Lensrentals’ Canon 5D Mk IV Teardown

Published September 9, 2016
Courtesy Canon USA

Courtesy Canon USA, 2016, 2016


Today the Canon 5D Mk IV cameras are out and I’m sure by this afternoon there will be unboxing videos all over YouTube. Aaron and I decided to do an unboxing post, too. By unboxing, of course, we mean taking it apart. If you want to make comparisons, you can look at our old (2012) 5D Mk III teardown or the fairly recent 5Ds teardown.

The lawyers would like me to mention that even though we (often) make this look incredibly easy and fun, you should not do this yourself. If you leave a small leak during reassembly, then when you put the battery back in the smoke leaks out of the camera. It’s important to keep the smoke inside the camera. Trust us on this, for we have experience. Every time we’ve let the smoke get out of a camera, it never works again. And your warranty will be null and void.


To be blunt, we didn’t expect a lot of surprises inside the Canon 5D Mark IV. From the outside, it looks just like the Canon 5Ds and Canon 5Dsr, which look a lot like the Canon 5D III. We expected to find some new chips inside, because, well, the camera does some new stuff that should need some new chips. And, of course, as with every camera ever made throughout history, this one has ‘improved weather sealing’. It’s not improved enough for the warranty to cover water damage, of course, but still, that’s worth a look. If nothing else, we usually enjoy opening up Canon cameras because the engineering is always nicely laid out and usually pretty. And we’re the kind of guys that value inner beauty.

So lets take some screws out!!!

Getting the Case Off

This was the first surprise we had and it goes on through the whole disassembly. Until now Canon cameras have all been pretty straightforward in their disassembly: you take out screws, that part of the case comes off, repeat for another part of the case. This time, we did the usual first step, removing the cover of the I/O ports., 2016, 2016

But it didn’t slide out. Next, out come the bottom plate screws., 2016, 2016

It loosened, but it wouldn’t come out either. Peeled back the grips and went to work on the front plate. No joy again. The various plates all loosened but wouldn’t come off. And when you’re disassembling a camera for the first time, you don’t pull on stuck things because you don’t know what they may be stuck to inside., 2016, 2016

Finally, we did take off the one thing that came off in the usual fashion; the back cover assembly. Canon techs are reading this and laughing their butts off by now, I’m sure., 2016, 2016


After we looked around a bit we realized that basically to take off any part of the shell, other than the back assembly, you had to take off most of the shell because Canon has added lots of plastic pegs and latches to the various parts of the shell, making it much more interlocking than in previous cameras., 2016

Pegs under the I/O cover plate., 2016, 2016

Interlocking latches around the bottom plate., 2016


What does this do? Well, it certainly would strengthen the shell, making it more resistant to bangs and drops. It might, (I can’t say for certain), make the seals between the various parts tighter and more water resistant. From my point of view, (but not any of yours), it’s going to make it more difficult and time-consuming to work on this camera, but not hugely so.

Speaking of water resistance we did see, like we did with the Canon 7DII and Canon 5Ds, lots of foamed seals along doors and joints.

doorseal, 2016, 2016

Even the inside of buttons has very thick rubber gaskets everywhere you might look., 2016, 2016


This next part might be useful to you, though. There was only one area where we didn’t see any seal except plastic-on-plastic. This was in the top right corner where the back plate and top plate come together. Between the two red lines, there’s just a plastic to plastic seal with no gaskets. This may be completely watertight because of pressure between the two shell plates. But I might put a bit of tape over it if I was going out in the rain. (OK, as you all know I don’t take cameras out in the rain without plastic covers. Because we write off ‘weather resistant’ cameras for water damage every week. But I know you young people live life in the fast lane and like to take risks.), 2016, 2016


OK, Let’s Look at the Insides

I mentioned earlier that we had the back cover off. Inside it looks very much like other Canon back covers.  There are aluminum shields over the button panel and LCD. The flexes running to and fro over the LCD are more complex than other Canons because of the extra processing for the touch screen., 2016, 2016


We took the back assembly apart a bit and you can see the button panel is similar to other 5 Series cameras, with the addition of the new focus select button added. It’s one of the two small, round, copper plates below (to the right in the picture) the tilt button., 2016, 2016


Once all the connecting flexes have been removed we could slide off the large, stiff, main LCD flex, which really is a circuit board almost., 2016, 2016


And now we see the LCD. Well mostly the aluminum shield/brace over the LCD with a little window with tape showing the LCD. Again we saw nice rubber seals all around the LCD panel. We didn’t remove it because we don’t yet have replacement double sided tape to make sure it stuck down properly, but other than the extra connections of the touch-screen, it was similar to what we’d seen before., 2016, 2016


Turning back to the rest of the camera, we see a couple of interesting things on the back of the camera. First, there are more flexes connecting to the main PCB than most other models. Second, we were very pleased to see a thick, stiff, sheet of rubber covering the back of the PCB (it’s actually very shiny black; the lights give it that gray and blue appearance). Underneath it, you can see the aluminum shielding and protecting panel that covers chips on the grip side of the PCB., 2016, 2016


You can get a better idea of how much nicer this is than the old foamed-tape flimsy thing that we dealt with in the Canon 5DIII in the picture below., 2016, 2016


With the back, bottom, and front plates loose, we could now take the I/O cover panel off at this point and you can see the various ports., 2016, 2016


Here was our first real disappointment. Skipping ahead for clarity, the USB and HDMI ports are soldered to the main PCB. Only the flash sync and audio ports are on a separate board. This means (as often happens) when a USB or HDMI cable gets jerked hard the port can get pulled off it’s solders to the board. The repair, in this case, is a complete main board replacement. We’d much rather see these ports on a sub-board, but understand this is a lot cheaper to manufacture this way. Almost every SLR made does this, but I sure wish they’d brace the ports or something., 2016, 2016


The CF card door came off next. Usually, this just requires removing the screws and the door slides off, you just have to be careful not to mess up the door position sensor. In this camera, though, there’s a flex right under the door that wanted to stick as we removed it. No harm was done, just another case of this camera being a bit tougher to disassemble than most., 2016, 2016


We next took the front cover off. This was a lot more complex than it would seem because Canon runs some connecting cables from the front cover, around the side of the camera, to the back PCB. This is one of those ‘why you don’t do it yourself’ moments. One good tug and some important parts would never work again., 2016

The flex that Aaron is removing tape from, and the small white wire at the bottom, run from the front cover, across the I/O ports, to the PCB in the rear., 2016


But once those were unhooked, the front slide right off., 2016, 2016


And now we have a nice look at the front of the camera., 2016, 2016


That’s the mirror motor over there under the EOS on the left side. Here’s a closer look., 2016, 2016


Finally we were able to remove the top assembly. From underneath, it looks pretty much like every other top assembly, and we’ve learned from long, painful experience not to take these apart unless we absolutely need to. In general, if something is wrong with the top assembly, you just replace the top assembly.



With the top off we have a nice view looking down onto the pentaprism. Again, we don’t disassemble these and further. There’s a lot of alignment and calibrating that needs to be done if you do. And no, I have no idea what the writing or initials are for., 2016, 2016


OK, let’s get back to the main part of the camera. After taking out some screws we can pull up the aluminum and rubber sheet shields in one piece, exposing the PCB., 2016, 2016


There are a lot, a whole lot, of flexes connected to the board from every direction. They are thicker and more complex than previous cameras and a lot end up in thick ‘press in’ connectors instead of simple flex cables., 2016, 2016


Basically, there was a lot of unhooking of connections and a few screws to remove before we could take the main PCB out. There was also a very large connector mounting from under the board that you can see here, just above the SD card. The SD card reader, as is usually the case, is soldered to the board. There wasn’t anything else very interesting on the underside of the board., 2016, 2016


Underneath where the PCB was we now see the circuit board of the image sensor, and to the right of that the CF card assembly. You can see reflections from the clear plastic shield over the sensor circuit board., 2016, 2016


If you look closer at the sensor assembly you see three special screws, one on either side of the viewfinder, one at the bottom.  These are the adjustment screws used to level the sensor so that it’s in exactly the same plane as the lens mount., 2016, 2016


You can see from this not-so-great side view that it’s a simple screw-over-spring tension adjustment., 2016, 2016


The next thing we wanted to do was remove the CF card assembly. Bent CF pins happen with some frequency and this is a common repair. We’d already seen that just disassembling the camera enough to expose them was going to be a chore. Removing the CF assembly actually ended up being more of a chore. Usually at this point removing the CF assembly is just taking out a couple of screws and unhooking a flex (the CF card door was removed earlier). In this case, we had to remove the battery door lock plate first., 2016, 2016


And then could remove the CF assembly. Once it was out we saw why we had to remove the door lock: the CF assembly also contains the battery-door-closed sensor (in front of Aaron’s thumb). Not a big deal, just different, and well, we do replace CF assemblies a fair amount., 2016, 2016


The last piece we took off was the bottom plate, just because we wanted to see how strong it looked. I should note even the tripod ring has a nice rubber seal around it., 2016, 2016


And when the plate comes off it’s quite thick and sturdy as you can see. A lot of cameras have really thin metal plates here.

bottom-plate, 2016


Now looking under the camera we can see the DC boards and other power boards, but not a lot more of interest. We really saw no reason to disassemble the mirror box and take off the battery compartment so we decided to quit while we were ahead., 2016, 2016

So What All Did We Learn Today?

Well, let’s see. The weather sealing on the Canon 5d Mark IV appears pretty robust, although you know my opinion on weather sealing in general. The shell of the camera has an interlocking construction with lots of pins and clips and more screws than previous Canon cameras. This makes it kind of a pain to get into, but I’m sure it adds to the shell’s overall strength. It might make it more weather resistant if the parts are held together more tightly, but I couldn’t say for certain.

There are more chips, and more and heavier connectors moving electrons from board to board than even the Canon 5Ds cameras have. This kind of makes sense because there’s lots of new stuff in here: a touch screen LCD, dual-pixel technology, WiFi, GPS, the list goes on. One thing that didn’t really come across in the pictures, though, is there’s more air inside this camera than we’re used to seeing. There are some empty spaces that aren’t packed full of electronics. In other words, this camera probably could have been a bit smaller but Canon wanted to keep the form factor the same.

Construction is at least as robust as the recent 5 series releases and better than the Canon 5DIII, which is as it should be. There’s a little more complexity with cables running hither and yon more than in previous Canon cameras, but that isn’t going to affect operations at all. It may make repairs a bit more difficult. And I’m, as I always am, disappointed to see HDMI and USB ports soldered onto the main PCB. They get torn off a fair amount on every camera that’s made this way (which is most cameras that aren’t dedicated for video). On the other hand, the main PCB replacement may not be much more expensive than a sub-board replacement.

So overall, it was an interesting disassembly with a fair amount of new quirks and tweaks, rather than the rather straightforward upgrade I was expecting.


Roger Cicala and Aaron Closz

September, 2016


Because people still insist on asking or speculating: Yes the camera is reassembled. Yes, it’s working just fine. No, it won’t go out on rental this week, we’re having some of the guys here shoot with it while they do their own write-ups about actually using it. But it will be rented after that.

Author: Roger Cicala

I’m Roger and I am the founder of Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.

Posted in Equipment
  • Dan Farmer

    If you leave a small leak during reassembly, then when you put the battery back in the smoke leaks out of the camera and it will never work again. Is that a joke? What smoke? I need to partially take apart my camera to dry it out due to water damage.

  • Martin Davies

    If I only want to replace the top cover, does the back and sides still have to come off?

  • Leonardo Gomes

    Hey there. I just drop my 5d mkIV. The dial is hard to move, so the power button. You think that I will need to change the whole top part? Do you think that the weather selling can loose the effective if it is open? (I will do in a Canon Service repair, of course) thanks!!

  • To be blunt, we didn’t expect a lot of surprises inside the Canon 5D Mark IV. From the outside, it looks just like the Canon 5Ds and Canon 5Dsr, which look a lot like the Canon 5D III. We expected to find some new chips inside, because, well, the camera does some new stuff that should need some new chips. And, of course, as with every camera ever made throughout history, this one has ‘improved weather sealing’. It’s not improved enough for the warranty to cover water damage, of course, but still, that’s worth a look. If nothing else, we usually enjoy opening up Canon cameras because the engineering is always nicely laid out and usually pretty. And we’re the kind of guys that value inner beauty.

  • Arhire Adrian

    It’s a stainless steel skeleton with a magnesium alloy body. I don’t think those Nikons use plastic either, and if they do it’s just for parts of the shell.
    On a related note, i’ve disassembled an old Canon SLR that had a plastic shell and steel skeleton. The mount was screwed in to the mirror box which was a stainless steel construction.

  • Michael Pistono

    Is the lens mount screwed down into plastic like the D810 and D750? It’s kind of hard to tell if the mirror box is constructed from metal!

  • pest

    It is possible to get the signal fine through connectors and cables with a good design but it’s more difficult.

  • pest

    I think it’s not the distance. It’s more about avoiding transition points (connectors) and holding the signal all the way into the specs. Take a look at HDMI design guidelines.

  • pest

    It’s possible to do more with less parts. You have to study every single chip and PCB and check this with global body functionality. It’s possible too Sony has some adventages building smaller or higher integrated HW over Canon.

  • Canon dUSA

    Yes, it is a 5d IV. Take a look at the microphone on a 5D III. It is right above the “5D” text.

    On the 5D IV, the “EOS” is not in the same piece of plastic as the “5D Mark IV” is in. (On the 5D III, “Mark III” is on the very bottom of the camera). And, the microphone is below the entire logo. Vs on the 5D III the mic is above.

    Pic from

  • Athanasius Kirchner

    Except Pentax is famous for weather sealing; they have shown models with transparent plastic that showcase the many seals placed in their cameras. They sort of have a reputation to uphold, unlike Fuji and Panasonic (but not unlike Olympus). That’s the reason me and some others want to see a disassembly of a K-1.

  • bdbender4

    No disrespect to Pentax, but in the world of minor brands I would be much more interested in the Fuji X-T2, including their approach to weather sealing. And I am sure others are equally interested in Panasonic and Olympus. Again, no disrespect and no flame war intended, but I understand why Roger spends his limited time on the major brands.

  • Adam Fo

    The first photo I showed was the BACK of the magnesium mirror box frame. The lens mount is attached to the front of the mirror box .This is screwed to the magnesium main frame shown bellow to form the complete chassis as shown in the 2nd photo.
    These 2 parts are plastic or CRP on the 5 series and bellow

  • Michael Clark

    That’s the front half of the Main Frame. What you are calling the baffle panels are the pieces of the light box. They’re what make it light tight.

  • Thank you, Margo, that’s good to know.

  • margo2000

    It’s very difficult to put HDMI on a daughter board, because the signal speed is in gigabits per second. HDMI transmitter IC’s are designed to be traced out a very short distance across a PCB to a connector, and sending them through board layers or internal cables can make them fail the compliance test. So there’s more at play than simple cost-savings.

  • Adam Fo
  • Michael Clark

    All of the black pieces on the inside of the photos in the “mirrorbox” section.

  • Vlad Bieg

    No, I am not concerned with empty spaces inside the shell. I am reacting to complete lack of modular design preventing easy servicing, upgrading and customisation. Comparing this design with similar pro level film SLRs manufactured many years ago I observe significant increase of mechanical complexity which in turn makes manufacturing and assembly more expensive, and increases the chances of mechanical failures.

  • chris

    I don’t know about the HDMI interface, but for USB maintaining the correct impedance for the signal line is critical, and pretty difficult. Adding additional connectors and cables internally makes this even harder and would be avoided as much as possible. Gaining USB certification on even simple PCB is not trivial. I think in this case Canon have decided the use case for rugged connectors for these two interfaces isn’t justifiable as they are generally not used in the field for photography. The number of users using external monitors for video surly is fairly small.

  • Michael Clark

    I thought his new nickname was “coverplate”?

  • Adam Fo

    Can you point out which part photo you are referring to….

  • Michael Clark

    It seems to me that since amazon bought DPReview the score of a camera there is inversely proportional to the profit margin per unit that amazon makes on a sell. I stopped reading the test and review articles seriously a while back. The forums are still useful for what forums do.

  • Michael Clark

    Even the 1D X ( and the Nikon flagship bodies, too) have engineering grade plastic light boxes. They’re stronger, lighter, and expand/contract less in varying thermal conditions.

  • Athanasius Kirchner

    Please do the K-1, I’m sure there’s many of us wondering about its internals… Pretty please, with sugar on top? 😀

  • You mean Dubes Vader?

  • Actually, Tyler was able to get more than enough to fill first orders, which is a little unusual.

  • Totally agree. I wish people used it.

  • Omesh, not sure, I haven’t done any ‘chip chasing’. But I can send you a higher res image if you want to. Just email me.

  • Carl, I’m not sure at all. The only early reports I’ve gotten are from a couple of our techs who are shooting video and absolutely raving about how awesomely it’s working for that, especially maintaining focus. But I have no in-house reports on photo work yet.

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