Any recommendations on where to get the chips outside of eBay?
This issue is common and has come up a lot. So much so it's already been well documented that computer booter and Ace Consoles have tried replacement of the RSX, GS and EE chip, this did not resolve the issue. Recently I have had a few consoles that refused to boot PS2 games from cold boot, but the moment the system reached over a certain temperature (the temperature varies depending on how severe the issue is) then the console will boot PS2 games.
REMEMBER, the main chips have already been replaced and this did not resolve the issue. In some cases the console won't boot the PS2 game no matter how hot it gets, but I believe it's the same issue just more severe.
So i did some experiments with the consoles I had recently to see if I could get to the bottom of what's going on. I did notice that when people installed custom firmware and webman mod the issue started to present itself. This is because webman mod from default will aim to keep the console under 68 degrees. This means the system can't reach the desired heat to run PS2 games. So on lots of forums you will hear people saying that after a custom firmware installation they can no longer get PS2 games to boot.
So my first thought was to see if replacement of the NEC tokins would work. However I then got a reply from someone saying they had already tried this and it didn't work. So my next thought was to see if baking the console at 120 degrees for 3 hours on a PS3 motherboard bracket would help. I believed if this works then it's likely to be an RSX issue. But then I remembered that the RSX had been changed on a console with the same issue, I baked it anyway to remove moisture and to help straighten out any warping of the motherboard.
Well to my surprise it booted from cold, it would only do this before if the console was running hot. If it's not the RSX, EE or GS chip then what's happened? Has a failing capacitor been revived with heat, why was it now working? I then obtained 3 more consoles with the same issue, all of them now work from cold boot, what's going on??
So my theory is the motherboard is slightly wrapped and this prevents some traces communicating between some components on the motherboard. When the console runs hot the motherboard expands and contracts which allows the trace to communicate as it should. By slow baking the motherboard this helps to irradiate the warping thus resolving the issue. This is only theory but currently all I know is that by resting the motherboard on a PS3 bracket (not screwed down just resting on it) and allowing a 3 hour bake at 120 degrees (turn off oven and don't remove until it's cold, that's normally another 2 hours) then after this process the console boots PS2 games from cold boot again.
I currently have not had a console that refuses to boot no matter what the temperature is, but when I do get one I will try baking it to see if the issue is resolvable using this method.
Link below of me trying out this method for the first time.