Craig wrote:
> Hello,
> the past few months or so I've noticed our set exhibiting a behavior I
> didn't notice before. While watching the screen, I notice a small ripple
or
> wave move across the screen. It seems to move across the entire screen,
> originating on the left and moving off screen to the right. It's mostly
> noticable only when watching a static, contrasty display (such as a set
top
> box menu). It seems to occur randomly, but lately it's been occuring
more
> frequently (perhaps 3 or 4 times over the course of an hour).
>
> At first I thought this was an artifact of Directv, as I did a Google
search
> and another person had this problem and thought it was due to his
satellite
> equipment. (He never did receive a reply to his query). However, the
other
> night I was watching a movie and noticed the same ripple (I was able to
pick
> it out since my eyes at that moment were focused on a calendar that was
in
> the background).
>
> It seems to occur regardless of input (it happens with both HDMI and S
video
> inputs). The set is a Samsung HL-S5086W DLP and is about a a year and a
half
> old.
>
> Has anybody else experienced this issue? What is (was) the cause and how
is
> it resolved? Thank you,
> Craig
If the artifact was a band that moved up and down the screen
vertically, then it would very likely a ground effect loop. A ripple
moving horizontally could be something related to the DLP
implementation, but I have not kept up on DLP TVs.
Still, you should verify that it is not a ground loop issue. Ground
loop results when one of the A/V devices, STB, TV, or input line is not
grounded to same reference ground as the rest. Poorly grounded or
ungrounded cable TV co-axial lines appear to be the most common cause of
ground loop from posts on avsforum. If you have cable TV, physically
disconnect the cable line to the cable STB/DVR or TV and see if the
ripple is still there on DVR playback sources. Other steps to confirm
ground loop is to disconnect 1 A/V box at a time to see if the possible
ground loop goes away. Or make sure that all the devices - TV, STB/DVR,
sound receiver, DVD player - are all plugged in to the same power strip
or surge protector.
Alan F
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