Asus TUF Gaming F16 (2024) FX607J no power no ACDRV

[mon2]

So U6000 is the ovp device that may have triggered.

What is the voltage to ground of the removed resistor, pin #2? Measure the voltage at the pcb pad.

[zaurus81]

pin #2 of the resistor has 0.009 V

[mon2]

Flux and carefully remove capacitor C60018. Test again without this part onboard.

[zaurus81]

do I put everything back (sense resistor, transistor, resistor) except the capacitor C60018?

[mon2]

For now - leave the others off as well since the voltage on ACN continues to be present. Suspecting the leak is from this capacitor that bridges across pins #1 & #2.

[zaurus81]

with c60018 removed i always have this fu***ng 4.3 volt on main

[mon2]

Unbelievable. With the current sense resistor (and this removed cap) off the board, what is the resistance between pin #1 and #2 on the charger IC?

[zaurus81]

I thought about something. Tell me if it makes sense. The main power line that has 4.3 volts is called PVBAT. If I analyze the boardview I see that it is connected to a series of other lines via pads (PAD6110, PAD6160, PAD6110 and so on). These pads can be separated because they are made of tin. If I separate all the pads I can see if I remove these 4.3v. If they disappear, I reunite all the pads one at a time testing from time to time until I find the responsible sector. What do you think?

[zaurus81]

Unbelievable. With the current sense resistor (and this removed cap) off the board, what is the resistance between pin #1 and #2 on the charger IC?

10.87M ohm

[mon2]

Test the resistance between these referenced points (PVBAT) to ACN. Do they appear as a short?

[zaurus81]

Test the resistance between these referenced points (PVBAT) to ACN. Do they appear as a short?

No, they have all the same resistance, 13M ohm

[mon2]

Suggest to remove the charger IC off the board to confirm if there is an external leak or is it that this charger IC is linked to this mystery voltage. If the current sense resistor is removed, you should have 0v on ACN.

[zaurus81]

Suggest to remove the charger IC off the board to confirm if there is an external leak or is it that this charger IC is linked to this mystery voltage. If the current sense resistor is removed, you should have 0v on ACN.

With Charger IC and sense resistor removed from the board, i always have 4.3 volt on ACN

[mon2]

Test if this voltage is present on each inductor on the board. Also test if you see this voltage on any of the mosfets linked to the battery charger. A p-channel mosfet will enable under these conditions.

[zaurus81]

Test if this voltage is present on each inductor on the board. Also test if you see this voltage on any of the mosfets linked to the battery charger. A p-channel mosfet will enable under these conditions.

the voltage is absent on each inductor except the one that charges the battery. I write the voltages in a photo. I don't see any p-channel mosfets, they are all n-channel. See boardview

these 2.4 volts, with time (a few minutes), drop to 0.8v
all these values are strange since the n-channel gates are at 0V (board without sense resistor and bq24800)

[mon2]

Flux and remove the 2 mosfets that are showing the 4v2 measurement. Test again. Does the 4v2 on ACN halt?

PS: This board needs an exorcism.

[zaurus81]

Flux and remove the 2 mosfets that are showing the 4v2 measurement. Test again. Does the 4v2 on ACN halt?

PS: This board needs an exorcism.

maybe an "avada kedavra"🤣

same story.....4.3 present

is it normal to have prochot# at 0v on bq? something releted to absence of original charger??

[mon2]

Can you confirm the wiring of your power supply to this board is of the correct polarity?

[zaurus81]

Can you confirm the wiring of your power supply to this board is of the correct polarity?

i don't understand the question. see photo

[rogfanther]

Just a veeery long shot, but isn´t this one of those boards that have a tiny switch inside the power jack, that is activated when the psu cable is inserted ? Can you try with a psu, even disconnected from mains, and see if the voltages change ?