Samsung PS42C450B1W Plasma Horizontal lines

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

I must have done something wrong...

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Bloody 'ell, it's stronger than I thought! Are you playing live, moving video on it? That stresses the ICs out a lot. A "no signal" display uses very little power and is too kind to the ICs. Basically each vertical transition uses power (so the most power consumption in the X-drivers comes from every second row being fully lit, if that makes sense... on off on off... as it has to change the "state" of the output at the highest frequency it can, it uses more power to do it because it has to drive the panel capacitance. The same applies to LCDs although it's quite hard to burn those out as they are rarely heatsunk.)

[freakaftr8]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Yes I had run a dead channel. Snow did it for me.

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Yeah i have the sky box connected to it, What if i try using a test video like this??

https://www.youtube.com/watch?v=VN-KIlsxxOw

Would that work better?

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Could you just play normal video on it, like a TV? That pattern is too energy efficient -- the movement goes in the wrong direction.

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

yeah i am already playing normal tv on it..

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Hmm, it's a tough one this one... is there any metal in between the tops of those brown ribbons and the panel? Maybe that is another heatsink. If so, try to remove it...

It's really surprising how long this one is lasting because Samsung seem the worst for panel failures (both LCD and plasma) so I honestly would have expected the panel to have baked by now!

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Ok so there was another heatsink bar under them with thermal compound under each IC so that was keeping them cool, Now it will fry... Here's pics

https://lh3.googleusercontent.com/-p...218_225517.jpg

https://lh4.googleusercontent.com/-X...218_225612.jpg

https://lh6.googleusercontent.com/-3...218_225616.jpg

[freakaftr8]

Re: Samsung PS42C450B1W Plasma Horizontal lines

not that it probably makes any difference but the panel that I "grenaded" was a Samsung 720p 50 inch PN50B450..

oh look at that she'll go nicely now

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Let it burn... let it burn......
https://www.youtube.com/watch?v=Bikl9-OPPmA

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Ok she's burnt but wasn't to spectacular...... Once an IC popped it just blacked out that section of screen, Uploading now, 22 mins long so will take a few mins..

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

I'm surprised you didn't start seeing some stuck lines. I think I need to try this myself sometime, get hold of a scrap panel...

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

I've a few lcds here that are scrap too.... any fun tricks you know for them?? ;-)

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Got a blowtorch?

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Small one yeah.. :-)

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

Maybe you can permanently fix a bad tab bond by removing it with the blowtorch. Cheapest reflow solution?

[Easky15]

Re: Samsung PS42C450B1W Plasma Horizontal lines

That doesnt really sound possible... Is it?? I thought tab bonds was unfixable.... Still uploading... :-o

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

That doesnt really sound possible... Is it?? I thought tab bonds was unfixable.... Still uploading... :-o

Fix... as in remove them... they can't be broken if they ain't connected any more!

Some guy on this forum suggested you could temporarily fix some of the older 1080p/100Hz panels that have tab drivers on both sides by pulling one side off... the idea is one driver can still do the whole panel but will overheat... removing the shorted driver will temporarily fix it. (The gate ones, left and right.) I have a Toshiba 37" with an LG 100Hz panel with bad side tab, never tried to fix it, might give it a go sometime.

[sessarhack]

Re: Samsung PS42C450B1W Plasma Horizontal lines

hi friend i have a hitachi plasma TV with the same problem, but i fix it, was the buffer card, or you replace it, or you fix it...how? you need apply heat to the buffer ic's no more than 220°c

[tom66]

Re: Samsung PS42C450B1W Plasma Horizontal lines

hi friend i have a hitachi plasma TV with the same problem, but i fix it, was the buffer card, or you replace it, or you fix it...how? you need apply heat to the buffer ic's no more than 220°c

This isn't a buffer IC issue. It's a well known issue on these Samsung panels - new buffer boards don't fix them. It is probably the glue bond where the ribbon meets the panel that is failing but that's near impossible to fix.

Would be interested in seeing more info regardng your fault though as I've not heard of Hitachis doing that..