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Disassembling Joyetech eVic firmware image

Discussion in 'VV/VW APV Discussion' started by bitterskittles, Jan 14, 2013.

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  1. Janusxvii

    Janusxvii Senior Member ECF Veteran

    Feb 5, 2012
    Arizona
    Thanks runtpacket. That actually helps a lot. Based on that photo (specifically, the screws at the bottom), I am going to completely change my plan for how to go about the disassembly process.
     
  2. elmattias

    elmattias Resident Miyagi Verified Member ECF Veteran

    Jul 16, 2012
    N'awlinz
    from the looks of that itty bitty switch with those viciously thin wires, i'm leaning even more heavily in my thinking towards amp limitations on the switch....you guys push too much power you're gonna melt some solder clean off of that thing
     
  3. AttyPops

    AttyPops I need a dang haircut. Stupid CV-19. ECF Veteran

    Supporting member
    I'm pretty sure there's a power-FET in there somewhere attached to the switch/MCU (or built into another component). The switch is probably only using ..IDK...guessing maybe 10 mA with a current limiting resistor in there somewhere.

    But you're correct that there's probably an amp limit or something in there overheats...like the FET...so your point is well taken. Just ignore the little wires on the button.

    People keep using "the switch" in the entire module sense and it really means button. That button is only activating something else.
     
  4. WhiteNoyze

    WhiteNoyze Full Member

    Feb 6, 2013
    Texas
    Yay, I can post here now. I joined the forum so I can contribute. My eVic is trashed, but my wife's still works so i'm interested what kind of development can be done on this. I "disassembled" my evic if ya'll want some pictures or a donation control head.

    The top and bottom pieces are epoxied together or something. I wasn't able to get it apart with some man strength and a couple of pairs of pliers. I ended up dremeling off the acrylic leaving the internals in place.
     
  5. Judge Dredd

    Judge Dredd Reviewer / Blogger Verified Member ECF Veteran

    Supporting member
    Nov 4, 2012
    127.0.0.1
    I would really like some pictures if possible!
     
  6. WhiteNoyze

    WhiteNoyze Full Member

    Feb 6, 2013
    Texas
    https://picasaweb.google.com/109360892928485177847/EVic?authuser=0&authkey=Gv1sRgCLTyqKCc7K6M0AE&feat=directlink

    I've got to find a tiny screwdriver to take out the screws so hopefully I can get the other 2 boards off. If not i'll have to whip out the soldering iron if they are soldered to the bottom board.

    Good news, there is no resin on the chip.

    EDIT: Added a few more pictures after I took off the control ring. The boards are soldered so i'll have to unsolder them later. I need to go shop for a replacement mod first :/
     
  7. Judge Dredd

    Judge Dredd Reviewer / Blogger Verified Member ECF Veteran

    Supporting member
    Nov 4, 2012
    127.0.0.1
  8. Janusxvii

    Janusxvii Senior Member ECF Veteran

    Feb 5, 2012
    Arizona
    Those photos are much appreciated. I especially liked all the photos illustrating the control ring. So there is epoxy at the top and bottom? Also, I am noticing a disc shaped object sitting on the top of the boards (it looks like it has some sort of kapton tape on it). I can't make it out very well but it kind of looks like a battery (like you would find in a watch). Can you confirm this?
     
  9. Janusxvii

    Janusxvii Senior Member ECF Veteran

    Feb 5, 2012
    Arizona
    I just had a thought while I was mentally processing those photos. If the plastic tube needs to be cut in order to get to the innards I wonder if it would be possible to find an industrial supply company selling plastic tubing that could be cut to length and used as a replacement. If you didn't completely destroy it (or throw it out) could you please tell me the inside and outside diameters? Who knows, maybe we could even find colored plastic tubes. I know that's getting a little off the subject but it would be kind of cool.
     
  10. bitterskittles

    bitterskittles Full Member

    Jan 14, 2013
    Ireland
    Good thinking. I'd like a clear plastic tube on my eVic controller head ^^
     
  11. Janusxvii

    Janusxvii Senior Member ECF Veteran

    Feb 5, 2012
    Arizona
    I was thinking that too. Maybe it would help make it easier to read the screen when I'm outside.
     
  12. runtpacket

    runtpacket Senior Member Verified Member ECF Veteran

    Mar 2, 2009
    Captain Obvious here! that small watch like battery. I would assume is just that a battery. as the control head does remember some settings when the main battery is out.
     
  13. bitterskittles

    bitterskittles Full Member

    Jan 14, 2013
    Ireland
    According to the datasheet, there's 2 KiB flash memory built into the MCU
     
  14. Disconnect

    Disconnect Ultra Member Verified Member ECF Veteran

    Jan 25, 2013
    Washington DC
    It probably has at least a capacitor somewhere, since it keeps time when off the battery..
     
  15. Janusxvii

    Janusxvii Senior Member ECF Veteran

    Feb 5, 2012
    Arizona
    Yeah, it seems to me that it would need a small constant power source in order to keep track of the date and time. I was just looking to confirm that it was in fact a battery based on the photographs.
     
  16. Koman

    Koman Moved On ECF Veteran

    Jan 7, 2010
    lv
    I think that's definitely the case!
     
  17. dsy5

    dsy5 Ultra Member Verified Member ECF Veteran

    Nov 18, 2010
    New York
    More than likely the chip has a house number on it and would be impossible to identify (a house number is an unrelated part number made specifically for the customer, in this case, Joyetech). If not, they usually scratch the numbers off.
     
  18. EricSFla

    EricSFla Full Member

    Sep 16, 2012
    Harrisburg, PA, USA
    Wow, awesome pics!!! Thanks!
     
  19. EricSFla

    EricSFla Full Member

    Sep 16, 2012
    Harrisburg, PA, USA
    That would make it much easier to see the screen and to change up the look.
     
  20. zippersnapper

    zippersnapper Moved On ECF Veteran

    Mar 18, 2012
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