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ASUS 15.6" F550 Laptop. Similar model numbers F550C, F550CA, F550CC, F550E, F550EA, F550L, F550LA, F550LB, F550LC, F550V, F550VB, and F550VC. It was released in 2017.

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Water damage - no 3.3V anywhere

Hello guys! I will come straight to the point and paste this album of photos. https://imgur.com/a/JJqOcaQ

This is a mainboard from Asus X55VD Rev 2.1. It suffered water damage and I think the power controller? RT8206L might be faulty. Also the components around it, but I dont know if this is the case. Also the bios chip (i think it is the MX25L6445E) near that ITE IT8517E does not have the 3V.

The 19V i can find on some spots, especially near the power connector, along the bottom to the right. See first picture for that. I cant find any voltage anywere else.

The power button of the notebook seems to work since my DMM beeps when I press the button with the probes on its pins. Not even there are 3V. How exactly should I proceed with my search?

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Hi @mike8 ,

I don’t know the answer but here’s a link to a webpage that has a couple of links to the schematics for an Asus X55VD Rev 2.2.

Not exactly the same revision version as yours but maybe close enough to be of some help in tracing the problem.

The only caveat is that you have to register with the website to download the schematic.

I haven’t tried this to check how good the schematic is but it still may be worth a try.

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