My plasma TH-42PV7HS problem is after on first ok, a few second the picture over green. some people on tv hair is green colour. HELP ME!!

Yes it should still be covered find ur direction book and check out ur warranty and see if Panasonic will come out and cover it. Always beef up ur story you have been Panasonic owners for years when u call them. You have gotten all of ur friends and family to switch ect... Even if it's not covered sometimes loyalty goes a long way.

the colour sensor on the picture display may have lost functioning....as in case of plasma tv`s the they use transistors for colour ......so better call a technician from the related company and do a check up.....no other solutions i hope.....

http://service.us.panasonic.com/OPERMANPDF/TH42PZ80U.PDF

Here is a copy of your users manual, it tells you how to adjust the color on the TV, Magnets do not affect Plasma TV's. If your picture looks bad you might have a defective or failing part if you just need to turn the red up or down or make the picture more blue or green the users manual tells you how to adjust it.

Same issue with - Panasonic TH-50PX70A , power UP with red standby, then power ON by remote - only Gives GREEN led blinking 35-40 times, followed by solid green led with no no picture no sound.
>> Solution; unplug Plasma from AC 10-15min, then plug in & power on to Red standby led,, At this point - Power ON tv while holding down both -Volume Down and F (function Select) buttons (front panel door) at the same time turns picture ON,all ok.

It's called Cyan and it's sound like you are having a problem on your D-board. Look for capacitors bulging out and replace first if not then order D-board

I would try a new T-CON board first.

when doe s this happen on hd tv bad signal on antenna will cus ethat to happen heavey comprsed dvd bunred will also do it may need better antenna ok

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CHANGE P.A BOARD. THIS BOARD IS FOR TUNNER VOLTAGE..IF THIS BOARD IS BAD, THE LED FLASH 10 TIMES IN RED AND THE TV NO TURN ON.

If it's just one video plug, then perhaps you have to set av5 as being in colour somwhere in the menus.  If you require three wires for the pictures, as blue, green, and red, then make sure they aren't in the wrong ports.
Good luck.