1. Adrill

    OP Adrill Member
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    Hello, I'm trying to repair a Switch. I replaced the BQ24193 and all the resistors & caps around it (from a dead Switch, they were removed from a previous repair), but with 3 different batteries it charges them at 3 different values: 0,25A, 0.9A or 2A.
    I never see the transition to 0A then the fast charge.

    Also I saw the "Nintendo" logo one time but it switched off just after, and now I can't get anything on the screen.
     
  2. Adrill

    OP Adrill Member
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    Hi, nobody had this issue?
     
  3. Mightyjebus

    Mightyjebus Member
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    have you tried replacing the USB-C?
     
  4. Ttm3

    Ttm3 GBAtemp Regular
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    This is not necessarily wrong depending on how charged those batteries were & assuming they are good batteries. Does it show anything on the screen when charging? Can you boot into hekate?
     
  5. Adrill

    OP Adrill Member
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    I can boot on hekate, but even with its latest release, when I use the "launch" option the Switch shows the "Nintendo" logo then a black screen.
    I have to press the power button ~15 seconds before I can power it on again.

    Edit, some more tests:
    • with hekate, black screen whether I start the stock FW or Atmosphere (no backlight)
    • with fusee-primary and Atmosphere, black screen after the black & white Atmosphere logo (no backlight)
    • I measured 3.3V on the pins 5 & 6 of the M92T36, 15V on its pin 9: I guess it's fully working, or is there still a possibility for it to malfunction?
     
    Last edited by Adrill, Nov 16, 2020
  6. Adrill

    OP Adrill Member
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    Little update: I tried this guide to rebuild the eMMC: https://suchmememanyskill.github.io/guides/unbrick/#mmc-rebuild
    After the "systemRestore" script executed, the Switch was still not booting, so I tried the "systemwipe" script, and it's still not booting!

    How can I test if it's a software or hardware issue?
     
  7. Ttm3

    Ttm3 GBAtemp Regular
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    What does hekate report for battery stats?
     
  8. Adrill

    OP Adrill Member
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    1.png

    I would say they are correct?
     
  9. Ttm3

    Ttm3 GBAtemp Regular
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    It shows 0ma charging & charge terminated but looks like it is plugged in charging. Is this plugged into a computer or a charger?
     
  10. Adrill

    OP Adrill Member
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    You're right that's strange, it was on my computer.

    I tried with an other battery, here on my computer:
    2.jpg

    And with the official AC adapter, but it capped to 1A?
    3.jpg

    But it's still not booting.
     
    Last edited by Adrill, Nov 22, 2020
  11. Ttm3

    Ttm3 GBAtemp Regular
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    Can you boot into Linux? I recently had a bad fuel gauge keep the system from booting into the switch firmware, but it booted into Linux. It read fine in hekate but was not reporting correctly in Linux. A new fuel gauge corrected mine.

    Probably not your problem but it's free to check
     
    Last edited by Ttm3, Nov 23, 2020
  12. Adrill

    OP Adrill Member
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    I just tried with L4T 3.2, and it seems to have the same issue. I can see the purple splash "switchroot UBUNTU" for 2 seconds then black screen again.

    Is it possible to have a bad component (the M92T36?) that is half-working? Like just enough to boot in RCM mode but nothing more?
     
  13. Ttm3

    Ttm3 GBAtemp Regular
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    If it won't boot into Linux I would definitely be looking at a component. Linux takes a while to actually boot. I'd make sure that bq24193 is seated properly & soldered well. I've never seen an m92t36 cause those symptoms.
     
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