sit between
these power good signals coming from all
the chips that create those rails and
all suspected that's present this
transistor over here along with these
voltage dividers that send voltage to
the transistor this is present this
stuff over here is not present so if
you're taking 0.15 amps or 0.1 amps on a
MacBook Air or any of the a 15:02
retinas and you don't have a short to
ground on PP buzz g3 hot 99% of the
times it's gonna be a missing alsa spare
good due to either a missing rail or be
some sort of corrosion or malfunction
around the AUSA's power good circuit now
if you look at the screen the what I do
when I'm missing all says power good the
first thing I'll do is I'll go through
each individual rail that is needed so
for example here what rails do I need
for all says power good well I need PP 5
ESL 8 B 3 B 3 SL pp 1 B 5 s o PP 1 b8 s
3 PP 5 es 4 PP 1 video 5 DDR egg then if
all of those rails are present and I
still don't have all says power good or
either a the pull-up resistor that pulls
it up is missing B something is corroded
or broken in this area so for example a
bad Q 8150 if this was corroded and
destroyed will keep all says power good
from going high or C these rails are
present but the voltage divider is
between those rails and the transistor
for all says power good could be bad so
that is that and also this is why it's
really important to not be using a
standard MagSafe adapter but rather some
sort of power supply so my power supply
here that I attached a mag save to and
I'm going to include a link in the
description below to a video on how to
do this it tells me when I set it to 18
point 5 volts it tells me exactly how
many amps are being taken and by knowing
how many amps are being taken it lets me
know exactly where to look on the board
now granted on this one it was an easy
one there were two corroded resistors
and at this point in time I could
probably have this board two yards away
and see those two corroded resistors
there but if those resistors warren
corroded i would have to spend hours of
time going through every single part of
the board to figure it out and that is
not a great use of my time but if you
actually store this stuff in a
spreadsheet somewhere or
save it in your brain and then you'll
know exactly what part of the board to
look for when you see how many amps it's
taking Jessie Jones also used this when
troubleshooting iPhones she goes one
step further with it not only does she
look at how much power in the device is
drawing from a USB charger she'll also
look at the the graph so right now let's
say it's drawing point two and then
point one and point two then point one
and point two point one and she spends
three days to figure out that it's this
specific issue she'll actually graph
that and then save it and if she sees
that pattern then she'll know okay I'm
gonna look for this problem it's a great
way of speeding up the process of going
through these boards and hopefully that
worked for you and so we got a fan spin
we're gonna make some money and yeah
hope you learned something