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

[Pierro208]

If someone could send me a photo of the area to compare?

[mon2]

See attached.

Believe the circled 2 parts are the dual diode on your board. Often, designers will use a 3 pin SOT-23 packaged dual diode but this build is based on 2 x single diodes for the same purpose.

Remove all power. Meter in DIODE mode.

Touch your probes together and the meter should tone beep.

Place the red meter probe on the back (top in diagram) side of one diode. Black meter probe on the bottom side (cathode). You should have a voltage measurement. Note this value.

Reverse the meter probes and the meter should show 'OL' - blocking in the reverse mode.

Repeat for the 2nd diode. Post all measurements. We are checking if one of these diodes are leaking.

Next, switch to resistance mode. Measure the resistance across the 100 marked resistor which should be ~10 ohms. Confirm it. Again, with no power to the board / no battery either.

[Pierro208]

In beep mode, on both sides I have no reading, there is always OL written on the multimeter, the resistance measures 10 ohms

[mon2]

Switch to the lowest resistance mode. Measure the resistance from the resistor marked '100' to these parts. Do you read ~0 ohms? The other side of this same 10R ohm resistor should be the Vcc pin # 28.

Confirm this detail. Fairly sure these 2 parts are the diode and at least one must be working since the unit is able to power up.

No power to the board during resistance or diode mode testing.

[Pierro208]

In diode mode, I have a reading of 0.635v and OL for the other side, the diodes are in the same direction

[Pierro208]

same reading for the 2 diodes

[Pierro208]

I confirm, it corresponds to number 28, I have a reading of 0.60 ohms, when I touch my probes I have a reading of 0.60 ohms

[mon2]

Ok. The diodes appear to be ok. Confirm another way to be sure.

Attach only a pre-charged battery (no power adapter). According to the ref design from TI which most likely was followed by Asus engineers, power up.

The battery voltage should appear on the cathode (top side) of one of the diodes. Confirm there is NO voltage on the backside of the other diode. That is, when one diode is conducting, the other should be blocking. You should not have a voltage present at the adapter input side (review the TI schematic for guidance).

When you attach only the battery - carefully measure the ACDET voltage to ground again.

[Pierro208]

It's not exactly the same pattern but it looks very similar.

[Pierro208]

Cest pas exactement le meme schema mais ca ressemble beaucoup

[Pierro208]

Is it normal that the 2 diodes are with the cathode in the same direction? Concerning the reading only with the battery connected I have a reading on the 2 diodes anode and cathode sides. The one on the left anode (at the top) 11v and cathode 10.8v, the one on the right anode (at the top) 8.6V and cathode 10.8V. ACDET = 1.165V

[mon2]

Highlight the other side of pr3008. Do the 2 diodes light up in the bv drawing? With only the battery attached, only one of these diodes should have a voltage at the anode side. ACDET is usually fed by the adapter voltage only. Will review once at the office.

[Pierro208]

you probably mean pq3008, I have no voltage with the battery, I have 8V arriving on PR3043 and PR 3045 but practically nothing at the output

[khaahk]

Seems you have a missing component there, if i am not mistaken n-channel mosfet (sot23)

If someone could send me a photo of the area to compare?

[Pierro208]

Thank you all very much, you are a great help, Khaak I noticed from the beginning that I had a 10k resistor soldered on the power supply see message #1, could you send me a front and back photo of your motherboard please?

[khaahk]

Well it is not mine. Telegram link:
https://t.me/BoardsScanRepo/266/4081

[Pierro208]

Many thanks for this motherboard encyclopedia, I can't find the exact model with the references, do you know its reference?

[Pierro208]

I just got it, so cool