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So many people waste money on replacement lasers (not saying you did). More often than not, if a laser still reads even a little, it can be repaired far more easily than replaced. Its only a matter of making sure the parallel adjustment between the laser assembly and disc is right (small white cog behind laser assembly controls this, and can be manually turned). And a matter of clearing the fog off the laser lens. I've done this with a Dremel, a clean/new buffing wheel, and some of the Dremel polishing compound. Makes a v4 that cant read anything work like its brand new. As long as the laser is not physically damaged, or broken all together, there is really no point in replacing it. It's wasted time and money. If you don't have access to a Dremel with a clean buffing wheel, a $1.99 pack of micro-fiber cloths (not the big ones that look like rags), and a little polish will work just the same when combined with a little elbow grease.
Getting back on the topic, as long as you have a good suction pump (i prefer small spring activated), removing solder is easy as pie. It only takes a second to go from solder to mercury-looking blob, and in that instant you bring in your pump while moving your tip (like working the clutch and gas in a manual transmition car). Push the button on the pump and that blob will dissapear before you even get a chance to fry your components. When I first learned this techique I had more trouble melting the tip of my pump than burning circuit boards. Which really wasn't a big deal.
-google is my friend, would you like an introduction?
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