Replace AMOLED with LCD - Redmi K20 / Xiaomi Mi 9T Questions & Answers

I have a Mi 9T that took a dive on its corner breaking the display which has degraded from unreadable half a display to black while being tasked to recover some data. Due to the phone not being used afterwards investing in a new screen is not really worth it but due to every option for me to see what is actually happening on screen and every option to remotely retrieve data is turned off it seems to be the only way. Now there are both AMOLED and LCD screens available, but it is not really clear to me if a LCD will just work directly, as it has no fingerprint scanner and probably different drivers.
They are half the money so if it gets me a working screen to enable remote access it is all I need.

Maybe have a repair shop retrieve the data be a better option. Any impact hard enough to damage the display can damage the mobo too.
Always redundantly backup critical data...

I just wanted to know if the display is an option, before I order one and take it apart to see if there is any more visible damage. It is not critical data, hence the cheapest option to retrieve it is the last resort at the moment. It should have been back upped but for some reason it turned out some stuff was not the last month or so.
It does still work, as I'm waiting for the battery to die and have an alarm go off twice daily. Wish it would just turn off instead of reboot with the power button.

LOTG said:
I just wanted to know if the display is an option, before I order one and take it apart to see if there is any more visible damage. It is not critical data, hence the cheapest option to retrieve it is the last resort at the moment. It should have been back upped but for some reason it turned out some stuff was not the last month or so.
It does still work, as I'm waiting for the battery to die and have an alarm go off twice daily. Wish it would just turn off instead of reboot with the power button.
Click to expand...
Click to collapse
Is there any knock-off screen that is advertised for redmi k20 but is definitely an LCD judging from price? If there isn't, then other screens for another phones probably aren't compatible (different connectors, different drivers, etc)
Also you need heat and prying tools, and screwdrivers to remove the mobo so connect the new screen.

Yes, it is listed as LCD on aliexpress for the MI 9t, pro and K20. They also sell the oled display but as the phone is going to be sold for parts I'm going for the cheapest option and just hook it up and not glue it in.
Disassembly is not an issue, it's not my first (and probably not my last). I just don't normally use different parts than what was in there.

LOTG said:
Yes, it is listed as LCD on aliexpress for the MI 9t, pro and K20. They also sell the oled display but as the phone is going to be sold for parts I'm going for the cheapest option and just hook it up and not glue it in.
Disassembly is not an issue, it's not my first (and probably not my last). I just don't normally use different parts than what was in there.
Click to expand...
Click to collapse
If it was cheap enough you may try it, if the data is important. But note that the screen is quite fragile, and you probably want to disconnect the battery from the phone when trying out the screen after it has powered off.

LR7875 said:
If it was cheap enough you may try it, if the data is important. But note that the screen is quite fragile, and you probably want to disconnect the battery from the phone when trying out the screen after it has powered off.
Click to expand...
Click to collapse
Disconnecting the battery is something you should always try to do as soon as possible when working with electronics.. The good old day when you just popped it out...
My plan was to put it back together with the new screen but not bother with gluing everything in, try to pull the data off and then wipe it.

If you are from EU countries you can buy, plug it, get data or set it to work remotely with PC and send it back to get refund

yaro666 said:
If you are from EU countries you can buy, plug it, get data or set it to work remotely with PC and send it back to get refund
Click to expand...
Click to collapse
LOTG said:
every option to remotely retrieve data is turned off
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Click to collapse
It is turned off. And in what universe could we turn it on without a new screen?lol

Related

Lets say I want to stop my phone from turning off..

Lets say I am sick and tired of my 8525 turning off on it's on randomly during the day and I have loaded 10 different roms all the way back to the stock one, I have ran it with NO aftermarket programs, I have replaced the battery, and I have added support to the sim card to make sure it isn't losing contact and still the phone turns off randomly on it's on.
Sometimes I have noticed that it will turn itself off if I slide the keyboard out (maybe 3 times out of 100 turn offs), but 97% of the time it will do it on it's on sitting on the desk untouched.
If I was going to take my phone apart, is there any ideas or general consensus to what parts might be causing the phone to turn itself off? Should I get a new sim card maybe?
Really sick and tired of my buddy with an Iphone throwing this bug in my face telling me what crap HTC is as well as missing calls.
If the phone is turning all the way off, over and over, then send it in for a replacement. If you mean the screen is just turing off after a certain amount of time, you can adjust that under: "Settings->System (tab)->Power->Advanced->then uncheck Turn off device if not used for x minutes. See if that helps, or maybe its just ur phone and you need a replacement. I sent mine in to ATT and got one back after my screen stopped turning on"white screen of death", heh. So it could just be a hardware issue that you cannot really solve urself...
The phone is turning all the way off on it's on. I have to boot it back up like I had just installed a battery or something.
I am out of warranty and do not want to pay for a refurbished phone since this is my third phone from them during the warranty already (and this ones been the best till now). I would rather someone tell me the board/part and I take it apart and fix it myself. I have the tools, the instruction manual in PDF someone posted a while back, a website with almost every internal part for sale, and experience taking small devices apart (ipods and such) and replacing items, I just want to know if anyone knew of which part could most likely be the part causing something like this before I start replacing things blindly. I plan to go ahead and take it apart and check ribbon cables since I want to replace the whole housing anyway.
Unfortunately, my D900 has the same problem with yours, it turned off when i just sending messages or just touching the screen, and my replacement battery is already on the flight, when i get it, i will test it again. Hopeful, i can get a sweat result~~
Mine doesn't seem to do it when it is in use. I have had to get in the habbit of looking at the LED on the phone to make sure it is still turned on. Gets real annoying trying to say the Iphone isn't all that people think, but then have this little problem and the fact I am on my third HTC product in the year time frame. But the others died within 30 days, this one has lasted 10 months thats why I want to keep it.
Well I think I figured it out. I took it apart and it looks like the black box that has the battery connectors to it and is soldered to the main board has broken loose. I am trying to fix it, but does anyone know how much the main board is if I need to replace it?

Can this G2 be saved?

My phone seems to be working fine, but it is hard to tell since the screen usually won't turn on. I say usually because once or twice a day I can wake the phone up and the screen will work, but as soon as the screen turns off again it usually won't come back on.
I am wondering if I wipe the phone back to stock if that might make it work like normal again, but my question to you is, Can I restore the phone to its original state without using the screen? Every time I try to boot to recovery or bootloader the screen stops working and I am stuck. Can I use ADB to do everything? If so, I need to know the commands to type in.
Is your ribbon cable loose?
Sent from my SGH-T989 using xda premium
It doesn't appear to be. Is there a good way to check?
Same problem I had. Sent it back to HTC and they fixed it free
Sent from my HTC Vision using XDA
Will they fix a phone that is rooted with CM7 on it?
loomism2 said:
Will they fix a phone that is rooted with CM7 on it?
Click to expand...
Click to collapse
I followed a PDF a member called strawmetal made, didn't need the screen, returned it to stock and sent it in
Sent from my HTC Vision using XDA
My phone also has a problem that sometimes appears.
Sometimes, the screen won't turn on at all. I would use the phone normally and lock the screen. Then, all of the sudden, when I pick it up again it wouldn't turn on at all, it's like it shut down.. After pressing the POWER button, it reboots and then works.
I am still thinking this is a software glitch rather than a hardware problem. The screen came on the first try this morning and I went into Our Groceries to add something. When I backed out of it the screen turned off, and hasn't come on since. Also, last night it was also working and I went into settings to lower the screen brightness. No matter what I set it to it stayed the same, and the Auto setting was unchecked. I think I need to just reflash the rom but I don't know how to do that without the screen being on.
Some phones have problems handling low voltages in sleep mode if you have underclocked it. On one of my g2's i had to 384mhz or something like that for the screen to turn on.
I think it was the underclocking, not shure. But something with the screen voltage
sent from phone
If all else fails, flash it to a stock rom. Try to make sure all the overclocking features are turned off. Try finding a rom that's just a clean and rooted stock rom. Do that first, then if that doesn't work then flash to stock.
Remember overclocking isn't for every chip on every phone. Not all chips are made equal, and some can be amazing at overclocking or under volting and some not at all.
That is what I am wanting to do, but how do I do that without being able to see the screen? Every time I boot into recovery, or even bootloader, I have no screen to see what I am doing.
loomism2 said:
That is what I am wanting to do, but how do I do that without being able to see the screen? Every time I boot into recovery, or even bootloader, I have no screen to see what I am doing.
Click to expand...
Click to collapse
If you can't see the screen even in recovery then it must be hardware. You might have damaged the flex cable to the LCD+digitizer. You can try to flash it to stock with HTC's tools. I remember doing it to my phone without needing to touch it at all. So long as the phone is on and charged, you should be able to do it. Just do a quick search on the forums, but make sure not to flash a rom that you can't root.
You can get it on Ebay for $26. They sell them with tools for a bit more if you don't have the tools.
http://www.ebay.com/itm/HTC-Desire-...019?pt=LH_DefaultDomain_0&hash=item1e67ead4c3
Here's the flex cable with tools.
http://www.ebay.com/itm/USA-Main-Fl...758?pt=LH_DefaultDomain_0&hash=item2c65ba56ce
Wow. So the cable is actually user replaceable? I guess I need a YouTube video or something to show how it's done. Of course, my screen works SOME of the time, so I don't know if I have the guts to perform this type of surgery without a viable backup plan if something goes wrong. This looks like something I would try after I have a suitable replacement phone already. Still, I find it impressive that this part is so easy to find! Thanks for the links!
If you decide to replace the ribbon, go ahead and replace the hinge spring as well, worked wonders for my G2.
i replaced the screen ribbon and the spring at the same time.
it wasn't too hard. takes about 15 - 20 minutes to do it the first time.
you can buy the entire ribbon assembly for pretty cheap. just be VERY careful with the USB/SD card ribbons on the side of the main board. one is a clip, the other is a pull tab. if u dont know which one is which- the phone will not have SD card capability when you break them :-(
loomism2 said:
Wow. So the cable is actually user replaceable? I guess I need a YouTube video or something to show how it's done. Of course, my screen works SOME of the time, so I don't know if I have the guts to perform this type of surgery without a viable backup plan if something goes wrong. This looks like something I would try after I have a suitable replacement phone already. Still, I find it impressive that this part is so easy to find! Thanks for the links!
Click to expand...
Click to collapse
This is the dirty secret of smart phones, in that nearly everything is replaceable, and usually for cheap.
Damaged the phone physically = housing = $60
damaged screen = lcd + digitizer = $50
Even the speakers are like $3, and I know cause I had to replace mine. The only thing that'll make you want to throw the phone away is if the main board or logic board is damaged. Even then you could probably find a broken phone that at least has a working board for cheap. I actually bought a $15 broken G2 that I plan to repair and give it to my sister as a gift. I have enough spare parts to make it work.
As for changing it, there's plenty of guides on how to replace the digitizer on YouTube. You have to replace the cable to get to the lcd+digitizer, so just follow the video up to that point.
http://www.youtube.com/watch?v=u-dR8CHEGjY
I have an issue with my screen. It is blank or grey or white lines. The phone works, just cant see the screen.
Anyone know why? Does anyone have a link to disasemble the G2?
Sent from my Transformer TF101 using xda app-developers app
hipertec said:
I have an issue with my screen. It is blank or grey or white lines. The phone works, just cant see the screen.
Anyone know why? Does anyone have a link to disasemble the G2?
Sent from my Transformer TF101 using xda app-developers app
Click to expand...
Click to collapse
here is the like to disasemble the G2
http://www.youtube.com/watch?v=u-dR8CHEGjY {thanks to @Dukenukemx }
I just wanted to say Thank You to everyone who helped me on this. I bought the ribbon, watched the YouTube video, and now I have a working phone again! $25 sure beats $350 for a new phone, and it was more fun , too.
Now my screen has trouble displaying colors with gradients. It looks like it isn't showing all the colors, so there is a weird muddy area between the dark and lighter portions, sort of like playing an old Sierra computer game from the 80's. Did it revert to only showing 65k colors instead of millions? Still, not a deal breaker in any way. The phone works and i couldn't be happier!

main screen doesn't turn on

Hello,
My wife dropped on floor her yotaphone 2 and now main screen remains always off and only back screen works.
In mirror mode I don't find a way to check if screen definitely broken. Can you suggest me a way to check if screen is gone?
Is there a way to try to reset everything from the back screen just to check if phone can be saved?
FandangoL said:
Hello,
My wife dropped on floor her yotaphone 2 and now main screen remains always off and only back screen works.
In mirror mode I don't find a way to check if screen definitely broken. Can you suggest me a way to check if screen is gone?
Is there a way to try to reset everything from the back screen just to check if phone can be saved?
Click to expand...
Click to collapse
I have exactly the same problem, have you found a solution yet?
mahfysh said:
I have exactly the same problem, have you found a solution yet?
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Click to collapse
Unfortunately not.
I checked with a local yotaphone service and the cost would be higher than actually the cost of a new yotephone.
I checked Yotaphone site and there the cost would be higher considering the cost of sending the phone there.
Actually my wife is using the EFD screen thanks to mirroring but I'm thinking to buy a new phone.
FandangoL said:
Unfortunately not.
I checked with a local yotaphone service and the cost would be higher than actually the cost of a new yotephone.
I checked Yotaphone site and there the cost would be higher considering the cost of sending the phone there.
Actually my wife is using the EFD screen thanks to mirroring but I'm thinking to buy a new phone.
Click to expand...
Click to collapse
right, the cost from their website is astronomical, I thought maybe there could be some light in the dark but I think I'll just sell the phone
Similar case here, but mine didn't fall: its front display was on for more than 2 hours, when upper side got very hot and switched off. Now, when I touch the on/off button, the display only briefly flashes in green. E-ink panel and phone both work correctly. I've tried to default reset and reflash firm without results.
Mine is a YD201 bought last october. Have you heard of other cases of front display low realibility?
Same
I do hear rattling inside so I’m gonna open up. I highly suspect something has disconnected in the phone itself. Though poor quality for breaking at one drop without any damage. (Other than the front panel won’t turn on)
Rattling could be due to the side buttons...
BTW I sent mine to repair to the seller -under warranty- and received a new one after 6 long months...

Seeking help extracting phone contacts from a broken phone.

Alright, long story short... I've been a user of a D-802 for the last 4 years. I was unlucky enough for the phone to be dropped from 2nd floor at work (don't ask how), the panel housing the screen is bent in right upper corner, which ultimately means this; I've fixed the screen two times, for it to be broken in less than half a month. Even more so, I ordered a new screen a week ago and it broke because of the bent frame 10 minutes after fitting the screen, as in, simply putting on the rear plastic cover, which broke the screen and the flex cable. Took it over to a repair store, they told me the phone has a broken cable on the screen and a new screen costs 90 EUR (not really worth considering how old the phone is.) and the motherboard was damp, too.
Now what I've got is a glorified brick. It turns on, the screen is black/non responsive to touch and it's stuck in file transfer or charging mode. Not really a problem, as I was able to retrieve all the photos from the phone through USB connection, however, what I'm really after are the phone contacts in there. We're talking about 3+ year old contacts that have a monumental value to me and I'd see gladly see them backed up.
Now, the reason I hadn't backed the phone is because it's rooted, obviously.
Out of ideas so far, will be eternally grateful to anyone with suggestions.
Lyricistlv said:
Out of ideas so far, will be eternally grateful to anyone with suggestions.
Click to expand...
Click to collapse
I think the easiest way is the same way you rescued your photos from internal storage. Search the system partition for database files like contacts.db or other *.db-files. One should contain your contacts.
Good luck! :good:
Thanks, but no luck on that behalf. Already tried that, also didn't find much luck with adb or other software, as it all requests USB debugging to be turned on.

Replaced my Moto G4 Plus battery but now the screen just flashes

Hi everyone,
I hope you can help with this problem.
I replaced my Moto G4 Plus battery last night and plugged it into the original Motorola charger (different USB cable). The white LED at the bottom of the phone blinks but the screen just flashes between a white lightening bolt icon, a black screen and the blue screen with the red Moto logo (the screen you get as if it is going to boot).
If I hold the power and volume down buttons together, I can get to the fastboot menu, which says "battery OK (charging)" in green letters, but choosing power down doesn't seem to work, and choosing recovery menu doesn't do anything either. At the bottom of the screen, it says "connect usb data cable" but I don't know what that means.
I've tried leaving it on the fastboot menu but eventually, after a few minutes, the phone screen just starts flashing as before.
I've tried plugging the phone into my laptop to charge instead and it just has the blinking white light without anything on the screen (screen is just black) but I can't get to the fastboot menu or anything. I left it plugged into my laptop overnight and this morning, it seemed to be on the cycle of flashing screens but went back to just a black screen with white blinking LED.
I've been googling for hours to try to find a solution but so far, haven't had any luck. I've tried using different chargers, different USB cables but still nothing.
I can't get the screen showing the battery percentage whatever I do.
So is the battery just dead - might the new battery be faulty?
As a potentially related issue - a few days ago, I took my phone to a local repair shop for the USB port to be replaced as I couldn't get the phone to charge at all. I collected the phone (which was now the dirtiest it had even been in it's life and had a small crack in the screen protector that had not been there previously) and it had been charged. When I dropped the phone off, I had mentioned I was concerned that the battery might be bulging but was told it was OK. After taking the phone home, the battery life remained poor so I googled whether it was possible to change the battery. After ordering a replacement battery and trying to fit it last night, I discovered that more than half of the screws holding the cover plate to the phone were missing, 2 of the remaining screws were the wrong type (philips instead of T3), the black cover was missing from the charging port/vibration motor, the copper tape was missing from the display connector and there was no longer any tape over the battery/battery connector wires.
Needless to say, I am not happy with the repair shop and at this point, I wish I had not bothered trying to fix my phone. All I wanted was to get it working again so I can use it to store my mp3s on and use it as a music player/emergency phone.
If anyone can offer some help, I'd be very grateful as I just don't know what to do now.
Go to the repair shop and get them to fix what they screwed up ie missing parts if you know they are responsible. Lean on them, at least get a refund.
Any battery swelling is a failure.
Stop beating a dead horse... at some point it's not worth throwing good money at it. Limited internal/expandable memory, ram and an LCD display all scream that it's upgrade time. Of course you could get the same model again as they are still available.
Just back from spending over 2 hours at the repair shop. They don't know where the missing parts are and will "ring round" to try to find them. If they can't find them, they'll try to order replacements but I'm not holding my breath.
I have upgraded my phone but since my Moto G4 Plus phone was previously working well, I wanted to change its use from my primary phone to be a music player and emergency phone. So getting it fixed was much cheaper than buying a large capacity mp3 player.
doodles77 said:
Just back from spending over 2 hours at the repair shop. They don't know where the missing parts are and will "ring round" to try to find them. If they can't find them, they'll try to order replacements but I'm not holding my breath.
I have upgraded my phone but since my Moto G4 Plus phone was previously working well, I wanted to change its use from my primary phone to be a music player and emergency phone. So getting it fixed was much cheaper than buying a large capacity mp3 player.
Click to expand...
Click to collapse
Can't find the DAC that the 3.5mm jack uses, is a high resolution 24 bit output?
The bluetooth on it lacks high resolution codecs support.
256gb max SD card support which is enough space for mp3's but .wav or higher resolution is better. It's a shame you were forced into this position but $hit happens. Been there, done that and it does suck. Very time consuming even if you throw money at it.
Weight your options for a best outcome. Stand alone Mp3 player? Forget that as there are many capable Androids that can fill the roll in the $100-200 price range even less with 24 bit DACs and bt LDAC, Apt X, Apt X HD and SSC codec support.
You got a lot of research to do... as you have a lot of options. Then you need to decide what's best from you and gives the best bang for the buck.
My solution which is near perfect for me and serves as a media server was the Note 10+, a 1tb of V30 rated SD card, Buds+ and Poweramp as the player. I had other considerations as it serves as my primary phone and is used for all my internet activities. It supersedes my laptop now.
Currently, I have a couple of old ipods but the memory on them is very small and I can't fit all my mp3s on them. I appreciate .wav files are better quality but I'm happy with my mp3s as they take up much less space!
Thanks for your suggestions on what to think about and for letting me know your setup.
I see what you're saying about my Moto G4 Plus and I don't doubt that most other people would be of the same opinion.
All I was trying to do was to give my beloved and well looked-after Moto a new life as a music player (which I need) and save some money into the bargain by investing a little in the project.
I'm really sad that it's now in the state it's in and am totally infuriated with the cowboys masquerading as a repair shop in my town. They failed to see that even if they give me a full refund, my phone is now missing parts that were all present and correct when I gave it to them in good faith to fix. Of course hindsight is a wonderful thing but I wish wish wish I hadn't crossed that threshold and trusted them.
Back to the problem at hand though - I've found other people's posts who seemed to have the same problem and I just think there surely must be a clever person out there who's fixed this or can explain what's going on.
Incidentally, I took the opportunity to ask the assistant in the repair shop about the battery - he took the phone to the corner of the room and plugged it into something that I couldn't see, then saidd the battery was ok. But after explaining what I ought to check (the battery connector) and then me opening the phone up myself to show him the connection (and point out the missing parts), he then said it could be a problem with the battery. So I took that to mean he hadn't a clue after all and given the poor service I had already had from them, it was as much as I expected.

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