3 round dots on screen yellow red blue
I have to be honest with you, I suspect the marks are burns on the three picture tubes and permanent.
A simple way to prove this that requires no technical knowledge:
Remove the back cover and locate the three large lens (red, green and blue tubes) and with the set on cover each lens one at a time; if a mark vanishes that tube is burnt in the middle.
If you have three dots or tear shaped marks the set arced and burnt a small area of each picture tube's screen.
These tubes are about 4x5 inches at the screen and are like a regular tv screen; there is a phospher coating and if the set arcs it will burn the coating away in the middle of the screen on each tube.
Confirm this and if true two things would have to happen: replace all three tubes (not worthwhile) and find what caused the arc.
I do not like to give people bad news but I am honest and if this input helped or informed you give this solution a "very helpful" rating as I do this here for free.
If you have ANY questions or need advice do not hesitate to post a comment here and I will respond.
REGARDS, SD TECH
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