I have pulled out my hair over this one for so long, couldn`t find the answer.
Practically i have good experience with disassembling laptops, soldering, changing parts and so on. But this one is over my head!
So, a friend of mine gave me his AMILO L7310GW notebook with a power problem. Laptop powers on, you can hear the fan spinning for 5 seconds and then powers off again. Than again, powers on (by itself), 5 seconds spinning (no post no nothing) and powers off. Infinite loop until i plug it out of the power adapter. Since my friend used his laptop (when it was still working) on a lan cable, so, i thought that the integrated lan card may be blown out and creating a short circuit on the motherboard. I disassembled it, soldered out the lan chip - no change at all. Soldered out the bios chip, put it on a programmer, put on fresh new (last) bios - still no change. Tried swapping ram, different power adapter (same voltage), hard drive, CPU, everything i could think of. Also done BGA reballing on the VIA video chip, and VIA chipset.
So after a month and so - nothing seems to be changing the picture. Infinite power on/off loop. I`m pretty sure that this is major problem, but i had to try here :)
Any ideas how to make it work?