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

Post a topic about yourself to let others know your skills, hobbies, etc.
Post Reply
User avatar
Xrider
Verified
Curious PSXDEV User
Curious PSXDEV User
Posts: 31
Joined: Jan 04, 2019
I am a: Hardware Dev
PlayStation Model: SCPH-5502
Contact:

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

Post by Xrider » June 12th, 2021, 9:57 pm

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
You do not have the required permissions to view the files attached to this post.

User avatar
~PSXLoVeR95~
Verified
Active PSXDEV User
Active PSXDEV User
Posts: 73
Joined: Sep 18, 2016
I am a: Huge lover of PS1

Post by ~PSXLoVeR95~ » July 19th, 2021, 4:20 am

Broken CD-XA decoder. License.dat didn't read correctly by this one. Replace CXD1815 with another.
Last edited by ~PSXLoVeR95~ on November 24th, 2023, 12:18 pm, edited 1 time in total.
~ My PS Collection ~
4x SCPH-1000
2x SCPH-1001
7x SCPH-1002
1x SCPH-3000
1x SCPH-3500
1x SCPH-5000
1x SCPH-5501
1x SCPH-5502
2x SCPH-7000
2x SCPH-7002
1x SCPH-7500
1x SCPH-7501
2x SCPH-9000
1x SCPH-9002
3x SCPH-102
>>IT'S A SONY

User avatar
Xrider
Verified
Curious PSXDEV User
Curious PSXDEV User
Posts: 31
Joined: Jan 04, 2019
I am a: Hardware Dev
PlayStation Model: SCPH-5502
Contact:

Post by Xrider » October 20th, 2021, 4:28 am

~PSXLoVeR95~ wrote: July 19th, 2021, 4:20 am 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) ?

User avatar
~PSXLoVeR95~
Verified
Active PSXDEV User
Active PSXDEV User
Posts: 73
Joined: Sep 18, 2016
I am a: Huge lover of PS1

Post by ~PSXLoVeR95~ » November 1st, 2021, 5:26 am

I think you can...

CXD1199Q and CXD1815Q have the same package and same number of pin (100 QFP)
~ My PS Collection ~
4x SCPH-1000
2x SCPH-1001
7x SCPH-1002
1x SCPH-3000
1x SCPH-3500
1x SCPH-5000
1x SCPH-5501
1x SCPH-5502
2x SCPH-7000
2x SCPH-7002
1x SCPH-7500
1x SCPH-7501
2x SCPH-9000
1x SCPH-9002
3x SCPH-102
>>IT'S A SONY

User avatar
Xrider
Verified
Curious PSXDEV User
Curious PSXDEV User
Posts: 31
Joined: Jan 04, 2019
I am a: Hardware Dev
PlayStation Model: SCPH-5502
Contact:

Post by Xrider » November 8th, 2021, 12:27 am

~PSXLoVeR95~ wrote: November 1st, 2021, 5:26 am 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

User avatar
~PSXLoVeR95~
Verified
Active PSXDEV User
Active PSXDEV User
Posts: 73
Joined: Sep 18, 2016
I am a: Huge lover of PS1

Post by ~PSXLoVeR95~ » November 9th, 2021, 12:32 am

You're welcome ;) !
~ My PS Collection ~
4x SCPH-1000
2x SCPH-1001
7x SCPH-1002
1x SCPH-3000
1x SCPH-3500
1x SCPH-5000
1x SCPH-5501
1x SCPH-5502
2x SCPH-7000
2x SCPH-7002
1x SCPH-7500
1x SCPH-7501
2x SCPH-9000
1x SCPH-9002
3x SCPH-102
>>IT'S A SONY

Post Reply

Who is online

Users browsing this forum: No registered users and 7 guests