poco m3 does not turn on anymore

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Sus_i

Senior Member
Apr 9, 2013
1,603
690
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.

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...
 

Linuxkek

Senior Member
May 29, 2019
380
64
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...
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.
 

b1.b0r4

New member
May 3, 2022
1
1
@TuneIn CaviteRadio
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
 
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n53r10us

Member
Feb 12, 2022
11
0
Why not? Isn't a soldering station even better than a crappy heat-gun?

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?
 
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Sus_i

Senior Member
Apr 9, 2013
1,603
690
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?
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...
 

sarabbafrani

Senior Member
Dec 20, 2012
56
48
isfahan-IRAN
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...
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
 
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Aicene

Member
Aug 7, 2015
49
19
Riga
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
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???
 
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Warbaby77

New member
May 5, 2022
1
0
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.
 

Sleltry

New member
May 15, 2022
1
1
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
 
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Elijahfrodo

New member
Dec 21, 2017
2
2
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
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
 

ogy_j

Senior Member
Jul 9, 2011
181
27
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
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
 

zaki789

Senior Member
Jul 22, 2019
65
5
Alger
Xiaomi Poco F3
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
 

sukinsyn

Member
Mar 13, 2013
5
0
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
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?
 

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  • 8
    permanent and ultimate fix. just remove shield
    then reassemble phone

    * There is no isolation ( inner side of shield)
    To prevent contact between capacitor and shield then we can isolate it or just removing that shield

    Just do it with edl (Qualcomm 9008) condition (your pc will detect it when installing that driver in device manager ports)

    After that all if any problem persistent connect with my WhatsApp i will answer
    +989131074612

    youtube:
    any questions? connect with my WhatsApp
    i will tell details
    4
    - CONFIRMED! -

    I was little suspicious about @sarabbafrani advice, but it actually worked!

    My Poco M3 went nuts after shutting down the alarm clock, only few symbols visible on the screen but otherwise totally unusable. I was able to power up the screen or shut it down but couldn't access the phone software. Only option was to reboot or shutdown with power button.

    After reboot, the phone went totally dead. Couldn't boot up, not with long press power or power + volume up (or down). Plugging in the charger didn't do anything, no vibrations, nothing.

    I did that phone disassembly, remove battery connector, push power button and plug battery again = normal boot. After this happened about 3 times within a month, I decided to try sarabbafrani solution.

    Tear down the phone, remove plastic main board cover, took all 3 cameras away, disconnected antenna and took the main board away.

    I had only hot air gun and decided to cover other parts with aluminium foil. First, I tried speed 1, but no success. Then full power, 5-10 sec blowing 10cm distance, firm grip with pliers and heat shield was out. It almost fell down. Do not use excessive force!

    After cooling down I put motherboard back in and tried that same procedure with power button + battery cable in = nothing :( I thought I fried the whole thing. But when I plugged in the charger it showed the Poco logo and battery level - that's new. Decided to put everything back together.

    It required a long press for power button and the phone started normally! I even did a software restart and it started normally. Charging works also normally.

    I've been using it now only for few hours but hopefully the fix is permanent.

    2.jpg


    1.jpg
    3
    If the draining battery method worked for you, you should do the mentioned fix...
    Otherwise the deadboot can happen anytime again. Worst case, in between an update or something like that.
    It depends on distance between shield and capacitor
    In some cases these two contacted all times
    In other cases if main board gets warm then capacitor connects to shield it will gets warmer and more battery usage
    I didn't have a soldering station or a heat gun available and since the alternative was to throw everything in the garbage, I removed the shield in a somewhat barbaric way. I took a fixed screwdriver with a wide tip and inserted it in the middle and with a little pressure the shield came off
    🤦🤦🤦 Do not attack in this way
    I should tell it for all owners
    1.Take off all cameras 2. Be careful about plastic parts 3. Cover all other parts from heating 4. Carefully heat that ic shield about 380-400°C 5. Carefully picking up vertically with Tweezers (be careful for shaking , pcb is hot with parts under shield ic and caps)
    Heat untill shield base solder gets weaker
    Pick it up without force because pcb ways may broken and affects on mobile network amplifier
    You can test mobile network with this code
    *#*#4636#*#* gsm only lte only and wcdma only
    Image attached, pcb damage after removing shield cold
    3
    permanent and ultimate fix. just remove shield
    then reassemble phone
    youtube:
    any questions? connect with my WhatsApp
    i will tell details
    Thnx my Poco M3 is now able to restart even shutdown. It always Boot.
    3
    FIX , FIX, FIX. My poco m3 stopped booting up/recovery/bootloader. Tried disconnecting battery connector, display connector, reheating but nothing worked permanent. Only solution was to wait for the battery to drain after which charge it enough to boot it. That worked but i couldn`t use recovery or bootloader until battery discharged and then booted it to recovery/bootloader as first boot. I contacted my friend from whom i bought the device from. He said its possibly due to some short circuit and all i had to do was clean the charging port (where the charger is connected) and the ear phone plug port with a tooth brush (bristles of tooth brush should be straight) dipped in 3-4 drops of petrol. At the time my phone was dead and was waiting for the battery to drain. However i followed my friends instructions and cleaned the charging and ear phone ports. After allowing the ports to dry i tried to boot the phone. It didn`t boot remaining dead. I had to wait a day+ for the battery to drain. I then charged it until it booted. I then tried to reboot it into bootloader and it WORKED. I treid recovery and it WORKED. Now AlhamdoLILLAH my phone is good as new except the marks on the cover made when i removed the cover. Try your luck Gentlemen.