YLOD- tryed everything!

Hi got a ps3 last week never even played it but turned it on the fans did not sound the best so i opened it up and gave it a clean.. Put it back togeter then bam ylod

Tried about 5 reflows with flux and without even tried the oven.. Done the fan test so dos that mean its not the psu

I flashed it that day and was on multiman about to play the last of us then turned it off to fix the fans

Any ideas on what to do or is it just paperweight now

Please anyone help me