eg50-kb mb 12253-3m not charging battery

[brumbrum]

Acer aspire e1 522 with eg50-kb mb 12253-3m board.
Laptop works fine without battery (14,4v battery AL12A32, tested several batteries).
With battery inserted:
- I got orange light
- battery % doesn't increase
- BT+ on connector with battery is 12.60v (too low to charge battery), without battery BT+ is about 5v

I attached a capture of the schematic with all the voltages measured (in light blue) on charger ic.

What could be the problem?
Thank you

[Techtiger]

Re: eg50-kb mb 12253-3m not charging battery

When you mesure the voltage was the VIN & Battery were connected? The voltage on BQ24727 pin 3/4/9/8/18/16/17 are not perfect

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

yes, all voltages measured with battery + ac adapter

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

I attached a second pic with voltages checked again and indication on pin 11 that was missing.

[mcplslg123]

Re: eg50-kb mb 12253-3m not charging battery

ACDET should not be 0. ACN/ACP reading-are u sure?? Both pin should show almost similar voltage.

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

100% sure of those voltages.
The only strange thing related to the schematic is that if I try to follow the schematic, pin 4 of pu4404 is connected with pin18 of pu4403. Actually on the board it's not like that.
In the photo attached there are the readings voltages on pc4413.

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

It's also strange that IOUT is 0 volt, but since I have led and laptop knows battery is connected the SIO is working.
Can someone help me? Or has someone the right value of the resistor to checj them? Thank you

[Styopa]

Re: eg50-kb mb 12253-3m not charging battery

Voltage on 1 and 2 pins BQ24727 should be ALMOST THE SAME.
Check PG4402

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

I don't have PG4402 on board and no boardview.
I attached a rar with datasheet and schematic (even if it's a bit different form my board, but almost equal), and also a video of behaviour.
You can see the right 16v (needed to charge the 14v battery pack) for 1 second and after, there is stable only battery pack voltage (14v), like something cut the 16v needed to charge battery.
Connector all pins are ok.
2 battery tested, some behaviour.
SIO and data lines should be ok, cause if I charger externally the battery, pc can read the right %, but doesn't charge battery.
Without battery plugged I got only 5.82v only B+.
Since this chip from datasheet can be managed to charge 12v or 14v batteries, what could be the problem?
This case is really strange, and this laptop is making me crazy

[Styopa]

Re: eg50-kb mb 12253-3m not charging battery

Are the voltage on 1 and 2 pins of BQ24727 is the same? If not, look for why.

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

Thanks for tour reply.
No, they aren’t as you can see.
On pin 1 19 volt, and on pin 2 battery voltage.
But I’m not realizing what’s the problem

[Styopa]

Re: eg50-kb mb 12253-3m not charging battery

OK. turn on without battery and measure voltage on 1 pin and 2 pin adn write here.

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

Ok no problem. Tell me what you need, and I'll do it, and thanks for your help.
without battery connected:
pin 1 BQ24727 19v
pin 2 BQ24727 5.82v

[Styopa]

Re: eg50-kb mb 12253-3m not charging battery

pin 2 BQ24727 5.82v - check (replace) resistor between 1 and 2 pin

[brumbrum]

Re: eg50-kb mb 12253-3m not charging battery

The problem is that, if you mean PR4404, I checked it with tester, and it's ok, but maybe the schematic it's a bit different from my board, cause on pin 1 and 2 of pr4404 there is no continuity with pin 1 and 2 of BQ24727.
So I checked the resistor in photo on green line close to BQ24727, without id on board, and I' ve reported the continuity to understand the circuit in photo attached