DMS4 Lite bios works, won't boot anything

gathius · 04-10-2006,02:29 AM

Hi,

I am installing a DMS4 Lite on my v12. I have everything connected, and it seems like it should work, but will not read any cds.

When I boot it, if I press square, I get the message DMS4 Disabled...
Also, it passed the test mentioned in the installation of the Neofix chip.

I have verified all of the leads, from the pins of the ASIC on the DMS4 to the PS2's DSP or other points on the motherboard. My ground wire is 20awg and short. Everything seems to be in order.

However, when I boot it, it spins up the disc, but will just give me the 'spinning electrons' boot screen and come up to the menu browser/system config.

If I go into the browser, if there is a regular PS2 game in the drive, it will say 'there is no data' and at the bottom say 'reading disc...' then after a few minutes, it will say "The disc could not be read." If I have the Toxic boot disc in the drive, it will do the same thing, but right away.

I think that it may be a problem with the laser but I don't know how one would diagnose a problem like this. I can hear the laser tapping the dvd sometimes, is this normal?? How can I verify if my laser is toasted?

Thanks!

**EspeN** · 04-10-2006,03:56 AM

1) remove the laserfix completly.
2) When you test it next time, dont put on the PS2 cover because you want to see how the laser act when you try to boot game.

Press the little black switch on the reset/eject cable at same time as the as you press the little black switch on the left/back on the machine.

THen the laser will spin up, and you can see what really happend in there.

THis could be as easy as damage on the tracking when apply the laserfix.
and its easy to fix by replacing the tracking resistors.

gathius · 04-14-2006,02:33 PM

hi, thanks for replying.

I ended up fixing the problem by switching a a wire that was soldered to the wrong point on the Neofix PCB. The conole then worked great and booted everything I threw at it. For about three days.

Then during the middle of a game it crashed. I rebooted the game, loaded my savegame, and it crashed again. I waited 24 hrs to see if it was just a transient problem, but now it will not boot anything.

I removed the Neofix PCB, but no luck. I can still access the TOXIC boot menu, so I believe the DMS4 is functioning correctly. If I start the unit up without the cover on so I can see the disc, it starts to read the disc, it does the few initial reads to determine speed etc., starts reading it at a faster speed, then stops.

I had this problem before when I tried running it without the cover - it needed the cover to be able to read the disc. After reinstalling the cover, it would then read the disc. However, now when I reinstall the cover, it still does not read the disc. I believe it may be a problem with my case - it doens't seem to close all the way correctly. In the corner with the power button, the unit doesn't want to stay together. If I just let it try to boot, I can't hear any movement of the laser, but if I squeeze the corner so the safety button gets depressed, I can then hear the laser spinning and tracking, but still no boot!

So I guess I'm stumped as to whether it's just a problem with my case (which I have spent a long time trying to get to fit better) or if it is an actual problem with my laser system. Will installing a fix like summOne's make any difference? I will probably do the resistor fix and possibly the subzero fix, but for now, if it won't boot with no fix installed, I'm guessing it won't boot with any fix.

If it makes any difference, mine is a 12.2.

gathius · 04-15-2006,02:03 AM

ok I fixed my case, but the unit still will not boot anything. It tries to read the disc several times but just gives me the generic menu. I can still get the TOXIC menu. Again, what can I do to diagnose this? Could it be the modchip?

Also, does having wires soldered to points but not leading anywhere affect the system adversely? I left the neofix pcb wires soldered to the board, but snipped the ends.

**xmod** · 04-15-2006,02:14 AM

Well, to test whether its your modchip thats makin the fuzz, try booting the ps2 without the fix and with an original game... if it boots then clearly its the modchip if it does not then chances are that it could be your laser thats causing probs..

gathius · 04-15-2006,02:28 PM

ok sounds like it must be the laser then, since I've removed the fix and it still will not boot anything, original or not. Could someone please explain to me the difference between the different laser crashes? I think the most common is mechacon crash... what is that?

I guess the main question is, is there a part of the laser system that wouldn't be fixed by the subzero fix? What I think I will do is order the subzero fix pcb and apply that fix along with the summOne resistor fix. Hopefully the subzero fix will override whatever controls are currently not functioning correctly... can anyone say anything more about this?

Also, has anyone applied both the subzero and summOne fixes? Is that common or even necessary?

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