Lenovo Legion 5 15IMH05H (Mobo NM-C911 Rev: 1.0)

[eastcoastcomputing]

Hello there, I have this motherboard and I think a mosfet (PQ101) is mis-behaving preventing the board to start up. I would like to try and replace it but I struggle to identify if. The ref on the schematics I got from another chat don't seem to match and the ref on it doesn't seem to match either the way the manufacturer usually puts refs on their chips. Can anyone help, please?

[mon2]

Hi. You can study the type and spec of this mosfet from the ref designs supplied by the charger IC (BQ24780S) company = Texas Instruments (aka former Benchmarq group who designed the BQ charger IC). This is a jellybean N-channel mosfet @ 30V rating. You can find them on almost any motherboard. Just be sure the mosfet is a N-channel type and watch the pin # 1 location of each before replacing.

[eastcoastcomputing]

Oh! So, Do you mean I can replace it with an AON7506 or similar?

[mon2]

Yes but higher the drain current the cooler the part will run. You can test with this part. The better parts are available from Texas Instruments and will have lower Rds resistance so they can support higher peak currents. In summary, will this logic board take 12A to operate?? No, so safe to use.

[eastcoastcomputing]

Thank you for your time. I'm grateful for your answers. Sorry if I keep asking, I'm not trying to waste your time, I'm just trying to get the right stuff... Would you say this TEXAS INSTRUMENTS CSD17556 30-V N-Channel NexFET Power MOSFET

would be more suited?

[mon2]

Yes, that looks like a great choice. Note the very low Rds value of 1,2 milli-ohms? This allows for the very high peak current support. Lower the resistance, the better. Often you can sign up with the Texas Instruments website for free samples which are usually filled by Digikey or Mouser with free shipping. Make up a company engineering name if needed.

[eastcoastcomputing]

That's great advice, thank you very much!