yashsingh1/xdaforums huggingface dataset:
[POCO M3 Questions & Answers] sarabbafrani:
Dead poco m3 is in edl mode always

That you can check it with pcbut first you shuld install Qualcomm 9008 driver on windows from internet

You will find it in windows device manager (ports) when your phone plugged to pc with USB
[POCO M3 Questions & Answers] sarabbafrani:
You can also renew thermal paste on cpu emmc and (pmi632 charging ic) to get better speed

Choose no copper thermal paste (this kind will connect electric parts also with thermal sync)
[POCO M3 Questions & Answers] sarabbafrani:
Use ziped OTA rom to flash it from recovery with mi flash pro app
[POCO M3 Questions & Answers] sarabbafrani:
You said alot of people

I saw this issue even on oldest rom without any updates

But we can not talk certainly anything in world almost 100% working

I realized if it has response on temperature

According to my expertise in mechanical engineering then it will be gap Tolerance (when phone getting warm by itself, smaller parts may get temperature sooner than bigger metallic Shields, next according to size of this big capacitor and gap between them & shield assembling machine force) The solution was obtained

Every day in this 9 month i have 1-4 phones each day Without even one case coming back again.

I think it's related to physics and electronic knowledge and xiaomi design team

I told this problem and fix to xiaomi about 9 month ago even I don't received any feedback from them
[POCO M3 Questions & Answers] alecxs:
I don't think software update can fix that. EDL is booted straight from PBL it does not even pass SBL or XBL

so I let drain battery by holding vol down + power with hair tie for three days. it left EDL mode when battery died, and low battery icon is displayed.

From this state I somehow managed to enter fastboot mode by only holding vol down with hair tie + connecting usb to PC (low charging 500mA)

once in fastboot mode I installed android_winusb.inf and booted from fastboot.exe

fastboot continue

Now I won't update or reboot ever and keep battery charged between 20% - 80%
[POCO M3 Questions & Answers] Burn2Hell:
I've send my phone back for repair. Curious what they define for repair/fix. I think I'm better of with getting my money back and buy a Samsung budget phone.
[POCO M3 Questions & Answers] sarabbafrani:
They will change phone I think
[POCO M3 Questions & Answers] ANerdyNub:
so if I just hold the power button when phone is on to force poweroff, I can just turn it on normally after?

I was tinking of waiting for battery to go to 0 when the phone is on

Loop-x forgot to quote​
[POCO M3 Questions & Answers] ANerdyNub:
I also got the deadboot with this update, I am now trying to update to 12.5.7
[POCO M3 Questions & Answers] ANerdyNub:
what worked for me was just waiting for battery to drain and then put on charge and the battery icon appears, after 5 minutes poco logo appeared, after that it went back to battery icon, so I kept pressing volume down and up buttons so it doesn't go black and then when it shows one percent I just hold power button
[POCO M3 Questions & Answers] sarabbafrani:
All scenarios are available , depends on capacitor gap in your phone

Best way is fix that i told here

Ask someone mobile technician to remove that little shield for permanent fix to end this problem forever
[POCO M3 Questions & Answers] alecxs:
it's bad hardware design, all these software workarounds are just coincidence
[POCO M3 Questions & Answers] ANerdyNub:
So coincidence that it happened after update and never happened before?
[POCO M3 Questions & Answers] alecxs:
yes, exactly. software update itself does not harm anything. it's the reboot itself that made the correlation in time
[POCO M3 Questions & Answers] ANerdyNub:
Then why do people say it helps to update firmware?
[POCO M3 Questions & Answers] alecxs:
flashing from MiFlash in EDL mode forces reboot, so it may exit EDL mode (if you're lucky)

I am still on V12.0.9.0.QJFEUXM EEA btw and never did any update. one day in brigudav's TWRP I tapped reboot to system and it happened...
[POCO M3 Questions & Answers] mfoxbr:
I'd like to say thank you for @sarabbafrani for the method that worked great on my mom's Poco M3. I'm a complete newbie on soldering and all, and I adventured myself on doing the shield removing as I didn't quite have trustworthy technicians around my city. My mom's cellphone went from not responding at all on pressing the power button from working great, with (at least as I'm posting this) no sequels at all. I protected all the motherboard (except the shield) with aluminum foil, used the heat blower setted on slow flow (300ºC), one drop of RMA 223 flux on the shield and went very slowly, following the steps on the video posted by @rajlesta, for witch I'd like to say thank you also! You guys are great!
[POCO M3 Questions & Answers] sylvio2000:
Hi. I have not read all posts in this thread, but I have one question:

Is the removing of the shield the only possible fix to be able to restart or power on/off this device anymore?

Or is it possible, after draining the battery, to install a custom rom and everything is fine?
[POCO M3 Questions & Answers] sarabbafrani:
If you want my opinion

Removing is better

Because I've seen some cases with draining battery , call instability and...

Its not dead problem only

Can affect on other parts.
[POCO M3 Questions & Answers] alecxs:
I can report after draining battery for three days and good portion of luck phone finally booted again. But next day my phone switched in Safe mode without reason. So something is wrong for sure. Now I am stuck in Safe mode and can't use most of my apps
[POCO M3 Questions & Answers] sylvio2000:
OK. I already wrote to Xiaomi support. They said if it is not a mechanical error they repair it for free. The phone is 1 year and 3 month old.

The question is: How does Xiaomi repairs the phone? I installed the xiaomi.eu rom. I think they will only set the device to stock rom. I will link xiaomi to this thread. Maybe it helps to understand the problem.
[POCO M3 Questions & Answers] alecxs:
they won't repair it. they don't know how.
[POCO M3 Questions & Answers] sylvio2000:
What do you mean? That Xiaomi installs the stock rom?
[POCO M3 Questions & Answers] Pablo Sub-Zero:
Hi guys, i own an M3, i got deadboot the first time and i had the shield removed by a good technician, after some weeks i got deadboot again when trying to reboot from fastboot mode, when i plug my phone to the computer makes the windows sound that the phone is connected to the computer but the screen is still black, what should i do guys???
[POCO M3 Questions & Answers] alecxs:
Bad. so the "fix" isn't as permanent as it seems...

you could try this
[POCO M3 Questions & Answers] sarabbafrani:
Disassemble it take photo from motherboard and send me

To check you technician work

Measure charging amp

Connect to pc if Qualcomm 9008 detected feedback me
[POCO M3 Questions & Answers] wasThere:
I think they put a new motherboard in it. People having the repair done say the IMEI has changed.
[POCO M3 Questions & Answers] Burn2Hell:
The phone is back, they have swapped/replaced the motherboard (new IMEI number). It came with 12.0.9.0 I've updated it straight away to 12.5.7.0 and now I hope for the best that it keeps working.
[POCO M3 Questions & Answers] ogy_j:
Hi !

I've remove the shield protector but the phone react the same as before

Phone is discharge, when i plug the charger the screen show battery

Then i've got Poco animation for 3 seconds then i've got charging amination

When i'm trying to power on the phone, the screen goes black

Then i have to wait the battery to discharge again

I also tried to charge until 20% then try to power on :(

Before and after removal the shield the phone react the same way

I've sucessfully start the phone one time but i don't remember what exactly i did....
[POCO M3 Questions & Answers] Pablo Sub-Zero:
How did you discharge the battery?
[POCO M3 Questions & Answers] ogy_j:
Let the phone discharge itself.. about 2% per hour

So if you charge 20% you have to wait about 10-12 hour
[POCO M3 Questions & Answers] leofa:
I was having the exact same problem. But prior to shield removal, it wasn't even charging (showing charge animation or anything like that).

After removing, it was behaving like yours but after one our checking, I realized that I wasn't assembling the board correctly and the board wasn't touching the buttons conectors on the botton left side of the board, near where the buttons are located on the phone. after checking that, phone worked like a charm. Rebooted multiple times, turned off and on and no problems at all so far.

Thanks @sarabbafrani !
[POCO M3 Questions & Answers] ogy_j:
For the first charge, how many % of battery did you turn on the phone ?

When i'm pressing power button for 4 secondes, the phone turn black screen

I tried 2% 5% 10% 15% 20% 30%

for the moment nothing is working :(

edit : damnnn i've just broke the power button..
[POCO M3 Questions & Answers] sarabbafrani:
1%
[POCO M3 Questions & Answers] sarabbafrani:
Do like me

Your phone will power up
[POCO M3 Questions & Answers] ogy_j:
I've tried this, but nothing is going on.

I've order a new button in aliexpress to see (2 months)

If nothing is still happening I can say the motherboard is dead
[POCO M3 Questions & Answers] sarabbafrani:
Do you plug battery and lcd correctly?

Hold it more

Do you have battery charging sign?

And make me picture from broken power key
[POCO M3 Questions & Answers] ogy_j:
No more battery sign, since the power buton is broken. Everything seems well plugged

Before, when battery is not plug in the motherboard, and i plug the charger, i have battery sign on the screen but no more now... :(

I can't press it anymore it
[POCO M3 Questions & Answers] sarabbafrani:
You can change this little key with soldering iron from another phone or buy new one its shorted now
[POCO M3 Questions & Answers] ogy_j:
Yes i've order a new one, but without this, the phone won't show battery sign on the LCD..

I hope this is it otherwise there is something wrong on the motherboard
[POCO M3 Questions & Answers] sylvio2000:
Hi.

Just a quick info for you (hope I can translate it correctly to english):

On monday I have sent my poco m3 to xiaomi. They said, if it is a hardware error they repair it for free. If not, they tell what the repair will cost.

Today (thursday) they wrote that they have to order a spare part to repair it.

Somebody here wrote xiaomi changed the mainboard of his phone. Maybe they do the same with mine. I never would have thought that they really repair such a cheap smartphone. I thought they just give me a new one 😁
[POCO M3 Questions & Answers] Pablo Sub-Zero:
Guys, how long do i have to wait for battery to fully discharge?.

It's a week and some days now, when i connect my phone to PC it still indicate by making the windows sound.

Before it was making double sound but now it only makes a single sound, the method I'm using to discharge is tying rubber bound with a piece of paper to the power button.
[POCO M3 Questions & Answers] ANerdyNub:
depends on how much the battery was when you turned it off but for me it still took 3 days when I had 2% so I'm not sure
[POCO M3 Questions & Answers] Pablo Sub-Zero:
Okay, I'll give it more days then
[POCO M3 Questions & Answers] ANerdyNub:
You can also try leaving it plugged in to a computer that's turned off, since that drains the battery because it's holding a connection or something not sure but it worked for me
[POCO M3 Questions & Answers] dhygo:
I registered just to say thanks for @sarabbafrani , thank you it worked, thank you.
[POCO M3 Questions & Answers] dhygo:
Me cadastrei só para agradecer pelo , obrigado funcionou, obrigado.
[POCO M3 Questions & Answers] Linuxkek:
So it can be the antenne if Wifi and 2G works but no 4G? But how it can find 4G network (see screenshot)?

I get my M3 back (warranty case) and anything works but no 4G. I also try to set it LTE only with *#*#4636#*#* but than no signal at all.
[POCO M3 Questions & Answers] Sus_i:
If the small antenna cable is plugged in at the board, 4G should work too.

Since the phone shows on your Picture Tcom, O2 and vodafone 4G network, it's most likely an issue with your provider and/or the mobile settings...
[POCO M3 Questions & Answers] Linuxkek:
That is my question. Without 3G/4G antenne I should not be able to find 4G network?

I put the sim card in a other phone and get 4G. Also switch sim slot 1 and 2.
[POCO M3 Questions & Answers] Sus_i:
Idk. Maybe @sarabbafrani can tell us the answer.

If you want to try it, the backcover and the antenna plug is easy to remove.
[POCO M3 Questions & Answers] b1.b0r4:
I encountered this same problem, what I did was unplug the battery but still the phone won't turn on, so I drained the motherboard by placing the multi tester point on those 2 contact point just above the battery connector on the mainboard, wait till it is fully drained, 0.001v

this made it turn on after placing back the battery.

seems like a caps or power IC issue

another issue was earphone sensor
[POCO M3 Questions & Answers] n53r10us:
i dont have a heat gun.

can i remove the shield with a soldering station?
[POCO M3 Questions & Answers] Sus_i:
Why not? Isn't a soldering station even better than a crappy heat-gun?
[POCO M3 Questions & Answers] n53r10us:
How long do i need to heat up the shield?

I stay Like the Pictures for over 10 minutes and the shield doesnt even moved a bit.

I slide the soldering slowly up and down.

So i need the bottom boarders to heat up or would it be enough to do the picture way just longer?

In the videos it looks like u doesnt even need to pressure the shield to remove.

Edit: would it be better to cover the other parts and use a hairdryer? Would this work? Or is a hairdryer not hot enough?

What do i even melting? Some kind of glue or the shield itself?

Do i need the paste they all use?could i use some pc cpu heat flow paste?
[POCO M3 Questions & Answers] Sus_i:
The shield is soldered to the board using lead-free solder, which starts melting at about 220°C.

Add some solder to the tip and use some flux too, better for heat transfer.

It may be that your soldering iron is to weak, you can try the hairdryer together with the soldering iron. Make sure to cover all parts around from airflow...
[POCO M3 Questions & Answers] sarabbafrani:
I use 400°C with 120 air flow quickly

Because with low temperature

Pcb transfer heat to other components on motherboard and whole of pcb gets hot. Anyway this process depends on tools and experience
[POCO M3 Questions & Answers] Aicene:
Hello sarabbafrani ;-) Your method to wake up M3 are just excellent, but it didn't work in my case :-/ Everything starts when I want to switch from WiFi to 4G. I realize that flashlight are greyed out. Hmzz, may be problem with camera. I run it, at first sight it works, but show some error message. OK, **** happens :) Because I must to drive to work, I run Waze. Same situation, error message. OK, I restart it, it help me a lot of times, but not this time :-/ Just later I realize, phone are dead and found that is very common problem with M3. At that moment it at least appears on PC as Qualcomm. OK, I removed that cover(I used hot air gun), but it didn't help. What was strange, there appears like burned hole on that big grey part under that cover. After that it stops appear on system :-( Next move, I disconnect battery, plug in USB-C, then appears empty battery sign. When I push power button, connect battery, disconnect charger, it starts dead boot loop, just screen flashes without any image. I tried to find solution, but wasn't lucky still :-/

P.S. Start to think, may be I should drain the battery???
[POCO M3 Questions & Answers] Warbaby77:
Hello guys, my poco m3 died at 100% battery charged. How can I drain my battery faster, anyone? Thanks.

Note: I've tried holding the power button, nothing yet.
[POCO M3 Questions & Answers] Pablo Sub-Zero:
Guys my battery is still not drained, its 3 weeks now
[POCO M3 Questions & Answers] Sleltry:
I found this post about 2 months ago and try to disconnect the battery to try turn on like was mentioned, so I bought some precision tools and open the phone, finally I could turn on. But after 1 month it was slow and I needed to restart, and this time I couldn't turn on again. So I went to a repair shop and ask the guy to only remove the shield. After the board cool down, I placed all back and the phone turn on normally. Don't have any problem with 4g yet.

Thanks to @sarabbafrani and everyone who tested and posted
[POCO M3 Questions & Answers] Elijahfrodo:
Good morning from Nigeria. My Poco M3 came back to life after removing that cap you said we should remove. Theses no issue with it and I've been using it for the rest four days now. Thank you sir
[POCO M3 Questions & Answers] ogy_j:
I've install the new button but the phone still don't want to start :(

The shield has already been remove

The screen show no battery, i'm charging like 25% then try to power on but i've got a black screen then i've to wait the phone discharge

I've also reassemble back the phone but still doing the same
[POCO M3 Questions & Answers] zaki789:
It did work by removing the shield but now i have a new problem network on both sim card is not working it only works when switch to 2g only i need some help please
[POCO M3 Questions & Answers] sukinsyn:
Thank you for your advise with using multi-meter to dr! It worked for me. You are my saver!

Also I'm curious if you just short those 2 contacts for power drain(if people don't have multi-meter), would it be fine, would it provide the same effect?
[POCO M3 Questions & Answers] ogy_j:
Can you do a picture of that plz ?
[POCO M3 Questions & Answers] Sus_i:
Make sure that the small antenna cable is plugged in at the board...
[POCO M3 Questions & Answers] zaki789:
Well I broke the original cable now i replace it from a repair shop they told me it's from a poco m3 but still the same problem only gsm and 2g works no 3g/4g
[POCO M3 Questions & Answers] Thankyou4allthework:
Hello everyone! Thanks a bunch! This is the only method that worked. However, I did it slightly differently. Since it wouldn't boot in fastboot mode while was connected to my laptop, when it started charging I connected it to the charger and let it charge 2%. After I pushed down power and volume down and it triggered fast boot mode. Then I connected it to the laptop and used "fastboot continue command". Ther is also a small software tool that's called XiaomiADBFastbootTools, it's more user-friendly than cmd from platform-tools..

You saved me! Now I can retrieve all my personal files, charge it 100% and return it to the store after I forcibly induce a deadboot and use the warranty to fix it.

What a waste of time. My trust in Poco has left to never come back, since the phone is from a May 2021 batch, and they still made it and sold it knowing it has this fatal flaw.

Thanks again for this post and my special thanks to @Alecxs.
[POCO M3 Questions & Answers] ogy_j:
Incredible, i've tried everyday to turn on the phone and today it's start alone..

I've plug the charger then it show battery then i saw the phone booting by itself

I don't know how but i'll try to not turning off

Now i've got a question i'm on firmware 12.5.4 and the latest is 12.5.5

Do you think i can update or it will black screen again ?

I think i also can't reboot it ?

No warranty because i bought it on aliexpress

Thx
[POCO M3 Questions & Answers] superman_199905:
Happened to me too, did what you told, worked like charm.
[POCO M3 Questions & Answers] MeMeMeOnlyMe:
At first, many thought that their phone had run out of power due to this problem, but according to users, their device had enough charge before the process began, and after the process, even before the shutdown, their phone was connected to the charger. have been. Even after turning off, users have reconnected their phone to charging, but this problem has not been fixed.

Solve the problem of Poco M3 not turning on (method one)

According to Techtrends.news, to solve the problem of not turning on their Xiaomi Poco M3, many users first put it in Fastboot mode and from there, booted it back into the operating system. To do this, follow these steps in order.

To get started, your phone must be turned off first. Since your phone is currently turned off due to some update issues, press the power button plus the volume down key together to fast boot it and hold them for 4 to 5 seconds. Doing so will put your phone in fast boot mode.

In this step, in order to be able to turn your phone from fast boot mode to operating system, you have to press the volume down and power button again and hold them for a few seconds. This will take your device out of fast boot mode and return to operating system mode.

Try this first method to solve the problem of turning on Poco M3. Some users have solved this problem by doing this method, but if this way your phone does not return to normal, try the other methods that we introduce to you.

The Second and final solution to this problem is that you have to drain your battery completely. To do this, set aside your phone so that its battery level drops to zero percent and turns off.
[POCO M3 Questions & Answers] rohith_rls:
it has heat sink problem, if you leave it to drain ,it may work after 2-3 daysor else u can remove that capacitors and place it again.
[POCO M3 Questions & Answers] animenald:
After the brick and following the fix made (removing shield), My power button as well as volume up and down button are not functioning. Please help.
[POCO M3 Questions & Answers] animenald:
Problem solved... need to put the screws.. thanks
[POCO M3 Questions & Answers] animenald:
Although when I turn it off, I cannot boot it again. Sad..
[POCO M3 Questions & Answers] dfight:
2022/07/08 newest miui global 12.5.6 stable poco m3 citrus

12.5.6.0(RJFEUXM)

android 11

I update 21 app from google store then think I need to clean and spped up phone.

Open security app and cleaner to clean all cache then boost speed to clean ram.

Security scan to secure phone.

Reboot. Brick my phone.

Omg. Newest miui and it happen to me?

I found out this discussion. Thank you guys.

My solution is removing SIM card, SD card.

Power button + volume down to go in fastboot mode.

Then XiaomiADBFastbootTools to reboot to system.

(Thankyou4allthework #281 in this discussion)

stuck at mi logo.

power button for few minutes then black screen.

Again in EDL....Suck!

Retry power button + volume down to fastboot mode

XiaomiADBFastbootTools to reboot to system.

stuck at...MIUI logo.....what? do we have MIUI logo?

Retry again.

O M G! My phone revive! thx you all guys thx.

But my problem is...could it happen again?
[POCO M3 Questions & Answers] Ivan1967:
I removed heat sink without heating, only brute force, but carefully. Put the pieces together, put on charger and it turned on immediatelly. Did a factory reset, updated to MIUI 12.5.6. No deadboots anymore. Thanks for solution, I couldn't imagine how sloppy design this was. Shameomi...
[POCO M3 Questions & Answers] ogy_j:
didn't reboot yet

but do you think removing the shield + the 2 capacitor is the solution ?

(end of the video)