I have discovered that if you piggyback some tantalum capacitors onto the top side of the board (assuming yours is backwards compatible) that this prevents unexpected shutdowns. I tested this with several consoles and all would shut down when playing TLOU after a few hours of game play.
Now it plays for over 6 hours with no shutdowns, and this was the case with 3 consoles. I had a failure (4th one i did) on one I suspected had a recovered GPU and when I piggyback the caps it went YLOD. Not sure why this is however I have had this happen in the past when I have heated the GPU to get a boot then tried to swap the NEC Caps and this again resulted in YLOD. So it seems if you have heated up the chips, old style reflow method, and you have recovered a failed GPU the tantalum caps result in failure.
The 3 it was successful on all had GLOD issues and this was recovered with pressure. I have had no failures with this pressure mod and the addition of the tantalum caps keeps the system stable.
In the link below you will see I add 2 to the CPU and 1 to the RSX. This prevents unexpected shutdowns and has worked on all three consoles, just don't do it if you suspect the GPU has been recovered.
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