IV got a radio shack remote control 15 8926 and want to link it to a Panasonic high definition plasma TV TH-50PX80U

SOURCE: I am hooking up a

check your connections. it sounds ( looks ) like you may have connected the video cables incorrectly. the inputs and outputs are color coded, even if the cables you are using are not you can still use them.

SOURCE: TV Screen Stripes

NOt very clear.....

Multiple stripes all over the screen? Vertical or horizontal?

If it's only like an inch vertical lines put a mark on the cabinet where exaclty the line is, turn off the TV then open the back, you'll see lots of ribbon wires (gold color) from the plasma panel it self going to buffer boards, using the mark find the closest ribbon wire where the line is showing then remove and clean the contacts, make sure to reseat it properly when putting it back otherwise you'll just add more lines or black bar on the screen if pins are not seating properly.
But do not be afraid if the lines get worst just turn the power off right away and reaset the ribbon wire till you get it correctly.

CAUTION;
DO NOT try to do this while the TV is on oherwise you'll burn COF (Chip on film) on the panel and you'll end up replacing the whole PDP.

Good luck!

SOURCE: sony remote control codes to operate TH-37PX8B

Can't be done, the buttons for the tv functions are only for sony tv's. Sorry.

SOURCE: Desperately seeking a service (repair)

I have searched for quite some time for this Service Manual for you for free, and it just is not available anywhere online. The best I can find is a place you can purchase it from and receive an instant download, for $7.95. Definitely much less expensive than buying it directly from Panasonic, or taking it to a service shop. So sorry I couldn't find a free one for you.

Please make sure you rate my answer 4 thumbs up, it is extremely important to me. I would be forever grateful if you could do so. If you need more help on this question please just respond to my answer here and I will get right back to you.

Here it is for $7.95:

http://kxtga.com/p8u865uicth50p780u6mrvicm28u58lgph11duch866i6-p-296.html

SOURCE: what is a pcb printed circuit board and where are

A PCB Printed circuit board is every single board in your TV. That is what PCB stands for Printed Circuit Board.