COLOUR T.V

[prateeksikka]

HI ALL!

I HAVE SEE MANY T.V CORDS WHICH CONNECT IT TO
230V AC.BUT I HAVE NEVER SEEN A 3 PIN CORD.i.e A TV
I HAVE NEVER SEEN GROUNDED.CAN ANYONE TELL WHY?
PRATEEK

[MP]

My TV has a three prong plug on it for grounding.

MP

[pejmanajorloo]

You can see this site
http://www.iguanalabs.com/7805kit.htm

[masterteach]

safety (earth) ground is not needed by most modern tvs
because they use double insulation for safety from electrecution

[prateeksikka]

hi all!
anyone who can relate the reason with high voltage inside the TV?
AND IF PROPER DOUBLE INSULATION ,WHY ARE NOT OTHER DEVICES LIKE AIR CONDITIONERS,ELECTRIC IRON,REFRIGERATORS MADE SO?
PRATEEK

[gg4rest]

There is high voltage inside a TV set to launch the electrons through the CRT with enough velocity to cause the phosphor coating to light up. There is also a high voltage for the steering coils to cause the electron beam to curve to allow it to hit the top and bottom rows of the set and to scan across each row.

I assume TVs don't have a ground pin because they likely have an isolation amplifier inside them which would separate the TV set from the household power. This would prevent noise from the household power from recking the tv signal. I'm not sure though. The reason that Air Conditioners, irons, and refrigerators would not, is because noise travelling to those devices is typically not as big a problem so an isolation transformer wouldn't be necessary.

[MP]

My TV, and the air conditioner for my shop, and my refrigerator all have a 3 prong plug. 8)

MP

[Dazza]

MP, a refrigerator for your lunch and an air-conditioner to keep you cool, so you can be productive 8), but what's the TV for ;D, do your employees get a TV as well ;D ;D ;D.

[MP]

uhh....research, yeah, that's it. It is a productive tool. ;D ;D

...actually, the TV and refrigerator are not in the shop. Only the air conditioner is in the shop. ;)

MP

[gg4rest]

My TVs all have only 2 prongs.

[prateeksikka]

hi all!
does it have to do with very high voltage inside it?
i know that i have to be careful when i open up a TV rather in all AC circuits where netvoltage is not the algebraic sum but phasor sum of the drops across the components.
any comments?
prateek

[steven]

:)the 3 prongs plug on the tv if you wonder what that lonely looking prong is it is the earth prong, in the case of a short or hv wire comeing off inside , then the hv will be grounded  through that earth prong