Lenovo G510 Slow Charging Problem

[ay_erdi]

Hi everybody,

I have a lenovo g510 laptop.this laptop has a slow charging problem.I check for motherboard disassembly.I checked visual inspection and I did not meet negative components.

At this time turn on only battery mode.Does not lit charging led and wont charging battery when attached adapter.

How can I do ,I need your helps.

[mon2]

Re: Lenovo G510 Slow Charging Problem

Hi. Board # = LA-9641 ?

See attached.

Charger IC is PU301.

Connected the power adapter. Meter in DC volts mode (30V or higher is ok).

Measure the voltage to ground of ACDET pin # 6.

Post the measurement.

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

I'm so sorry forgotten write motherboard model.mobo model yes LA-9641P REV 1.0.

Plugged only adapter,on PU301 Acdet6 2.906 DC V

[mon2]

Re: Lenovo G510 Slow Charging Problem

This is a good voltage. Carefully measure the voltage to ground of each pin on the charger IC.

Post the measurements and the pin numbers.

Slow charging may be if the power adapter is not of the proper rating. Is the power adapter the original and the correct one for this laptop?

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Power adapter 20V 3.25A,battery original lenovo equipment and correct for this laptop.

PU301 pin voltage,

1-0.009 V
2-0,011 V
3-0,206 V
4-0.206 V
5-0,014 V
6-0 V
7-0 V
8-0 V
9-0 V
10-0 V
11-1,5 V
12-0,076 V
13-0,076 V
14-0 V
15-0,014 V
16-0,014 V
17-0,014 V
18-0,069 V
19-0,070 V
20-19,77 V

[mon2]

Re: Lenovo G510 Slow Charging Problem

Double check your list. ACDET (pin 6) is now 0 volts? Then the power adapter is not connected.

Also check REGN after ACDET pin is ok.

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Checked ACdet pin 2.906V ok but regn pin 0.014V

[mon2]

Re: Lenovo G510 Slow Charging Problem

Remove all power. Measure the resistance to ground of the REGN pin.

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

1.152 kOhm

[mon2]

Re: Lenovo G510 Slow Charging Problem

There should be a cap on this REGN pin nearby.

Flux and carefully remove it. Then check the resistance again on this pin. Low air pressure so parts do not fly off the pcb.

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Which one? I could not find

[mon2]

Re: Lenovo G510 Slow Charging Problem

It is PC312 - see attached.

Let me find it on the boardview file.

Attached is the BV file for the LA-9641P.
https://www.badcaps.net/forum/showthread.php?t=117884

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Remove pc312 after measurement, 1,282 kohm

[mon2]

Re: Lenovo G510 Slow Charging Problem

This capacitor does not seem to be at fault. For now, keep the cap off the board.

With no power to the logic board, use the meter in DIODE mode.

One meter probe on the REGN pin, other meter probe on the other side and of the black part which is the diode.

What is the measurement?

Then reverse the meyer leads.

What is the measurement?

Checking to see if the diode is defective and may be leaking. If the diode is ok, it appears to me that this charger IC may be defective. The LDO that is internal should output 6 volts unless there is an excessive load on the REGN pin.

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Regn with diode black side at measurement,

Multimeter short circuit bipp sounds come.multimeter probs change to regn and diode black side same situation.

[mon2]

Re: Lenovo G510 Slow Charging Problem

The meter is tone beeping in both direction checking? This is not normal for diode mode checks. It should tone beep in one direction only and block in the other.

Carefully flux and lift one leg of the diode to remove the diode out of the circuit.

Then repeat the same tests as above in diode mode.

Do you still hear the tone beep in both directions of the probes?

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Yes meter tone is beeping in both direction. I tested alone pd301 diode .the meter is showing only one direction 0.290 V,changes the prob direction no showing value and does not beep.

Should I take it out again the pd301 diode on motherboard and test?

[mon2]

Re: Lenovo G510 Slow Charging Problem

Diode is ok. Leave the one leg of the diode lifted up.

Use the diode mode test again but place the probes on the diode pads. The actual diode will still be lifted up.

Test the diode pads in both directions with the meter.

What are the measurements?

[ay_erdi]

Re: Lenovo G510 Slow Charging Problem

Removed completely pd301 diode on board.
Test diode anot(picture big ball) pads multimeter tone is beeping both directions.

[mon2]

Re: Lenovo G510 Slow Charging Problem

With the diode removed or disconnected, no power to the logic board, what is the resistance to ground of the REGN pin?

Has this board been worked on before your review?