Messiah 750 Random Problems on new Slim EURO PAL 75004 GH-041-34 PS-2!!

[retroborg]

Hello,
I just installed a Messiah 750 Mod chip in a brand new Slim EURO PAL 75004 GH-041-34 PS-2.
http://www.cj-inter.com/modchip/smal...AND%20NTSC.jpg

The chip does work, but I encountered some problems!
Some times in random, when I insert a PS-2 game CD/DVD (Either original or copy), it will begin to boot but after the ?PlayStation 2 Logo? shows up, it will show the Red screen saying that it does not recognize the disc. Some times it will even go past the PlayStation 2 logo screen but it will give me the Red screen after the game title screen shows up and after I press the start button.

This happens randomly in both original & copied CD/DVDs and I don?t seem to find any specific pattern!

I used the H2O V14 diagrams:
http://d-vices.com/subzero/h2o-14.jpg

I have connected the ?Z? point but not the ?H? or "F" point which is for the Japanese PS-2s.

The only thing that could have gone wrong was that I originally connected the 5V point of the chip on a ground point on the PS-2 PCB. So when I 1st started the PS-2 it did not boot up at all, but I corrected that and now it works but with the above random problems.
The rest of the connections are all fine.

Could this be a defective chip?

I've read that you should not connect the "Z" point, but could that be causing the problem?

Any help will be appreciated.
Thanks in advance.

[cleo]

Yeah have had this problem on Gh41-04 board. RSOD randomly after ps2 logo . I was using the gold dot h20 though. Great chip for anything up to v13.But in the v14's they have this problem. I would guess that it's the same problem with the messiah 750 . I tried everything but couldn't fix the problem. Used a different chip and all works well now. I used a Modbo745.

Hope this helps

[retroborg]

Yes, thanks for the info!

I disconnected point "Z" but the problem persists.


How about the MOBBO 750 v1.82?
Will that solve the problem and work better on the GH-041-34 PS-2?

Is the MODBO 750 v1.82 an ?Autoboot? mod chip like the Matrix Infinity or do you have to press Reset button to cycle between PS-1/2/DVD modes?

If so could anybody post the operation modes for the Modbo?

Thanks in advance.

[wmb88]

modbo750 is the same as modbo4.0 and in function it's the same as 745 just different layout. the 750 uses an extra wire for clock. i have tested it in a pal v14 and it seems to be pretty well.

[badrianiulian]

I know this post is old but for whoever runs into this problem, I found it to be a power issue. Replaced ground and voltage with thicker (and shorter) wires and all went well.