ASUS GL504G no power

[coconoce]

Hello, I acquired a not working ASUS ROG SCAR GL504G (i7 8750H-RTX 2070 8gb GL504GW rev 4.1) to try to try to repair it and learn something new.

The laptop didn't want to turn on, while testing removing components it turned on for a couple of seconds but after that no more signs of life. I cleaned and inspected the board and found some tiny solder spheres rolling around, maybe signs that someone already tried to work on it. The other thing i found was a pair of stripped solder joints where there should have been what from the images I found online I think is a fuse, I am now trying to find its specifics.
I know the starting point is not one of the best but I still would like to give it a try

To troubleshoot I started following the main power rali, the 20V line seems fine around the board but the 3.3V and 5V coils i checked are completely dead. I marked down on the picture the voltages measured from what I thought to be the key points but i am now at an empasse

how can I go on to try and troubleshoots the missing lines?

Thanks

[mcplslg123]

The ripped solder joint you are referring to seems like a capacitor.

Link the schematic/boardview

Start by measuring resistance to GND on all coils(black probe to GND and red probe on each coil)

For measuring resistance to GND on cpu/gpu/pch coil, set the meter to 200 ohms scale and for others you can set it to 20K.

Post the measurements here.

[coconoce]

thanks for the reply, I'm looking around for the schematic of this particular revision, for now i found only older or newer models

here's the values, how come the reading takes a while? is if because of the capacitors in the circuit?



cpu's coils read were all between 2 and 0.2 ohm

[mcplslg123]

2 ohms on cpu coil is fine but specify which coil shows 0.2 ohms as this low resistance is a cause of concern.

[coconoce]

yesterday I must have fumbled while taking the measurements, today I took the time to take the measurements and the result is that all the cpu's coils read 2ohm while all the gpu's coils look shorted.

Next step would be to remove all the coils to locate the short right?

[piernov]

https://www.badcaps.net/forum/troubl...61#post1459061

2.2. Don't suspect that something is shorted with no reason
Shorted components are not the only failure mode of a laptop. Additionally, some places will measure low resistance to ground under normal operation. In general, high power low voltage (<2V) power rails will measure less than a few hundred ohms to ground. CPU VCore will measure a few ohms only. GPU VCore with newer NVidia GPU can even measure less than 1 ohm. It's normal. If you suspect a short to ground, always report your exact resistance to ground measurements.

[coconoce]

https://www.badcaps.net/forum/troubl...61#post1459061

you're right sorry, in the hurry of the moment I didn't consider what i read. I'm in the first steps of learning