My question is, how does a USB Jig work?
Why does this small cut-off/altered piece of a USB cable do what it does?
It's a micro usb head with a 301k resistor between some of the pins which makes the bootloader reset the counter, theres loads of threads about this.
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veyka said:
It's a micro usb head with a 301k resistor between some of the pins which makes the bootloader reset the counter, theres loads of threads about this.
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This isn't a thread asking about what the hardware is, the question is, why does it work? What's so special about this 301k resistor that makes the unit go into download mode and reset the counter?
NOOB question. Does anyone know if the USB jig for the original SGS works for the SGSII?...
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ccrows said:
NOOB question. Does anyone know if the USB jig for the original SGS works for the SGSII?...
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yep bro, it works.
if i helped, use the thanks buttom
I'm in the preocess of making my own jig, just picked up the resistors today (300k and 1k since maplin suck and dont carry a clean 301k)
My guess is that the jig works by sending a low voltage signal down a normally disused USB line.
USB 2.0 heads have a fifth 'unused' pin, specificly for manufacturers of devices to add in thier own proprietary signal line. By shorting the ground and a signal pin, via the resistor, you probably trigger a reset signal to the phones 'bios' rom.
And why 301k ohm? Probably, originally, to make it harder for non-samsung personel to 'guess' the correct trigger voltage. It could have easily been 235kOhm or 20M Ohm or anything.
This is conjecture honestly, but it makes sense to me.
ccrows said:
NOOB question. Does anyone know if the USB jig for the original SGS works for the SGSII?...
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It works. Had a jig for my Captivate and now using it for SGSII
Sideromelane said:
I'm in the preocess of making my own jig, just picked up the resistors today (300k and 1k since maplin suck and dont carry a clean 301k)
My guess is that the jig works by sending a low voltage signal down a normally disused USB line.
USB 2.0 heads have a fifth 'unused' pin, specificly for manufacturers of devices to add in thier own proprietary signal line. By shorting the ground and a signal pin, via the resistor, you probably trigger a reset signal to the phones 'bios' rom.
And why 301k ohm? Probably, originally, to make it harder for non-samsung personel to 'guess' the correct trigger voltage. It could have easily been 235kOhm or 20M Ohm or anything.
This is conjecture honestly, but it makes sense to me.
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IIRC, the resistance is across the two USB data pins, at least for some functions, e.g. determining if you're plugged into an AC charger. There are several significant resistance values in the addition to the 301k ohm you cite. Other values will put the SGS2 into dock mode, or put the device into MHL mode, where the micro USB connector is repurposed to send HD video & audio to a display, either a MHL-compliant device or a HDMI device after going through the MHL-to-HDMI adapter.
Related
Hi, i need to return my phone to T-Mobile (UK) and i wanted to get it back to stock rom.
I've downloaded the Boke3 kernel and firmwire, so should be sorted in getting it back to stock kernel and stock rom (i think).
The only problem i have is the binary counter and resetting it.
Can i use the micro usb cable that came with the box to make the usb jig???
Just cut the micro usb bit off, and then reveal the 4/5 pins and add the 301k resistor.
Is that possible, please i need to know i have T-Mobile coming in the morning to pick up the handset to do a full kit replacement. (Morning is in 4 hours, HELP!!)
Yes u can.
There is a whole thread about it.
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Yep. just read the guide and attach the resistor accordingly
gl hf!
Hi mate - thought id post as i had to do this the other day..
I cut the plug off a micro USB, revealed pins 4 and 5, then held a 300k resistor to them, and that worked absolutely fine - it doesnt need to be 301k.
If you want something more permanent then Id suggest soldering though.
Good luck!
What cables can I use to plug a normal USB flash drive into my phone? I can't find a female to female USB to use with my photon USB cable. am I overlooking the obvious or is it not possible?
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w0lf215 said:
What cables can I use to plug a normal USB flash drive into my phone? I can't find a female to female USB to use with my photon USB cable. am I overlooking the obvious or is it not possible?
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I dont think it's possible. A computer reads the phone when it's plugged in but the phone doesnt read the computer so I dont see it reading a flash drive either.
Ive seen that you supposedly can, and would like to give it a shot. Here is an app that supposedly will, im just struggling with the physical aspect of plugging one into my photon..
I found one at Radio Shack.
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http://www.amazon.com/gp/product/B0...pf_rd_t=3201&pf_rd_p=1280661682&pf_rd_i=typ01
You can pretty much find anything on Amazon. I ordered one for $1.51 and no shipping
MikeyLee said:
http://www.amazon.com/gp/product/B0...pf_rd_t=3201&pf_rd_p=1280661682&pf_rd_i=typ01
You can pretty much find anything on Amazon. I ordered one for $1.51 and no shipping
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Thats a mini USB, not a micro. And all that i find that are indeed micro USB upon reading reviews appear to not be USB Host OTG cables. Can anyone confirm or deny if this will work for what im trying to do..? I *think* it will but want to confirm before ordering. thanks!
http://www.amazon.com/Micro-B-USB-C...ectronics&ie=UTF8&qid=1328238723&sr=1-1-spell
Gonna need to splice in a 5v power source as the Photon doesn't supply power.
w0lf215 said:
Thats a mini USB, not a micro. And all that i find that are indeed micro USB upon reading reviews appear to not be USB Host OTG cables. Can anyone confirm or deny if this will work for what im trying to do..? I *think* it will but want to confirm before ordering. thanks!
http://www.amazon.com/Micro-B-USB-C...ectronics&ie=UTF8&qid=1328238723&sr=1-1-spell
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Yeah I realize that now LOL I meant to post this one
http://www.amazon.com/USB-Micro-Fem...TRUO/ref=sr_1_1?ie=UTF8&qid=1328244310&sr=8-1
Lokifish Marz said:
Gonna need to splice in a 5v power source as the Photon doesn't supply power.
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Is this the case for external hdd powered by USB only? Or just normal USB flash drives also?
Most OTG capable devices (again I don't think the Photon is one) only supply about 100mA. This is barely enough to power flashdrives. Only low power flashdrives work, beyond that most usb devices that are powered by usb only will not even turn on.
In short if your usb device powers up and works using only an OTG cable, consider yourself lucky.
Can anyone confirm is the pinout of the Galaxy S3 Microusb is the same as the S2.
I would like to make a cable using a 365k resistor to trigger Car Mode, Charge the phone and send Audio out on D- & D+. I know this worked on the S2, I am assuming it will for the S3 as well, but wanted confirmation.
Thanks!
(Heres the S2 cable link I am refering to
http://forum.xda-developers.com/showthread.php?t=1395173&page=2)
Not sure about this but I read that the S2 Micro-USB Jig doesn't work with the S3 so this to me would imply something changed and so pinouts 'may' differ.
Hopefully someone else knows the answer for you.
Olywa
They're the same, the car mode cable I made works when I plug it into the S3
Excelus said:
They're the same, the car mode cable I made works when I plug it into the S3
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What value resistor are you using?
Olywa123 said:
I read that the S2 Micro-USB Jig doesn't work with the S3
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I dunno who told you hhis, but the same jig works across all Samsung Galaxy devices including the S3.
Some manufacturers use ****ty lowcost resistors with a high tolerance factor to which the s3 simply doesnt react but my homemade 301kOhm 1%tolerance jig works bust fine.
Btw one of the pins for the jig to work -the pin 5 - is never used in data cables.
The pinout is the same as alway and is a standarized MicroUsb-B female plug.
Only the MHL (hdmi) link which is also included in the same plug had it's pinout changed from S2
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My jig for sgs2 doesnt fit in my sgs3.
No iead if it work just simply wont go in :\
Anyone know wo ti fix a ptoblem like that?
I recently bought a s3 to repair and resell.
The phone has 2issues
Broken digitizer
The usb port doesn't charge or is recognized by the pc.
Does anyone know how i replace the micro usb port?
What i know:
it's not connected via flex cable, is soldered to the board. so will need soldering
To replace i need a hot air blower, my soldering gun has that function.
Please tell me more
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that's pretty much it. desolder the old one, solder a new one on there.
Does anyone have good resolution pictures of the usb port on the motherboard, so i could know what im getting myself into.
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yes, use google. hope you're familiar with SMD soldering
maxcoliban said:
Does anyone have good resolution pictures of the usb port on the motherboard, so i could know what im getting myself into.
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Here: http://www.ifixit.com/Teardown/Samsung+Galaxy+S+III+Teardown/9391/1
Good luck!
Glebun said:
yes, use google. hope you're familiar with SMD soldering
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Dear Glebun and other users,
I'm thinking of replacing the Micro USB port on my black GT-i9300. I've had charging issues some time now. First I had to some ' tricks' examples: Turning off, getting it to charge then turn on. Repeatedly jack the cable in and out. Rebooting and what not.
However now it wont charge at all. When plugged in to the wall socket it just stays at the level it is (when not using and screen off) when plugged in and using it the battery drains. Also my laptop won't reconize the device. (also won't charge when pluggen in the laptop).
I got this phone from my brother who has installed Cyanogenmod on it.
Now what kind of equipement do I need exactly? And do I need to work with some anti-static armband?
I am more interested in how you plan to fix the digitizer and make money on it?
Most usb cables work to charge my phone, but won't form a data connection with my xt910. I do have ONE that will. I thought it might be the cables, but they form a connection with other devices. Thought I'd mention, it says a usb is connected regardless of which cable I use in ap fastboot.
What is going on????
Also, I just got the usb port replaced thinking this was the issue... i don't get it...
I had this problem with a certain phone before it turned out to be the plug the part that actually goes into the phone was not long enough. you might want to compare the plugs length on the ones that work and dont
phi7ip said:
I had this problem with a certain phone before it turned out to be the plug the part that actually goes into the phone was not long enough. you might want to compare the plugs length on the ones that work and dont
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Ah, this is it! I guess Motorola makes their port deeper so that consumers have to buy their cables
Yeah just take a razor and carve off some of the extra rubber around the plug.
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have you checked adb shell options? (Once I experienced a similar situation and it was due to adb options)