ACER E5 551 - ANOTHER DODGY MOTHERBOARD

This week I have an old Acer motherboard that is reported to be faulty. Let's see if we can get it working and maybe even learn something in the process.
Please post comments and suggestions below.

[@transformateur9969]

Thank you so much ! You speak well, you explain well in calm and simplicity! I love your videos and if it were possible, I would take a full course with you! Good continuity ! 💪

[@celulartj]

Excellent learning channel

[@danarepouille1381]

As you saw, when these 3V/5V power supplies heat up, it is usually because something on the other side of the output inductor is drawing too much current. I am amazed at how resilient those power supplies are. Sadly, we find that either the PCH or the EC chip is shorted internally to ground in these cases. Almost as if they were designed to fail outside the warranty period.

[@toannguyen-hf5xk]

Thanks teacher

[@nikolaskallianiotis8622]

I had recently a board with the 3VLDO (3VLP) controller exploded. This is a very bad situation because this power rail goes directly to EC and PCH (or whatever it's called on an AMD based system). In my case both PCH and EC were shorted. I injected 1V in the 3.3 coil with 2A draw and I couldn't feel to the touch something heated to much. I then dropped a few drops of IPA to the PCH crystal and I noticed that when I applied the voltage the IPA moved slightly away from one of the corners. That was the definite proof that PCH was dead.

[@mathreparoticocr]

Step the Amp up to 1 then 1.5.. make sure its not a cpu or gpu rails