Re: DID i Just FRIED my newly IOIO OTG board [HELP]

[Ytai Ben-Tsvi]

Sounds like a fried switcher.
I would try to replace the board. This is not supposed to happen.

On Apr 22, 2013 7:36 AM, "Kankuro Millionaire" <gotpay...@yahoo.com> wrote:

I been testing my newly acquired ioio otg.

i download the IOIO hardware tester in the market. Install it in my xperia S

I supply theboard with 12v 1000mA using jst connector, connect it with my phone and lunched the ioio hardware tester.

i was happy that the yellow LED light!!

so i tried to press the functionality test on IOIO hardware tester for 4 times i think, after that i disconnect the jst connector (pull the connecter right after)

then when iam going to test it with my tablet, the board was not powering up when i connected the JST connector with 12v 1000mA. :(

---i put the usb connector on my laptop, it was detected, even the LED for power is ON.

even i tap on the Vin and GRND to supply the board it doesnt power.

waaa, pls help. TIA guys.

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[Kankuro Millionaire]

is there some sort of repair to my board? say replace the switcher (btw when you say switcher sir you mean the host switch?, i found my host switch in position like in my attach image and my chg at fully rotated at the right towards the direction of  + )

[Ytai Ben-Tsvi]

The switcher is the little square component that sits above the letter "H" of the word "HOST" in your diagram.

It is possible to replace but requires some soldering skills and equipment (hot air station).

[Kankuro Millionaire]

Sir,i test the switcher using multimeter, by connecting to the grnd to SW and PVin, the output is a varying value of 80mV to 120mv.

I also test the CHG, by connecting left and top, left and bottom of chg  - the output is 0v.

sorry i dont know if what i did was important but i hope that would help to understand further the problem.

and last sir, can i bypass the switcher?

TIA again sir,

[Ytai Ben-Tsvi]

Your tests don't tell me much.
You can bypass the switcher by connecting the IOIO to a USB host such as your PC.

[Kiran Chinnam]

Just curious. Is the switcher the one that handles vin and spits out a clean 5v?

Can you bypass switcher by supplying a good 5v supply to the 5v rail on the otg board. If so can it be done with this problem occurring aswell?

[Ytai Ben-Tsvi]

@Kiran,

Yes to everything you said.

On Mon, May 13, 2013 at 11:08 PM, Kiran Chinnam <kchin...@gmail.com> wrote:

Just curious. Is the switcher the one that handles vin and spits out a clean 5v?

Can you bypass switcher by supplying a good 5v supply to the 5v rail on the otg board. If so can it be done with this problem occurring aswell?

[Ytai Ben-Tsvi]

There might be a potential recurring manufacturing defect. I'm currently checking this with SparkFun.

Has anyone encountered any such problem with non-SparkFun IOIO's?

On Tue, May 21, 2013 at 10:51 AM, Eduardo Balieiro <eduardo....@gmail.com> wrote:

Hi guys... my first post on this forum, but I needed to report that I fried my IOIO by just using 12V. Never had issues with my 7.8V battery.

Since this is the third post about this topic, I guessed that probably something may be wrong with some of the units distributed.

In the mean time I'll go back to the 7.8V to avoid this from happening again.

[Eduardo Balieiro]

For the record... I got mine from Sparkfun.

[LimitlessLED LED]

never had any problems with my 12v and 14 v power supplies and sparkfun ioio.

i have fried two though, but that was from ground loops when i had 5v pc and oscilliscope ground and 12 volt from wall supply. haha. ended up with negative voltage on my meter, hmm.

On Thursday, May 23, 2013, Ricardo Roldan Smirnov wrote:

I also fried my IOIO OTG...i didn't even notice how....i worked a week or so with no problems..(power 12v stable 1A)...doing some tests, suddently IOIO fried (no 5v nor 3.3v output)

..i find that connecting directly to 5v IOIO works, so I fried the switched regulator...but was really fast..maybe an acidental short circuit or so for lesthan a second...or harware problems

[Ytai Ben-Tsvi]

Short circuits or over-current on the switcher output are supposed to be well protected against. Over voltage or reverse polarity on the input are deadly.
As mentioned, I'm working with SparkFun to see whether there might have been a defect in manufacturing for one of the batches. Will keep you posted on the findings.

On May 22, 2013 10:22 PM, "Ricardo Roldan Smirnov" <roldan...@gmail.com> wrote:

I also fried my IOIO OTG...i didn't even notice how....i worked a week or so with no problems..(power 12v stable 1A)...doing some tests, suddently IOIO fried (no 5v nor 3.3v output)

..i find that connecting directly to 5v IOIO works, so I fried the switched regulator...but was really fast..maybe an acidental short circuit or so for lesthan a second...or harware problems

On Tuesday, May 21, 2013 3:51:14 PM UTC-5, Ytai wrote:

[Michael Bamberg]

I just lost two IOIO V1 trying to use 12V.

One gets REAL hot in the middle under the regulator, and the other had a little "twinkle" on the MCU and let the smoke out.

Mine were purchased from China and worked fine with 5V, but since one of the main purposes was to get the 5V from 12V, this is a very important feature for me.  I just ordered two more direct from Sparkfun, but if others are having problems with them, I'll wait to power them up.

Mike

[Ytai Ben-Tsvi]

Anyone having trouble with boards made by random Chinese manufacturers - good luck :)

Switching regulators are easy to screw up in manufacturing, in such a way that they'll work, but fail later while operating in their nominal ratings.

Also, the IOIO-OTG has an improved layout and parts as far as power supply is concerned. They are supposed to each be tested for over current and short to ground and remain fully functional under these circumstances.

[Michael Bamberg]

I just ordered two more from Sparkfun, the "good" ones I hope.

I would like to try and resurrect may last one (which was being programmed when the "host" let the smoke out). It still "might" be functional if I can get the bootloader installed.

I need more details on using a PIC programmer to write the bootloader directly to the unit.  I've searched around quite and bit but there seems to be no "cookbook" process describing how to hook up the PIC programmer, and download the hex-file into the unit.  Any guidance would be appreciated.

I have a avrisp_stk48 PIC programmer, will it work?

Mike

[Ashley Roper]

I also seem to have this problem, 

I purchased my IOIO OTG on 9th April from RoboSavvy a UK Spakfun distributor.

I can power it fine over usb, but nothing works when powering with 11V 1A via the VIN and GND, I had assumed there was something wrong with my power, but I have checked it now and it works fine.

[Ytai Ben-Tsvi]

@Ashley: nothing to add other than what I said above. Your VREG is almost certainly fried. There was previously a suspicious batch of boards out of SparkFun (manufacturing defect), which might explain this. I would ask the seller for a replacement and hope they are kind enough (SparkFun normally are).

@Michael: not sure whether this programmer supports PIC24FJ, but in any case, your programmer should have:

RST - mclr on IOIO.

Vcc - to 3.3V on IOIO.

GND - to GND on IOIO.

PGD - to pin 38 on IOIO.

PGC - to pin 37 on IOIO.

[Michael Bamberg]

Thanks for the details.

Mike

[Roy Hammel]

I believe I've got the same problem. Two IOIO-OTG's died on me randomly after working for a while. Both powered by the same power supply putting out a pretty steady 12.34V. Or at least I thought they died: they still work through the USB port as a slave to a desktop machine, but not through VIN. When trying to power them through the 5V hole next to VIN, they don't turn on and the voltage reading goes to about 1V.  Are the 3 5V holes next to VIN not the "5V rail"? Is there some other convenient (or not-so-convenient) location where I can plug in 5V? I really need to be able to plug an android tablet directly into the IOIO and I'm desperately short on time.

[Ytai Ben-Tsvi]

It might be that your VREG is failing in a way that is shorting the 5V rail. Try removing it.

Visit this group at http://groups.google.com/group/ioio-users.

[Roman Hošek]

Hi, did you get the replacement? I just run into the same issue as you. IOIO is from SparkFun reseller. Thank

Dne čtvrtek, 20. června 2013 7:21:16 UTC+2 Ytai napsal(a):

[Ytai Ben-Tsvi]

Just posted a thread titled "Updates on VREG frying issues" with some new findings on this issue.

Visit this group at http://groups.google.com/group/ioio-users.

[Antraxa Antraxo]

Hi Ytai

Did you get any new about the replacement ??

I have two IOIO OTG with this problem :(

[Ytai Ben-Tsvi]

News about replacement?

I'm not directly involved with the selling of the IOIOs and I don't get to decide when to replace an item. In general, I know that most people have had good experience with their vendors as far as getting replacements.

Let me mention here again how to be extra safe with this problem:

• Do not exceed 10V Vin.

OR:

• Use very short wires between your power source and Vin.

OR:

• Put a small series resistor (0.1 ohm) between your power supply and the IOIO Vin.

OR:

• Any other trick you can find to clamp the voltage to under 20V or limit the inrush current.