NEED A PICTURE - ASUS TUF A17 706N - DAONJXMBACO REV: C

[khaahk]

As there is nothing new to go on, the battery is communicating, the only thing for now is to check the first mosfets for short. If there was a short earlier on the board they might have suffered.

[Pierro208]

I checked the input MOSFETs, they are good, I changed them anyway, and rechecked those of the charging circuit, no change, still no charging

[mon2]

See your post # 6. With adapter AND battery, BATPRES# remains a non-zero voltage value?

The '#' means the signal is an active LOW signal. When this line is LOW = 0v, then the battery IS present. With the posted measurements, the battery is not detected. Check the wire from the battery pack that is linked to BATPRES#.

You can also take a piece of wire and short the BATPRES# line to ground and test again. This will force the charger IC to believe the battery is present.

[Pierro208]

Thanks if I ground BATPRES with the battery and the charger, currently 1.2V it will force the system to recognize the battery, I am stuck on all bios updates, impossible to do without the presence of the battery, I wonder if the problem does not come from the EC chip?

[mon2]

?? Did you try the suggestion? Does the unit power up anymore?

[Pierro208]

No, I'll try tomorrow and thank you.

[Pierro208]

I just tested by connecting BATPRES to ground, no more starting and I removed the ground wire and no more starting either on battery or charger ????de

[Polluxxiv]

Hello please can somone help me with the file or folder that I can use to erase bios?

[mon2]

Measure the voltage to ground on the charger IC for the following pins with only the adapter:

ACN
ACP
ACDET
REGN
ACDRV
VCC
BATPRES#

[Pierro208]

ACN 20V ACP. 13.25V
ACDET 1.1mV
REGN. 6.0V
ACDRV. 26V
VCC. 20V
BATPRES#. 1.6mV


Thanks

[mon2]

ACDET is too low. This voltage must be 2v4 or higher to detect the power adapter. Yet, acdrv is ok. Double check the ACDET measurement.

[Pierro208]

I was wrong, you are right, I have 2.7V

[mon2]

Can you double check your ACN and ACP voltages to ground? Each should be similar in measurement. If not, the charger IC will turn off the DCin mosfets.

Carefully measure directly at the charger IC pins but only if your meter probes are the fine tipped versions. Do not proceed if the meter probes are too thick due to potential shorting. Red probe to charger IC; black to ground.

[Pierro208]

I just checked, I have 20V on both, I have fine tip probes

[mon2]

These are good measurements for the points that have been measured.

Carefully measure the voltage to ground of each and every inductor on the board. Checking if there are voltages that are absent on the board. Do you have a boardview file for this model? Schematic will be a dream but rare to source for Asus models.

[Pierro208]

Regarding the boardview I have a model that is similar with I5, for me it is a Ryzen 5, regarding the measurements you can refer to message #6 and #12, #20 what is strange is that the PC starts if the battery is well charged and below 30% battery it does not start either on battery or charger, if anyone has an idea?

[mon2]

Is the power adapter the OEM model for this unit? Adapter could be under rated.

Do you have charging at all if booting with a pre-charged battery?

[Pierro208]

Yes, everything is original, charger, battery and there is no charge, battery precharged or not, there is plenty of information at the beginning of the post, do not hesitate to look at them

[mon2]

You have a 1v2 voltage on ACDET with only the battery (post #12). This is odd to me.

Locate the VCC pin on the charger IC and you should have a dual common cathode diode (SOT23 package = 3 pins) nearby. Using only the battery, measure the voltage to ground on each pin of this dual diode. Share the measurements. Suspecting that this dual diode may be leaking.

[Pierro208]

Je n’ai pas cette diode double, j’ai cherché sur la carte mère, je ne la trouve pas, était-il possible d’avoir un autre composant, j’ai testé les diodes autour de la puce et elles sont bonnes, une photo des BQ254800 de la carte mère.