Demonic Audio from SCPH 1000 PS1

I have this Japanese PS1 that has a weird issue.
It's making some very creepy sounds on start up.
I can't tell you what it sounds like when the game starts because the laser needs to be fixed.
What could be the problem?

I've uploaded a video for you to hear.




UPDATE:

Here's the video with the game play. Sorry it took a while.

Feels like I'm playing NES

 

DAC could be on the fritz? But wow, that is odd. Lucky you have an SCPH-100X, as you might be able get a game to work by adjusting the "BIAS" and "GAIN" pots on the motherboard. Pretty sure stock voltage for both is 1.7V, but there are many guides out there on how to do this. It is a lot safer than laser intensity and in most cases, can fix a laser.

Link to guide; http://nuangel.net/pcdownloads/PlayStation_Laser_Repair.pdf

I suggest trying .05V increments upwards. Good luck!

 

Many thanks for your input. I have followed this guide a few times in the past and can confirm that it does fix the laser problem in these models. Sometimes without any pot adjustments as well.

Japanese SCPH-1000 isn't that difficult to find where I come from and they are quite cheap. However almost all have worn out lasers and a few here and there with that same audio problem. I now have about 4 with that same issue

Any suggestions on how this can be fixed?

EDIT: I'll work on hooking up a working laser to see how it sounds during game play.

 

Ah, cool. Best bet is just to test a game. If it makes the same odd noises, it is the DAC or another sound component. If it works fine, its the BIOS, I'd assume.

 

If the DAC is the issue, then do a digital audio mod. Should you not have an audio reciever with a TOSLINK or digital coaxial input, you can use a digital TOSLINK to analog RCA audio converter.

 

dude thats awesome

 

Any update? I wanna see if it is like that in game! Lol

 

It actually sounds pretty cool lol.

 

The problem is not anything with the audio circuitry. It's a digital issue. Wrong parameters in the SPU.
It could be dried solder joints with intermittent contact or the traces are rotting.

 

Sorry it took a while to get back. Here's the video with the game play. Feels like I am playing an 8bit game

""



Here's a couple of the board where the SPU is back and front. As you can see looks clean. Don't know what might be happening underneath though.

Any suggestions?

 

I don't see see any problems.
Since it could be a lot of things, including bad ICs, be prepared that you may not be able to fix it ;p

 

That's not what I wanted to hear

Where can I start to attempt to fix it? Not very experienced with this stuff.

 

Do you have a hot air station or something that blows *not too hot* air?
You can hook up the system, heat up an area and see if the glitches change.
This helps you isolate the area of the fault.
(Cold works as well, if you have something available.)
If you use heat, make sure you don't overheat the pcb. It will bend and your components will come loose.

I've used a hot air station at 200C blowing on ICs in a faulty SNES. When heating up the CPU, the glitches went away > faulty CPU.

 

I have blow dryer that gets pretty damn hot
I'll give it a shot and report back. Got nothing to lose.

 

I was hoping you didn't say that

 

Couldn't get it to work unfortunately

I am assuming the chip itself is probably fried. I am seeing more and more consoles with the same issue. Seems to happen with the SCPH 1000 models only.

 

You could look around, find a console mod guy and get him to take a look.
Just don't throw it away please. It is kind of rare ;p

 

There aren't many console mod guys where I am from I am afraid.
I won't throw it away. Don't worry. I'll keep it for spare parts.

 

Outside of Japan maybe, but its not rare in general.

 

cxd2922q is the same chip as cxd2925q that uses in pu-7, pu18 (maybe even in pu-20). At least my scph-1000 had sound problem. It was silent. Friend said to swap this chip and it works.