Strange Mod or Laser Problem?

[lufcfan]

Hi guys,
A couple of nights ago, I installed a Duo 2 SE into a V5 PS2. Everything went OK, and all the wires were good when checked with my multimeter. So, I reassembled and everything worked perfectly - apart from PS2 and PS1 copied CDs. All originals worked fine as did copied DVD ROM and DVD-Video - only these two things were giving me trouble.

So I disassembled again, check all my points again, and found still nothing. So, after this, I checked again and bam - still nothing happening with those two.

So, I took the chip out and last night put it back in. All points metered out correctly again, and the same problem!

Again this morning, I disassembled again and nothing untoward is wrong with that install.

The other strange thing is, is that the copied PS2/PS1 CDs make exactly the same noises as originals, and spin up exactly the same, even go black before the PlayStation2 or PS logo, but then it just stops for a few seconds, flashes up No Data and finally RSOD!

Now this bloody thing is doing my nut in, and I know I haven't done anything wrong judging by the way things function and sound and test out. So could it even not be the mod and it's the laser struggling for data once the disc has booted?

In the meantime, I'm going to ask my mate to see if I can borrow his 400R off him to try it.

Any help would be much appreciated and sorry for going on a bit. Thank you in advance...

LUFCfan