Insignia NS-PDP32-09 Purple Dots

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/

Have you checked all your input cables & connections? Does it do this on all inputs?
If all inputs act the same & all cables are known to be good, then Most likely the Main PCB.
Part#s, price & availability listed at the following site:

http://www.shopjimmy.com/insignia?restrictBy[master+part+type]=Main+Board

Purple Panasonic PC>TV Problem:
The VGA cable uses three primary color RGB channels.
Red, Green, and Blue.
The picture is made up of pixels or dots arranged in a grid along the "X" horizontal axis and "Y" vertical axis.
The computer mixes the intensity of each color channel to create a unique color per pixel.
All RGB at 100% creates white.
R+G creates yellow.
R+B creates magenta, ie purplish.
G+B creates cyan.
So a purplish tint sounds as if your Green wire has no signal, which may indicate a faulty VGA cable or VGA socket.
Put another way, (R+G+B)-G=R+B=magenta.
So try another VGA cable, spray all socket pins with "Servisol " or similar contact cleaner.
0%<--------->100%
Cyan<------->Red
Magenta<--->Green
Yellow<------>Blue
All 0%=Black; All 50%=Grey; All 100%=White.

you have a faulty parts inside..try to disconnect one by one the supply of all board until you get stable lights..

This would have to be some sort of defect on the motherboard as long as these dots are only noticed when you turn on your console and not noticed while watching tv.

bvla

well u have stopped ur movies(dvds) to many times and the dots are burn marks on ur screens
if u read ur manual it will tell u NOT to leave a still picture on for to long as it will damage ur screen
i assume u have a PLASMA TELEVISION
if not... sorry cant help u

Dont have a solution, my samsung 46 inch is doing same thing. Have you found a solution?

I had same problem

This is a manufacturing defect that happens to about 50% of Wii Consoles. It is caused by the lack of fan cooling while the console is in standby mode. The networking card creates excess heat that damages the graphics processor. This is an extremely common problem (happened to my own console!) and Nintendo will repair or replace your console for free if it is still under warranty. Outside of warranty, I think the repair costs around $75.