Dennis M wrote: >Does anyone have an idea why very faint horizontal lines, spaced about 7 or >8 inches apart and about a quarter of an inch thick, would move slowly up >the TV screen after a DVD is played? One of the lines is slightly darker, >followed by a line that's slightly lighter. After a while they eventually >go away but I'm wondering what causes this. The same problem has happened >on two different TV's so I don't think it's a defect in the set (or the DVD >player).
You're describing a problem that usually has to do with the presence of a magnetic field near the CRT. Move your machines farther apart.
Dennis M <denn...@dennmac.net> wrote: >Does anyone have an idea why very faint horizontal lines, spaced about 7 or >8 inches apart and about a quarter of an inch thick, would move slowly up >the TV screen after a DVD is played? One of the lines is slightly darker, >followed by a line that's slightly lighter. After a while they eventually >go away but I'm wondering what causes this. The same problem has happened >on two different TV's so I don't think it's a defect in the set (or the DVD >player).
Sounds like RFI to me.
This is rec.audio.pro. We only do audio here. Throw your TV set away and get better speakers. TV will rot your brain. Listen to more music instead. --scott
-- "C'est un Nagra. C'est suisse, et tres, tres precis."
Scott Dorsey wrote: >This is rec.audio.pro. We only do audio here. Throw your TV set away and >get better speakers. TV will rot your brain. Listen to more music instead.
Music? Bah! You kids and your....music. Music is pap. The only things worth listening to are audiobooks and Old Time Radio shows.
Would asking about how to make high quality WAV, MP3 or MIDI files from a DVD source be On-Topic, there?
-- Mac Breck (KoshN) ------------------------------- "The Dresden Files" (2007) Harry Dresden: [re. Bianca] What is it about bad girls? They lie, cheat, won't suck your blood even when you beg them to, and for some reason, no matter how badly they treat us, we still can't walk away.
On Apr 17, 9:40 pm, denn...@dennmac.net (Dennis M) wrote:
> Does anyone have an idea why very faint horizontal lines, spaced about 7 or > 8 inches apart and about a quarter of an inch thick, would move slowly up > the TV screen after a DVD is played? One of the lines is slightly darker, > followed by a line that's slightly lighter. After a while they eventually > go away but I'm wondering what causes this. The same problem has happened > on two different TV's so I don't think it's a defect in the set (or the DVD > player).
horizontal bars that move slowly vertically are "hum" bars... they are 60 or 120 Hz interference and the TV frame vertical sync rate is 59.94 Hz. I have no idea why you are getting hum bars.
> Does anyone have an idea why very faint horizontal lines, > spaced about 7 or 8 inches apart and about a quarter of > an inch thick, would move slowly up the TV screen after > a DVD is played? One of the lines is slightly darker, followed > by a line that's slightly lighter. After a while they eventually > go away but I'm wondering what causes this. The same > problem has happened on two different TV's so I don't think > it's a defect in the set (or the DVD player).
"7 or 8 inches apart" gives us little to go on when we don't know what the reference is? (the size of the screen)
In any case, it sounds like typical case of "hum bars". It is the visual equivalent of mains hum interference in audio. Assuming that you are in North America or someplace where NTSC is used. Because NTSC has a vertical rate of 29.97Hz vs. the mains frequenty of 30Hz. If any power line 30Hz leaks into the video, it causes a hum-bar that takes ~10 seconds to roll up the screen.
Here is what I would do as a differential diagnosis: Unplug everything from the TV (except the power!) Turn on the TV (from cold, like in the morning after being powered off all night). Watch for the hum bars as the TV warms up. (Give it a couple of hours.) If you see hum bars at any point, then there is a problem with the TV, if not, then the problem is likely somewhere in the source (DVD player, etc.) It is not unknown to have things like this to develop after "warming up".
Mark wrote: >On Apr 17, 9:40 pm, denn...@dennmac.net (Dennis M) wrote: >> Does anyone have an idea why very faint horizontal lines, spaced about 7 or >> 8 inches apart and about a quarter of an inch thick, would move slowly up >> the TV screen after a DVD is played? One of the lines is slightly darker, >> followed by a line that's slightly lighter. After a while they eventually >> go away but I'm wondering what causes this. The same problem has happened >> on two different TV's so I don't think it's a defect in the set (or the DVD >> player).
>horizontal bars that move slowly vertically are "hum" bars... they are >60 or 120 Hz interference and the TV frame vertical sync rate is 59.94 >Hz. I have no idea why you are getting hum bars.
I went to a hum bar once. None of the working girls there had any teeth.
It was a pretty good time. No idea why I never went back.
In article <dennmac-ya02408000R1704082040060...@NNTP.InfoAve.Net>, denn...@dennmac.net (Dennis M) wrote:
> Does anyone have an idea why very faint horizontal lines, spaced about 7 or > 8 inches apart and about a quarter of an inch thick, would move slowly up > the TV screen after a DVD is played? One of the lines is slightly darker, > followed by a line that's slightly lighter. After a while they eventually > go away but I'm wondering what causes this. The same problem has happened > on two different TV's so I don't think it's a defect in the set (or the DVD > player).
Macrovision did that with VHS. Usually with DVD Macrovision will just kill the picture completely, but it's possible you're borderline.
You're still watching the DVD player as a source when this happens?
Did this happen on 2 different TVs and 2 different DVD players? If that's the case, do they have a common signal source like cable?
Dennis M wrote: > Does anyone have an idea why very faint horizontal lines, spaced about 7 or > 8 inches apart and about a quarter of an inch thick, would move slowly up > the TV screen after a DVD is played? One of the lines is slightly darker, > followed by a line that's slightly lighter. After a while they eventually > go away but I'm wondering what causes this. The same problem has happened > on two different TV's so I don't think it's a defect in the set (or the DVD > player).
These are the classic symptom of a ground loop problem. Some component in your setup - TV, STB, DVD player, sound receiver, co-axial cable line - is not properly grounded. You are seeing an effect of a 60 Hz cycle pickup somewhere in the system from something not grounded to the same reference ground as everything else.
Are all of your A/V devices connected to the same power strip or surge protector? If not, that can be the cause. However, for people who have cable (or satellite) TV, the most common cause is a ungrounded or poorly grounded co-axial cable line. Disconnect the co-axial cable line from the STB/DVR and see if the faint horizontal lines go away. If they do and you have access to the external cable box at the service area, check the grounding wire. A short term solution that sometimes work if your surge protector has RF passthrough connectors is to run the co-axial cable line through the surge protector. Depending on the design, that can ground the RF cable line.
However if you have a ungrounded co-axial cable TV line, you should be able to ask for a service call to fix the problem. Just don't expect the customer service representative to have a clue as to why you need a service call.
If all else fails, you can get a Jensen VRD-1FF Isolation Transformer for the cable line. But they cost around $60.
On Apr 17, 9:55 pm, klu...@panix.com (Scott Dorsey) wrote:
> Dennis M <denn...@dennmac.net> wrote: > >Does anyone have an idea why very faint horizontal lines, spaced about 7 or > >8 inches apart and about a quarter of an inch thick, would move slowly up > >the TV screen after a DVD is played? One of the lines is slightly darker, > >followed by a line that's slightly lighter. After a while they eventually > >go away but I'm wondering what causes this. The same problem has happened > >on two different TV's so I don't think it's a defect in the set (or the DVD > >player).
> Sounds like RFI to me.
> This is rec.audio.pro. We only do audio here. Throw your TV set away and > get better speakers. TV will rot your brain. Listen to more music instead. > --scott
Don't listen to Scott. Donate it to a thrift store like Goodwill, The Salvation Army, Value Village/Savers and/or Talize. And buy yourself a preemo flatscreen LCD or plasma model. You can get a 42" for $1000 (C) at Wal-Mart.
And just think... you'll be ready for the Feb. 2009 U.S cut off date for analog OTA broadcast signals and 2011 for Canada.
Captain Infinity wrote: > Once Upon A Time, > Mark wrote:
>> On Apr 17, 9:40 pm, denn...@dennmac.net (Dennis M) wrote: >>> Does anyone have an idea why very faint horizontal lines, spaced about 7 or >>> 8 inches apart and about a quarter of an inch thick, would move slowly up >>> the TV screen after a DVD is played? One of the lines is slightly darker, >>> followed by a line that's slightly lighter. After a while they eventually >>> go away but I'm wondering what causes this. The same problem has happened >>> on two different TV's so I don't think it's a defect in the set (or the DVD >>> player). >> horizontal bars that move slowly vertically are "hum" bars... they are >> 60 or 120 Hz interference and the TV frame vertical sync rate is 59.94 >> Hz. I have no idea why you are getting hum bars.
> I went to a hum bar once. None of the working girls there had any teeth.
> It was a pretty good time. No idea why I never went back.
You mean the TV was broken on the Karaoke machine?
