No HDMI output when docked, okay as a handheld

Discussion in 'Switch - Console, Accessories & Hardware' started by WadsRUs, Jan 4, 2019.

  1. WadsRUs
    OP

    WadsRUs GBAtemp Regular

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    Jun 12, 2009
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    First I'll say that my dock, monitors, cables, etc, etc are fine, all work with other Switches.

    So I bought this Switch as faulty - the USB-C connector had some bent pins so I replaced this (have done this a number of times now on other Switches so I know what I'm doing - I'm also fine with microsoldering).

    After replacing the USB-C connector I charged up the battery via an external adapter (not in the dock as I was using it with my own Switch at the time).

    Once charged to a reasonable amount the Switch booted just fine, games could be played as a handheld, etc. However, there's no HDMI output when docked.

    Checked all system settings, even did a factory reset.

    Note: this Switch is running firmware 3.0.1

    Using my multimeter I buzzed through the 'hidden' pins on the USB-C connector (I have a post elsewhere on how to do this) and they're fine, all connected.

    (I've had this issue once before - replacing the PI3USB chip fixed it - well, in a way - with that Switch I replaced the chip, it didn't help, but on putting back the original PI3USB the HDMI output was restored so I guess there was a dodgy connection on that chip that happened during manufacture (so really I should have re-flowed it first)).

    Anyway, back to this faulty Switch with no HDMI - I checked for any shorts, etc. Then I re-flowed the PI3USB - no change. I replaced the PI3USB - no change. I decided to replace the M92T36 - no change. I then decided to take a wild stab in the dark and change the BQ24193 (that can cause some weird things when faulty) - no change! Note: I checked for shorts around all of the replaced chips.

    So I'm stumped.

    Any ideas please?

    Is there anything in particular that I can or should measure with my multimeter or any other chips that could cause this?

    Thanks
     
    Last edited by WadsRUs, Jan 4, 2019
  2. WadsRUs
    OP

    WadsRUs GBAtemp Regular

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    No ideas anyone? :)
     
  3. HtheB

    HtheB GBAtemp Advanced Fan

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    Bize Her Yer Trabzon
    Pictures of the faulty board would probably help
     
  4. WadsRUs
    OP

    WadsRUs GBAtemp Regular

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    There's nothing to see - it's just your standard HAC-CPU-10 revision, looks no different to any other, nothing missing, nothing broken, shorted or corroded.
     
  5. Rauliki

    Rauliki GBAtemp Regular

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    Oct 24, 2016
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    Does the hdmi cable work with anything else? Maybe try different one?
     
  6. PyroGoat

    PyroGoat Member

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    Feb 27, 2015
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    OP said dock and cables are "known good" as it works with another switch.

    I also have a Switch with this problem, only works in handheld mode.

    Good luck and keep us updated, I have other priorities at the moment.
     
  7. WadsRUs
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    WadsRUs GBAtemp Regular

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    I hope to get back to work on it in a few days, other things have cropped up lately that have demanded my attention.
     
  8. The Real Jdbye

    The Real Jdbye Always Remember 30/07/08

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    Alola
    The PI3USB30532 would have been my guess. However, it could be one of the components attached to it as well (capacitors, fuses, anything like that - not too familiar with the internal layout of the Switch)
    Do the Switch and dock both recognize that the Switch has been plugged in (the screen goes dark and the LED lights up solid green?)
    Have you tried setting the resolution to 480p, on the off chance that there's some interference or the signal quality is too poor to output 1080p?
    Have you tested the ports (USB-C and HDMI) on the dock itself?
    Have you tested USB OTG?
    If everything tests OK and you still can't get any output, it could be something to do with the SoC itself, or one (or more) of the small components on the board is faulty. But it will be tricky to figure out exactly what's wrong, you're in uncharted territory now. At this point, most professional repair people would consider the board unrepairable, and use it for spares.
     
    Last edited by The Real Jdbye, Jan 11, 2019 at 7:08 PM
  9. WadsRUs
    OP

    WadsRUs GBAtemp Regular

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    This is what I next intend to check in a few days when I have some other things out of the way.

    Yup, that's working fine.

    Tried that, no dice.

    They're fine - my own Switch and others don't have any problems with the same dock.

    Note: The Switch WILL charge in the dock.

    That's a very good point, I haven't but will do so.

    I don't like to give up. This is fun and it's a learning exercise. :)


    Thanks for your ideas.
     
    The Real Jdbye and PyroGoat like this.
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