I'd like to use aging HD10s as connected displays.
Unfortunately, as the batteries go bad the devices fail to boot (stuck at "MT65xx Preloader" - which is expected because unplugging the battery is a known way to get to preloader).
1. From a hardware perspective, can the HD10 operate with just USB power?
2. Can I send a command to the preloader so it will continue booting?
3. What pins/protocol would I need to implement to convince the preloader that there is a battery attached?
dirtminer said:
I'd like to use aging HD10s as connected displays.
Unfortunately, as the batteries go bad the devices fail to boot (stuck at "MT65xx Preloader" - which is expected because unplugging the battery is a known way to get to preloader).
1. From a hardware perspective, can the HD10 operate with just USB power?
2. Can I send a command to the preloader so it will continue booting?
3. What pins/protocol would I need to implement to convince the preloader that there is a battery attached?
Click to expand...
Click to collapse
buy new battery, or you can mod via old smartphone battery connect to fire hd battery's circuit board
Related
Has anyone pulled off using getting USB OTG+Charge mode working on the SHIELD?
I tried to splice in the 5VDC line from the SHIELD charger to a regular OTG cable, and while the charging light on the back of the device lights up orange and the data port works (a connected mouse works fine), Android does not report the device is charging :S Sometimes some devices have needed a resistor across certain pins, but I'm not sure what to try out on the SHIELD yet.
Would be nice to enable this under the TV in console mode, would get GRID streaming, PC streaming over my wired network rather than wireless, as well as all my emulators etc.
I stumbled upon a similar issue but with nexus 7, and there laid the answer. The micro-controller that is capable of switching usb port to OTG mode and backwards in nexus 7 is capable of powering one device at a time. Battery or the one connected through OTG.
Theoretically in nexus 7 it's possible to modify kernel to power it's battery instead instead in OTG mode, and through some powered USB hub, provide power to the external device.
Or to re-solder pins, but its not worth imho.
We can assume that the issue with Shield is similiar.
But we won't be sure until s1 finds Shiled's USB OTG micro-controller tech specs.
Subscribing in the hopes that this will be possible in future
I think If you had something similar to http://www.amazon.com/OEM-UTStarcom...&qid=1392490266&sr=8-1&keywords=usb+y+adapter you could use the charger to power both you usb device and the shield. It will just need to connect power to all 3 ends.
chevyowner said:
I think If you had something similar to (...) you could use the charger to power both you usb device and the shield. It will just need to connect power to all 3 ends.
Click to expand...
Click to collapse
If i am not mistaken in how shield is built - not possible.
Gamperuss said:
If i am not mistaken in how shield is built - not possible.
Click to expand...
Click to collapse
Unless there are diodes on the usb connector on the shield that will prevent power going into the shield while in usb host mode, I do not see why it wont.
I already tried something like this: putting 5V on the power pins when the shield was in OTG mode. Didn't work, the SHIELD didn't recognize the charge in software.
vostok4 said:
I already tried something like this: putting 5V on the power pins when the shield was in OTG mode. Didn't work, the SHIELD didn't recognize the charge in software.
Click to expand...
Click to collapse
Another idea I have for this would not allow charging but it would slow down the rate of battery drain.
I doubt you would find this cable premade, but instead of applying power to the usb otg circuit it would only connect the 2 data wires to the shield, and the 2 power wires to the wall charger. That should allow your usb device to be powered by the wall charger and no the shield allowing the battery to last longer.
Yet another possibility is to add a diode in to circuit to only allow power to flow into the shield on the 5v+ line.
Just an update, support for charging while in OTG is announced with the April update! http://www.geforce.com/whats-new/articles/gtc-2014-nvidia-shield-software-update-announcement
So no hacks needed
Damn,... all the good stuff happens after I've sold my Shield
Can anyone verify this works out of the box now? USB-OTG host mode while the tablet is fast-charging?
I'm looking at doing this for my in-car installation, I posted this over on the geforce forums:
https://forums.geforce.com/default/topic/812455/shield-tablet/shield-in-car-installation-/
Hello all,
I've got a 2012 edition of the Amazon Kindle Fire HD (tate) which I love . Unfortunetly, while doing a bit of DIY modding, I was forced to resort to using my handy fastboot cable. I can boot the tablet into fastboot, but upon plugging in my normal USB cable, my laptop tells me that "the connected USB device has malfunctioned, and Windows doesn't recognize it." I posted a thread in my device forum (http://forum.xda-developers.com/showthread.php?t=2750416), and this was the reply:
Ouch, I think I have seen this before, not positive but I,m guessing your fastboot cable shorted the chip in charge of USB related stuff.
Click to expand...
Click to collapse
My question is: is this something I can fix or replace myself, or am I better off saving for a new tablet? If at all possible, I'd like to try and fix it myself, as it's been a sturdy and reliable little 16 GB tablet, and it's been there through the good and the bad of the past couple of years.
Regard,
--Ph0enix_216--
...bump?
Hello everyone,
A couple of weeks ago my USB data connection on my OnePlus One has stopped working.
This means that no connection is even detected on any computer.
This is not a driver issue as the computer doesn't even notice anything has plugged in.
I think it's not a software/ROM issue because the same applies to fastboot mode and recovery mode - no data connection, no "usb plugged in" sound on any computer, no device showing up.
It's also not a cable issue, as the same cable works on other OnePlus One's and I've tried many different known-to-be-working cables.
More facts:
1) When plugging to a computer USB port - the battery icon shows the charging (lightning) symbol for a half a second and disappears and it won't charge. The computer, of course, doesn't see a usb device plugged.
2) When connecting to an AC charger - it charges just fine.
3) I already tried replacing the dock connector and flat cable unit with a new one - did not solve the issue, which means the dock connector is fine.
Any insight on this will be greatly appreciated!
Thanks!
purpleman2k said:
Hello everyone,
A couple of weeks ago my USB data connection on my OnePlus One has stopped working.
This means that no connection is even detected on any computer.
This is not a driver issue as the computer doesn't even notice anything has plugged in.
I think it's not a software/ROM issue because the same applies to fastboot mode and recovery mode - no data connection, no "usb plugged in" sound on any computer, no device showing up.
It's also not a cable issue, as the same cable works on other OnePlus One's and I've tried many different known-to-be-working cables.
More facts:
1) When plugging to a computer USB port - the battery icon shows the charging (lightning) symbol for a half a second and disappears and it won't charge. The computer, of course, doesn't see a usb device plugged.
2) When connecting to an AC charger - it charges just fine.
3) I already tried replacing the dock connector and flat cable unit with a new one - did not solve the issue, which means the dock connector is fine.
Any insight on this will be greatly appreciated!
Thanks!
Click to expand...
Click to collapse
By dock connector, you mean the USB port? Typically, this issue arises when the pins in the USB port get damaged. I don't know how the rest works out, but if that particular section of pins have to communicate throughout the rest of the motherboard, perhaps the trail responsible for that may have somehow gotten damaged. This is a clueless theory, someone with more electrical/motherboard experience can verify this.
What I do know is that once the micro USB port has been replaced on the phone, the issue should be fixed. It happened to an S3 I still have and I got it replaced by a friend. Sadly, it happened to me at the wrong time since i had wiped the entire OS and internal storage and was relying on my USB OTG cable and a flash drive which contained a rare rom called Sonic Open Kang Project (SOKP).
DO NOTE that this has also been an issue with me on the software side of certain devices. I uave had practically every flagship device out there and have come across a point where this happens on both stock and custom roms. My Optimus G did it on custom roms, and my Nexus 7 2012 occasionally on stock. There were other devices I cannot remember but sometimes factory resets or replacing the rom helps. However, you did state that the result is still the same on fastboot/recovery, so this seems to be more on the hardware side.
I replaced the USB connector (including it's flex cable) entirely. Did not solve the issue.
What else could be wrong?
try again
purpleman2k said:
I replaced the USB connector (including it's flex cable) entirely. Did not solve the issue.
What else could be wrong?
Click to expand...
Click to collapse
Try another computer. See if you can get any response from adb.
pbergonzi said:
Try another computer. See if you can get any response from adb.
Click to expand...
Click to collapse
I tried a lot of different computers and cables. None of them detect a USB connection.
Again, to clarify - they don't even SEE a usb device has been plugged in.
recovery?
purpleman2k said:
I tried a lot of different computers and cables. None of them detect a USB connection.
Again, to clarify - they don't even SEE a usb device has been plugged in.
Click to expand...
Click to collapse
You running a custom recovery? If so, see if you can toggle the mtp on/off reboot with each back to recovery. Use the tools to check the filesystem, permissions, etc.
Could pins have damaged?
Well, I did replace the USB connector with a new one, so if pins are damaged it's gotta be on the motherboard side, and I can think of no reason why that would ever happen.
As for recovery, I'm running TWRP and I'm not sure I understand what you meant I should try. Can you elaborate?
Thanks
Hey everyone,
My Nexus 5 wont charge or even be recognised by a computer. I am, however, able to successfully charge it via the wireless charger though. I have replaced the usb flex, thinking this was the problem, but it still wont charge, and windows wont detect it.
When attached to the wireless charger, flashes red, until it has enough power, then starts up and boots directly in to fastboot mode with it automatically cycling through the options.
Any ideas why this would be? Is there a fuse on the main motherboard or something that could be affecting this?
Possible power button issue which would explain the phone automatically cycling through fastboot options?
Possibly damaged USB connector on motherboard?
Anyone know of a solution or maybe a custom rom that has this feature support?
Or wireless charging maby
datder said:
Anyone know of a solution or maybe a custom rom that has this feature support?
Click to expand...
Click to collapse
Technically it does not make any sense. your device switches to host mode when you plug in an usb stick or sth else. such devices won't deliver any power to your device. but on the contrary such devices need a power source or won't do anything. if your device don't deliver power to a USB stick you won't be able to read/write any data of/to it.
WoKoschekk said:
Technically it does not make any sense. your device switches to host mode when you plug in an usb stick or sth else. such devices won't deliver any power to your device. but on the contrary such devices need a power source or won't do anything. if your device don't deliver power to a USB stick you won't be able to read/write any data of/to it.
Click to expand...
Click to collapse
That doesn't make any sense. So no power in USB host? What about the hundreds of devices that do it, like a cheap fire tv? Many devices would be rendered useless without this ability.
Reason phones dont have the feature is due to having a battery afaik.
TimmyP said:
That doesn't make any sense. So no power in USB host? What about the hundreds of devices that do it, like a cheap fire tv? Many devices would be rendered useless without this ability.
Reason phones dont have the feature is due to having a battery afaik.
Click to expand...
Click to collapse
You know what host mode means? Your phone enters the host mode when plugging in an USB stick or sth else that gets connected by an OTG adapter. Should the USB stick charge my phone??
If you connect two phones then the used cable/the order they get connected will decide which one enters the host mode and powers the other device.
...and if you connect your phone with a PC/laptop/TV/Bluray/Hifi then your phone gets charged because your phone isn't in host mode then.
WoKoschekk said:
You know what host mode means? Your phone enters the host mode when plugging in an USB stick or sth else that gets connected by an OTG adapter. Should the USB stick charge my phone??
If you connect two phones then the used cable/the order they get connected will decide which one enters the host mode and powers the other device.
Click to expand...
Click to collapse
Do you know what a charging OTG cable is? USB stick and charging... What are you talking about?
TimmyP said:
Do you know what a charging OTG cable is? USB stick and charging... What are you talking about?
Click to expand...
Click to collapse
What are you talking about? idk...
Using OTG and charging can work simutaneously, technically... But generally devices don't support that... When you connect OTG, phone goes to host mode and provides power to external device... When a charger is connected, it goes to client mode and can receive power... There are hubs out there that have USB ports, as well as charging port that claim to charge your phone while using devices connected... But they don't work on all devices... I had a tablet long time ago, and it did not support that... It would either charge, or go to OTG mode, but not both....But some folks with different tablets claimed to have that hub working both as OTG as well as charger simultaneously... As far as tablets are concerned, my guess is that this feature could be available more frequently since the need to use keyboard/mouse/other external devices is more for tablets than it is for cellphones... So I think it would not be possible with OnePlus 9's kernel...