Convergence Issue for RCA R52WH76...

Inst_Pudding,
Please check the fuse again. Do not just pop the cap off and visually inspect it. Even if the filament appears to be intact, it's probably not. Like ctf1800 said, it's the fuse.
You need to test the fuse for continuity.
The problem that you explained is due to the blown fuse. There are no convergence IC's in this set. I'm am 99.9% certain your fuse has blown.
Get the fuse here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=220478092023
After you install the fuse, you MUST resolder the points at the flyback transformer which is located next to the fuse (red wires leading to it). Cracked & cold solder usually develops and will cause FL231 to fail again if you skip this step.

mine had the same problem. One fuse was bad. There are three red ones together. They are about the size of chicklet chewing gum. You can pull the red caps off to see if one is blown. My bad one was the middle one. I also replaced a capacitor but don't know if it was bad or not. Was told to do so while I had it open.

Try looking at the main board very near the flyback and you should see 3 fuse links (they look like hard capacitors) one of them is probably open causing lack or power to the convergence board by way of the ribbon seated close to the vertical output IC.
http://home.roadrunner.com/~drjoe/

Mine had the same problem. Found CL029 had a hole blown in the end. Part is a rectangle shaped capacitor located on the PSD board (HV). Looking from the back of the Tv, the part is about 2.5" from the right side of this board and about 4" from the back of the television next to a large heat sink. The part is a dark grey box capacitor.