Re: Samsung PS42C450B1W Plasma Horizontal lines
I must have done something wrong...
I must have done something wrong...
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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.)Last edited by tom66; 02-18-2015, 04:34 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Samsung PS42C450B1W Plasma Horizontal lines
Yes I had run a dead channel. Snow did it for me.Did I leave the soldering iron on?Comment
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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?Comment
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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.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Samsung PS42C450B1W Plasma Horizontal lines
yeah i am already playing normal tv on it..Comment
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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!Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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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.jpgComment
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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 nowLast edited by freakaftr8; 02-18-2015, 05:02 PM.Did I leave the soldering iron on?Comment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
Let it burn... let it burn......
https://www.youtube.com/watch?v=Bikl9-OPPmALast edited by tom66; 02-18-2015, 05:07 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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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..Comment
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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...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Samsung PS42C450B1W Plasma Horizontal lines
I've a few lcds here that are scrap too.... any fun tricks you know for them?? ;-)Comment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
Got a blowtorch?
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
Small one yeah.. :-)Comment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
Maybe you can permanently fix a bad tab bond by removing it with the blowtorch. Cheapest reflow solution?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Samsung PS42C450B1W Plasma Horizontal lines
That doesnt really sound possible... Is it?? I thought tab bonds was unfixable.... Still uploading... :-oComment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
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.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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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°cComment
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Re: Samsung PS42C450B1W Plasma Horizontal lines
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..Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Hi guys
I just started fixing 4k TV few months ago. so I am still learning a lot
I got this tv from friend complaint is ghosting or horizontal lines on image.
never saw the original symptom but I took the tv back home. the funny part is that after bringing to home, the tv worked fine no issue for 3 weeks.
then it started to show the ghosting white image.
I started using the tape method, but this tv does not have a T con board and it has only 1 ribbon cable from main board to the tv panel.
it has 3 thin small boards at the bottom of the... -
Hello,
First of all I'm new here. While looking I found this amazing forum and I'm very happy I did. Now for my problem:
I picked up a Samsung UHD QLED QE50Q67TAU from 2021 for $50 knowing it was defective. The seller said it had black lines and that it could get stuck in boot randomly.
I've tried a new power cable, hard reset, opening up and jiggling all cables, pressing everywhere to see if I get a reaction but I've gotten nothing. I've tried the tape method but I've only managed to get the lines worse.
I'm no expert but I've done the tape... -
I posted about this previously but didn't get any response, and I have some troubleshooted a bit so I have more info.
The screen is full of horizontal "gaps" or lines that distort the picture badly, and after about 10 seconds of powering it on the screen starts to fill with red vertical bars that take on the horizontal pattern. After the screen filled with the red bars, they instantly vanished and then slowly started to reappear. I initially thought it was tab bonding failure, but after getting down to them and pressing each one I find zero change in the picture. I went... -
hi guy my friend gives me this tv a 50tu8070u that has no picture at all, sound ok, backlights ok. i tought it was a bad panel, but the tv has many horizzontal lines green, i tried with the tape method but nothing change, only the green lines disappear but still no picture. You that have more good than me, do you think it s a panel or can be the main board, because my friend wants buy a new main board....but the tv respond to the remote control, have sound only no picture so i think it s a panel problem that is so broken that i cant fix with tape...or i wrong if someone can help me thanks, i give... -
I just acquired this 3D LED yesterday and it has horizontal lines on a little more than half of the screen. When I first turn it on it has thin black lines going across that makes the image look serrated, and then shortly after patterns of thicker red lines fade in. If I turn it off and right back on it will reset to just the black lines and the red will again fade onto the screen.
I initially thought tab bonds, but flexing the bezel makes no difference, and the fact the image sort of resets after cycling power is different. I haven't opened it up yet to actually test applying...
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