How Smartphones are Made - in China

Today we're going to see how phones are made. I'm here at the main manufacturing

made. I'm here at the main manufacturing facility of OPPO outside of Shenzhen, China, and we're going to get to see a lot of the details that go into making a state-of-the-art flagship smartphone.

I've been making uh videos about phones here in China for almost 10 years, ever since I made my own phone from parts that I bought in the markets of Hashang Bay. And so getting to see inside a real

Bay. And so getting to see inside a real smartphone factory for the first time feels like I'm coming full circle. I'm

headed to go meet the head of manufacturing and he doesn't speak that much English and I don't speak enough Mandarin. So we're going to be wearing

Mandarin. So we're going to be wearing these radio earpieces so that we can hear a professional translator doing simultaneous translation as we're talking.

Hi, I'm Scotty.

>> Awesome. I'm super excited to be here.

Thank you for sponsoring me and my team to come out here and for giving us such complete access to the factory. What are

we going to go see first?

>> Awesome. Let's go check it out.

>> Where are we right now?

Amazing.

So, three layers here. Three separate

PCBs.

>> Okay. What does the logic board do? What

does the main board do?

>> Right. So, it has the CPU. It has all of pretty much all of the integrated circuits. This one has like it has all

circuits. This one has like it has all of the connectors for like the screen.

This one has the the camera modules integrated into it. It's like the most important part of the phone, maybe.

Yeah.

What kind of efficiency? The power

efficiency.

Why is that important? Usually it's

because you end up using that space for something else, right?

Okay. So thinness. Yeah. Okay. And does

that also allow you to increase the size of the battery if you make this smaller?

>> Should.

>> Yeah. Okay. Cuz that's what everybody wants is they want their phone to last longer, but they want it to have as much features as possible. And so if you could shrink the the features, you can

add more battery.

>> Can we take apart the three layers of boards to see what's underneath? Is that

possible on this?

>> Oh wow. This is very different.

Got it.

>> This is like the connector layer like a riser almost to create space between the bottom board and the top board which then has more IC's on it. And then you solder these together to make a

sandwich.

>> Yeah. Yeah.

>> This is amazing. Why do you stack the boards like this? Why not just make one board?

So, it's it allows you to fit more in a smaller area cuz now you can put instead of one side two side of IC's, you actually have four sides of IC's in the

same space in the same XY space.

>> Great.

>> Yeah, very smart. This is super cool.

Mr. Sean's a busy guy, so he's going to head off to some meetings, but we'll catch up with him later in the final assembly process for some of the more unique things they're doing to put the phone together. In the meantime, I'm

phone together. In the meantime, I'm going to explain to you the entire SMT line. There are some R&D engineers

line. There are some R&D engineers actually right behind the camera. We've

been doing a lot of talking. They are

making sure that everything I say is correct. There are a lot of screens in

correct. There are a lot of screens in this factory, some of which have some confidential information on them. So,

I've just asked OPA to turn those screens off so we don't have to worry about it. Let's head on to the first

about it. Let's head on to the first step.

This is the very start of the SMT line for soldering the logic boards. They

start as a panel of four separate logic boards. There's a stack in here that

boards. There's a stack in here that gets loaded onto carrier trays which are just like a jig that holds the the panel of boards and is very rigid so that as

they're doing various things to the boards they don't bend or warp or anything like that. These circuit boards or or PCBs are made by a separate factory and then come here as they start

down the line to have all the components put on them. So next they come here to this little machine which they said actually cleans off any dust and surface contaminants. So the board is super

contaminants. So the board is super clean coming into the solder paste machine. The solder paste is little tiny

machine. The solder paste is little tiny microscopic balls of solder suspended in a paste almost like a silk screen process. It's a stainless steel stencil.

process. It's a stainless steel stencil.

They use a laser to to cut out tiny very precise holes for where they want to put solder and then they literally just squeegee it onto the board. And that

solder paste is where the components are going to be mounted a little bit further down the line. Then they'll melt it.

Next, they do solder paste inspection, SPI. SPI is making sure that the solder

SPI. SPI is making sure that the solder is everywhere it should be and that it is aligned precisely with the board.

They have a closed loop between their SPI machine and their solder paste stencil machine that is looking for misalignment where the stencil is

slightly misaligned with the PCB and the solder paste is being printed slightly off in one direction and it can actually automatically adjust which is mindblowing. Usually that's just dialed

mindblowing. Usually that's just dialed in by hand. So we've got SPI here. This

is an optical process. It's using uh colored lights and a camera to see exactly where the solder paste is. It's

pretty hard for us to see inside some of these machines. Because the the covers

these machines. Because the the covers are so dark and we're not able to open them while they're operating. Next, this

is a buffer. It will remove and store any panels that have errors in the solder paste inspection and hold them off to the side for NG. No good. Next,

we get into the pick and place machine.

So this is really like one of the key pieces of the whole process. This is

where all of the parts are put on the board and they're all loaded off these reels. So they start from the smallest

reels. So they start from the smallest component which is also the fastest machine. I believe Mr. Sean said they

machine. I believe Mr. Sean said they can place these two per second and there are tiny tiny components on here.

So 015 components >> which is like just so you understand 015

is a component that is so small it is very hard to manipulate with tweezers by a human even under a microscope. It is

microscopically small. It's a little bit bigger than a hair. It is so so small. I

can barely see some of these with my eyes. Uh, and you can place them very

eyes. Uh, and you can place them very very precisely. Oh, you have some.

very precisely. Oh, you have some.

>> Oh my god.

>> It like fits in the in the groove of my fingertip of my uh fingerprint. These

machines are exceptionally hard to see into. Normally, when we see a pick and

into. Normally, when we see a pick and place on an SMT line, it's a it's a bigger open frame and you can see inside. We're actually going to show

inside. We're actually going to show some footage of that from a previous factory that we've been to. They start

from the smallest one and they're picking it up with a a little suction needle. They're using cameras for

needle. They're using cameras for alignment to figure out precisely exactly where the board is, but also precisely where the component is to go pick it up, but also once they pick it up to get the exact positioning of where

it is on the needle tip. Yeah, we're

getting into much bigger components now.

Stuff that I can actually see with my eye. The last machine is where they're

eye. The last machine is where they're placing the larger IC's. So like the processor, the bassband chip. This is

also the more expensive components, the stuff we start at the beginning. It's

like tiny resistors and capacitors. Now

we're getting into like actual dollars per component or more. Then we're

getting into another visual inspection machine. So this is a uh AOI, automatic

machine. So this is a uh AOI, automatic optical inspection machine. It's using a camera and a light and it's looking for where each individual component is and

making sure that it wasn't misplaced, that it's not standing up, that there aren't any missing components. Like the

the pick and place machine failed to pick one up and thought it put it down but it didn't. Next is another set of pick and place machines and these are putting on various metal shields that go

over components that they want to have already inspected. And then we get to

already inspected. And then we get to that stacking board. And this amazes me because they're using a pick and place machine to place that. I've never seen

anything nearly this big being picked up by a pick and place machine. I asked

them to provide me the custom suction head they use to pick up this part. This

has three separate suction heads and they have designed this together with the part so that it can come in and correctly pick it up and place it. And

of course, this thing has to be super super accurate. I've actually got an

super accurate. I've actually got an example. One of those top boards. It

example. One of those top boards. It

comes in like this.

That is quite cool. Talk about detailed.

I wonder how many people it took to perfect this and design this custom thing. Next, they're putting a jig on

thing. Next, they're putting a jig on top of the stacked boards. It holds it in place and applies a little bit of pressure as it goes into the reflow

oven. So, the reflow oven is what

oven. So, the reflow oven is what actually melts the solder. And this

one's special. This one is purged with nitrogen to push out all of the oxygen.

There's only a tiny tiny bit of oxygen in there. And that's to make sure that

in there. And that's to make sure that none of either the board, the parts, or the solder gets oxidized during the reflow process. So reflow ovens

reflow process. So reflow ovens typically they they have different zones along the reflow oven. So it goes from all the way here all the way to the end of this this metal machine. And it's

sort of like a conveyor belt toaster oven you see at the at the hotel for running your toast through. But it's got a bunch of different heat zones. It'll

start out at a really pretty low temperature and it'll bring it up to just below the temperature that the solder will melt at and then right at the end it spikes it up above the

temperature needed to melt the solder and then brings it back down pretty quickly. The reason for that is that

quickly. The reason for that is that some of the components are pretty sensitive to temperature and you don't want to leave them at the high temperature for very long. This machine

then removes that top fixture and we go into another AOI machine, the automatic optical inspection to do kind of the same checks that we did on the previous one. Are the components all in the right

one. Are the components all in the right place? Are any tombstoning where they

place? Are any tombstoning where they stand up on end and look like a tombstone in a graveyard? Is anything

missing? Are there any connections between two solder pads that shouldn't be connected that's going to cause a short? The previous one was making sure

short? The previous one was making sure that the pick and place process was correct, but this one is making sure that nothing changed during the reflow process when the solder started melting.

And again, like we've had before, every time we have an inspection machine, we have a NG buffer which removes those no good boards and puts them off to the side when they hit them. They have a

99.8% acceptance rate, which means their failures are below. 2%. which is that is next level. There's something I haven't

next level. There's something I haven't really been explaining thus far, which is that this SMT line is actually doing both the top side of the board and the bottom side of the board. This front

line here is the bottom side, and this robot is coming and picking up the carrier tray of all of the boards that have just the the top side finished, and it will bring it back to the beginning

of the line. The boards on the far side are the ones that have had the bottom side done and that stacked board put on top and they need to continue on down the line. So they go through this bridge

the line. So they go through this bridge here with an elevator that lifts it up over the top. And the problem this is solving is that the robots need to be able to get through. So it goes up over

and then down and continues on down the line. Next, they're preparing the boards

line. Next, they're preparing the boards to be cut out of that panel. So there's

four boards to a panel. We're going to separate them. So, it's taking it off

separate them. So, it's taking it off the carrier tray that was used for soldering and going through the reflow oven, and it's putting it on another carrier tray, but this time for this

daneling machine, which is really just a CNC router that's cutting around the outline of the PCB with a little uh milling bit, like a like a drill bit, basically. It's got it on the carrier

basically. It's got it on the carrier tray. It's got a top plate on top, and

tray. It's got a top plate on top, and that's just to hold everything in place, make sure it doesn't get damaged. But

you could see the head coming in and doing the cutting. By the time the boards come out of there, they're still in the orientation of the four boards from the panel, but they're individual.

So, there's a a suction head that's just lifting them from there onto yet another carrier tray design. And this carrier tray is specifically for testing. So,

these big round machines with the the robot arm in the middle. These are

picking those boards up and putting them in various test fixtures. This first

machine is loading the software onto the phone, right? So this is the operating

phone, right? So this is the operating system that the user sees, but first they're putting it into a test mode so that they can run a whole bunch of different tests that use software both

on the logic board and all of this machinery, all of these pieces of test equipment. Once the software is loaded,

equipment. Once the software is loaded, it comes here to uh two separate calibration tests. It's calibrating all

calibration tests. It's calibrating all of the different radios on the phone.

So, cellular, Wi-Fi, Bluetooth, and so on. Making sure that the signal

on. Making sure that the signal strengths that are coming out are correct, frequencies are coming out are correct. This comprehensive test is then

correct. This comprehensive test is then testing that those radios are operating properly, they were calibrated properly.

It's also testing a bunch of other functionality on the board, making sure the chips are working properly. This is

specifically testing Wi-Fi. And then

lastly, they call this their electricity test. It's testing current on the board,

test. It's testing current on the board, how much current is flowing through different parts of the board. And this

is an electrical test to kind of reverify what happened at the AOI, the automatic optical inspection, to make sure there are no shorts between solder pads, or that there are no components

that are bad for some reason and are using more power than they should. And

this really helps ensure the life of the phone. So, yet again, we're switching

phone. So, yet again, we're switching carrier trays from the testing carrier tray now to a carrier tray to do adhesives. And this is the last one.

adhesives. And this is the last one.

This here is an oven to bake out any moisture that's gotten into the board since the start of the line. The testing

takes a while. Sometimes the line gets paused. You really want to make sure the

paused. You really want to make sure the board's as dry as possible before you start putting on adhesives. Here is the start of the adhesive line. First, we're

starting with an encapsulation. Not

quite an a conformal coat, but it's a it's a covering, and it's providing waterproofing, and it's help holding smaller chips in place. Further down,

they're doing underfill for the bigger chips like the CPU and the bassband chip. They have little tiny solder pads

chip. They have little tiny solder pads underneath as like a grid underneath the chip. It's pretty easy for those to get

chip. It's pretty easy for those to get damaged if the phone drops. It's

possible for those solder pads either to rip off the PCB itself or to break that solder joint. And so the underfill is a

solder joint. And so the underfill is a like an epoxy, a glue that they put alongside the chip and it flows underneath and it just holds that BGA

chip down to protect the the solder balls. This dramatically helps the

balls. This dramatically helps the quality of the phone in adverse conditions, but it also makes the life of repair people hard. The repair techs have all sorts of special techniques to

try and deal with the underfill because it can be so strong holding that that CPU on. and then comes here to a UV

CPU on. and then comes here to a UV light that starts to activate that glue and then into a curing oven. And this is very similar to the reflow oven that uh melts the solder. One of the things I've

noticed here is how automated this is.

There are no spots on the entire line where there's a human touching every single board. They have five people per

single board. They have five people per line and they're really only here to load more components and then deal with any issues that that come up on the line. They've got everything handled by

line. They've got everything handled by the automated machines and the robots that are moving stuff around. Super

cool. How many PCBs can one SMT line produce in a day?

>> 400 an hour. Wow. And do you run 24 hours a day?

>> Oh my god.

>> And then the last stage of dispensing is for thermal paste. There's two separate pieces here. one is dispensing it on top

pieces here. one is dispensing it on top of the CPU and the bassband chips which use the most power in the phone and can get quite hot. So they want a way to dissipate that heat and the thermal

paste provides a layer of conductivity, heat conductivity to draw that heat out of the chips and into other parts of the phone so that it can it can dissipate.

This part is wild. I didn't even know this existed when you sandwich those two boards together. So you've got that

boards together. So you've got that stack up of three boards. You've got the two outer boards and then you've got a cavity in between them. They're putting

thermal paste inside that cavity. So,

they're injecting it like you would inject like a jelly donut. They've got a a nozzle that comes in and there's a hole and they're squirting it in there so that they can get good thermal

conductivity around the chips on the inside of the sandwich. Mind-blowing.

And then finally, here is the auxiliary pieces. So, it's little stickers and

pieces. So, it's little stickers and foil covers. Some of these are for like

foil covers. Some of these are for like RF shielding, little pieces of foam to protect things. This is where you get

protect things. This is where you get into like the really fine details. I've

been joking with the engineer that they're making the boards pretty by putting stickers on them. It's not for that. And then finally, they go into

that. And then finally, they go into these plastic carriers to be sent over to the final assembly line. So, let's

head over there and see how they assemble the entire phone.

Got to watch out for robots here.

So, where are we now?

And you guys are doing something very special on this model for the screen.

This screen has a very thin bezel around the outside. It's very, very close to

the outside. It's very, very close to the edge.

Oh my god, that's so thin.

>> So, you mentioned COP. It's a basic technology for screen manufacturing. A

lot of screens are made this way. So we

have the screen itself here, right? And

the OLED. What is this part here?

Yeah, got it. And all of this is on FPC board,

got it. And all of this is on FPC board, right? Which is a flexible circuit

right? Which is a flexible circuit board. So it's attached to a flexible

board. So it's attached to a flexible circuit board. And then that board, how

circuit board. And then that board, how does that attach to the screen?

Now you're doing something very special here to protect a problem that happens in screen sometimes and is even more a risk because of the thin edge. Right?

There's a problem here where this can get broken if you drop the phone on that on that bend. Right?

So basically, it's like an injection molding process that goes over the top of the edge of the screen with a plastic. You're getting it all through

plastic. You're getting it all through the cable to protect that cable inside sort of a plastic case that you're building.

>> Oh, under the vacuum. Okay. Okay. And

then that sucks it into the middle. Got

it. Okay. That is super cool. This is so smart.

>> Yeah. Awesome. You guys are doing so many little things. This is so cool.

We're going to let Mr. Shawn go off to some meetings, but we're going to dive into the final assembly process here.

This is the first step of the screens coming into the assembly process.

They're just checking in the barcodes.

She's doing visual inspection, making sure there's no cracks or dust or anything. Over on this side, they're

anything. Over on this side, they're bringing in the mid-frame here, the case of the phone. They're installing the snap key, which is a touch sensitive button for the camera. So, it's the the trigger button for the camera, but also

you can slide your finger on it to switch modes and which camera and things like that. So, now we've got the two

like that. So, now we've got the two lines here running together. We've got

screens on this side, mid-frames on this side, the body of the phone. He's

applying a little protective piece of plastic to the bottom part of the screen and loading it into this machine, which applies glue very precisely around the outer edge of the screen so it can be

mated with the mid-frame a little bit further down the line. The screens then come here where they're blasting them with plasma, which is wild. I've heard

of this before. I've never actually seen it. Plasma is super high voltage.

it. Plasma is super high voltage.

They're also using a blast of nitrogen to blast it out. It's often what you see around super high voltage like lightning. I have heard, but now we're

lightning. I have heard, but now we're seeing that plasma, if you blast a surface with plasma, it actually makes glue stick better. So, they're actually blasting the glue that they put on in

the previous step to activate it and make it stick really, really well to that mid-frame. They also said it has

that mid-frame. They also said it has the nice side benefit of blowing away any dust and other particulate from the screen to make it super clean for when they're going to mate it with the midframe. And the reason they're so

midframe. And the reason they're so particular about this is they want it to be as waterproof as possible. So, you

really want that seal to be super strong and to not have any contaminants in it all the way around. This is one of the weirder jobs in this factory. And this

guy isn't locked in the box because he's been bad or anything. This is actually like a little miniature clean room.

They've got an air filter on top. He's

got an ionizing air blower here.

Actually, a lot of the stations have these. His job's relatively trivial.

these. His job's relatively trivial.

He's taking a sticker off the hole where the front camera goes on the front of the screen. They're putting in here cuz

the screen. They're putting in here cuz they don't want any dust to get in between the front camera and the front of the screen or the back side of the screen cuz it would show up on the front

camera. And so he's removing it,

camera. And so he's removing it, sticking it into this machine, and they're just doing it in a very clean environment. So, this is quite like a a

environment. So, this is quite like a a complex setup for something that's very simple, but it's to make sure that every single phone is perfect. So, this

machine is where the screen and the midframe come together. They're actually

doing something a little bit complicated here. Rather than just pressing it

here. Rather than just pressing it straight on, there's actually a little bit of a curve on the bottom side of the the bottom edge of the mid-frame. And so

they're taking the bottom edge of the screen and slotting it in at an angle and then tilting it down rather than just putting it straight on. It would

destroy that bottom edge of the screen.

It's all about the details. Here on the far side there, they're using a laser scanner to scan in three dimensions the mid-frame so they know exactly where it

is so they can slide that screen in just perfectly. The robot arm now takes the

perfectly. The robot arm now takes the mid-frame and screen and is loading them in a jig, like a top and bottom jig.

that's pressing them together and it's stored back in the machine here to let that glue cure for 3 hours. And then the suction cups here unload it at the end of the 3 hours and send it on down the line. Here they're testing to see

line. Here they're testing to see whether that bond between the mid-frame and the screen is actually watertight.

This model of phone is not only IP68, which is waterproof to 30 ft, it's actually IP69, which is the first time I've seen this on any phone. Nine is

high pressure water jets with hot water, not just room temperature water. Now,

how do you test if a phone is waterproof for every single phone without destroying it? You don't want to dunk

destroying it? You don't want to dunk everyone in water. Well, if it's airtight, then it's also waterproof. So,

they've got this machine that squeezes this jig down and it seals the back side of the phone, the other side, from the screen. And then they essentially

screen. And then they essentially inflate it with compressed air. And if

no air leaks out, then they know that that screen and mid-frame bond is going to be waterproof. This guy's job here is to put in the actual logic board, the motherboard of the phone. It starts with

this machine putting down some glue and then he puts in the the board. And then

this machine here is an automatic screw machine. It puts in just one screw that

machine. It puts in just one screw that holds the board in place. And then

further down the line, they put in a bunch more screws. Now they're adding all the various other parts inside the phone. So, this guy here is adding the

phone. So, this guy here is adding the bottom circuit board that has charging port on it. I think it has like the speaker, microphone, things like that.

Down here, they're actually putting in the cable that goes between that bottom board and motherboard. And there's a lot of presses here. So, what's interesting is when you repair a phone, you just

push that connector down by yourself.

But every single time they attach a connector, there's a machine that pushes it down and make sure that it's exactly the right pressure. This is an antenna cable that's getting pushed in. And

there's actually two pins that are coming down and compressing each side, pushing it into the socket. Here we're

doing one of the back cameras. And here

is a second one of the back cameras.

This side here is the line preparing the telephoto camera to go in the in in the phone. And this is super interesting

phone. And this is super interesting there. This is a periscope module. So

there. This is a periscope module. So

they actually bounce the image from the lens here to the sensor which is way down at the bottom. And that's to create more space, more distance between the

lens and the image sensor, which is just that blows me away. So, next we're putting the speaker in the bottom part of the phone above that bottom board

that has the the charging port. Plugging

in cables, lots of plugging in cables with cable pressing machines. They're

putting the macro camera in now, which is this little uh yellow ringed camera.

And then here is a much bigger screw machine. And they're starting to put

machine. And they're starting to put screws in that bottom end of the phone around the charging port and the and the speaker. Screws here all camera aligned.

speaker. Screws here all camera aligned.

This is very cool. There's a screen I can't show you that shows how it's aligning. So, it uses a camera to align

aligning. So, it uses a camera to align off of a screw hole on the case to know exactly where the phone is. And then

it's also using a camera to pick up the screw exactly. And then here they're

screw exactly. And then here they're actually doing some electrical testing.

So, this is the first electrical test on the line, and they're testing current.

So, they're making sure there are no shorts in any of the the things that have been installed thus far, and making sure it's not using too much power. And

now we're heading into battery land. So,

this machine is installing protective foam that protects the battery from hitting the edges of the phone, anything that would cause the the battery be damaged when it's dropped or something

like that. And here's where the battery

like that. And here's where the battery is actually being put into the phone.

He's just putting them in by hand. And

then this machine is pressing them down to make sure that the glue that holds the battery in is is well adhered. And

then these three machines, one, two, three, are inserting all of the screws into the motherboard. The logic bar, that like top half of the phone, each machine is doing a different set of

screws. In this area, these three

screws. In this area, these three machines are applying glue in preparation to put the back on the phone. We're getting to the end of the

phone. We're getting to the end of the assembly process. There's a large clean

assembly process. There's a large clean room here that has I don't know 10 15 guys in it. And there's two sides of the line. In front here is the phones and in

line. In front here is the phones and in the back is that back cover. They're

doing a lot of cleaning and inspecting the the camera lenses and making sure there's no dust in anything. As we move down here, this guy is taking the phone

and the back and this machine is picking them up and pressing them together.

Doing some final testing here, final inspection. We get higher pressure now

inspection. We get higher pressure now to start to activate that glue. And then

finally, like we saw on the screen, they go into a press for an hour. Same deal

where they've got a fixture top and bottom. It clips on. It goes into this

bottom. It clips on. It goes into this big stackup back here for an hour and then they pull it out at the end. And by

the time it comes out here, we've essentially got a finished phone, but there's still a lot of work to do. This

whole side here, everything we've walked down thus far, this side is just as long. And we get into testing and

long. And we get into testing and packing. One of the most important tests

packing. One of the most important tests that they do is the burn-in process. So,

the phones come into these cabinets and they get plugged in for 8 hours. And all

sorts of things are going on. The

screens are turning different colors.

They're charging off of here. They're

making sure that as the phone is running for the eight hours that no problems crop up. The initial first hours that

crop up. The initial first hours that any device is being used is the most likely time that you're going to have problems. And they want to make sure that it happens here in the factory and not the first few hours that someone

gets their brand new phone. And there's

a ton of these cabinets that are all doing aging down the line. Here we got vibration testing here. This thing's

doing visual inspection on the cameras, so the space between the camera and the the outer glass to make sure there are no little specks of dust, little hairs, pieces of lint, anything like that.

They've got testing software running on the phone, so every phone now has like a QR code and debug information, information about the phone, so they can track it through the rest of the

process. These machines

process. These machines are pretty cool. So, we talked about that snap key button and they've got a quick action button as well that's that's got that pressure sensitivity.

And this machine is simulating a finger and it's tapping on five different pressure points along those buttons to make sure that they're sensitive along the whole length of the button. So,

they've essentially got like a little probe that's coming in there and simulating a finger. Then, we get into real testing land. So, there's a huge row of machines that go down this way.

So, this one is testing the flashlight.

And they've all got they've got little test jigs in here. It looks like this one can accommodate four phones at a time. Kind of pick them up, put them

time. Kind of pick them up, put them down, do the test. This one is doing SIM card insertion. So, they have like a a

card insertion. So, they have like a a simulated SIM card that gets stuck in the slot, making sure they can read the SIM card. Down here is wireless

SIM card. Down here is wireless charging. So, as we go down the line

charging. So, as we go down the line here, we're starting to do camera tests and calibration, optical sensors. This

is quite cool. They're calibrating the vibration motor. This is for the OIS for

vibration motor. This is for the OIS for the cameras. So, optical image

the cameras. So, optical image stabilization. It's where the camera is

stabilization. It's where the camera is actually moving the sensor to compensate for shaking the phone. They've got two of them, one for each of the the cameras

that has OIS.

So, Mr. Sean, what part of the process are we at now?

children.

Okay, once it's fully assembled, what is Mura and why are we correcting it?

If I understand correctly, the issue with mirror is that when you have an OLED screen, not all the pixels are the same brightness or the same color. And

so you might have a color shift across the screen where it's one color up here and it's one color down here or you have a brightness shift across the screen. Is

that is that right?

>> And then demura is the process of correcting for that in the IC. Is that

is that right?

>> So when we talk about doing the G mirror when this is a white screen that it's the even whiteness across the whole screen, same brightness, same color.

>> And so how does this process work? Like

you have this machine that that we can't see very much inside. What's going on inside it?

Got it. Okay. And so basically inside of here there's like a fancy camera that can see every single little pixel.

>> Got it. Okay. So it's maybe almost like a microscope camera that can look individually at every pixel.

>> Got it. Okay. And then you can just balance the brightness. When you tell a pixel to be a certain brightness, you might make it a little bit more or a little bit less than other pixels.

>> That's awesome. This is very cool. Yeah.

Yeah. Very cool. Awesome. We're at the final stage of the process, packing.

We're inside the packing clean room to make sure that no dust or lint or anything ends up in the packaging. The

first step here is removing the test software. It turns out they only load

software. It turns out they only load the very base of the operating system over on the SMT line here. Here they're

putting the rest of the operating system on apps and things like that. They're

leaving the configuration though from all of the calibration that's happened up until now. Then it comes here and there's three steps of inspection. So

this one's inspecting that the sticker that's on it that has an IMEI number which is like the the serial number of the phone that the sticker IMDI matches what's actually programmed into the

phone. This one's doing some software

phone. This one's doing some software tests making sure the versions of the software and everything is right. And

then this one is checking that sticker again, making sure that the uh the model of the phone is on there correctly, the camera lenses are all there, that the buttons are all there, just doing those

last visual inspections before the phone gets packed in a box. This is where they start putting the phones in the actual packaging. So the boxes from the box

packaging. So the boxes from the box factory are here, and they're starting to put the various accessories in. So,

silicone phone cases, a SIM card remover tool, charging cables here, and then this is the moment that that phone gets placed in the box. Manuals

get stuck in here, and he closes the box. And then it gets shrink wrapped and

box. And then it gets shrink wrapped and runs through an oven to shrink the shrink wrap onto the box, make it all nice and tight. And then finally down

here, they do one last visual inspection of the box itself to make sure that it's the right box, that it looks good, everything's where it should be, and then he scans the barcode and sticks it

in a cardboard box with a whole bunch of other boxes. And finally, the finished

other boxes. And finally, the finished box gets put in a cardboard box to be sent out either to a retail store or to the warehouse. And this is what you end

the warehouse. And this is what you end up buying. There it is, the Find X9 Pro.

up buying. There it is, the Find X9 Pro.

I'm blown away by seeing this entire manufacturing process. There are just so

manufacturing process. There are just so many details that go into making a quality phone like this. So cool.

Thank you so much for having me. This is

just incredible to get to see. Thank

you.

>> I wanted to thank OPPPO once again for sponsoring this video. I was just blown away by everything that goes into making one of their phones and how much attention to detail you have to have. If

you'd like to learn more about their phones or buy one of your own, click on the link down in the description to go to the Oppo website. I'll see you again soon.