It appears like scraches. It might be dust. I woundered if there were wires that might prohibit me from removing the entire screen and taking a look inside. I noticed screws that attached the screen to the base.
Other than these irritating marks the TV works very well with good colour
No you can not take the screen off to look inside. These sets are accessed from the rear, however do NOT attempt this on your own as there are fatally dangerous voltages present.
Visual anomalies on a projection TV are due to bacteria growth in the projection coolant.
Frankly it is cheaper to throw this away and replace with a modern flat screen that can be hung on your wall.
Here is one for $329
https://www.bestbuy.com/site/toshiba-55-class-54-6-diag--led-1080p-hdtv/5861001.p?skuId=5861001
SOURCE: need to remove screen cover
you have to remove the back of the tv to clean the inside screen.
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