Dead ASUS ROG G14 (GA401)

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

BATPRES is an active LOW signal. So when the battery is present, this pin should be low = 0 volts.

Remove the battery and this voltage should become a logic high value. Confirm it.

Measure the voltage to ground of each pin on the battery connector.

Post all measurements.

BATPRES is still low (0V) without battery.

All battery pins on board measure 0V.

[mon2]

Re: Dead ASUS ROG G14 (GA401)

BATPRES is an active LOW signal. So when the battery is present, this pin should be low = 0 volts.

Remove the battery and this voltage should become a logic high value. Confirm it.

Measure the voltage to ground of each pin on the battery connector.

Post all measurements.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Bumping this thread in hopes of support for another thing wrong with this.

I finally received my battery, however Windows does not detect it charging at stays at 1%.
Battery norminal voltage is 15.4V, but is currently stuck at 15.1V and does not increase. Checked BQ, ACDET is 2.7V, ACOK is 6V, however BATPRES is 0V Is this a faulty aftermarket battery, or is something else wrong?

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Not advisable to "unlocking" batteries.Often the battery management PWM goes into protection when you dis connect cells. Need programmer to unlock that protection. I tried it on 2-3 batteries in my spare time and was able to fix only one out of three. The cost,energy and time simply dont make any sense. I just did it once for my own experience sake.

Alright, it just feels wasteful to throw out good cells. This is the third time doing it.

[mcplslg123]

Re: Dead ASUS ROG G14 (GA401)

Not advisable to "unlocking" batteries.Often the battery management PWM goes into protection when you dis connect cells. Need programmer to unlock that protection. I tried it on 2-3 batteries in my spare time and was able to fix only one out of three. The cost,energy and time simply dont make any sense. I just did it once for my own experience sake.

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

Unfortunately not. I don't do that at all since this is only hobby for me. it just isn't economical for me tonsource a suitable device along with the mess to replace cells and all these things. Maybe someone else can help for this question.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Good to know, the thing you pointed out in the schematics is just feedback Reference voltage and has nothing ro do with the actual output of the Phase anyway.

Now I'd be happy if the issues stop from now on...

Got Windows installed, and everything seems to work but the battery, so I will have to look into that... Have you had any luck unlocking batteries?

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

Good to know, the thing you pointed out in the schematics is just feedback Reference voltage and has nothing ro do with the actual output of the Phase anyway.

Now I'd be happy if the issues stop from now on...

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Great success! New BIOS fixed it! Got it all stripped down to test, but it outputs display!
Now to figure out if the battery is salvable. I've had three generations of these G14, and common for them all is that they lock/kill the battery if anything happens with the board...

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

It is GND and the "diode" is probably a Capacitor. Maybe we are on something with the 1.2V there, though. Detailed inspection of the circuit necessary, but not today (at least for me^^)

Is this the expected voltage for VRAM described in the schematic? Page 78.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

I strongly suggest to forget this area immediately. That's for battery charging and has nothing to do with your issue. Voltage without battery present is useless and meaningless.

Edit: except you measure a short to GND at the coil.

Alright

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

Alright, but I am guessing 0.2V isn’t normal either, right?

I strongly suggest to forget this area immediately. That's for battery charging and has nothing to do with your issue. Voltage without battery present is useless and meaningless.

Edit: except you measure a short to GND at the coil.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

It is GND and the "diode" is probably a Capacitor. Maybe we are on something with the 1.2V there, though. Detailed inspection of the circuit necessary, but not today (at least for me^^)

Alright, but I am guessing 0.2V isn't normal either, right?

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

It is GND and the "diode" is probably a Capacitor. Maybe we are on something with the 1.2V there, though. Detailed inspection of the circuit necessary, but not today (at least for me^^)

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Im sorry if this is a stupid question, but is this side ground? It measures 0.12 ohm, but the ?diode? Right above measures 20V on one side and 0V on the other… It just seems like the area marked with blue does not turn on, all measure 0-0.2V when plugged in and does not change when power button is pushed.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

unfortunately 35 Ohms are perfect, so still no clue and i guess when you measure again, the 1.35V +FBVDDQ is coming up there?

i have not much hope left for this device to be honest. Maybe, to rule out a corrupot BIOS will be worth a try.

1.2V is measured on both coils.

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

unfortunately 35 Ohms are perfect, so still no clue and i guess when you measure again, the 1.35V +FBVDDQ is coming up there?

i have not much hope left for this device to be honest. Maybe, to rule out a corrupot BIOS will be worth a try.

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

Neither boardview nor schematics seems to match exactly for this board. Maybe someone can enlighten me regarding this issue.

However. Neither 0 Ohms, nor O.L. is a normal value for +FBVDDQ and i'm pretty confident, that's the rail we're dealing with.

So please check again. Try to exclude some kind of contact issue with your probes, maybe by measuring each coils between both pads (they should show short ofc).

Yeah, the boardview and schematic is for a different model, but was the closest I could find. I just checked from a grounding point to both sides of the coils...

EDIT: You were right, I get 35ohm on both sides on both.

[Sephir0th]

Re: Dead ASUS ROG G14 (GA401)

Neither boardview nor schematics seems to match exactly for this board. Maybe someone can enlighten me regarding this issue.

However. Neither 0 Ohms, nor O.L. is a normal value for +FBVDDQ and i'm pretty confident, that's the rail we're dealing with.

So please check again. Try to exclude some kind of contact issue with your probes, maybe by measuring each coils between both pads (they should show short ofc).

[jacobtc]

Re: Dead ASUS ROG G14 (GA401)

I'm concerned about these two right now. Double-check voltage first. Then remove power and check resistance to GND at any coil, any side.

I have the feeling there could be a issue with the +1.35V supply for VRAM.

Is it possible to share the schematics or is it already shared somewhere and you can share the link?

Edit: somehow missed them completely. Thanks for pointing that out for me again...

Both measure OL, no shorts.

EDIT: I tested again, and I do infact get 1.2V on the two coils, just very shortly, which is why I missed it last time. Also, after removing the heatsink and fans, the laptop turns off faster (3-4 sec), I'm pretty sure it doesn't overheat, as the CPU and GPU is only slightly warm.
Sometimes the laptop stays on (light on) but no voltage on coils.. Very weird.