DS Forums

 
 

Panasonic 29" RGB wavy lines


Reply
Thread Tools Search this Thread
Old 23-09-2006, 22:20
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155

Hi,
Have a 29" 4:3 Panasonic which is a few years old but still has an excellent picture quality. The problem is that when watching anything coming through from an external source, vertical straight lines can appear wavy, especially noticeable on the Sky banner or BBC News visual aids. The problem is most evident when viewing RGB signals from the Sky+ box or Panasonic DVD Recorder, but even S-Video signals have the same problem (though much less obvious). The TV's a TX29AD2DP bytheway.
Thanks in advance,
Chris
c_bro is offline   Reply With Quote
Please sign in or register to remove this advertisement.
Old 23-09-2006, 22:57
Hal_loe
Forum Member
 
Join Date: Sep 2005
Posts: 440
Don't know if this helps but my Panasonic TV suffers from leak through on the scarts of the RF picture.

So for example if you were watching BBC 1 before you swithed to the AV input you would get the picture appearing in the background moving about.

My fix is to simply go to the VCR channel with the VCR off (ie a black picture) before switching to the AV input.

I believe you can also cure this by cutting one of the wire in the scart lead.

Hope that is of some help.
Hal_loe is offline   Reply With Quote
Old 24-09-2006, 15:18
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155
Thanks, you're right about that! I also noticed the problem with the RF / Scart leak but didn't realise it could be sorted or indeed related.
Cheers,
Chris
c_bro is offline   Reply With Quote
Old 24-09-2006, 17:05
fat controller
Forum Member
 
Join Date: Oct 2005
Location: Slightly round the bend
Posts: 12,685
Try some good quality SCART leads that are individually screened, this should cure the leak through. Be sure that they are individually screened though, as some (even good quality ones) are not, they are simply screened as a whole which doesn't fix your problem.
fat controller is offline   Reply With Quote
Old 24-09-2006, 22:38
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155
Cheers for the reply but I'm not entirely sure what you mean. (excuse my ignorance ) Could you explain.
Many Thanks,
Chris
c_bro is offline   Reply With Quote
Old 25-09-2006, 10:38
Orbitalzone
Forum Member
 
Join Date: Oct 2000
Location: Sussex
Posts: 12,173
Individually screened scart leads means that the small wires inside the scart lead have a screening wrapped around each wire to help prevent the signal 'leaking' out across into another nearby wire.

What usually occurs is that the TV scart socket is always outputting a video signal (an analogue TV channel from the TV's built in tuner) even when you're using the scart socket to accept and INCOMING signal, so the output signal can 'leak' into the incoming signal from your digibox or DVD causing wavy lines.

You don't need to spend £30 on a scart lead, a £10 scart lead that states that it's got individual screening should do the job.... these are thicker scart leads than the £2 ones you fine at B&Q etc.

I've also seen these wavy lines on cheapo S-Video cables....
Orbitalzone is offline   Reply With Quote
Old 25-09-2006, 23:18
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155
Originally Posted by Orbitalzone
Individually screened scart leads means that the small wires inside the scart lead have a screening wrapped around each wire to help prevent the signal 'leaking' out across into another nearby wire.

What usually occurs is that the TV scart socket is always outputting a video signal (an analogue TV channel from the TV's built in tuner) even when you're using the scart socket to accept and INCOMING signal, so the output signal can 'leak' into the incoming signal from your digibox or DVD causing wavy lines.

You don't need to spend £30 on a scart lead, a £10 scart lead that states that it's got individual screening should do the job.... these are thicker scart leads than the £2 ones you fine at B&Q etc.

I've also seen these wavy lines on cheapo S-Video cables....
Ah....I see.... I'll have a look for such cables and hopefully get it sorted. Is this a problem with Panasonics only? And is it possible to cut the offending wire (as mentioned by the second user) or is screening the only option? The reason why I'm asking is that while I switched the analogue tuner to VCR Channel 0 and that drastically helped the problem, on closer inspection I can still see static which is probably because the VCR channel on the TV displays white noise when no VCR input is being displayed.
Please advise, (oh and thanks for your help - very enlightening!)
c_bro
c_bro is offline   Reply With Quote
Old 25-09-2006, 23:33
Orbitalzone
Forum Member
 
Join Date: Oct 2000
Location: Sussex
Posts: 12,173
Yes you can just snip the offending wire - on the scart plug that goes into the tv, open it up, find pin 19 (there's usually tiny numbers)

This page should help (half way down 'video breakthrough')

Also you can get audio breakthrough,pins 1 and 3 to be cut (only do if suffering with audio problems)

cutting pin 19 makes the lead a 'one way scart' so if you remove the lead and it'll only work one way round.

That link has a lot of good info.
Orbitalzone is offline   Reply With Quote
Old 25-09-2006, 23:39
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155
Originally Posted by Orbitalzone
Yes you can just snip the offending wire - on the scart plug that goes into the tv, open it up, find pin 19 (there's usually tiny numbers)

This page should help (half way down 'video breakthrough')

Also you can get audio breakthrough,pins 1 and 3 to be cut (only do if suffering with audio problems)

cutting pin 19 makes the lead a 'one way scart' so if you remove the lead and it'll only work one way round.

That link has a lot of good info.
You're a genious! Thanks for your help!
Regards,
c_bro
c_bro is offline   Reply With Quote
Old 26-09-2006, 00:16
c_bro
Forum Member
 
Join Date: Feb 2006
Location: Northern Ireland, UK
Posts: 155
OrbitalZone - I'm delighted with the results of this, I really am! I've spent years with this problem and FINALLY it's fixed. I just pulled PIN 19 out completely and it worked like a charm! I know I'm going on and on but really this is the first time I've had a clean AV signal and picture on this TV ever.
Thanks again,
c_bro
c_bro is offline   Reply With Quote
Old 26-09-2006, 09:24
Orbitalzone
Forum Member
 
Join Date: Oct 2000
Location: Sussex
Posts: 12,173
Glad it worked!

I'd suggest covering the pin/wire in some tape to stop it touching any other wire inside the plug (there's some volts on pin 8)
Orbitalzone is offline   Reply With Quote
 
Reply




 
Forum Jump


All times are GMT. The time now is 17:13.