Can The Charging Port On A Nextbook Tablet Be Repaired

#1

IowaGuy

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Posted 16 February 2022 - 01:31 PM

Photo link: http://flic.kr/p/dVk9X3

Here is a photo (turns out I dont know how tp post a photo here!) of the inside of a Maylong m270 tablet. Information technology has a sheared off micro USB charging port. I am wondering of anyone knows what terminials I can utilise to recharge the battery. The tablet says its expressionless. In the photograph going from left to right starting with the rectangular blank terminal is labeled B+. The red wire is labled P+, Blue wire is T, Blackness wire is P-, and the other blank is B-. If put my volt meter on the terminals I become:

B- to B+ is 4.8v

B- to P+ is 4.8v

B- to T is 4.4v

B- to P- is 4.4v

Whatever combo of the 3 center terminals I get 0 volts.

Obviously the battery isnt dead, but the part the tablet uses must be. The back side of the battery pack says 3000 mAh 3.7 volt.

If any one knows what terminals demand to be used to charge I'd appreciate it!

Edited by IowaGuy, 17 Feb 2022 - 12:16 PM.

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#2 Uncle Rim

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Posted 17 February 2022 - 03:00 AM

If yous programme to attach wires to accuse the battery, you might be ameliorate off looking at the USB connection rather than the battery connectedness. The USB standard is pin ane is +5V and pin v is the ground. Pins 2 and iii are data. Pivot four is either continued to pin v in type A and unconnected in type B.

At a judge, P+ ways power positive and B- is battery negative. The red and black wires ostend this (not that standards are closely followed internally these days). These probably have close enough to a direct connection but connecting here will bypass any charging circuits and could lead to over charging the battery.

I can't imagine how an internal socket got sheared off. Perhaps I don't want to know!

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#iii IowaGuy

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Posted 17 Feb 2022 - 12:15 PM

My approximate is the guy or kid dropped information technology while the charger was plugged in and landed correct on that side. I was gonna try to re solder the port back in merely concentrating on the pos and neg terminals, only there just isnt enough there and far to small to do it. Plus it took part of the circuit board with it. I realize I could over charge the bombardment, only programme to be conscientious and hopefully tin can just watch the battery indicator ascension.

I become 4.5 volts at the terminals P+ and B- that you said to charge from. (I just realized in the original post I had the black wire labeled every bit B- but I meant P-. I become zero volts at those two.) Did you mean to use the crimson and black wires to charge from? Does the tablet still consider the battery dead at those volts? Or is it more of an amps matter. I cant remember how to measure out those anyhow!

Cheers for your input!

Edited by IowaGuy, 17 Feb 2022 - 12:20 PM.

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#4 rotor123

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Posted 17 February 2022 - 01:25 PM

Hi, This might aid.

Inserting An Epitome Within A Mail service

http://www.bleepingcomputer.com/forums/t/14738/inserting-an-image-inside-a-mail/

Promise this helps

Roger

Edited past rotor123, 17 February 2022 - 01:26 PM.

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#5 Uncle Rim

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Posted 18 Feb 2022 - 05:47 PM

Sorry for taking so long to go back to you.

The tablet should non be declaring the battery dead at four.5V. This is college than the nominal capacity of the bombardment, usually 3.vii - iv.2V. I would suspect that the part of the board which broke off contained more than than just the USB port. In order to attain the small size, multilayer boards are used with connections running through them.

I wouldn't exist concerned most the lack of voltage on charging points. There is probably a diode to forestall the charger taking ability from the battery. Information technology also serves to prevent reverse polarity if a faulty charger is used.

At this stage, just connect the charger to the posiitive and negative y'all find. It doesn't sound like you hjave much to lose!

#six IowaGuy

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Posted 18 Feb 2022 - eleven:17 PM

Ok i final question, and thank you for your input! Y'all are correct that I dont accept much to loose! Well except the 100 bucks ebay Buyer protection screwed me out of!

What spots do you recommend I attach to? Originally you had said P+ and the B- that I miss labeled. Are you thinking the red and black wires that are P+ and P-? Correctly this time, from left to right I take:

B+, P+, T, P-, and B-

#7 Uncle Rim

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Posted 19 February 2022 - 07:14 AM

The Pand B connections essentially connect to the battery and either will provide accuse. The difference is the P connections have protection that I described in the previous postal service. If you lot are certain about polarity, either volition do. I have no idea what the T connectedness is (perhaps a thermister to prevent overheating?).

You lot have measured 4.v volts in circuit. Even though this is without load I would look the tablet to kick with that. You can try futher charging the battery, merely I don't feel this volition achieve anything. While you are down a hundred bucks, a few minutes soldering is worth a endeavor.

It is most impossible to break the USB connector off the lath by dropping the tablet. The cable is thick enough to concur the tablet then that the other side will hit the flooring outset. There is something more sinister in the history of this tablet.