Hiya, from my experience when i replaced the 8 x old NECs, with 8 x "new" NECs, at first i wanted to test with just half to see, and i still had YLOD, it wasn't until i had installed all 8 x "new" NECs that the PS3 worked again.
When i measured the "new" NECs they were like 1400uF to 1600uF (approx)... so really each processor is getting 6000uF. When i did my tests with the Tantalums + MLCCs (as can be seen in my post above), i tired 1st with only (approx) 4800uF on each processor and i had YLOD, only when i installed 7000uF+ (16 x 470uF) per processor, did the PS3 work again, anything less wouldn't work at all, or would work only 30% of the time, the more capacitors = the more it worked.
Tantalum capacitors genereally have a 10 - 20% tolerance, but if they come from China, like some i played around with, oh man - some 470uFs (20%) were actually reading at 600 - 700uF+ !! So unless the capacitors are of high quality and sourced from authentic places, then aiming for 4800uF per processor won't be enough with cheap caps. So aim for 6000 - 7000uF per processor and that should help even with cheap chinese capacitors.
But... even with quality capacitors, i would still aim for 6000uF per processor.
So
@aminiani, if you replace only 2 NECs with Tantalums, and the other 2 NECs that you leave are the faulty ones, then you will likely only have approx' 3760uF (8 x 470uF) in total per processor, that's not enough, it's like another 3500uF too short to work, as mentioned above.
Also, if the internal bridging wire of the NECs you left on the board is faulty, then this too will result in YLOD with your present attempt / set-up. Because potentially no current is getting across to the processors without correct bridge wires. But then adding a bridge wire with a full Tantalum replacement can be problematic. Please see my photos above from my latest post, and how the capacitors are
only on the bridge wire, otherwise adding a "raw" bridge wire in parallel to the tantalum capacitors can potentially cause some, or most of the current to get re-routed, and not get filtered properly by the capacitors, before then arriving at the processors.
So in short, total capacitance of 6000uF - 7000uF+ per processor, lower end if using high quality capacitors, and higher end if using cheap chinese capacitors. If a person ends up replacing all the NECs with Tantalums, then they are forced to consider the bridging wire(s), and how they will go about installing them correctly to not get YLOD.
...take 2, so i re-did the Tantalum + MLCCs combination (just on the bridge wire only), this time i doubled checked the (+) and (-) lol, so far the PS3 is running great!
Again thanks so much for spotting my silly mistake on my last build. I'm gonna aim to test this latest working set up and update you guys soon all being well, just need to run some intensive games. Unfortunately i don't have an o-scope to measure anything, i wish i did though, maybe soon.
