I repaired the Y and Z sustain boards yesterday. Replaced some IGBTs, Diodes, ICs, and transistors. Got it working and the picture looks great, but at the top I can occasionally see scan lines. I was unable to get a picture of it. It seems like it happens when there's fast motion on the screen. What it looks like is someone split the image horizontally and didn't line it up right when putting it back together. Maybe it's just Netflix. I'll try to find another source.
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Re: LG 60PV250 scan lines on fast motion.
See it on the bottom on my Netflix. Like the last inch sometimes. Hopefully that's all it isDid I leave the soldering iron on? -
Re: LG 60PV250 scan lines on fast motion.
I see it on YouTube too. My girl has all my DVDs. I'm going to find an HD movie and burn one. I have basic cable and seems normal, but can't find a damn HD channel.------------signature starts here------------
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Re: LG 60PV250 scan lines on fast motion.
In bed watching Netflix on my Roku stick and I'm like, damn I can just plug the Roku into it. Picture seems perfect. I was using my tower at first and that has a lot going on (Tomcat server, mysql, up to 18 threads almost continuously sending or receiving over the network). No clue how good the graphics card is either. I think I'll let this go tomorrow.------------signature starts here------------
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Re: LG 60PV250 scan lines on fast motion.
You might be seeing dynamic false contouring. Pictures look like an oil painting, but only during movement.
It is caused by the subfield drive, and some sets are worse, especially if they are displaying bright content because the subfields are very short when the screen is bright.
There is no way to fix it because it's a fundamental consequence of the way a plasma panel is driven.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: LG 60PV250 scan lines on fast motion.
Yes, I do occasionally see that------------signature starts here------------
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Re: LG 60PV250 scan lines on fast motion.
BTW, you can blame your brain for dynamic false contouring.
If you try to film a plasma panel (correctly) using a camera, it will NOT pick up DFC. DFC is a result of how your eyes and brain process motion. When bright pulses of light appear (subfields), they are compensated for movement on the screen by the micro-saccades that your eyes do during movement. As a result, they appear to be frozen in time, when they should be moving. So you see contours on moving objects - the frozen subfields ...
The only way to significantly reduce it is to use something similar to Pioneer's C.L.E.A.R. drive, which uses many more subfields (28 subfields versus 10) and each subfield is additively built up. So the panel only ever has MORE pixels set in each subfield. This significantly reduces the number of possible codes that a pixel can occupy.
If you think about it, if you can only ever have more pixels lit in each field, then each pixel can only be: 1, or 1+2, or 1+2+3, or 1+2+...+N... so there are 28 total intensity levels. Only 28! Not enough to render 255 intensity levels (or 1023, or whatever). So the panel has to use a massive amount of dithering to compensate for this.
This is compared to a traditional 10 subfield drive with non-sequential pixels, so there are at least 1024 possible levels, which are then expanded with a small amount of dithering.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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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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All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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Hello, I have a screen in where sometimes when I open it pop-up vertical multicolor lines (I would say the most of them are green). If I tun off and turn on the screen the lines dissapear or if I leave open the screen after approximately five minutes the lines gone. I measured the below voltages on the main PCB and on the T-CON board and the voltages are the same when it doesnβt display the vertical lines and when it displays the vertical lines. Also, I cleaned all the connectors very good with IPA. I moved back and forth the connectors and the COF tabs but the vertical lines didn't displayed... -
Hi all
I have lines on the screen...which is an age old problem that can be remedied by watching Youtube videos and getting out the tape.
My issue (after successfully fixing a different sammy tv with a separate tcon board and isolating the side of the panel...):
This tv has an integrated tcon...so it is a bit more confusing when trying to isolate the clocks.
It has a c ribbon and i have taken each end out to see if that will isolate the lines. instead, it makes it much worse ALL over the tv!
So....i don't know what end of the C ribbon to work with... -
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... -
FAST MODE vs NORMAL MODE
I have recently acquired a HP 6632A DC power supply. I am just beginning to use it and I have been reading the manuals for it. It is the first power supply I have ever owned or used. I am a very beginner hobbyist and do not have an engineering background, as may be obvious by my question...
I can't seem to understand what the actual use is for the 'Fast Mode' or the 'Normal Mode' on the power supply. Although the manual states what the two modes do from a engineering/technical standpoint, I don't know enough to understand what it all means,...
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