Xiaomi mimax - the phone turns on and off over and over again.

Hello,

I changed the battery in my phone, I wanted to check if it works and everything was fine. Unfortunately, I had a processed charging socket and I had to position the phone so that the charger would catch. As a result, it stopped charging several times before I was able to turn on the phone during startup. I decided to replace the USB socket. I replaced and now the charger is in good contact, but the phone only turns on to the Xiaomi logo and turns off again and again. Tried to turn on the phone on the charger itself, no battery but it's the same. Can anyone advise what happened? has the motherboard fallen? I do not have to do a hardreset because the battery is dead.

Plug in the old USB board and check.

nothing, the problem with turning on was already before replacing the usb board. It took place after replacing the battery, but at the beginning after replacing the battery, it started to charge, now it is as I write in the post. Should the phone turn on on the cable? No battery

Quote:

Should the phone turn on on the cable? No batteries

In the case of Xiaomi, or at least the models I have checked, no, it will not start without a battery. The symptoms you describe are, in turn, typical for a damaged or defective battery, so maybe the new one is not functional.

I keep on charging for an hour and it keeps turning on and off over and over again. I will order one more battery and see if it works

On the cable itself without a battery, it should not turn on. The problem may lie with the battery or a badly soldered charging input.

What voltage do you have on the new battery?

I do not know how to check, the battery has a ready connector on the "tape" and I have no way to apply the meter

Added after 12 [minutes]:

Boryc2014 wrote:

On the cable itself without a battery, it should not turn on. The problem may lie with the battery or a badly soldered charging input.

I replaced the entire charging model. I bought a new battery today from another company, I will see how it will come in two days if it will work

Well, try it and write if it has changed anything, because I'm curious myself.

Boryc2014 wrote:

Well, try it and write if it has changed anything, because I'm curious myself.

Approx. Waiting for the battery, it should come tomorrow

Unfortunately, the scenario after replacing the battery is the same. Any other idea? How do you bring your phone to life?

I would try to play with soft. Maybe he is dead. I don't think of any other ideas yet. Have you tried to connect it to the computer, does it detect it?

czartek70 wrote:

Hello,

I changed the battery in my phone, I wanted to check if it works and everything was fine. Unfortunately, I had a processed charging socket and I had to position the phone so that the charger would catch. As a result, it stopped charging several times before I was able to turn on the phone during startup. I decided to replace the USB socket. I replaced and now the charger is in good contact, but the phone only turns on to the Xiaomi logo and turns off again and again. Tried to turn on the phone on the charger itself, no battery but it's the same. Can anyone advise what happened? has the motherboard fallen? I do not have to do a hardreset because the battery is dead.

Without a battery, the xiaomi should turn on and run on a charger without a battery. But you need to reset it on the switch until it boots up. You have damaged the damaged charging system during a short circuit on the usb board. Check the fuse on the line and shorten it first.

Added after 2 [minutes]:

Boryc2014 wrote:

I would try to play with soft. Maybe he is dead. I don't think of any other ideas yet. Have you tried to connect it to the computer, does it detect it?

Xiaomi even blocks rollback, try to flash it with fastboot or with mi flash pro

c-y-r-u-s wrote:

Without a battery, the xiaomi should turn on and run on a charger without a battery. But you need to reset it on the switch until it boots up. You have damaged the damaged charging system during a short circuit on the usb board. Check the fuse on the line and shorten it first.

Are you sure? The models I checked didn't really want to do this. At best, they would remain turned on if the batteries suddenly died.

I am asking because I have Redmi Note 4 (the one on MTK) and the phone behaves strangely after the customer tries to replace the battery with the 4X. The one here, when you try to charge with the turned off, shows information about the truth that the battery temperature is too low and prefers to disconnect the charger. When you try to turn on, it usually restarts on the logo, like this Mi Max, but from time to time, if the charger is connected, it will start, display a message that the battery temperature is low and it works, even charging the batteries. After disconnecting the charger and restarting the phone, only an eternal bootoop again. The only damage I could see is the lack of 2 capacitors near the battery connector, but looking at the diagram, it is rather related to the RF Switch (RF1643A) and filling the gaps does not change much. The rest looks normal.

I also had a 2s mix in my mix.
After a few hours of fighting, I started pressing the power button several times per second until the system woke up and came to life.