Samsung la46mb1bdx/xsa full screen coloured lines

[tuney]

I have this Samsung LA46MB1BDX/XSA lcd tv and it has a problem with coloured lines all over the screen.
I was given this tv by a freind when it had the click of death, I replaced the caps and had to reset the eprom before I got it going. It has worked beutifully for about a year untill one day when I turned it on the screen was just full of verticle very thin coloured lines. There is no sound and no picture behind them. After it was obviouse that it was not going to get better I swapped it out for the old 40 inch lcd that I had spare. This tv has now died and I have not figured it out yet.
I plugged the Samsung back in and it worked perfectly, only problem is that if you turn it off it goes back to the coloured lines next time it is turned on. If you unplug it for atleast 12 hours it will work just fine when turned on.
I have been searching all the forums but cannot seem to find one that is just like mine so I wondered if anyone could help me please.
I am an amateur at fixing these this but have been fixing anything and everything since I was a kid, I don't know a lot about LCD tv's.

[tuney]

Re: Samsung la46mb1bdx/xsa full screen coloured lines

Ok, well I have now replaced all the caps on the power board thinking that maybe the ones I used before could have been a problem, no changes though.
I was wrong, there is sound when the coloured lines are on the screen. I thought it might also be a t-con issue as I have read about this board causing similar issues but I figure that if it works perfectly provided that I plug it into power just before I want to use it then this board should be ok.
The issue is caused only by the unit being in stand by for more than 10 minutes or so. I can turn it off and then back on and it is ok but if I leave it plugged in then it's no good again.
I could really use some help with this as I would like to fix it if it's possible.
Thanks

[tom66]

Re: Samsung la46mb1bdx/xsa full screen coloured lines

I've repaired an LE40R81 (I think), which is a similar set. A voltage regulator was bad on the T-con causing the same symptom.

[tuney]

Re: Samsung la46mb1bdx/xsa full screen coloured lines

Thanks for that, I will pull it apart and have a look at it. First I need to do some reading so that I will know what I'm doing.
Cheers