until I know the scope of what's going
on the details and until I just hear
back from my attorney with everything
that I with with all of my questions
answered the way that I'd like them to
be answered I'm going to change a little
bit of the way that I do the videos so
do forgive me if you find the format to
be not as appealing as the old ones so
let's see if we can tell what's going on
with this MacBook Air Board over
here remember no spill no spill never a
spill okay we have this crap over here
oh no spill
right all right we have that and then oh
God and we have this that's on a TPS
51916 okay so the first thing that I
would want to do here is I would want to
open the schematic and in the schematic
I'd like to see how that works so let's
just open up a schematic over here so I
can show you what's going on okay so it
seems like that chip is U 7400 it's 1.2
volts for the RAM and it's important and
I don't like water said frowny
face what what what do you guys want
from me I can't I'm not I'm not a visual
artist I can't draw this is this this is
what you're going to have to put up with
until I'm fully uh informed and up to
date on what and on what uh the lovely
people at Kil Patrick and Townsend have
in store for me now anyway so let's uh
let's continue over
here oh man I tried man I tried I tried
what you you you want me to just give up
no anyway so I so what I would do here
so what one thing you may notice is that
the chip says TI on it which indicates
that it's probably made by Texas
Instruments and then it says
51916 now now with this indicate now
most of the Texas instrument chip sets
that you're going to find they start
with TPS so what I would do here is I
would Google TPS
51916 and see what I find and hopefully
I find a schematic that's better than
the last one CU that schematic was
sad 925 51 925 no was a different number
51916 data sheet and we're going to just
I want to get an idea of how this is put
together so let's see here we go so this
is what I'm interested in all right so
this looks
like a buck regulator with an ldo so the
whole idea here is a buck regulator is
something that's going to take a higher
power and higher voltage and turn into a
lower voltage and an ldo is something
that's going to take a a low voltage and
turn it into a slightly lower voltage so
for example like you want to turn if you
want to turn 12 volts into one Buck
converter if you want to turn like 3
volts into a 1 and a half ldo if that
makes any sense
um I've I've really oversimplified
something that deserves much more
explanation but just to get to the point
there so let's go back to our screen
over here now the main thing that I'm
interested in when it comes to this type
of circuit is the input output what I'm
expecting so it says over here V in VN
on pin 12 which is going to be 5 volts
so 5 VN let me just zoom in in case you
can't really see that too well 5 volts
in on pin
12 and I should get
well according to the schematic over
here the schematic says that it's 1.2 V
Volts for Ram so I'm expecting 1.2 volts
on output so on pin 12 I should see
input and on pin
two I should see output and I get see
because this is output and it's going
back to pin two so that it can see what
it's making whatever so let's just go
back over here and and take a look at
this area so I'm going to since we have
a DOT over here I can make jump to the
assumption that this is over here is
going to be pin two which is where uh
the output should be and then over here
somewhere up
here uh should be pin 12 which is where
input would be the problem is that looks
so bad I can't even really see anything
and if it looks that bad it probably
shouldn't be on the board itself so I'm
just going to take all that crap off all
right kicking on the air
filter
H find me a donor here we go donor
board no not the
same grab me
up
yeah I mean there are some things that I
genuinely want to share but I just don't
want to say anything
until I know where I stand but I know
that I'm getting trolled
there are just certain things that you
just don't expect to hear from certain
people and I know that in some way shape
or form that I am being trolled and that
it's going to come back to bite me in
the ass in some way that I don't
expect I'm really excited for the day
where I can freely speak about all of
this as if it was past
tense
do
gross all right so we're going to clean
this area a little bit so it's fit for
for
rework there was a hair in
there
okay scratch away at
this
scratch the thing the one thing that
kind of gets me about all of this when I
particular post from uh people who are
really a fan of apple one thing I don't
think people understand at the end of
the day for all the things I may say
about Apple support apple out of
warranty service how Apple treats
independent repair centers what I do is
keep stuff working for people that use
and love Apple
products like really I mean for all the
stuff that I say my job is pretty much
to keep things working for for people
who like Apple products
so I mean even if you don't like let's
say you know I say something about the
iPhone or the MacBook that you may not
like because that's one of the things
that I talk about as I say um you know
there are certain things that are
subjective for example like operating
system usage or features but then there
are things that are objective such as
you know what I deal with when I uh work
on the product
or objective matters like spill
resistance uh touch I see issues on the
iPhone 6 so you know when you do that's
a great one I mean when you walk into
the store the employee is literally he
he takes your phone from you and you
have a touch I see issue on an iPhone 6
he tells you we do not acknowledge the
problem and while he's saying we don't
acknowledge the problem he's saying that
out loud to you while he's bending your
phone to try to get the touch I uh back
working you know that kind of stuff is a
objective so you may think Lois you're
crapping but but I want you to think
about this because a lot of people say
that it's a jump to the negative they
they say you know you're are too
negative but but when I'm being negative
towards a negative situation that that
actually is a positive so if the company
that you love is making a product that
in some
way uh you know is designed in a manner
in which it you it lasts 12 months and
then a lot of them die and I say hey
that probably shouldn't happen and if it
does happen there should be support
available for it I don't think that's a
negative thing I'm saying a negative
thing about something that just so
happens to be
negative in the hopes that it will be
remedied and become
positive and a lot of that's the thing I
don't use these products but if I were
do I have always said if David Bowie
were coming back to life for 40 minutes
only and I got to record him doing
you've been around live before he goes
back into his grave I would not do that
on my the machine that I use here i' get
a Mac for it you know there are uses for
everything and a lot of the people who
use these Mission critical products one
of the things that would be a good
selling point to the individuals that
use these Mission critical products is
support not just first party support but
third party as
well knowing that when you're out of
warranty or when you're away from an
Apple store that you can go someplace
and they will make it work
again that's valuable to the
professional
community and it's something that we
would offer
[Music]
yeah it was one of those things where
it's like I get done with a really long
drawn out legal battle of crap and I win
and I'm
good I haven't made time I cleaned up my
whole apartment I got wire ties for all
the [ __ ] behind my TV and my stereo it's
like I got got free time man great I had
I get a call from freaking billion dooll
Law
Firm will it ever
end
okay
I wonder how many people are going
unsubscribe when they see the schematic
that I
made if you want to call that a [ __ ]
schematic a
schematic
[Music]
m
I'm going to turn that vent around so
it's not pointing at you anymore when
I'm done cuz I'm sure that that's
freezing yeah it's it's literally
blowing directly on you cuz I love
cold now we go over to this
area so what is that resistor for the
one that looks really
nasty the one right see what I'm talking
about when I say the one that looks
really nasty I should have said this
before I put flux on it but I showed you
before was that one see that with the
nasty
stuff let's see what that
was all right so it looks like that is a
resistor so it's a
35.7 kiloohm resistor uh between pp15
Soo vref and pp1 v5o FB so let's see do
we have 35 kiloohms there just check on
the
multimeter surprisingly we do but I
still don't trust it I just have a
feeling that that's going to break later
on so I'm still going to
replace if it looks like that my trust
is
low
okay we take this off
bam
and oh the iron was sleeping there for a
second all right get whoops you get this
going Focus [ __ ] there we
go bumping into this microscope camera
more and more often
lately flowing in a
place
good little resistor good boy good
resistor all
right
now time to see if we have
magic bam
baby that's and this is one of the
boards that turns on off on off on off
then finally on but as you can see it
works
yay beautiful and that's how we fix
boards in the new system until I hear
back from my attorney these are the
schematics that you guys will be dealing
with because I can't [ __ ]
draw and that's it for today