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Author Topic: Hardwiring Power Connection  (Read 7551 times)

Offline josephallencavin

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Hardwiring Power Connection
« on: January 06, 2016, 02:07:36 PM »
I'm using a Sero7 Pro for streaming video. I would like to not worry about the battery and want to just hardwire a cord for powering.

Anyone do this or have an idea?
Pin outs for battery?
Anyone?



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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #1 on: January 06, 2016, 02:10:38 PM »





« Last Edit: January 06, 2016, 02:55:36 PM by josephallencavin »

Offline SagaciousKJB

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Re: Hardwiring Power Connection
« Reply #2 on: January 07, 2016, 01:43:06 AM »
Interested as well.

I am guessing the easiest way to do it would be to test the battery pack with a multimeter to find which carry current. I'm guessing the black will be the ground.

Then take the USB charger and cut off the USB connector to expose the wires. Should be able to find the 5v from a USB wiring diagram, and solder that and the grounds onto the appropriate connections to the battery.

I THINK it will work like thst but I am not an electrician of course. The battery PCB should handle the electricity flow between charging/discharging.



The guy who I took mine too charged the battery itself he said, it looks like he removed red wire on the end and the black on the other end to do so. They slip right out now.

I'm not sure what the other red and black are though.  They all read out 4.2 volts when I out a multimeter on them.



This seemed to  charge and run with it connected, but I did get a few random power offs
« Last Edit: January 07, 2016, 03:14:14 AM by SagaciousKJB »

Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #3 on: January 07, 2016, 09:26:27 PM »
Interesting...

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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #4 on: January 08, 2016, 12:24:01 AM »
My concern is if continually charging the battery would eventually burn it out and then the tablet not power on.

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Offline SagaciousKJB

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Re: Hardwiring Power Connection
« Reply #5 on: January 08, 2016, 01:04:16 AM »
Yeah I'm not sure how it would handle that, I hooked it up overnight and it didn't seem badly effected.

I don't think the tablet will even boot without the battery connected. Is your USB port still working on this one? I mean you should be able to just run it off USB power without a problem. The system will handle the charging/discharging.

Can you solder? Check out the wireless charging mod for this, it shows to areas by the USB port I believe you could solder the 5v from a USB cord on to and have the board basically treat it as if it were coming from the USB port. Just instead of the wireless charger, you have a hardwire.

http://forum.xda-developers.com/showthread.php?p=42203987



According to that link, the "red" wire is your + and the "black"  is -, and it seems like it's just completing the same 5v circuit that was on the USB port.

Edit

I wonder if those other little copper spots are also connected to the USB port. With a USB cord in the port and the leads all exposed, one could use a multimeter set on the Ohms setting to see which USB wire corresponds to which copper circle on the board, and then presumably could solder a new port wire by wire.

Anyway I used my USB cord thst is power only and confirmed the spots shown in n the picture do connect to the USB port, so soldering a 5v circuit onto those should be basically the same as having a 5v USB circuit in the port. Of course it will be a lot harder to solder onto the board than to splice into the battery wires.
« Last Edit: January 08, 2016, 02:34:31 AM by SagaciousKJB »

Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #6 on: January 08, 2016, 10:13:46 AM »
Yes,  USB still working as I just soldered one in. Need to redo when I get my solder paste but is working, for now.

I just would like to bypass the charging and having a battery. With constantly charging discharging, eventually the battery will die out.

I've also found that not all cables are the same. Some of my cables can charge while using tablet and some do not. Surprisingly, the cheap $1 short 40" flat cable from Dollar Tree, is capable of charging while using. I've decided that buying quality regular USB extension cables and cheap $1 cables is a better fix than buying micro cables. Buy several cheap cables and when one goes out toss and replace. Need it longer length plug in the extension.

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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #7 on: January 08, 2016, 10:50:57 AM »
That wireless charger is a great mod. Would like to do that to save on charging port wear.



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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #8 on: January 08, 2016, 11:08:21 AM »
Oh. As you may know, just because a cable is connected and showing as charging, doesn't mean that it is.

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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #9 on: January 08, 2016, 11:10:13 AM »
Was going to add some screenshots but it isn't allowing me to.

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Offline LuckyMe

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Re: Hardwiring Power Connection
« Reply #10 on: January 08, 2016, 02:51:44 PM »
that's an interesting set up!

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Offline SagaciousKJB

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Re: Hardwiring Power Connection
« Reply #11 on: January 10, 2016, 01:11:35 AM »
Was going to add some screenshots but it isn't allowing me to.

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When I hook up the wires like I did it actually doesn't show it charging at all.

What did you use to solder a new port on? I'd like to learn how to do it.

Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #12 on: January 10, 2016, 07:01:21 AM »

I didn't get it replaced well, need to redo. Just placed new port and heated with soldering iron. Didn't have soldering paste to secure it with. There are some good videos on replacing ports on YouTube. Best way is to use a heat gun instead of an iron but I don't have one nor the extra cash to buy one.

http://m.ebay.com/itm/3-X-Micro-USB-Charging-Port-Dock-Charger-For-Hisense-Sero-7-Pro-7inch-M470BSA-US-/121736184640

http://www.amazon.com/gp/product/B00M1RC0YY

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Offline josephallencavin

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Re: Hardwiring Power Connection
« Reply #13 on: January 11, 2016, 09:14:32 PM »
Soldered in three new charging ports today. In three of my tablets. All three working.

BUT...

While transferring a file, by Bluetooth, to a tablet that I've never had a problem with, nor ever worked on... It has become a brick.

WTF?

The only thing I've ever done to that particular tablet, is taking the cover off and charge the battery to put in another tablet.

Really bums me out after my replacing the charge ports in three other tablets and have the one that has never needed work to just die.



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Offline SagaciousKJB

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Re: Hardwiring Power Connection
« Reply #14 on: January 11, 2016, 11:34:52 PM »
So you just apply the solder iron to the port and it transfers enough heat through it?

That sucks about the other one, does it just not power on at all?