Good mod for you to try for the PS3 Yellow Light of Death:
Carefully remove the low-quality original thermal paste and try a reputable brand like Arctic Silver. The thickness does not matter too much as long as the paste covers the entire contact area and makes good thermal contact.
You could also try changing the paste on the Emotion Chip.
There are many other things which cause the YLOD, so this suggestion may not help. It seems to work about 1 time in 4 from what I hear.
Best wishes.