1. Ttm3

    OP Ttm3 Member
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    Is pin 6 on the m92t36 input to the chip or is that voltage being provided by the chip? And if that circuit isn't shorted what could be causing it to be at 0 volts with battery attached and plugged in?
     
  2. Pintglass

    Pintglass GBAtemp Fan
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    Pin 6 is 3v3 input to M92T36 supplied by the 3v3 rail from the dc-dc converter situated just above the audio ic.
     
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  3. SlegBE

    SlegBE Member
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    Above the audio IC ? Did you mean by power IC? Or I am wrong. Where is the DC Converter situated?
     
  4. bombob

    bombob Advanced Member
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    Im also interested in that.Coz I just swapped out this chip and pin6 worked on and off till it stopped working at all

    Sent from my SM-N960U using Tapatalk
     
  5. Ttm3

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    I can't find it above the audio ic. which component is it?
    Thanks for you help BTW
     
  6. Pintglass

    Pintglass GBAtemp Fan
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    There's only one ic above the audio ic you can't really miss it.
     
  7. Ttm3

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    The bga chip?
     
  8. Pintglass

    Pintglass GBAtemp Fan
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  9. Ttm3

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    Sorry I was looking for a qfn chip.

    that can't cause a 0 amp charging condition can it?
     
  10. bombob

    bombob Advanced Member
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    If u have no power on pin 6 u will have no charginh

    Sent from my SM-N960U using Tapatalk
     
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  11. Pintglass

    Pintglass GBAtemp Fan
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    What voltage have you got on pin 1 of bq24193 with the official nintendo charger plugged in?
     
  12. SlegBE

    SlegBE Member
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    @Pintglass Sorry but the chip above audio IC (depending of board orientation ;) )is identify as DAC + stereo headphone amplifier and not a DC/DC converter.



    switch-teardown-6.jpg
     
  13. Pintglass

    Pintglass GBAtemp Fan
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    I think that was originally posted by @FXDX I'm not sure whether it was identified by himself or someone else but if you look at the datasheet for the TC94B15 its a different size and the components for that ic do not correlate to whats around the ic on the board so I'm sorry but this has been misidentified.
     
  14. Ttm3

    OP Ttm3 Member
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    So if I hit the power button I get 3.5 volts on pin 6. But I get no voltage from the Nintendo charger. I get roughly 5 volts on pin 1 of the bq24193 (aka bbq chip in my house) chip with an aftermarket charger...

    The Nintendo charger works fine with my other switches so it must see a fault and stop pushing voltage. This is the same with the connector flipped either way. The Nintendo charger does not supply voltage to the board at all. Not even before the fuse
     
  15. Pintglass

    Pintglass GBAtemp Fan
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    Can you provide some close up images of the M92T36 area on the board your trying to repair
     
  16. Ttm3

    OP Ttm3 Member
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    Attached Files:

  17. Ttm3

    OP Ttm3 Member
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    Is that good enough or do you need more?
     
  18. Pintglass

    Pintglass GBAtemp Fan
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    I can't really see much wrong with the M92T36 it looks ok
    What voltage do you get on pins 2, 3 and 4 of bq24193 with the charger plugged in
     
  19. Ttm3

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    Pin 1 - 5v
    Pin 2 - 4.1
    Pin 3 - 4.1
    Pin 4 - 1.5
    Pin 5 - 4.1
     
    Last edited by Ttm3, May 22, 2020 at 11:31 PM
  20. Pintglass

    Pintglass GBAtemp Fan
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    Is pin 4 constant at that voltage or is it going from low to high.
     
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