A little DIY job I recently did.
Our Bell PVR died, it would run for about 5 minutes, then the video would freeze, then the sound would go shortly after. I unplugged the internal hard-drive and it seemed to work fine, so, bought a used hard-drive, installed, same problem. Investigate more closely, noticed several capacitors are bulging on top, caps are in the area dealing with recording and buffering from what I can tell.
See the bulgy top? Bad sign.
I had 4 bulgy 1200 microfarad 6.3v and 4 x 820 microfarad 6.3v .
Sorry, no after photos, but I found half the caps at a local electronic shop, had to order the others online from Montreal.
Replaced the caps (not the easiest board to work on) and now it's working great.