How can I figure out what blu ray drive is required for me PS3?

I bought a non-working PS3 with the understanding that it only needed the lens cleaned. I bought a blu ray lens cleaning disc, which didn't solve the problem, so I opened it up, cleaned the lens well, put it all back together, and still nothing. The unit works, it just can't read any discs. Any ideas?How can I figure out what blu ray drive is required for me PS3?
Obviously, it needs a new laser assembly. Refer to the chart in the link on which assembly your PS3 uses (towards the bottom):

http://www.edepot.com/playstation3.html

Brand new PS3 laser assemblies aren't sold anymore and are hard to come by, so be careful when shopping online.

By the way, this is why you don't buy non-working PS3s regardless what the problem is. A dirty lens never causes the PS3 to not work. A failed laser assembly does, though.

remedies blackheads