PS2 High Pitch Sound Coming out on the TV Speakers

[finalman]

As the topic says I have a high pitch sound coming out on the TV speakers.

Details:

• Not always there but it is about half of the time. Can be there one boot and gone the next if you are rebooting within seconds of the last boot.
• It shows up when the PS2 browser menu is loading and goes away after the game\dvd\hombrew app boots.

This PS2 is a SCPH-30002 v3 with GH-007 motherboard.

What it isn't: (As I've already checked)

• TV
• AV lead
• Power supply
• Syscon daughter-board (GD-013)
• Disc drive pcb (GM-043)
• BIOS
• DAC (IC517)

So got to be the motherboard (GH-007) thing is though you would think electrolytic caps near the AV port but I also tried it using Digital optical cable and a sound system and the sound is still there. So it must be being generated either at or before the PS2 sound chip (SPU2 / IC504) because the digital optical signal circuit comes straight from that chip on different output pins to the AV port circuit which goes through a digital to analogue converter chip before going to the AV port.

UPDATE: Boot ROM BIOS dump verifies the same as my working similar model PS2 so probably not bios corruption.

UPDATE: Also removed the DAC (digital to analogue converter) IC (IC517) from the motherboard and the sound is still present through the optical audio port.

UPDATE: Was the sound chip. I removed it with a hot air station and installed one from another faulty PS2 motherboard and the issue went away. I installed the suspected faulty sound chip back onto the other faulty PS2 motherboard, the one the donor came from and it now has the same sound issue.

 

[arcadekidflo]

I think it's just the AV cable..

 

[finalman]

UPDATE: Was the sound chip. I removed it with a hot air station and installed one from another faulty PS2 motherboard and the issue went away. I installed the suspected faulty sound chip back onto the other faulty PS2 motherboard, the one the donor came from and it now has the same sound issue.

 

[finalman]

Since switching the faulty SPU chip to the other motherboard i've had a bit of a play around with afew games and homebrew and discovered.

Homebrew apps with no sound like OPL and launchELF the high pitch sound disappears.

Games Without Issue:
Jax and Daxter

Games With Issue:
Bombastic
RE Code Veronica
Silent Hill 2
Silent Hill 3

Rebooting the PS2 to the browser menu using the soft reboot button combo the sound issue returns.

Anyone in Australia got a faulty early model PS2 and want to send me just the CXD2942AR sound chip. If so PM me so we can discuss postage.