[SOLVED] short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

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Panoptis
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[SOLVED] short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by Panoptis » Fri Jun 07, 2019 4:34 am

I know, I'm stupid... :roll:

Good news is that the chipset seems to be fine. Got HDMI output and System (SD) boots up.
USB, Ethernet and I/O Pins are dead.

At least the FTK3407 Transistor got fried.
Can this damage be repaired? Or is it likely that more components were affected?
What could I use as a replacement?

Any help is appreciated!
Last edited by Panoptis on Fri Jun 14, 2019 4:50 am, edited 2 times in total.

phaseshifter
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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by phaseshifter » Fri Jun 07, 2019 7:34 am

any low voltage p type fet inc diode..most do have ..browse ftk3407 if you can solder it..but about the rest of the board who knows
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Panoptis (Sat Jun 08, 2019 7:33 pm)
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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by joerg » Fri Jun 07, 2019 4:55 pm

If you can desolder the Q1, you then could check if the VDDAO_3V3 is there and also if there is no short circuit on the VCC3V3 side. If everything fine you can make test wise a jumper from VDDAO_3V3 to VCC3V3. Any stable 3.3V connected to pin1 would do this also. If you find everything working, you have luck! Because it would be possible to solder a transistor with fine equipment and a sure hand... ;)
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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by Panoptis » Sat Jun 08, 2019 7:43 am

joerg wrote:
Fri Jun 07, 2019 4:55 pm
If you can desolder the Q1, you then could check if the VDDAO_3V3 is there and also if there is no short circuit on the VCC3V3 side. If everything fine you can make test wise a jumper from VDDAO_3V3 to VCC3V3. Any stable 3.3V connected to pin1 would do this also. If you find everything working, you have luck! Because it would be possible to solder a transistor with fine equipment and a sure hand... ;)
Thank you for your detailed response @joerg!
Did exactly that, desoldered the broken Transistor and left a solder bridge between VDDAO_3V3 and VCC3V3.
Everything seems to be working so far (tested: USB, Ethernet, IR, eMMC, SD, IR) :D

Did not leave the N2 running for long, could someone bother to briefly explain what the purpose of that circuit is? What would happen if I left it like that?

Thanks @phaseshifter for the explanation about the Transistor.
Would this be a suitable replacement?
(I could not find a FTK3407 with quick delivery in europe)

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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by mad_ady » Sat Jun 08, 2019 2:12 pm

@Panoptis: could you make a more detailed description of what went wrong, where tghe transistor is located, how you identified it was broken and how you bypassed it? I expect more people will run into this issue sooner or later...

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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by joerg » Sat Jun 08, 2019 5:51 pm

@Panoptis: The replacement you found has 3A maximum current. Maybe it is enough, who knows. I found this type TSM650P03CX on reichelt.de in germany, it has also 4A and low on resistance. I don't know if you can order from there or you could find another shop.
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Panoptis (Sat Jun 08, 2019 7:33 pm)

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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by Panoptis » Sat Jun 08, 2019 8:06 pm

mad_ady wrote:
Sat Jun 08, 2019 2:12 pm
@Panoptis: could you make a more detailed description of what went wrong, where tghe transistor is located, how you identified it was broken and how you bypassed it? I expect more people will run into this issue sooner or later...
Sure.

Snatched a spdif audio LED from an old Mainboard and got it working with the N2.

Sound was gone and I fond it was due to a loose contact at the wire coming from the spdif socket (probably bent it too often when fixing the socket to the N2 case with a little hot glue).
That's when I should have switched the N2 off and repaired the connection but I instead jiggled it a bit to get sound back until the end of the movie :mrgreen:
... vcc wire came of completely and touched GND, puff of smoke from wire and N2. No more power on 3.3 V lane.

Turned it off and examined the Board with schematic open (memorized what side of the N2 the smoke came from) and saw the damage on the mosfet (see my first post) that was also clearly important for the 3.3v lane as I could decern from the schematic.
EDIT: as to where it is located, you can see the sys and pwr LEDs in the Image.

Then I followed @joergs post, used a cheap soldering kit I already had and carefully removed the FTK3407 with tweezers and soldering iron, one connection after the other.
Used a tiny amount of solder to bridge source and drain and since it seems everything else seems fine, ordered the TSM650P03CX joerg recommended.
Will report when it arrived and I soldered it (will be a few days).

Still don't know what the Q1/Q2 mosfets and the circuit (second image in Imgur gallery in my first post) does exactly... I guess voltage stabilization?
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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by mad_ady » Sun Jun 09, 2019 1:24 am

Sorry, I hadn't followed the imgur link. Now it's more clear.

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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by phaseshifter » Sun Jun 09, 2019 3:13 pm

optics work just fine on the n-2 look here..i salvaged my optic Txmtr out of a junked dvd player..

viewtopic.php?f=181&t=34528#p252166

this whole thread is informative...
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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by Panoptis » Sun Jun 09, 2019 11:31 pm

phaseshifter wrote:
Sun Jun 09, 2019 3:13 pm
optics work just fine on the n-2 look here..i salvaged my optic Txmtr out of a junked dvd player..

viewtopic.php?f=181&t=34528#p252166

this whole thread is informative...
Yeah, also read that. Had to adjust mux groups setting in ubuntu.
In CoreELEC it was already correctly set to pin 13.

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Re: short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by Panoptis » Fri Jun 14, 2019 4:49 am


Not the best soldering job but good enough.
Everything seems to work so far!

Consider this resolved.

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Re: [SOLVED] short-circuited Pins 1 (3.3V) and 9 (GND) - periphery dead

Unread post by odroid » Fri Jun 14, 2019 12:10 pm

Glad to hear you fixed your board by yourself. :o

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