[NEED TO FIX] : Need help for diagnose a PU-8 Mainboard

[Xrider]

Hello, I am looking for information.
I have a PU-8 motherboard which is sick.

Here is the symptom: all the CDs that the PS1 turned on display on startup :

Capture d’écran 2021-06-12 à 12.57.30.png

and then you can hear the CD player making noises identical to a CD player problem and it's freezing.

Freeze comes at the start of the game (a few seconds after the Playstation logo)

The console works fine in PSIO mode, so the CPU + work Memory system works fine.

The installation of the PSIO board is not the problem (problem before PSIO board installed)

So I need some idea on this problem, it will save me time and above all it will avoid transplanting all the chips to find the problem.

thank you in advance for your help

*Here is my first conclusion:
The problem comes from the CDROM control system :
- Mechacon?
- CXD2510Q?
- CXD1815Q?
- CXD2925Q?
- Memory of CXD2925Q?

Thanks

[~PSXLoVeR95~]

Broken CD-XA decoder. License.dat didn't read correctly by this one. Replace CXD1815 with another.

[Xrider]

Broken CD-XA encoder. License.dat didn't read correctly by this one. Replace CXD1815 with another.

Thanks for your confirmation,
i will swap it ASAP with another CXD1815.
Do you know of i can swap it with CXD1199 from PU-7 (SCPH-1000) ?

[~PSXLoVeR95~]

I think you can...

CXD1199Q and CXD1815Q have the same package and same number of pin (100 QFP)

[Xrider]

I think you can...

CXD1199Q and CXD1815Q have the same package and same number of pin (100 QFP)

I confirm, and it work properly ! Thanks

[~PSXLoVeR95~]

You're welcome !