1. yaum

    OP yaum Advanced Member
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    Hi, I recently bought a non-functional new 3DS XL from eBay. Seller said no power due to coffee spill.

    Upon reception, I started to open and clean it. It was drenched in coffee, top and bottom cases, but no apparent damage or corrosion. I disassemble absolutely everything, top and bottom cases, washing the case in water, and all parts with IPA. I could not find additional damage, even under the electromagnetic shields. Top screen flex cables were all microscope screened, without fault found.

    After full reassembly, I was quite confident the n3DS XL would work, at least partially. But not chance, nothing worked at all. Battery voltage is 3.75, and after pressing the power button (contact button functionality was tested), no blue light lit. When plugging in a working charger, no charge light either.
    I tested the two fuses on the main and on the daughter boards, tested all resistors OK, and diode (in blue) gave a reading of 0.150v and working as diode.
    [​IMG][​IMG]

    When connected to the boards, the battery reading was 0v...

    I decided to perform additional checks, starting by the only untested ribbon between main and daughter board, and: One trace was broken between 2 pads, I had hopes I could solder enameled wire to repair it. It appeared that I could, but pulled too strong on the soldered wire and ripped off the weakened pad!

    After that, I kind of gave up. I'll try tonight to recreate a pad on the broken ribbon. Anyone has a mapping of test points for each trace on this ribbon?

    Maybe this will at least make the n3DS XL display a sign of life, but I'm unsure now. Do you have any more hints on things to check?

    I've seen a ribbon being sold for 20€, none on Aliexpress. If I cannot fix it, any idea where I could find one for cheap as I'm unsure this will fix anything?

    PS: I have a history of repairing original 3DS XL, but not n3DS XL...
     
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  2. yaum

    OP yaum Advanced Member
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    Soooo, I took my soldering iron, and tried to repair the ribbon between main & daugther boards.

    Here is the enameled wire before pad reconstruction
    upload_2020-9-12_8-17-45.png

    And the pad right after:
    upload_2020-9-12_8-17-55.png


    Looks dirty, but connectivity is ok, no shorts on adjacent pads.

    And, finally I got the 3DS to work! Everything works now: wifi, sd card, all pads (except thumb button, still have to test it).Screens are working too, but are very cloudy. Will try to have a look inside to see if something is feasible.
    upload_2020-9-12_8-37-26.png
     
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  3. Posghetti

    Posghetti Un-official ReVeluv Leader
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    Nice work my guy.
    Can I ask, what kinda of camera/microscope setup are you using?
     
  4. yaum

    OP yaum Advanced Member
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    Hi @Posghetti , sure, here is the link:
    https://fr.aliexpress.com/item/32816285552.html
    Cheap stuff, with aluminium stand, it's doing the job for around 30$.

    In the meantime, I had fun with the LCDs, to see if I could do something about them even if soaked with coffee:
    Dismantling the bottom screen:
    upload_2020-9-12_19-45-37.png

    Detail of the multiple layers beneath the LCD, including led lights. You can see it's not transparent at all...
    upload_2020-9-12_19-46-41.png

    After cleaning each layer with water & soap (not the LCD by itself of course) here is the result:
    upload_2020-9-12_19-48-29.png
    Top screen is as good as new, but bottom screen has streaks on the outside, slightly visible. I anyways have to change the digitizer as it is scratched,I'll change both the bottom screen & digitizer...

    For those interested in cleaning water damaged LCDs, you can read this article:
    http://smilecitrus.info/?p=2698
     
    Last edited by yaum, Sep 12, 2020
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  5. lygok

    lygok Member
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    The hand of God!Very cool!
    I have two questions. Would like to answer me?
    Thank a lot!Thank a lot!Thank a lot!Please!Please!Please!

    One:
    I put my battery in backwards.
    My left pcb is broken,Console cant turnning on.all lights cant working.
    I take this Motherboard to the other console.it s working,but it cant charging in sleepmode or turn off mode,just working after system working.
    I wanna to know,Which chip might be broken? How to test with a multimeter??

    Two:
    Other N3DSXL home buttom is disabled!
    I tested it with a multimeter。Its ok。but It can`t working in console turnning on .
    My ios was B9S and the latest system。

    WHY????

    Would you like to help me?????
    Thank a lot!Thank a lot!Thank a lot!Please!Please!Please!
     
  6. yaum

    OP yaum Advanced Member
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    Hi, hand of god is a bit too far... I would have it fully restored as new if I was at this level :)

    Check this out:
    https://gbatemp.net/threads/new-nintendo-3ds-xl-what-charging-chip.454737/
    It could be the charging chip mentionned in this thread.

    Hard to say... Did the button work at a given time? Did it stop after hacking the console, or just by itself? Could be the connector, the cable, the motherboard, software... (even if I have doubts about software)
     
  7. lygok

    lygok Member
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    Thanks a lot for reply。
    I know the first problem is in the power management chip and the charging chip. I'm going to replace it
    But do you know what happened to the second question? It's the home key failure.
     
  8. AnimeIsDead

    AnimeIsDead Member
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    Wow good stuff man, btw how much did you buy the 3ds for and how much did it cost to repair?
     
  9. lygok

    lygok Member
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    N3DSxl payed 30$. Fix it for fun
     
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  10. AnimeIsDead

    AnimeIsDead Member
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    The question was meant for yaum but it's cool how you're fixing up a 3ds as well.
     
  11. zxr750j

    zxr750j GBAtemp Fan
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    What a wonderful post, when I started reading I thought it was a mission impossible ending with a question for impossible help. But you are really great in you persistence, cleaning- and soldering-skills!
     
  12. yaum

    OP yaum Advanced Member
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    Cost for console was 25.50€, and 5€ for shipping:
    https://www.ebay.fr/itm/console-nintendo-3ds-xl-pour-pieces/383698760294

    Cost for repair... well... 0€ (not counting the time spent on it, or the hardware needed to fix it)


    Happy to make your day :)
    I must say that n3DS XL debug is a bit more difficult than the old one...
    I lost a bit hope when frying the pad on the connector, but finally I made it work.
    And when I did fix the console, the screens were bugging me like: hell, I lots of time on cleaning stuff in the console, and there is still more crap in there. With the screens lost anyways, I decided to take them apart and clean them, and it was a good choice!

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

    Hello, I can't get any further before you answer my questions below:

     
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  13. lygok

    lygok Member
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    I don`t know! The N3DS is a broken console with ribbon clip.I buyed it and fixed it. but home button is disable。I changed a home bottom and it didn't work. may be Daughter board or motherboard?Maybe home buttom Interface resistance?I want to know!how to test it?
     
    Last edited by lygok, Sep 22, 2020
  14. yaum

    OP yaum Advanced Member
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    Given the fact that the Home button is connected to the main board, if anything is wrong, it has to be on the main board.
    I understood that you have 2 N3DS XL. Swap home buttons to weed out the button from possible failures (highly improbable that both are dead).
    Then, clean cable side, and connector side with IPA, be very careful with the zif connector, you don't want to do additional damage.

    After, plug again the connector, and check if you can measure proper connector operation on the motherboard soldered pins ( in red)
    upload_2020-9-22_16-29-43.png
    It could be that the zif connector is not putting enough pressure on the cable, making bad contact. if it's the case, getting a heavy paper in the zif could help restoring contact.

    If none of this works, I'd test continuity on the working MB between this connector and existing test points, and check it I have the same behavior on the non-working one (but that would be a pain in the a**)
     
  15. lygok

    lygok Member
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    I see!I'll try it now. thanks a lot。
     
  16. yaum

    OP yaum Advanced Member
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    Back on this console, it works like charm when it has energy left in the battery.
    However, I left it switched off (not in standby) for 3 days, and the battery was fully depleted, and the n3DS was unable to boot, or charge!
    When plugging in the power cord, charge led would lit for 3 or 4 seconds, then dim and finally go dark.

    I disassembled the console again, and it seems that there is some kind of short circuit on the daughter board: daughter board totally unplugged, there is a around 400Ohms between the + and - battery connectors. After messing a bit with the transistors, resistance even lowered to 150 Ohms.
    When comparing to another working daughter board, I get infinite resistance between the two leads.

    Any idea where to search for a short without desoldering every component?
     
  17. yaum

    OP yaum Advanced Member
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    Update: Seems that the problem is no more, since I removed and deep cleaned the daughter board
     
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