Asus G712L laptop does not charge, does turn on with battery.

[SarcasticOP]

I have a laptop that does not charge, but will turn on, so I believe this is in the charging circuit. I see not heat under thermal camera so no obvious shorts that are easily detectable from that. I am not too familiar with schematics and how to read them.

I know it is taking 20v in at the barrel jack connector, but since I am not familiar with this motherboard, not too sure how to follow power rails to nail down the problem.

Sorry I cannot provide more info, but I can answer questions if you have any.

Board: G532LWS Rev 1.3

Boadview and Schematic

[Sephir0th]

Picture of the area with the DC-IN Mosfets and of the charging controller including surrounding circuit please.

Or are you able to find and measure everything on the base of the designations in the schematics?

[SarcasticOP]

Picture of the area with the DC-IN Mosfets and of the charging controller including surrounding circuit please.

Or are you able to find and measure everything on the base of the designations in the schematics?

Not super strong with reading schematics, I get lost pretty quickly.

[Sephir0th]

Then picture of the charging controller and surrounding circuit too please. Should be a BQ24780S iirc.

Edit: And resistance between these two points please (Source and Gate) to start with.

[SarcasticOP]

Then picture of the charging controller and surrounding circuit too please. Should be a BQ24780S iirc.

Edit: And resistance between these two points please (Source and Gate) to start with.

2.176Mohms

[Sephir0th]

So the DC-IN Mosfets are most likely fine.

Plug the charger and measure voltage at the following 4 points: ACDET, VCC, REGN and ACDRV. Pay attention to not slip with the probes.

[SarcasticOP]

So the DC-IN Mosfets are most likely fine.

Plug the charger and measure voltage at the following 4 points: ACDET, VCC, REGN and ACDRV. Pay attention to not slip with the probes.

All are showing 0v, everyone other than 3 is showing OL in diode mode.

[Sephir0th]

All are showing 0v, everyone other than 3 is showing OL in diode mode.

If the charger was plugged as advised then there is something wrong at the very beginning of the power path.

Measure voltage and resistance to GND of these two points please. Resistance to GND measurements always without power.

Is the charger known good, of correct voltage and current?

[SarcasticOP]

If the charger was plugged as advised then there is something wrong at the very beginning of the power path.

Measure voltage and resistance to GND of these two points please. Resistance to GND measurements always without power.

Both sides are reading 1.715 in diode mode, no voltage on either side. It is plugged in and can verify 20v at barrel jack.

Is the charger known good, of correct voltage and current?

Yes, known good. I have two chargers that both work on my laptop.

EDIT: Test points start at 4.7Mohms and drop down to 0, and then the process resets.

The R005 resistor below the leftmost mosfet does have continuity from side to side.

[Sephir0th]

Both sides are reading 1.715 in diode mode, no voltage on either side. It is plugged in and can verify 20v at barrel jack.

When I say "resistance" or "resistance to GND" then you are supposed to take measurements in Ohms mode please. Not diode mode. Next time please.

You are saying there isn't voltage at any side of theae inductors when charger is plugged? Confirm please!

[SarcasticOP]

When I say "resistance" or "resistance to GND" then you are supposed to take measurements in Ohms mode please. Not diode mode. Next time please.

Sorry about that, I added it into the edit afterward, I normally work in diode mode, so that is what I defaulted to.

You are saying there isn't voltage at any side of theae inductors when charger is plugged? Confirm please!

No voltage at all. I can send a picture to confirm if you would like.

[Sephir0th]

Sorry about that, I added it into the edit afterward, I normally work in diode mode, so that is what I defaulted to.


No voltage at all. I can send a picture to confirm if you would like.

Using diode mode for resistance measurements is bad practice, since each multimeter works with a different test current which will result in different values who are not really comparable anymore. When you work with me, we will always work in Ohms mode, even if it is a MacBook...

However, when you say, the charger is working, then the DC-IN Jack must be faulty (Broken/Loose Pins/something else)

You are absolutely sure about that? Double-checked your GND, etc.?

[SarcasticOP]

Using diode mode for resistance measurements is bad practice, since each multimeter works with a different test current which will result in different values who are not really comparable anymore. When you work with me, we will always work in Ohms mode, even if it is a MacBook...

However, when you say, the charger is working, then the DC-IN Jack must be faulty (Broken/Loose Pins/something else)

You are absolutely sure about that? Double-checked your GND, etc.?

I will order and replace the DC-IN jack and we can go from there. I think that is the best case scenario

[SarcasticOP]

Thank you for your help btw, I hope I can get this good some day ha ha

[Sephir0th]

I will order and replace the DC-IN jack and we can go from there. I think that is the best case scenario

It should be somehow possible to test whether the jack is broken inside before making the next step ordering a replacement jack. When it isn't at fault, you will make a long face...
And even at this point it is somewhat hard to believe for me that this massive Jack has failed like that without obvious signs.