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moire-type pattern on black screen (1 Viewer)

DaveKahler

Stunt Coordinator
Joined
Nov 23, 2002
Messages
73
When the tv is very dark (most noticeable on total blackout), there is a horizontal moire-type pattern that's really annoying me. You can see the lines especially during scene changes. It's most noticable when the tv is just in a blank a/v mode, though.

Any ideas on how to fix this? I've tried disconnecting all inputs, and it's still there.
 

DaveKahler

Stunt Coordinator
Joined
Nov 23, 2002
Messages
73
It's horizontal lines, at about the middle 2/3 of each side of the screen, that converge toward the center of the screen. They also tend to be visible only near the edges, i.e. they pretty much disappear about 5-7" away from the sides. I have a panansonic 27SX12 27" flat screen, by the way.
 

Allan Jayne

Senior HTF Member
Joined
Nov 1, 1998
Messages
2,405
The shadow mask in the picture tube may have a horizontal line structure. Usually the phosphors are in long thin vertical red, green and blue stripes. Except for Sony's, there are thin horizontal bridges that connect the vertical ribs of the shadow mask and you can see them using a magnifying glass while viewing a medium gray solid "test pattern".

If the scan lines clash with this bridge pattern, you get these moire patterns. The moire is often accompanied by pincushion distortion and otherwise not quite straight and level scan lines.
 

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