In reply to ksjs:
As others have said, the most common fault that causes a pop is an electrolytic capacitor. Often the one in the power supply swithching regulator (a very common fault with Freeview boxes or supplies).
If you're lucky, you'll just have taken out the capacitor and fuse, but it may also have taken out the switching regulator. Sometimes, this explodes so violently that you can no longer identify it from the remains...
Caps often leak before they fail (which is why they fail), so look for residue around all the big-looking caps.
Also heed the warnings about residual voltages; a colour TV can have around 36kV in the back, which will give you a nasty shock. It
should have a discharge circuit fitted to it.