CAP10 LA-E321P Precision 7720

[jonyje]

I hope someone can help me with troubleshooting my motherboard for Dell Precision 7720 laptop. Recently I spilled water on my laptop and, I'm trying to troubleshoot motherboard. As soon as I press power button fan comes on for few seconds and power supply shuts off. I removed motherboard and notice some damages around CD3301. I replaced it with new one but problem is still there. I tried to trace power to it and I noticed that I'm not getting any voltage on the PU105. I would like to know if this is normal. If not what is the next component to check? I'm using LA-C541P schematic. I was not able to find LA-E321P.

Thank You

[mon2]

Re: CAP10 LA-E321P Precision 7720

E321P schematic is available but we are using a paid service for this access.

See attached.

[jonyje]

Re: CAP10 LA-E321P Precision 7720

E321P schematic is available but we are using a paid service for this access.

See attached.

Thanks for the screenshots. Any idea where the +3.3V_ALW is coming from and should I be able to see it on PU105 pin 5 while charger is plugged?

[computerden]

Re: CAP10 LA-E321P Precision 7720

E321P schematic is available but we are using a paid service for this access.

See attached.

apologies for reviving an old thread but where can I buy those schematics? i cant read them properly with it being cut up

[mon2]

Re: CAP10 LA-E321P Precision 7720

It is from a paid sub that links LA-E311P as the same or similar - you can download the same schematic here:

https://www.badcaps.net/forum/showth...ighlight=E311p

[khaahk]

Re: CAP10 LA-E321P Precision 7720

Attached