Desperate need. Crashed my bike. Phone started flickering now its black. - Redmi K20 / Xiaomi Mi 9T Questions & Answers

It charges. The alarm goes off in the morning. But the screen doesnt respond and at first it was flickering toward the bottom. Now its black.
Ive torn it down about 50% and dont see anything wrong. The connections seem fine.
There are three photos on the phone I must have for work. Must.
Ideas on repair? Or data recovery? When I plug in the usb to pc I hear the noise and I know its asking 'charge', or 'transfer files'. Without screen response I can do nothing.
Any assistance to get it working or data recovery would be hugely appreciate.
Edit: The glass is not cracked or broken. Ive dropped it literally 100 times. In the first month I fell and sat on it breaking the back cover. I replaced that. That was 2 years ago. Some background of the device.

You destroyed lcd, so replace it or use o Mouse with otg usb c adapter and try to change connection to file transfer

yaro666 said:
You destroyed lcd, so replace it or use o Mouse with otg usb c adapter and try to change connection to file transfer
Click to expand...
Click to collapse
otg usb c adapter. I have the usb c cord. otg adapter is something I need to get I take it. Thanks for responding.

The important thing is you're ok. Lol, all my bikes are worth more than my phone... I hope yours isn't too damaged.
Try disconnect/reconnecting the battery and reboot; a hard reboot.
If you're lucky a ribbon connector, or ground pathway was displaced.
Either the display is damaged and/or the mobo.
The BGA chipsets can't have their solder joints inspected and even finding visible solder cracks is difficult on surface mount components. High G impacts and excessive flexing can internally damage chipsets, solder joints and multilayered PCBs.

blackhawk said:
The important thing is you're ok. Lol, all my bikes are worth more than my phone... I hope yours isn't too damaged.
Try disconnect/reconnecting the battery and reboot; a hard reboot.
If you're lucky a ribbon connector, or ground pathway was displaced.
Either the display is damaged and/or the mobo.
The BGA chipsets can't have their solder joints inspected and even finding visible solder cracks is difficult on surface mount components. High G impacts and excessive flexing can internally damage chipsets, solder joints and multilayered PCBs.
Click to expand...
Click to collapse
A damaged lcd will flicker, not respond and go black? The glass is not cracked or broken.
The glass and digitizer are one piece it appears.
Amazon.com
So far Ive found no ribbons disconnected. Ive inspected as close I can all visible connections. Nothing stands out.
A lcd arrives tomorrow. So well see if I get a response when I plug it in...

Like tv, if you punch lcd it won't shatter, the crystal will flood or it just flicker, so yes it doesn't have to be damaged visibly to be broken

maluminse said:
A damaged lcd will flicker, not respond and go black? The glass is not cracked or broken.
The glass and digitizer are one piece it appears.
Amazon.com
So far Ive found no ribbons disconnected. Ive inspected as close I can all visible connections. Nothing stands out.
A lcd arrives tomorrow. So well see if I get a response when I plug it in...
Click to expand...
Click to collapse
The battery may have been damaged, keep that in mind. Make sure the phone has enough voltage and current to run.

XDA is awesome. You guys are the best. You may have thwarted an injustice. Saved the files. New lcd heated and I have clamps on it so it seals, hopefully. The frame was slightly bent which was making it hard to keepit on. Im on the home stretch I think.
edit: What to do with an old lcd...
Next project - unbricking an lg stylo 4 with the ch.co message.

yaro666 said:
You destroyed lcd, so replace it or use o Mouse with otg usb c adapter and try to change connection to file transfer
Click to expand...
Click to collapse
I have the same problem... screen is black but I can hear it connect to windows plus the flashlight works, how would I use the mouse to change connection to file transfer? thx

Like you have to try - blind shot. Usb mouse and usb c usb adapter. Slide down notification and try clicking.

yaro666 said:
Like you have to try - blind shot. Usb mouse and usb c usb adapter. Slide down notification and try clicking.
Click to expand...
Click to collapse
Practice makes perfect... a template would help.

Related

self repair universal

Hi, I broke my universal last night :.(
I was using a charger that came with my gps, and it fell 30cm off the bed table and hit the floor, striking the charger cable. The gps charger is longer, so without the rubber collar to absorb the shock, the usb plug twisted inside, and broke the usb connector off the motherboard.
pics: http://boldra.com/images/universal/
I use my universal very heavily, so I want to get it fixed as soon as possible. I've done simple repairs on laptops and phones before, including soldering on a power connector in a dropped vaio. How would people rate the difficulty of this one?
The first issue will be to get hold of a suitable screwdriver, but I'll also have to source a new usb connector.
Has anyone got any experience or tips they could share?
Thanks!
Boldra
Boldra said:
Hi, I broke my universal last night :.(
I was using a charger that came with my gps, and it fell 30cm off the bed table and hit the floor, striking the charger cable. The gps charger is longer, so without the rubber collar to absorb the shock, the usb plug twisted inside, and broke the usb connector off the motherboard.
pics: http://boldra.com/images/universal/
I use my universal very heavily, so I want to get it fixed as soon as possible. I've done simple repairs on laptops and phones before, including soldering on a power connector in a dropped vaio. How would people rate the difficulty of this one?
The first issue will be to get hold of a suitable screwdriver, but I'll also have to source a new usb connector.
Has anyone got any experience or tips they could share?
Thanks!
Boldra
Click to expand...
Click to collapse
Hi first of all, based on my experience with opening universal - when you start opening PLEASE READ OPENING INSTRUCTIONS on FTP - there is PDF file for this. And second one - try ty find a cheam MP3 player with same USB connector - you will never belive what is inside of those tousands MP3 players - I even find inside one a DiskOnChip for universal
Thanks, they look like two very good tips! I was actually going to check out the second hand shop for old cameras with mini-usb connectors, but mp3 players sound like a good idea too.
Boldra
I had the same problem. I fixed it myself too. I just used the USB connector that was broken off and soldered it back.
I don't think a new connector is going to be needed. More likely your biggest problem will be broken off tracks on the motherboard.
Thanks Patrick, I love the net! I've never personally met anyone with the same device, but now here I am talking to someone who's actually had exactly the same problem!
I've now opened the case up (after downloading the beautiful maintenance manual), and it looks like there are indeed a couple of bits of the mobo broken off and stuck to the connector.
I've had a look with a magnifying glass, and it looks like the 4th connector in particular is going to be difficult to match up. I've been checking out the USB spec, and, if I'm reading it right, this connector is only used for a usb hub. I think on the universal it's not actually connected to anything. Really, I'll just be pretty happy if I can just get connectors 1 & 5 joined up again, so I can recharge!
The other thing I'm worrying about is how I can firmly attach the connector back onto the board so that it doesn't easily break off again. I'm considering a drop of superglue to fix the usb connector onto the mobo before starting the soldering. How did you solve this problem? Are you relying entirely on solder to take the load?
Boldra
Boldra said:
The other thing I'm worrying about is how I can firmly attach the connector back onto the board so that it doesn't easily break off again. I'm considering a drop of superglue to fix the usb connector onto the mobo before starting the soldering. How did you solve this problem? Are you relying entirely on solder to take the load?
Boldra
Click to expand...
Click to collapse
Don't even think about it !!! If you put some glue there you can say goodbye to your device if it brokes again you cannot protect device from this - is more cheap to repair him again
You should put this warning up:
Warning, HORROR pictures ...
must be over 21 to watch ...
Boldra said:
Thanks Patrick, I love the net! I've never personally met anyone with the same device, but now here I am talking to someone who's actually had exactly the same problem!
Click to expand...
Click to collapse
If you search the forum here you will notice there are hordes of people with the same problem. It's safe to say this is a design flaw of the Universal.
Boldra said:
I'll just be pretty happy if I can just get connectors 1 & 5 joined up again, so I can recharge!
Click to expand...
Click to collapse
Same here. I stopped messing with it when it started charging again. It doesn't connect through USB anymore, but I can do that via bluetooth as well.
Boldra said:
The other thing I'm worrying about is how I can firmly attach the connector back onto the board so that it doesn't easily break off again.
Click to expand...
Click to collapse
I put some extra solder on the large pads on the side. I have a feeling that that helped put it on the board more sturdy. I also changed the way I use the Universal. Before I would use it with the charge cable atached so the battery would stay full. Now I never move it around when the cable is attached. So now when the Universal is charging, the first thing I do is take the charge cable out and then open the unit and switch it on.
superglue will not work. you must solder it back on.
from those pics it's impossible to estimate the damage.
open it up and take some new pics.

USB CAP

Hi, there are lots of posts about damaged USB ports. I was wondering does anyone saw or uses any cap for USB. It should be something like rubber SD cap. Just plug it into USB and you can reset the phone in complete darkness . And it could be attached to leash loop with little thread not to lose it while on charge/sync. That would also prevent dust from accumulating inside USB port. Anyway I couldn't find anything like that. Maybe some DIY ...
I was thinking the same thing cause i am having to replace my tilt due to breaking the usb port with the stylus. I would love any ideas on how to do a cover.
bump..
sounds like something that should of came with the phone..
This would be a great idea since I have to realign my usb port every once in a while. The only way I can sync with my computer is by using the HTC USB Headphones adapter that came with my 8525. AT$T said that they would not exchange my Tilt for a new one because bent pins are not covered under their warranty due to "personal damange". It's really weird that I can't use my Seidio Cradle to sync with my computer anymore since it has the same proprietary USB jack. It will only charge the unit and if I move the Tilt while plugged in to the cradle, the connection is not always consistant.
healingtouch84 said:
I was thinking the same thing cause i am having to replace my tilt due to breaking the usb port with the stylus. I would love any ideas on how to do a cover.
Click to expand...
Click to collapse
Haha. I thought I was the only one. Went to do a soft reset, wasn't looking, and stabbed the USB by mistake. Didn't notice it wouldn't charge until the next day. Fortunately, I was able to bend the pin (GENTLY) back into place and it works again. BIG sigh of relief

wizzard wont sync

hey all these days my wizard would sync perfectly but today it jsut charges and doesn't sync i did a hard reset but still don't work .. i tried in a different computer and it doesn't even identify it
anyone have this problem???
had the same problem. all days it worked and then suddenly just charging (no sync, no identification). I also did a hard reset but this changed nothing. then I did not use my wizard quite a while (about 3 months)...tried it again and it worked perfectly fine. i have no idea where the problem was...so mate I have no idea how to solve it but you see...there was a happy end
I just got given a Wizard and it's got this problem too, charging but no sync. Problem with mine looks like a damaged mini USB connector. I can see that the plastic in front of one of the pins on the bottom of the phone is broken.
This thread http://forum.xda-developers.com/showthread.php?t=300240 has some suggestions on where to get replacement connectors.
biofidius said:
I just got given a Wizard and it's got this problem too, charging but no sync. Problem with mine looks like a damaged mini USB connector. I can see that the plastic in front of one of the pins on the bottom of the phone is broken.
This thread http://forum.xda-developers.com/showthread.php?t=300240 has some suggestions on where to get replacement connectors.
Click to expand...
Click to collapse
how easy is to replace this connector.
i have replaced the screen and got all the way down to the MOBO but i didnt see that mini connector.
edit: i meant i did see the connector but its soldered to the MOBO so i was wondering if this can be replaced.
im having the same problem
In the forum link I posted above people have said that you can damage your MOBO easily if the PCB gets too hot when soldering.
I have access to a hot air tool used for SMD components, which lets me heat all the pins on the mini USB connector evenly. Using a soldering iron would be more difficult and increase the chances of damaging the MOBO.

help pls, phone not charging ( not battery point)do i take phone apart?

need help please people.
my phone hasnt been charging properly for a few days now, to get it charging now i have to get one of my missis hair bands and wrap it round my phone and then round the usb cable so it stays in , although today it doesnt want to charge at all now .
ive noticed that the connection in the phone is loose and you can move it round a litle bit,
now the bit i need help with , is do i take the phone apart and try to fix it.?. im thinking of doing this but unsure about taking phone apart ( dont think my phone is under warrenty anymore,) and im guessing the usb connection on the phone is fixed onto a board.
is it worth me trying that or should i just take it to a repair shop ?
take a dry toothbrush, give the usb port a good scrub. dirt often builds up in the bottom of the port and stops the usb plug pushing deep enough to get a good contact.
Have a good inspect of the usb port, bright light and magnifier is good, see if you can see buildup, or a bent connector, or somesuch.
Also look at the usb plug on the cable, its uncommon but not unknown for the metal outer enclosure to open slightly, and make for a weak contact.
Sometimes a cable simply doesn't fit well for no obvious reason, , i have a generic cheap ebay cable that will only work when angled up or down, like yours, but looks perfectly fine, and feels to fit the socket, while the HTC cable works perfectly, so i know its not the port.
If it all looks good, then chances are you have a dodgy connection from the usb port to the mainboard, which will get worse every time you wiggle and bend the cable to get it to work. In this case, you COULD try a repair, but there have been reports on here of some repair shops pronouncing it too fiddly to replace teh usb port, and a new mainboard would be the only other option.
edit - just reread your post and seen that you can wiggle the port. Broken solder, gotta be. Its not an easy solder, so if your a dab hand, then go for it, if not, see above.
Hi iainbp, heresandyboy had this same trouble in http://forum.xda-developers.com/showthread.php?t=903977 from post 16.
It looks tricky!
Just a thought though, I recently bought a cheap phone charger with multiple interchangeable heads for different phones. The microUSB one became difficult to charge with and it took me a while to realise that the metal bit at the end had detached from its plastic casing, and when I plugged it into the phone it just got pushed back into the casing. (got my money back)
Possible with yours?

USB connector not sitting snuggly in the USB port?

Occasionally since I got the phoone I've noticed that the audiobooks I've listened to have suddenly stopped, and prompting me to press play again; it always seemed to happen when I had a hand in my pocket, so I probably just assumed I had touched the screen or something. It was annoying, but I just continued on.
Then late last week after it happened while I was at my desktop and just moving the phone, I investigated a bit more closely.
I found that I could wiggled the headphone USB dongle, and the fit was not as solid as you'd expect (of course, I hadn't really checked this earlier, just putting in and taking out USB connectors up to this point). As I wiggled it, the audio would stop as if my headphones were disconnected and reconnected. Which must've been what had happened before.
Then I checked with my charging cord. Same kind of fit, I could wiggle the connector a few degrees. Enough for me to raise some concern about it being a faulty USB port, or it having somehow gotten loose in the shell.
This is probably RMA worthy, I'm guessing. The question is what will OP do? Replace the whole phone? Repair it (repair what exactly, I'm wondering)? I've not dealt with their support before, and I couldn't really find any suitable thing under their repair service categories.
Could some people check how snug their USB connector fit is and report back to me, so I could find out if this isn't how it's supposed to be?
First check your USB port for lint. I typically use a needle to clean mine out (Don't short any of the pins if using a metal needle). Lint will prevent the cable from fully seating and cause it to feel loose.
OhioYJ said:
First check your USB port for lint. I typically use a needle to clean mine out (Don't short any of the pins if using a metal needle). Lint will prevent the cable from fully seating and cause it to feel loose.
Click to expand...
Click to collapse
The USB port is totally clean. Couldn't even spot any dust particles under a bright light.
I know the 3.5mm headphone jack isn't technically rated for as many cycles as a USB C connector but I still feel it held up to abuse like being in a pocket better than any type of USB connector.

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