ASUS ROG G14 (GA401) battery spark, dead.

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Voltage please or both?

Here you go

Resistance reading were done with no ac and battery, voltage reading were done with both battery and AC plugged in.

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Voltage please or both?

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

What are the new measurements are the bq chip?

Resistance or voltage?

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

The mosfet readings look ok.

How confident are you with the charger IC replacement ? My usual suggestion is to flux the part well and reflow it with low air pressure in a circle till the part swims into place.

Use the gentle nudge of the tweezers when the solder is in liquid form to make the part 'dance'. The part should push away and naturally bounce back onto the pads. Never push too hard else the pads can be ripped off the PCB.

That is normally how I do reflows as well, and I clean it up with my soldering tip afterwards, got some pics if you want to take a look.

[mon2]

Re: ASUS ROG G14 (GA401) battery spark, dead.

The mosfet readings look ok.

How confident are you with the charger IC replacement ? My usual suggestion is to flux the part well and reflow it with low air pressure in a circle till the part swims into place.

Use the gentle nudge of the tweezers when the solder is in liquid form to make the part 'dance'. The part should push away and naturally bounce back onto the pads. Never push too hard else the pads can be ripped off the PCB.

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

What are the new measurements are the bq chip?

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Ok. Then remove all power and check the resistance of the DC IN mosfets.

Meter in resistance mode (2k scale is ok).

Check each mosfet with meter probes across:

Source (1-2-3) & Drain (5-6-7-8)
Source (1-2-3) & gate (4)
Gate (4) & drain (5-6-7-8)

Post each measurement. Repeat for the 2nd mosfet. Checking for a low resistance = defective mosfet.

Also post the markings of each mosfet so we can find their datasheets (or a valid replacement).

Thanks, already purchased replacements for them, as it was easier to get all of them when I was already purchasing the ones at the IC charging area.

The PKCH2BB meassures:
S-D: 2.1 MOhm
S-G: No reading, (not 0 ohm, no reading at all.)
G-D: 5 MOhm

The M3058M meassures:
S-D 3 MOhm
S-G: 4.6 MOhm
G-D: No reading, (not 0 ohm, no reading at all.)

[mon2]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Ok. Then remove all power and check the resistance of the DC IN mosfets.

Meter in resistance mode (2k scale is ok).

Check each mosfet with meter probes across:

Source (1-2-3) & Drain (5-6-7-8)
Source (1-2-3) & gate (4)
Gate (4) & drain (5-6-7-8)

Post each measurement. Repeat for the 2nd mosfet. Checking for a low resistance = defective mosfet.

Also post the markings of each mosfet so we can find their datasheets (or a valid replacement).

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Are you confident that the mosfets were mounted with pin #1 = pin # 1 on the PCB ?

Remove all power. Meter in resistance mode.

Check the resistance with the meter probe on pin # 8 and # 7 = should be ~0 ohms.

Then pin # 8 and pin #5 ? Reading ?

Then 1-2-3 = should be ~0 ohms.

What is the resistance between pin 1-2-3 (source) and pin # 4 (gate) ? - if this is ~0 ohms then the mosfet has been soldered upside down.

Thanks, when you say pin #8 and #5, which do you mean? I did not touch the mosfets at the DC in, only down at the charging IC area.

[mon2]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Are you confident that the mosfets were mounted with pin #1 = pin # 1 on the PCB ?

Remove all power. Meter in resistance mode.

Check the resistance with the meter probe on pin # 8 and # 7 = should be ~0 ohms.

Then pin # 8 and pin #5 ? Reading ?

Then 1-2-3 = should be ~0 ohms.

What is the resistance between pin 1-2-3 (source) and pin # 4 (gate) ? - if this is ~0 ohms then the mosfet has been soldered upside down.

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Where is the +4v2 coming from (since the front side 2 x mosfets are not turned on) ?

Is there a battery connected ? If yes, remove it.

Mystery of the day, no battery is connected, I guess they must be in parallel with the input?

EDIT: The second mosfet at the input outputs 4.2v

[mon2]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Where is the +4v2 coming from (since the front side 2 x mosfets are not turned on) ?

Is there a battery connected ? If yes, remove it.

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

UPDATE!

Got the mosfets and BQ chip all soldered on, not shorts on the board afterwards.
Thought I was good, and assembled everything, plugged in the charger, and now nothing works, no lights, start button does nothing, charging indicator not showing, completely dead, machine wont start and USB charging also does nothing...

Double checked connections, and they are fine, disassembled the machine again, and did new measurements, can anyone help again? Still no shorts on board, nothing gets warm when plugged in.

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

You are welcome my friend.

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

By the way yougot nice equipmant much better then mine i must urgent upgrade my equipment.

If your equipment works, then don't upgrade, I worked in the electrical industry for a couple years, so my Fluke is leftover when upgrading etc.

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Yes local electronic store , aliexpress , or ebay i order also i have no shop or tax number so i am obligied to buy in such store, if you got a tax number you can buy by farnell, tme , digikey and etc. Awesome we could find the cultprit of the problem of your laptop. I am sure for 98 procent if you replace the components the laptop will work, good job ��

All thanks to you, would not have figured out this myself! When I come by Belgium, I'm getting you a beer!

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

By the way yougot nice equipmant much better then mine i must urgent upgrade my equipment.

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Yes local electronic store , aliexpress , or ebay i order also i have no shop or tax number so i am obligied to buy in such store, if you got a tax number you can buy by farnell, tme , digikey and etc. Awesome we could find the cultprit of the problem of your laptop. I am sure for 98 procent if you replace the components the laptop will work, good job ��

[jacobtc]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Yes those two

Awesome! I will report back when the mosfets arrive, and the new BQ IC.. China shipping, so it might take a while
Do you get your components from China as well, or have you found a better place to get them?

[Stevedb]

Re: ASUS ROG G14 (GA401) battery spark, dead.

Yes those two