Battery not Charge NM-B421

[Inforgalaxie]

Hello i have this circuit and my battery not charge.
I was changed PU101, PQ103,PQ101,PQ102, the battery and the problem is the same.

When the bactery is conected:

PQ103:
pin1: 19v
pin4: 19v
pin5: 11v

when the bactery is not conected:

PQ103:
pin1: 19v
pin4: 8v
pin5: 19v

Why works the opposite? EC Problem and need programing?

[piernov]

Re: Battery not Charge

NVDC should not produce 19V on main power rail.

[Inforgalaxie]

Re: Battery not Charge

Yes is true.. What can be...

[mon2]

Re: Battery not Charge

Which model / make of unit are you repairing? Is there a full schematic in the schematic forum? Post only the links here (not the schematic).

[Inforgalaxie]

Re: Battery not Charge

This is the schematic.

BQ25700
PIN18 -- Cell Batpres have 0.09V
PIN 7 -- VDDA have 0.14V

There is anything wrong...

ALL BQ25700 Voltages with battery conected: >>lenovo e580

1- 20v
2- 20v
3- 20v
4- 3,27v
5- 0,14v
6- 0,28v
7- 0,14v
8- 0,06v
9- 0,09v
10- 0v
11- 1,82v
12- 3v
13- 3v
14- 0v
15- 1,14v
16- 0,08v
17- 0,13v
18- 0,09v
19- 10v
20- 10v
21- 19v
22- 19v
23- 20v
24- 19v
25- 19v
26- 0v
27- 0v
28- 6,8v
29- 0v
30- 20v
31-20v
33-20v
VDDA , ILIM_HIZ, CELL BATPRES WITH 0V ITS NOT NORMAL...

[MOD EDIT]
Link to schematic https://www.badcaps.net/forum/showthread.php?t=85795

Reminder: rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483
.

[mon2]

Re: Battery not Charge

Investigate the resistance across PR112. Remove all power. Meter in lowest resistance mode.

Check the resistance across PR112 which should be ~10 ohms. This resistor is mated with REGN and you have posted REGN (pin #28) = 6 volts. VDDA is the other side of PR112 so VDDA should be ~6 volts. If it is not, PR112 is defective.

[Sephir0th]

Re: Battery not Charge

As piernov already highlighted, a NVDC circuit should not deliver 20Volts at B+ and especially no 20V at the BATT+ rail. The simplest reason is usually the right one. A internal shorted PQ101 (or PQ102?) or even worse: You have these Dual-Mosfets not replaced with compatible components? But since you figured also some wrong /missing voltages around the charging controller the issue could be there instead, yes.

This would be clarified immediately as soon as you share pictures of your work with the replacements visible.

[Inforgalaxie]

Re: Battery not Charge

PR112 is gone..not have This resistor in motherboard...maybe when i used hot hair was remove This resistor..

[mon2]

Re: Battery not Charge

Post a clear picture of this missing part. It is required to be onboard but a solder short will also work in its place. Want to review the pcb pads where this part was located.

Remove all power. Meter in resistance mode. Measure the resistance across the 2 pcb pads for this resistor. What is the resistance?

[Inforgalaxie]

Re: Battery not Charge

Ok I will test and will post results.

[Inforgalaxie]

Re: Battery not Charge

I am testing...