Hi everyone,

hope you are doing good ? Looking for a board view of the MBX-261 motherboard from a Sony Vaio SVS series, i have an issue with a board and i can't find easily where are going the tracks to understand why i don't have 3.3V on my bios. Thanks in advance.

Mmmh, i think i was speaking too fast. I am under the impression that the top right corner of this VT370F is the VCC, and therefore, i should get 3.3V there compared to the working board and i have nothing. So back to square 1, i don't know where the 3.3V of the bios leg should come from, i have no way to trace the track. How do you proceed in such condition ?

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I checked the bios chip, no power on leg 8, and i compared with the good board to make sure i wasn't mistaking. I traced where the 3.3 was coming from, and guess what, from this VT370F power regulator. I have 3.3V on top right corner resistance on the good board, not on the bad one.
Once i receive new one, i will exchange and let you know.

When i plug the battery in, i have pretty much the same value on both BQ chips, so i think i am good here probably.

I unfortunately have no schematic for this board, i have been looking all around the web with no success.
The charger IC is the BQ24725. Both mosfets looks good, i see 19V coming through and i don't see an issue with it.
However, i am wondering if i don't have an issue with the BQ chip, because on the screenshots, where you see 1.2V at the coil next to it, on a working board i have 2.4V. And this voltage directly comes from BQ. I ordered few of them tro try it out, i don't want to mess with my working board. I also ordered few VT370F in case of, but i am really wondering if this little...

Thanks for the help.
Yes i checked, i get the 3.3V on the power button itself, pressing it cause the voltage to go to 0V and then back to 3.3V. On the other end, i checked all the fuses of the board, all looks good, when no battery is present, the board eats 4mA on the DC-in and no difference if i press the button, when the battery is in, it starts to a steady 230mA and then jump to 500mA, again no difference if i press the power button on the current.

Hi everyone, newcomer in this forum, i watched tons of video from Sorin, i like the way i calmly explain things, i did quite some console repair, i am not that bad at micro-soldering, but troubleshooting where the issue is, is definitely where i still have progress to make. Usually i was able to fix the console because the failure was obvious, or because i was able to find someone with similar measures on the board and was pinpointing what to replace that way.
Nevertheless, let's say, i don't come as a total beginner.
I have this old laptop, which suit perfectly my needs, with the...