My screen has been broken, after changing it, my fingerprint is no longer working, it scans successfully my fingerprint, but can't unlock my device by fingerprint.
In many under-display devices, if you get the original screen swapped out with a cheap one, the repairman will usually put an lcd (as an lcd usually costs half the price of an oled). The problem with lcds in these cases is that the fingerprint scanner cannot be used with them due to their construction (the metal frame behind the lcd), although they will work with oleds. He should have told you about this before you got the screen replaced..
It is a bit strange, however, that your finger print scanner is still scanning your fingerprint, but I still think its due to the replacement screen.
E.g.
PhotonIce said:
In many under-display devices, if you get the original screen swapped out with a cheap one, the repairman will usually put an lcd (as an lcd usually costs half the price of an oled). The problem with lcds in these cases is that the fingerprint scanner cannot be used with them due to their construction (the metal frame behind the lcd), although they will work with oleds. He should have told you about this before you got the screen replaced..
It is a bit strange, however, that your finger print scanner is still scanning your fingerprint, but I still think its due to the replacement screen.
E.g.
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Thanks for replying, but this isn't my case, I've used a new expensive original OLED screen, the finger print is working and scans my fingerprint normally, but when locking my phone and trying to unlock my phone, it doesn't work, i think it's something related to the software, as my phone is China version (very bad version) I hated it so much, I'll never by such a version
Well, installing a custom rom would solve both of your problems. You'd get better software, and there is a chance that the reader works on the custom ROM. Its a win-win, but proceed at your own risk.
My other suggestion would be to just take the device back to the repair shop where you got it repaired and ask them about the issue.
Related
I've searched and I can't find anyone else that has the same screen issue as me (they may have but without a picture I can't be certain).
Anyway, I was pulling stuff out of my gym locker yesterday and something knocked my Evo out. Of course it fell flat on the bench, thus causing the screen to become damaged. However, my "cracked" screen doesn't look like any of the other cracked screens I've seen online. My front piece of glass (the part your finger actually touches) remains intact and in great condition (I know I can still unlock the screen because I can feel the haptic feedback of the capacitive buttons), but it's like the screen behind it is what's actually damaged.
Is that correct? And what part would I need to order to replace it. Thanks
I believe that its the lcd
yep thats the lcd itself
Yep, sounds like your digitizer is ok, but your lcd is borked.
Thanks everyone. Will probably be picking up an EVO 3D, then selling my OG after I fix it.
Today I finally decided to replace the broken screen on my Nexus 7. Everything went well and according to plan, and when turning on the device I noticed it was working fine. However, upon closer inspection it turned out that one thin line on my screen isn't working. It's preventing me from doing SwiftKey flow, and when I tried drawing in Evernote I could see it was skipping over that part of the screen.
What could be the cause of this? I can't rule out that it's the screen part itself, but could it be more likely that I somehow damaged the LCD flex cable? I tried detaching and reattaching cables, so I have doublechecked that. I guess my question is mostly, how useful is it to try and replace the cable? Thanks in advance!
wi11ow said:
Today I finally decided to replace the broken screen on my Nexus 7. Everything went well and according to plan, and when turning on the device I noticed it was working fine. However, upon closer inspection it turned out that one thin line on my screen isn't working. It's preventing me from doing SwiftKey flow, and when I tried drawing in Evernote I could see it was skipping over that part of the screen.
What could be the cause of this? I can't rule out that it's the screen part itself, but could it be more likely that I somehow damaged the LCD flex cable? I tried detaching and reattaching cables, so I have doublechecked that. I guess my question is mostly, how useful is it to try and replace the cable? Thanks in advance!
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Did you replace the combo lcd/digitizer, or just the digitizer? In the latter case, you're lucky to have just a thin dead band; usually,1/3 of the screen would be unusable. In the former case, if the bezel is bent, however slightly, or there is some glue residue from the old screen on the bezel that causes the new screen to lie on an uneven surface, it would happen. I've experimented enough times to know the bezel has to be absolutely clean of everything and the surface must be 100% smooth and even. If you used strong tape on the new screen, your best bet is the multi-fix touch, as removing it would in most cases damage it.
graphdarnell said:
Did you replace the combo lcd/digitizer, or just the digitizer? In the latter case, you're lucky to have just a thin dead band; usually,1/3 of the screen would be unusable. In the former case, if the bezel is bent, however slightly, or there is some glue residue from the old screen on the bezel that causes the new screen to lie on an uneven surface, it would happen. I've experimented enough times to know the bezel has to be absolutely clean of everything and the surface must be 100% smooth and even. If you used strong tape on the new screen, your best bet is the multi-fix touch, as removing it would in most cases damage it.
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I replaced the screen + digitizer. I looked at the bezel (luckily the tape I used wasn't that strong so the screen was still detachable) and I cleaned it up thoroughly. There were indeed some glue residues left. However, it was no use, the screen still fails in the same locations. I had high hopes this might be the cause, but apparently not.
I highly doubt the bezel was bent, because I was very careful with it. I will try out the multi-fix touch option, but I'll do that tomorrow as I'm quite tired now. Thanks for all the suggestions!
wi11ow said:
I replaced the screen + digitizer. I looked at the bezel (luckily the tape I used wasn't that strong so the screen was still detachable) and I cleaned it up thoroughly. There were indeed some glue residues left. However, it was no use, the screen still fails in the same locations. I had high hopes this might be the cause, but apparently not.
I highly doubt the bezel was bent, because I was very careful with it. I will try out the multi-fix touch option, but I'll do that tomorrow as I'm quite tired now. Thanks for all the suggestions!
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Don't know if you're familiar with the mechanics of the touchscreen, so I'm adding this for the sake of completeness. Lots of people would post problems and when you try to help, would snap back: "I already tried this and that and other things..." So if you already know, forget the rest.
I've found Yet Another Multi-touch Test (YAMTT) of tremendous help in diagnosing. When you switch from one firmware to another, YAMTT allows you to pinpoint exactly where touches do not register. If the dead band remains consistent, it's probably the screen itself. However, touch detection sometimes varies with the speed at which you touch. I've seen touches missing in some areas, which would register on a second or third or fourth pass. So, go slow in those areas, and back and forth to make sure they're really dead. Tedious process indeed, since you have around 30 variants to play with.
graphdarnell said:
Don't know if you're familiar with the mechanics of the touchscreen, so I'm adding this for the sake of completeness. Lots of people would post problems and when you try to help, would snap back: "I already tried this and that and other things..." So if you already know, forget the rest.
I've found Yet Another Multi-touch Test (YAMTT) of tremendous help in diagnosing. When you switch from one firmware to another, YAMTT allows you to pinpoint exactly where touches do not register. If the dead band remains consistent, it's probably the screen itself. However, touch detection sometimes varies with the speed at which you touch. I've seen touches missing in some areas, which would register on a second or third or fourth pass. So, go slow in those areas, and back and forth to make sure they're really dead. Tedious process indeed, since you have around 30 variants to play with.
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I don't know about the mechanics of the touchscreen, so all of this is helping me
I took a look at that tool, and I posted the result of drawing on imgur: paste "oyIt3bg" after imgur.com (I'm apparently still too 'new' to post links, sorry about that). It is clearly one band, very consistent. I think I should probably talk to the shop I got it from and ask for a replacement. Which sucks, because this particular parts took 3 weeks to even get here. Anyhow, glad I know what the problem is now. Again, thanks for all your help, I appreciate it
Hello fellow dutchie,
I have experienced this problem on my Nexus 4, and after having replaced the LCD+digitizer I also had issues with touch responsiveness in exactly the same areas. As silly as it would sound beforehand, it doesn't seem to be the screen or digitizer. Best... to give up.
Hi everyone!
I bought a new display and a new fingerprint scanner. Now, on the old one the scanner was solidly glued to the screen. Does anyone have any ideas on how I should attach the new scanner to the new screen?
Like, is there thin double sides tape I could use? Just an example. On MIUI someone told me to use epoxy, would that block the ultrasonic fingerprint you think?
I attached some photo's, two are of the old scanner, still with some white display on it. it needs to be on the small glass windows in the other photo. The glass of the home-button on the old scanner is glues directly with some very thin-spread glue.
This is the new one I have:
https://www.aliexpress.com/item/New...-ID-Fingerprint-Sensor-Parts/32803906214.html
What would you think is the best way to attach a ultrasonic fingerprint scanner to a display?
Please think with me! Thank you so much
Just use some epoxy resin! You know, the one that comes in two parts, and you mix together.
Take one that hardens in 3-5 minutes, prepare only a little glue, you wont need more than an equivalent of a small coin.
Make a test first, take same quantity of each resin component and mix it gently for about 10 seconds,then apply it to something you don't care about (ex. the old broken screen, and glue the old sensor into it). Wait the required time and then check that it's nicely glued.
If you made the mix wrong it won't work well and may keep in liquid state.
Have some alcohol to clean (Alcohol for wounds works well), the epoxy cleans easily with it when it's liquid. But once it has hardened it will be a nightmare!
When you are about to glue the sensor on the new screen, apply some epoxy onto the sensor, making a uniform coating of about 0.3mm or so, no too much, but it must be a little in excess to fully fill the gap between the sensor and the screen.
I often use it to repair phones in special cases as this one, never had a problem!
I should go for UV glue, I think this is what they do on manufacturer.
Enviado de meu 2014819 usando Tapatalk
If you where buying on Aliexpress why didn't you just buy one that was already glued? It costs a couple of dollars more.
pr0x2 said:
If you where buying on Aliexpress why didn't you just buy one that was already glued? It costs a couple of dollars more.
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Could you please share a link? I didn't find a screen with working fingerprint sensor that cost only a couple of dollars more
Hey, did it work? I mean the epoxy surely does work, but does the sensor function properly? I would be willing to pay those 100$ for the original screen, but all of them are out of stock, and 150$ is a bit too much That means I have to go the oem screen assembly route :/
My screen died in milkwater btw.
did you solve the problem? i have to do same process but i dont know how
same here.
looking for soolution
Did you solve the problem? did you try to glue the fingerprint sensor to the new lcd? Could you please tell us about your experience, I am in the same situation
I'm gonna be trying this, but it will be a month or so till I get my new screen.
Piciu256 said:
Hey, did it work? I mean the epoxy surely does work, but does the sensor function properly? I would be willing to pay those 100$ for the original screen, but all of them are out of stock, and 150$ is a bit too much That means I have to go the oem screen assembly route :/
My screen died in milkwater btw.
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Where do all of you see screens for 100$??? Every OEM screen that I've seen on eBay runs from 50-70$ CAD so like 40-55$ USD
I looked in google and Aliexpress, I dont want an OEM screen- I want an original one, but noone sells it for a reasonable price. I found a original LCD with OEM digitizer though (40$), and thats what I went for. Just waiting for the package.
I bought the highest rated fingerprint sensor also, gonna report if it works.
@Piciu256 Tell us how is it going, how will you connect and if it works.
Could you please share the links and how long will it take for it to arrive to your house.
I can share some ideas with you.
I bought my screen assembly on Dragon Tt site, it's the "oem glass+original LCD" one, the fingerprint reader is this one: s. aliexpress. com/jemyIrQN
Should be 2 weeks tops till the LCD comes, then I'm going to use a standard 2 piece epoxy to assemble the thing, then the b7000 glue to attach the assembly to the frame.
Gonna report again after the fact if it went well.
Interested in this as well, following this topic . Just busted up my screen, the buttons and fingerprint scanner don't or barely work anymore.
Can someone recommend a good replacement screen, or is the dragon-tt the best option?
Thanks
I'm replace LCD and bought new fingerprint sensor. New sensor replce with b7000 blue, but fingerprint doesn't work.
Anybody know how to resolve this problem?
The sensor is bad or the b7000 glue is not appropriate for this operation (why you no use 2 part epoxy as sudgested?) either way you are fckd- you cannot remove the sensor without destroying it, and you probably cannot clean the surface well enough without damaging the screen to install a new sensor so no fingerprint for you.
My screen came in today, I'll report in 2 days if all works. @edit the epoxy is curing atm, its great because its so sticky- you just need to locate it in the beginning and not touch it for few hours, it makes its magic by itself- no need to anker anything down
The sensor didn't work for me either, tho that might be a case of my phone not working properly as the previous one wasn't working either.
The screen is great quality, the digitizer sticks up a little more than original though.
If you want to try yourself- use epoxy, it seems perfect for this use, the sensor is 5$ so it doesn't cost you anything
ps. Do any of you also experience this weird glitch in chrome that when I type something longish then the app takes up to 1,6GB (I believe the system doesn't grant more) RAM and freezes? (this post was enough to freeze twice and crash)
Hey guys, someone replace fingerprint and works fine? I'll paste mine What do you use for this? epoxy is safe?
thanks
Piciu256 said:
The sensor didn't work for me either, tho that might be a case of my phone not working properly as the previous one wasn't working either.
The screen is great quality, the digitizer sticks up a little more than original though.
If you want to try yourself- use epoxy, it seems perfect for this use, the sensor is 5$ so it doesn't cost you anything
ps. Do any of you also experience this weird glitch in chrome that when I type something longish then the app takes up to 1,6GB (I believe the system doesn't grant more) RAM and freezes? (this post was enough to freeze twice and crash)
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does the homebutton function work tho?
Hello!
I bought a lcd screen (mine is with broken glass but working) for about 120usd from aliexpress and tried to replace by myself. I followed a tutorial step by step, removed Sim slot, opened the back, remove the screen and plugged the new one. I turned my phone on, everything was working (touch, image, fingerprint), but when I put the Sim slot back again, the screen turned to this (see attachment), and even after removing the Sim slot, the screen stays the same way. The old one is still working OK.
I don't know nothing about Eletronics, maybe could be these missing contacts (sponge metal) on the lcd from aliexpress? (the right one). Does it have solution?
THANKS!
:/
our phone has a super amoled screen...that surely is a downgrade, in screen quality and battery life wise. ;S
Either you got scammed, or some contacts aren't connected right. Try again
Are you saying that this screen isnt amoled? It's lcd? Thanks!
The exact same thing happened to me, including the color noise. I bought the screen from AliExpress. After asking someone with a bit more expertise than me, a was told that the displays actually are AMOLED, but they are inherently flawed cheap knockoffs using refurbished components and terrible driver chips, which only support 2 brightness values. My screen stopped working completely shortly after installation and didn't fit properly in the phone. A opted for a return and refund, got the $120 refunded and the postage fees only cost me about $15. I suggest you do the same. I got another second-hand P2 for $150 dollars with a screen intact and switched the screen from it.
Phantoml337 Thank you for the answer! Do you know if there is anything i can do to repair this screen or it wont work anymore? Thanks!
pspbr94 said:
Phantoml337 Thank you for the answer! Do you know if there is anything i can do to repair this screen or it wont work anymore? Thanks!
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as long as you get an original display replacement or a good alternative, you can repair it as you normally would. Ask some experts, they know their stuff. Otherwise, buy a second hand p2, they often work just fine, flash some newer firmware on it, to make it clean and use it as normal, i guess.
But this fake screen, can I repair it?
My LG G7 fingerprint sensor broke due to a small hit, and replaced it with an article I bought off ebay.
It's called "Replacement OEM Replacement Fingerprint Scanner Button Grey For LG G7 ThingQ UK" and it's sold by replacebase.
The problem is that now it's not recognized by the phone. It says: "Unable to use fingerprint sensor. Please contact a customer center"
Did anybody have the same problem?
Tech service says they don't actually replace only the fingerprint scanner, but that it comes with the back cover in a single unit.
To have it replaced separately, it's required a double sided tape, like 3M 4905 or 3M 300LSE.
Websites selling it:
LG G7 ThinQ Fingerprint Scanner Replacement - Platinum Grey (Genuine). Recommends 2mm Premium Red Double Sided Adhesive Roll.
Another website:
Fingerprint Scanner for LG G7 ThinQ (Genuine OEM) - Black
Did you make sure the connector was sitting correctly and didnt move when you replaced the back case?
loonycgb2 said:
Did you make sure the connector was sitting correctly and didnt move when you replaced the back case?
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I think I put the fingerprint sensor connector in almost the same place, but will try again tomorrow. Hate doing it because the back cover is glued all around.
I think I know what the problem is: when the fingerprint sensor broke, it got really hot all the time and drained battey. Probably something got burnt in the motherboard, hence it doesn't recognize the newer fingerprint sensor.