I'm about to embark on a repair project for my Sony KP-43HT20. I am familiar with working on power amplifiers for instruments and I know that there are capacitors in those amps that can contain lethal voltages--even after the amp is unplugged.
Wary of getting fried by my TV, can anyone tell me if the TV contains any components which store dangerous charges AFTER the unit is unplugged? If so, any tips on draining or discharging those voltages would be appreciated!
What is supposed to happen and what does happen are two different things, normally if the set is running perfectly the capacitors will drain like they are supposed to. But of course in repair it is very possible you will find a charged cap, obviously the bigger they are the more they can hold, pay special attention to the caps after the initial bridge rectifiers on the hot side of the chassis. CRT's second anode lead (the big red one) can contain extremely high voltage 30,000 some odd volts in some cases. The crt's act as capacitors and can store these charges. There are circuits built into the Television that is supposed to drain off these voltages when the tv is off. But again never rely on that. Unless you see some warning to the contrary always discharge the crts, to the DAG ground, it will be the braided strap around a regular picture tube, and probably some copper or brass finger like flanges on projection televisions. I hate giving people advice about what not to touch because I can’t cover everything, and even with what I have said hazards exist, you need to follow some basic rules, Never have both hands inside the set at once. Second make sure no part of your body is touching any piece of metal that can be used as a ground. Even with precautions in place you can still get shocked, I have been a tech for many years, and I have gotten a few jolts in my life. But it is a hazard that comes with the job. Don’t expect what I have said will prevent you from getting shocked. IT is only some guide lines.