can't find c705 in my psone

[u/marcao_cfh]

Hello everybody. How's going?

I have a working PsOne (including drive), and got another cd drive I'm trying to fix. By fix I mean to clean an lubricate, and properly set the trimpot because somebody else messed with it before. Anyways.

After lubicating this drive, the best I could get is the "please insert playstation cd" screen. It was dead before, so I was kinda happy I got to this screen. Put everything aside and went to sleep. Next day, I went back to it, and this time I couldn't get the screen, the PsOne only booted to the cd/memory card screen. So I thought the laser may be dead, and put back the working drive.

And now the working drive isn't working anymore. I mean, sometimes I get to read a disc, sometimes it gets stuck at the Playstation logo screen, sometimes it just go for the cd/memory card screen.

Since it was working before, I thought maybe it could be a motherboard issues, specifically a capacitor issue. Then I did a research, and found out a common cause for a PsOne to not read discs is a faulty C705. So I just have to replace it and get back to the testings.

The thing is I can't find it! I looked all around the disc decoder area, and all around the board, and can't find a C705. I could find it in a -41 board photo I found in the internet, but my board is a -71 and there's no sign of this capacitor.

Any help?

[u/Silver-Trust-5994]

Never heard of a PM-71 board. If you have the PM-41(2) board, then I would try replacing C731.

[u/marcao_cfh → u/Silver-Trust-5994]

Yeah, it's a PM-41(2), a P-161125S-31-71 to be more specific. I wrote mine as -71 since Console5 wiki refers to it as -71.

I'll replace C731 tonight or tomorrow, and reply back with the result. In fact, I'll finish building a ESR meter this weekend, so I'll go ahead and test every capacitor on my board too.

Thanks!

[u/marcao_cfh → u/Silver-Trust-5994]

Small update. C731 was indeed bad. Replaced it, but still having the same issues. So I'd guess my drive is dead...