Acer Nitro 5 3valwp short 1ohm

[mcplslg123]

Re: Acer Nitro 5 3valwp short 1ohm

You didnt shared the final resistance to GND on +3VALW line as well as +1.05V rail before soldering the new PCH. You only said now all re good. If PCH gets shorted on triggering the mb,there is still a short on the mb.

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

I measured ~6kohm on 3valwp (without LAN and Sound IC)

I don't remember the resistance value on the 1.05V rail (kohm range), I can only say that these voltages appeared when switched on, nothing else (without PCH):
5VALW (5.08V), 3VALW (3.37V), 1.05VALW (1.07V) and 1.8VALW (1.85V)

After a few seconds, they turned off and only 5VALW remained on. When switched on again (keyboard connector 1-2 pins), they appeared again.

The resistance of the new PCH at 1.05V is 50 ohms after soldering

Thank you Sir!

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

I injected 0.8v to the 3.3v and 1.05v voltages and also to the 1.8v. The heat is generated in the same place in all three cases. Then pch removal again ☹️

I did videos and uploaded to youtube :
https://youtu.be/Zwd2bqZDxmQ
https://youtu.be/rg7CWiP50ao

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

I removed the pch.
I measured the resistance:
- 3valw: 19,4kohm
- 3v ldo: 30kohm
- 5valw: 66,5kohm
- 1,05v: 34,4kohm
- 1,8v: 30kohm
- cpu vcore: 2ohm. i7 9750h
- cpu pla1: 13,5ohm
- cpu plg1: 4,5ohm
- ram 1,2v: 200ohm
- 2,5v pj2502: 2,8kohm
- plw1: 113ohm
- gpu core 0,8ohm gtx1050
- plh1: 43ohm

These values are without pch, sound ic and lan ic

Thank you!

[Dan115]

Re: Acer Nitro 5 3valwp short 1ohm

Hi Thomas,
Where are you with your laptop problems now? Did you get to some results since last post? Thanks

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

Hi Thomas,
Where are you with your laptop problems now? Did you get to some results since last post? Thanks

Hi Dan
I haven't looked since then. I can't find any fault. I will try to load the 1.05 and 3.3v rails without pch.

[Dan115]

Re: Acer Nitro 5 3valwp short 1ohm

I have +3VALW , +3VALWP all shorted. PU301 is good but does not start up if PJ302 is cut off. PJ501 for +5VALW good. My PCH is done. How did you manage to solder the new one and not damage it? I have only hot air gun.

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

I have +3VALW , +3VALWP all shorted. PU301 is good but does not start up if PJ302 is cut off. PJ501 for +5VALW good. My PCH is done. How did you manage to solder the new one and not damage it? I have only hot air gun.

I removed it with hot air. The new with reball device, not me.

[Dan115]

Re: Acer Nitro 5 3valwp short 1ohm

What do you mean with " the new with reball device " - is it BGA resolder station? Could you share the exact seller you bought the chip from( AliExpress I presume )? Thanks

[Thomas8607]

Re: Acer Nitro 5 3valwp short 1ohm

I have +3VALW , +3VALWP all shorted. PU301 is good but does not start up if PJ302 is cut off. PJ501 for +5VALW good. My PCH is done. How did you manage to solder the new one and not damage it? I have only hot air gun.

What do you mean with " the new with reball device " - is it BGA resolder station? Could you share the exact seller you bought the chip from( AliExpress I presume )? Thanks

Yes, with bga reball station.
I bought from aliexpress, https://a.aliexpress.com/_mONLHnY