search

Xinyuan-LilyGO / LilyGo-T-SIM7080G

47 stars 24 forks source link

The battery has stopped working #47

Closed manzajaro closed 5 months ago

manzajaro commented 6 months ago

Hi, after several days of testing a code and battery life, it turns out that this morning the battery-only power supply stopped working and I don't understand why.

I'm compiling with these options!

image

I've taken measurements with the multimeter and I can see that the PMU is getting 4.1V.

I've measured all the resistors in the schematic and they give the correct value.

When I run the code connected to the usb cable it works correctly, but as soon as I remove it the device switches off.

The power button works correctly, because when it is powered by usb I press it for X seconds and the device turns off.

I run the following code MinimalPowersExample to see if the PMU is OK and it returns the following result.

image

Can someone help me, thanks

lewisxhe commented 6 months ago

image Is the switch turned on?

manzajaro commented 6 months ago

Hi @lewisxhe,

The button is on, the battery is charged and I've been able to check that the PMU receives 4.1v from the battery.

https://github.com/Xinyuan-LilyGO/LilyGo-T-SIM7080G/assets/6926926/30cd97de-9abf-46dc-b8fc-19a7ff6d2fd1

lewisxhe commented 6 months ago

Can you follow the instructions here and remove the diode and then run the MinimalPowersExample to see if the battery prints a connection? Now due to the presence of this diode, the battery connection will print even if the battery is not inserted.

https://github.com/Xinyuan-LilyGO/LilyGo-T-SIM7080G/issues/49

manzajaro commented 6 months ago

Can you follow the instructions here and remove the diode and then run the MinimalPowersExample to see if the battery prints a connection? Now due to the presence of this diode, the battery connection will print even if the battery is not inserted.

I'll do it now and tell you the result.

This is the consumption of the board, when it is switched on and the pwr button is pressed.

image

Thanks @lewisxhe

manzajaro commented 6 months ago

Logs with the diode removed, as you can see it detects well. 1st logs without battery, then inserted and detected.

image
lewisxhe commented 6 months ago

Can detect battery insertion and removal, but cannot use battery power?

manzajaro commented 6 months ago

Correct, the battery alone doesn't start. You've already seen the power consumption measurements of the board.

It stopped working on its own, it was undergoing a test throughout the whole night and the next morning the board wasn't functioning and the battery was charged.

Edit: It seems that today the motherboard won't start; it's not recognized by the computer. Only the blue CHG LED is blinking, but nothing else happens. Has the PMU died? :(

lewisxhe commented 5 months ago

As you said, the battery path inside the AXP2101 chip may have been disconnected. Please contact your dealer for after-sales service.