[Shinshin]

Hi,

I am an owner of Hyundai A7HD for more than a month.
I tried stock firmware and then few ROMs, etc.
Everything was working great until the first time the battery ran out completely.
from then, the device stopped recharging the battery.
It works only when connected to the DC outlet (and usb, but usb doesn't supply enough power....).

Any ideas?
Anyone had a problem like this?

I tried to contact the seller and i am waiting for an answer...

Thanks!

[Ar Fei Lung]

Hi there,

I have tried that - Did you try the latest offical rom, or the Cherry Mobility Rom from mtr33?
I think actually the Cherry completely erase the battery rom, it does even better than the offical rom!
Try it and you won't regret.

[Shinshin]

Yes, I tried even that.
The problem is not with showing the correct battery %...
It is not charging at all...

[Ar Fei Lung]

So it only can be switched on with power connecting?
That means your battery is wrecked. You better get it repaired, I think...

[Shinshin]

I am afraid so...
I am working on getting it fixed or replaced.

[Ar Fei Lung]

Hey, i have read the offical frameware discription, i found that it said, '....fix stop charging' , so i think you can try the latest stock frameware or onix rom 0.4 that is based on that?

[Shinshin]

I have tried the latest firmware as well as the latest onix.
I'm afraid it is a physical problem...
I will send the tablet back to China later on this week for repair.

[pawaller]

I had a similar problem a while back with my A7HD, but it would not charge from the power connector OR the usb.
Really thought it was a hardware fault, but after reflashing the stock ROM it started working again.
Went back to CM9 and it has been fine ever since.

Phil

[avant]

... and I've had a similar issue - I've opened the case and I've unsoldered one lead to the battery. I waited 10min, so all capacitors got empty, then I resoldered the lead - et voila. I was able to charge the device properly again.

Cheers

Jo

[Shinshin]

avant, on 18 July 2012 - 03:18 PM, said:

... and I've had a similar issue - I've opened the case and I've unsoldered one lead to the battery. I waited 10min, so all capacitors got empty, then I resoldered the lead - et voila. I was able to charge the device properly again.

Cheers

Jo

As I haven't sent back the tablet, I am willing to try this.
I have opened the device before but wasn't 100% sure which leads goes to the battery.

Are those the red and black that soldered to the left of the battery?

Here is a photo of the tablet open (taken from the wifi mod...):
photo

Thanks a lot!

[avant]

Shinshin, on 18 July 2012 - 03:28 PM, said:

As I haven't sent back the tablet, I am willing to try this.
I have opened the device before but wasn't 100% sure which leads goes to the battery.

Are those the red and black that soldered to the left of the battery?

Here is a photo of the tablet open (taken from the wifi mod...):
photo

Thanks a lot!

yes - that's correct. Pls unsolder either the thick black or red lead.

Cheers,

Jo

[Shinshin]

avant, on 19 July 2012 - 04:06 AM, said:

yes - that's correct. Pls unsolder either the thick black or red lead.

Cheers,

Jo

Ok, it took me some time to get a soldering tool.
I have tried it few times, each time i thought i didn't let it discharge enough.
It was D/C for more than 3 hours at last try and it didn't help.

I didn't want to pay the shipping fees, so i contacted a battery seller on aliexpress and sent him the pictures of the battery.
He made a special sale for the battery that is compatible with the tablet.
I ordered one.
For those who think to replace a working battery and get better working time, I don't know if the ratings (mAh) will be as stated. My current battery is dead, so any working battery will be good for me.

link to the sale

Now, if anyone know how do I remove the battery? It is glued to the back of the screen...
I will update again...

This post has been edited by Shinshin: 07 August 2012 - 04:52 AM

[alexmartins]

I had a similar issue too! In my case the problem was solved after flash the 0424 firmware whit full format option via luvesuite.
Ps: Flash yhe last One firmware doesn't solve the probem. Only 0424 solve.

Sended from my Sony Ericsson "X10a" running Achotjan Stock Replacement v2.0 using Tapatalk.

[sgranapannocchie]

hello as i write in onyx topic u can try to recharge battery whit motorola v3 original charger or htc old charger via usb,my tablet was dead too for low battery and only way for revive it .after 2min usb charger mt hyunday is alive again,recommended after full recharge fix for battery whit app from play store.

[Shinshin]

Hi,

alexmartins - I have tried all firmwares... didn't work...
sgranapannocchie - I don't have one right now but I will try to get one and try.

Thank you both!

P.S. - Still waiting for my new battery to arrive...

[Shinshin]

Well, I received the new battery on the weekend. Unfortunately, it doesn't fit inside the tablet....
(I wrote to the supplier to inform him...)
Anyhow, I'm pretty sure that the problem now is that the tablet is not using the battery as a power source!
I tried soldering the new battery and the tablet behaves the same - shows full battery but when I unplug the DC power it shuts off immediately!
It won't power without being connected to DC power...

Guys, need more ideas!

[emmiejay]

hi,i am also having a problem with my A7 but do not understand a word you guys have said????? my A7 will not charge at all either by mains or USB, it just has a picture of a empty battery with a '!' in the middle. i have not had the tablet long and do not understand why this has happened, can you please help me but in idiot form please.

many thanks

pawaller, on 17 July 2012 - 02:54 AM, said:

I had a similar problem a while back with my A7HD, but it would not charge from the power connector OR the usb.
Really thought it was a hardware fault, but after reflashing the stock ROM it started working again.
Went back to CM9 and it has been fine ever since.

Phil

Hi Phil,

could you please explain this in more idiot form for me please as i do not understand, my a7 will not switch on or charge - please could you help.
thanks

[hnduy]

1. Tháo lắp lưng.
2. Dùng mỏ hàn tháo 2 đầu dây nối từ Pin vào main.
3. Hàn lại như cũ.
4. Bật nguồn điện.
Xong!

Edit by omarahum: When posting in the main forums, please include an English Translation. Thank you!

Google translation:
1.Removable back.
2. Use soldering removing the two wires from the battery to the main.
3. Welded back together.
4. Turn on the power supply.
Done!