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[Q] Powering a TF-101 with a dead battery

I did something drastic today. I ripped apart the old TF-101 keyboard (already broken prior) to get at the battery pack inside, opened my son's Transformer, and swapped out the dead battery inside with the one from the keyboard, only to find out that... the other pack is just as dead as the one already inside the Transformer.
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I get the same red battery icon when I try to turn on the Transformer I just reassembled using the other battery. Now, I could in theory remove the battery from the second Transformer I have in order to do this, but opening up one of these things and extracting the battery is a non-trivial task to say the least, and I don't relish doing it again. A new battery is rather expensive, at around $40 + delivery, and to be frank I'd rather just spend that $40 as part of the cost of a new tablet. However, it turns out that there are some files inside that thing that I want to be able to recover (mostly photos and videos), so I'd ask what options I have for attempting to power up that thing one last time to extract the data from it. One way would be to use the working Transformer's battery, but that is obviously quite out of the question. I could put the thing on a lab bench somewhere (just assume that I have the facilities to be able to do this) and feed it with 7.4 Vdc along the same 8-pin header that the battery uses, to fool the tablet into thinking it had a working battery, allowing it to boot. What do the wires do, and what voltage levels should they have in order to make the tablet think it has a good battery?

There is a USB mod on the forums here somewhere to feed 1 USB port on your machine 12v instead of 5v using a 12v molex feed from the PSU, which allows charging from a USB port, which would also allow data access from the same port
I`ll post a link if I find it
EDIT - Could be here somewhere
http://forum.xda-developers.com/showthread.php?t=1087321

[Q] No signal after screen replacement: Damaged motherboard?

I was doing a screen replacement on a Nexus 5 and a small part from the motherboard fell off.
3 pictures to illustrate the problem here:
http://min.us/mKOC4FQe6F0HI
Afterwards, the mobile connection was a lot worse than before. Now, 2 weeks later, the phone's connection has become unusable and it constantly shows no service. Only very rarely does it have any sort of connection (Edge/3G/H/4G).
Questions:
1)What is the part that came off? (see album above) My knowledge is a bit limited but I'm quite sure it has to do with the connection? I notice there are 3 other parts exactly like this spread over the motherboard.
2)Can I repair it? Do I glue it back on? Do I solder it on? Does it somehow click on? (I have tried if it clicks but this part is so tiny it's almost impossible to really handle
3)Based on my explanation, do you think this tiny part is the only cause? The phone still had some connection at first but it got worse. I'm also planning to order replacement antenna cables to see if that helps.
Thanks in advance!

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In my case.. I had to replace the charging circuit Cuz it was 'broken' as described by the cellphone shop.. It has connections to the antenna.. Now phone is fully working.. Before that though, I tried different sim cards with different companies (bell Rogers and fido) all worked on my phone except my carrier sim card (mobilicity). After replacing the circuit I just mentioned everything works fine. Cost is 25$

Needs solder it's an rf trimmer /radio frequency. It's vital to an ariel of one type or other. If you want to risk a bodge assemble everything except the back and hold it in place with bluetack. If it works I was going to say epoxy it but don't. Get someone to solder it. It's easy to do if you have the skills.
Oh vital it's right way round and has now been turned. There should be a slot for tuning it.

Why do people like wireless charging?

I don't know if I'm the first one to say this, but I find wireless charging completely useless... I had an old '90s Motorola with a charging stand... I find that INFINITELY more useful than "Wireless charging".
First of all, the charger still has wires, so you're still stuck on a wall... Unless it has a battery attached to it, which is nice, though most scenarios where you use an on-the-go charger you are "on the go" and moving, so a normal external battery could do... (see third point)
Second. your phone is still during that time... You can't do anything to it... Why? Just so you don't need to put a wire in the port, to save some (1 second) time (?)
Third, it has ZERO stability. That's why I say that charger from 20 YEARS AGO was a lot better. You put your phone in and it charged. Same as Wireless charging, except that old Motorola didn't fall off and stop charging the second someone bumped into the table just a little bit. Or you are in a car...
I find wireless charging just good marketing taking charging a step back...
Also, the USB pins that keep the wire in my phone got crushed, so my phone right now can't be lifted while charging... PEOPLE ACTUALLY PAY FOR THIS???
PS: I found a "useful" use in cafes
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All you need to do is plug in the phone and "wirelessly" charge....

I can't see the appeal, either. I use my phone a lot whilst it's attached to the charging cable. You can't do that when you use a wireless charger.
My charging cable is 2 meters long. I can sit on the sofa and use my phone as an ereader or TV screen whilst it's charging. If I were to use a charging pad, I'd have to leave it on the table, which is not very convenient.
For me wireless charging is just a useless gimmick.

I find the potential of it interesting, rather than the current state that it's in.
It just seems a billion times more durable than the damn micro-usb port on EVERY Android device.
Maybe wireless charging is the solution, or maybe it's usb type-c.... we'll see i guess :]

Yeah I don't see the appeal either. Maybe it's good for coffee shops or restaurants where you don't use your phone anyways and it's lying on the table, so might as well get charged.

[Help] Recover data from a huawei mya-l41 with a damaged screen and an unstable USB connection

Dear XDA forum,
Short story:
- Phone (huawei mya-l41) felt into water
- Recover for some days after a good bowl of rice
- Screen stops working completely afterwards#
- Got the phone to get back data (Unfortunately no backup was made )
Tests:
1. Preparation for connection to the PC
- Installation of MTK65XXX while in Windows Test Mode due to unsigned drivers
- Installation of adb/fastboot from here: https://forum.xda-developers.com/t/...vers-15-seconds-adb-installer-v1-4-3.2588979/
2. Connection to the PC
- USB Connection is unstable => crashes after ~3/5s
- Screen is not powering on
- Phone has already been charged for 2 hours to ensure power is high enough
- Trying to put the phone in recovery mode, but I'm not sure if I could reach it
- Being able to connect to the UART Port by luck in that range via Terminus https://github.com/Eugeny/terminus
and I can see the output "READY" printed out in series, but I don't know what it means
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=> I tried to search on the forum with the keyword "READY" "ADB" "USB" but nothing interesting popped up
=> Searching in the Android source code will not help to, due to massive finds I guess
Any idea how I could proceed further?
Thanks a lot for any hints!

Rice may not work for drying phone. You'd better open it up and dried the sim and all that you could with a tissue. And you should also replace the battery if it has swollen.

bobii said:
Rice may not work for drying phone. You'd better open it up and dried the sim and all that you could with a tissue. And you should also replace the battery if it has swollen.
Click to expand...
Click to collapse
I've got the phone after some days (1 week I would say) when it was not working as it's not mine. I expect the phone to be dry since there. The person already bought a new phone, he just would like to get back the photos
Good point for the battery! But it seems the battery has not swollen

USB-C fault (cannot connect to PC or use Android Auto)

Hi all
Earlier this year my phone stopped working with Android Auto, and then more recently, I realised it wasn't recognised by my laptop for the purposes of moving files.
Around the time AA broke, I discovered my Belkin power bank had melted component on the circuit board (not sure which device caused it but presumably my pixel) and when the phone was plugged in the head unit showed the error "Overcurrent caution on USB" until I unplugged the phone. Never saw the message again but AA won't launch on the head unit now, phone still charges through the head unit. My phone still detects the charger type (still fast charges) and I bought a cheap inline voltage display and it shows the phone charging at the expected current for each type of charger.
I've done all the usual;
AA unit still works with my wifes Samsung A40, tried different cables for my phone. Uninstalled and re-updated AA, factory reset the head unit, (Sony XAV-AX100) and completely hard reset the Pixel 3a with no luck.
So I took the plunge yesterday and opened the phone up and fitted a new USB-C port...however, frustratingly this has not fixed the problem! I've put the phone back together but I'm reluctant to glue the screen back down before exhausting all avenues. Is there anything else that may have been shorted or damaged if the USB-C was faulty? I turned on developer mode and *I think* the phone should allow me to choose what to do when plugging the phone in (i.e. file sharing?) but it does not do this.
Any tips on further diagnostics or parts I should check would be appreciated
Thanks

I'm a little confused by my own sequence of events as it was several months ago and it was a couple of weeks before I realised it wasn't just a simple fix. I took a photo of the head unit error message and my phone is reflected in the screen and doesn't appear to be plugged in. So either the message remained after I unplugged the phone, or perhaps power bank was faulty and damaged the phone, I may have charged it from the head unit by mistake which detected the fault and protected itself (hence the message). Normally I wouldn't attempt to charge the power bank from the headunit, but the USB sockets are not far from each other.
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This is what happens when I try and transfer files via USB. The computer prompt comes up immediately and the phone charges, if I click the File Transfer/Android Auto option, after a few moment the phone greys them out

Just bumping this in case anyone has any advice, I've had the screen taped down temporarily but its vulnerable to water and damage like this so I think its time to admit defeat and glue it back together!