simple way to discharge those pesky Caps (so they dont discharge into you). First off, MOST capacitors hold charge for only about 24 hrs MAX (some larger ones hold longer) depending on the electrolyte (chemical inside). anything that has been powered off and UNPLUGGED for a week or so SHOULD be safe. if you are unsure how long it has been out of service, you can plug the unit in and turn it on. while it is still on unplug it and let it slowly power off that way. If using a TV / comp monitor, you will notice thebrightness slowly fade - this is because the cap is discharging at its designated rate.
Also when opening a TV, be careful to NOT break the CRT (picture tube). if you do, and notice a powdery cloud HOLD YOUR BREATH and get away from it until it settles (once away u can breathe again ) The inside of the screen is coated w/ phosphorus (which is what creates the picture when exposed to high voltage) and when the vacuum is suddenly removed it becomes airborne & can do a # on the lungs. To avoid this situation use a pair of pliers, grab the nipple @ the end of the pic tube, and wiggle til it cracks and the vacuum will slowly neutralize in pressure w/out creating the phos cloud.
There You Go Getting All O/C Education On Us Again