ps2 error and modchip

[orntar]

a friend of mine is giving me his ps2. actually i am buying it for like 60 dew points. hehe. nothing i want from mountain dew anyhow.

it has some troubles reading discs (DRE), he took it to someone to try and fix it, but the guy just sat on it forever and now he is getting it back.  is there some definitive thing i can do to diagnose and fix it? i found a whole sony laser assembly for pretty cheap that advertised it will fix DRE's. a good idea? i have tried adjusting the lens pot on a dc, to no avail, so i am leary about the theory now.

i do not have it yet, but i beleive it is a v1-v4.

next what is a good mod chip for it? i heard the duo is the best price/function ratio. thanks for any input. i'll let you guys know whats up when i actually get it.

[Edgedamage]

Try this link.
http://faqs.ign.com/articles/390/390535p1.html