PS3 FAT YLOD symptoms?

Hi everyone, i have a fat PS3 (CECHC04) that worked fine until a few months ago. I swap the HDD years ago with a 250GB one and i had no issues. I haven't used the console much lately, it has been shut down for a month or more, i don’t remember exactly.

I tried to turn it on a few days ago, the light turned green and the fan immediately started at maximum. After about 5 seconds, the light turned yellow for one second then i heard 3 beeps and the console shut down, while the light turned blinking red.

I followed ifixit’s YLOD guide, i heated the chips with the hot air gun, i replaced thermal pads and thermal paste, but the console has the same behavior. I also tried to turn on the console without the CR battery and without the HDD, but nothing helped. What could i check or do?

Thanks!