Since you already tested with a set of external speakers, you can say with some sort of good accuracy, that the internal speakers are defective. The speakers on the latitude d630 are one of the components that get damaged over time and continual use. It varies from user to user, but the components on the d630 which I see get damaged frequently are the; speakers, lcd hinges, keyboard and palmrest/touchpad. A pair of speakers for this particular model is going for about $9 plus shipping. They are easy to replace if you are comfortable working inside a laptop. Other than this particular speaker issue the D630 laptop is an excellent machine. It is very sturdy and I have seen them just keep going and going after many years of use. I see hudreds of these machines come in from off-lease corporate users and these units take a beating and just keep on ticking. yes, you can definitely get a bette, higher quality machine nowadays but if you are considering getting the speakers replaced, it is well worth in in the long run. The latitude series of machines are just not designed for end users and feature lower end GPU video chips that eminate less heat than the higher end video notebooks do. Less heat = a much more efficient laptop. I would definitely repair your D630, even if you no longer need it, it makes an excellent second hand computer for a child or student. If you need help getting the speakers replaced, do let me know. You will need to remove the power bar, the palmrest and keyboard to access the speaker assembly. Make sure you use a precision screw driver and a plastic scribe to avoid scratching the delicate plastics.
Mod Edit: Removed irrelevant data - Hamluis.
Edited by hamluis, 05 November 2012 - 05:20 PM.
Removede website reference - Hamluis.