This thread has helped me immensely! I bought my wife a new Logitech remote then discovered that I couldn't get the IR to work on my Kenwood VR-509 receiver. It turned out to be the cold solder joint problem described on this thread. I created a web page showing some pictures of the repair. I also took a couple of macro shots of the solder joints.
Before:
After:
Here's a link to my web page with the additional photos:
[Link: home.comcast.net]