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Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
The tv dam light engine block it is the causes an the problems.This a major design flaw in the tv light engine block by the tv Corporations Samsung,Mitsubishi have this problems more than the other big screen tvs brands.A brand new tv?Take ur warrenty repair quickly,this things wouldn't stops.The white and black dots will continue and keep comming more and more.Until the tv have replace the light engine block or have it replaced another cuircuit board that help the light engine block too work.
I had a problem with the TV going on and off several times before "warming up" and then having pink dots. I would have to reboot to get rid of the dots. I called 1-800-SAMSUNG and reported that I had problems with the capacitors. That is what was causing the problems - cheap capacitors and Samsung is aware that this has caused many TV's to malfunction. My set was not under warranty but Samsung sent a technician across two state lines to fix my TV. As long as the problem is the capacitors Samsung will cover this service call 100%. My TV is fine now. BTW - capacitors which are sold in Radio Shack are not expensive. Why Samsung chose to put the cheapest Korean capacitors in their expensive TVs is a mystery. So if your TV need warming up and has pink dots on the screen - call 1-800 -SAMSUNG and tell them your capacitors are malfunctioning.
I have been having the same problem.
It started as constant white dots obscuring the menu but as you hardly use the menu I left it.
Then I had a row of white dots 5 dots high all the way across the screen about two thirds of the way up. This only happened on Ext1 and Ext 2.
I tried 3 different Scart and A/V cables in ALL the possible connections in the back and still I got the dots.
This has gradually got worse and I now have a screen full of flashing dots.
With it being out of Warranty (18 month old) I have been referred to a company to repair it.
Estimated cost £263.37 inc VAT
Diagnosis: Needs a new PCB board
Time to fix: 1 week
I shall update once I know more/final cost, on Wednesday.
In future I shall be taking the extended warranty out. :o(