LG G7 unable to use fingerprint sensor after replacing it - LG G7 ThinQ Questions & Answers

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.

Related

Very Cheap Atrix Replacement Parts

http://www.chinagadgetland.com/fing...e-for-motorola-atrix-4g-mb860-p-10007339.html
I just found this website and ordered a new fingerprint scanner. It is a lot cheaper than Cellular DR. I'll update the thread when I receive it on request. You can use paypal so you should be safe.
thank's for sharing! from where did you order?how much shipping?
Hi, do you know if this bezel:
http://www.chinagadgetland.com/front-bezel-cover-for-motorola-atrix-4g-mb860-p-10007155.html
will replace the casing around the hdmi and charging port as I have snapped mine and the phone is slightly lose in the dock.
Shipping was only $4.
Not sure if thats the side, but it does not look like it to me.
Though this seems like a good vendor, they're hardly cheap.
I've seen the Atrix's LCD for ~$60 and it was over $70 here.
are the replacement part available on ebay not good?
if i wish to replace parts because touch isn't working and no problems with glass then do i have to replace the whole screen+digitizer or just the digitizer?
heavyarms1912 said:
are the replacement part available on ebay not good?
if i wish to replace parts because touch isn't working and no problems with glass then do i have to replace the whole screen+digitizer or just the digitizer?
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Click to collapse
Your glass screen is your digitizer so, yes and no lol but you won't have to replace the LCD underneath the digitizer.
I bought a digitizer+frame off of ebay for about the same price as the digitizer this website. It was pretty easy to replace, as cell phone repairs go. It was a little scuffed up when I got it because it was used, but it fixed my issues!
Just received my fingerprint scanner today.
Worked perfectly by the way.
Two cautions:
1. Does not come with the bottom piece of the fingerprint scanner, only the scanner part. What I did was remove the old scanner via force and just super glued the new one on top of the bottom piece.
2. Came marked up by a permanent marker where the scanner is, but easily removed by alcohol.
LivingChampion said:
Just received my fingerprint scanner today.
Worked perfectly by the way.
Two cautions:
1. Does not come with the bottom piece of the fingerprint scanner, only the scanner part. What I did was remove the old scanner via force and just super glued the new one on top of the bottom piece.
2. Came marked up by a permanent marker where the scanner is, but easily removed by alcohol.
Click to expand...
Click to collapse
I'm going to order the earphone jack http://www.chinagadgetland.com/earphone-jack-connector-for-motorola-atrix-4g-mb860-p-10007335.html because my earbuds won't plug all the way in.
lol funny thing happened. i replaced my digitizer with an OEM refurbished one and gave it a wipedown somehow in the assembly my fingerprint scanner has started working for the first timeever.
i must say its awesome
Thanks for the link.
LivingChampion said:
I just found this website and ordered a new fingerprint scanner. It is a lot cheaper than Cellular DR. I'll update the thread when I receive it on request. You can use paypal so you should be safe.
Click to expand...
Click to collapse
Thanks for sharing this link.
so... this site is legit???
Yes, this site and I are legit.
Bump, maybe someone is looking for this.
Not parts availabe for motorola on the site. Any help??

Just swapped the proximity/light sensor board (maguro - toroplus)

This might be useful to others experiencing the same issue.
It began with the screen turning off whenever the dialer or skype has connected. A frustrating experience for the wife as she was traveling overseas. I thought it was a ROM install issue until it dawned on me it could be the proximity sensor. True enough, sensor apps reported nothing from neither the light sensor nor the proximity sensor, though front camera worked fine.
I swapped it with one from a spare toroplus, and it worked. On the toroplus, the bad one still didn't work confirming it's defective. It's interesting that the front camera on the same accessory board had no issue at all. Oh well, a replacement is a few bucks from ebay.
Regarding the assembly/disassembly: it's very simple. Remove all visible screws under the battery cover, then insert a plastic prying tool between the glass and the case, then work the case off. Once the back cover is off, the main board could come off after disconnecting the various micro connectors.
My impression was that the toroplus main board was much easier to remove because the connections to the power/volume switches are simple snap-on. On the maguro, the connector to the power switch is finicky. After accidentally detaching it and seeing it was quite brittle, I put it back on and left it attached as I was able to push up the lock of the front camera board connector with a small flat head screwdriver.
Very cool... but this thread is worthless without pics!
Pics, or it didn't happen.

How to attach fingerprint scanner replacement

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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Click to collapse
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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Click to collapse
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)
Click to expand...
Click to collapse
does the homebutton function work tho?

Proximity sensor issue - foam gasket

I know this is a long shot but here goes. I got a 2nd hand nexus 5x but the proximity sensor does not work. It shows 0 cm on the AIDA64 app. After researching online it seems there's a piece of foam/gasket that covers the hole on the display/lcd whatever its called. It is missing on mine. Most likely the screen was replaced at the time and the new screens don't have this apparently. I even bought a new screen/digitizer on ebay but no foam. Does anyone know of a workaround for this or how I can make/buy a piece of foam this tiny? I'm not even positive this is the problem. I'm also not sure how a piece of foam would prevent the sensor from working.

Fingerprint isn't working after replacing my screen.

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.
Click to expand...
Click to collapse
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.

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