1. GrimDim

    OP GrimDim Advanced Member
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    Hi, I've previously made a post here which helped me determine the likely cause of my booting issues to be the BCM4356. Since then I saw other people linking the orange screen and boot issues to the wifi chip as well. So my hopes were high to finally fix this.

    Since then I've first reflowed, and then replaced the wifi chip twice, but I'm not getting anywhere.
    To make sure the soldering went alright, I took some X-ray images of the chip and to me it looks good now. (The bottom one is a reference image from another board.)
    BCM4356_v2.png BCM4356_ref.png

    Note that in my first (botched) attempt below you could clearly see some bridged solder balls. (In this state the switch wouldn't even power on.)
    BCM4356_v1.png

    But I guess I don't know enough to clearly say if the chip is on correctly. Yes there are no bridges, but does the image indicate that all solder balls made proper contact with the pads? Or would that look slightly different? The current symptom is back to being stuck on the boot logo. As I've stated in my first post, the rest of symptoms are: everything works hardware wise in Linux, except WiFi (but Bluetooth does).

    If you have any idea on how to proceed from here, I'd massively appreciate it.
     
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  2. FXDX

    FXDX GBAtemp Regular
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    Stuck on the boot logo has nothing to do with BCM4356, but rather with M92T36. I solved the orange screen with reflow on BCM4356. Did you have an orange screen and now after you replace BCM4356 is stuck on the boot logo?

    yy.jpg
    I find something blurry in the red area........
     
    Last edited by FXDX, Mar 9, 2020
  3. GrimDim

    OP GrimDim Advanced Member
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    Thanks for your reply, but I don't think that's true. Stuck on boot CAN be due to M92T36, but that usually comes with charging problems right?
    Either way there are more people who have made the connection between boot issues and BCM (see my original thread), or this guy whose switch flip flops between orange screen (when it does boot) and stuck on boot logo (). I think because the wifi chip issue is so intermittent for many people, it either craps out during boot (in which case you get stuck), or while it's running (in which case you get the orange screen).

    I had the orange screen in the very beginning when it first stopped working, after which it's always been stuck on boot. Then I started replacing the chip.
     
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  4. ds34

    ds34 GBAtemp Regular
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    1. How tf can you take X Ray photos of your switch?
    2. On which logo does it hang on?
    3. Does WiFi/Bluetooth work when you're running Android?
     
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  5. FXDX

    FXDX GBAtemp Regular
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    Possible that !
     
  6. GrimDim

    OP GrimDim Advanced Member
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    :lol: There is an old X-ray inspection machine at my university. I think PCB assembly factories normally use those to check their boards.

    It hangs on the Nintendo Switch logo (not the first Nintendo one).

    As mentioned, Bluetooth worked when I tested it a while ago, while WiFi did not!
     
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  7. ds34

    ds34 GBAtemp Regular
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    Does it work when you're running Android?
     
  8. GrimDim

    OP GrimDim Advanced Member
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    Yes good catch, but this seems to be always present (maybe from stuff underneath?) if you compare to the reference board (first image is mine, second is reference).

    — Posts automatically merged - Please don't double post! —

    I did try android originally as well, same deal WiFi was not working.
     
  9. ds34

    ds34 GBAtemp Regular
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    Oof. You already mentioned that it's working when you're running Linux. What's up with that fuse above P13USB? A friend of mine told me that those cause this issue.
     
  10. GrimDim

    OP GrimDim Advanced Member
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    Nono, WiFi does not work in any OS, at all. (everything else does though)
    Thanks for the tip, I'll try to find that one since I have never looked at it.
     
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  11. GrimDim

    OP GrimDim Advanced Member
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    Are you sure there is a fuse around P13USB? I couldn't find any.
    This high-res image shoud be great for referencing: https://switchbrew.org/w/images/7/70/Switchre_side2.jpg
     
  12. ds34

    ds34 GBAtemp Regular
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    Sorry, I meant capacitor. Remove it and check for shorts.
     
  13. GrimDim

    OP GrimDim Advanced Member
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    Ah yeah the capacitor is fine, no shorts.
     
  14. ds34

    ds34 GBAtemp Regular
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  15. ds34

    ds34 GBAtemp Regular
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    What about the components around the BCM chip? Where did your get the replacement chip?
     
  16. linuxares

    linuxares I'm not a generous god!
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    GrimDim and ds34 like this.
  17. ds34

    ds34 GBAtemp Regular
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    Indeed. They might be able to help. Could this also be related to the SoC?
     
  18. linuxares

    linuxares I'm not a generous god!
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    I think it might be personally. I would go to the forum for Tronics Fix and ask. This is some really cool thing with the X-ray.
     
  19. linuxares

    linuxares I'm not a generous god!
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    @GrimDim can your switch boot in to example RCM mode? Or orange instantly?
     
  20. ds34

    ds34 GBAtemp Regular
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    That's impossible. As far as I know screen the orange screen is caused by an kernel panic indicating a fault with the WiFi/Bluetooth chip.
    RCM mode doesn't require Horizon OS's kernel.
    Am I right?
     
    Last edited by ds34, Mar 10, 2020
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