PSX questions (PSUs, audio noise, spdif modding)

[ZellSF]

So I have a US PSX (a 1000) but it's terribly noisy on the audio output. Not sure what to do about it. I'm thinking that it might be caused by the stepdown converter and / or power supply.

Not sure how likely that is, but getting a native power supply might be a good idea anyway, but how interchangeable are PSX PSUs?

Also if that isn't helpful, I'm wondering if there are anyone who can do SPDIF mods for PSXs?

[ApolloBoy]

Not sure how likely that is, but getting a native power supply might be a good idea anyway, but how interchangeable are PSX PSUs?

Should be just a matter of swapping out the PSU boards. I don't remember the SCPH-1001 having noisy audio so it could very well be your stepdown converter.

[ZellSF]

Are all PSX model PSU boards interchangeable though? If I get a SCPH-500x will it use the same PSU as a SCPH-100x?

[ApolloBoy]

I think you'd have to use one from an SCPH-1002 as I don't think later model PSUs will work.

[ZellSF]

Thanks. Audio problems were power supply related, replaced it with a proper PAL PSU and everything sounds very clean. Extremely clean actually, I was expecting to get rid of some of the noise, but not all of it.

[Xyga]

Had to resolder the first two (big) contact points of mine recently, they were loose (20 years or plugging/unplugging lol).

Kept rebooting the machine and making a 'bzzzzt bzzzzt' noise. Now all perfect again, took 5 minutes.

The optical block however is showing its age, cleaning the lens and adding a drop of fresh grease to the mechanism helps for a while but barely.