Re: Plasma turns on, but shows no picture
Yeah, that's the article I've read, but I can't find the jumpers to be shortened on my board.
I was thinking of the mainboard, because of the fact, that the TV wouldn't wake up from standby after it's in there for a while (have to pull the power plug) and the fact that it gives a screwed up picture on some VGA and RGB-Scart sources. Though the 2nd issue could just be a low cost, incompatible internal upscaler...
Daysleeper
Member
Last Activity: 08-12-2013, 03:28 AM
Joined: 08-06-2013
Location: Frankfurt
-
Last edited by Daysleeper; 08-10-2013, 04:01 AM. -
Re: Plasma turns on, but shows no picture
So, I better leave it alone.
Since the menu-options have an effect on the "pixel-swarms" I came to thinking that the mainboard might be the reason.
I read an article by you bout some selftest for the controle board, but I don't know the jumper points for my board. Would you have a look?
I know it's a very bad photo, but maybe something looks familiar......Last edited by Daysleeper; 08-10-2013, 02:49 AM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
There is actually a third screw on some kind of extra-board, labeled YR5901 (the other both are YR5000 and Y5001). I didn't touch it yet, since I don't know what it does. Do you think I should also try this screw?Leave a comment:
-
Re: Plasma turns on, but shows no picture
I did try both directions but most screws can basically only be turned right, turning left they physically hit their "limit" and can't be turned any further.
So all I can do is increasing (turning right). In the case of Vfr the picture goes very noisy at some point.
Changing the menu-options for contrast, brightness, saturation, etc. causes those pixel areas to change their position on screen, but I can't make them go
Last edited by Daysleeper; 08-09-2013, 03:35 PM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
There is not much, that I could lower, since most screws are already very close to the left. Turning Yrr and Yfr doesn't let even one of those pixels vanish. No effect on them.
Playing a game I noticed them in the upper area around faces when there's movement on screen. Not very annoying but noticeable...Leave a comment:
-
Re: Plasma turns on, but shows no picture
First I lowered Vset from 190 to 180 and watched if anything changed. Then I turned YFR. Then I set Vscan from -190 to -180, watched, turned YFR. Nothing. Then Vset back to 190, once more YFR, nothing.
I suppose it's YFR cause it's not labeled. Turning it up very high produces lot's of noise. Still think it's the right one. The only other screw on the board is labeled YRR.
Gotta run now. Will give it another try when I'm back home, but I really don't think it'll work.Last edited by Daysleeper; 08-09-2013, 11:43 AM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
Doesn't seem to have any effect on it all
Leave a comment:
-
Re: Plasma turns on, but shows no picture
I better ask. What do you mean by Yfr (rotate)? 180° or just try it out?Leave a comment:
-
Re: Plasma turns on, but shows no picture
Well, positive then I guess then. They just jave the wrong color, yellow instead of light blue. On dark blue background or black for example they're not visible at all.
They seem to go on and off very quickly but basically staying in the same place....Last edited by Daysleeper; 08-09-2013, 10:36 AM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
Actually I started to mistrust it either. I now unplugged the Y-Main and X-Main and it measures much lower values...
Changed the battery of my multimeter. Now it gives me the correct values. The flicker is almost gone.
Unfortunately the two small areas of noisy (yellow) pixels remain. Though they are only visable on light blue background. When the background color changes, they're completely gone.Last edited by Daysleeper; 08-09-2013, 09:32 AM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
Found them on the y-main, but didn't change anything.
I lowered all of them VS, Vset, Vscan, Ve (and Va) cause they were all to high. But they all raised the voltages automatically from all alone (10 -20v higher). So turning the screws did not work at all plus I can't turn them any further.
The flicker is not there when I have connected the PS3 but I have some disortions on the bottom of the screen (colored, moving pixels). It got worse, when I altered Va, so i turned it back... But still this "noise"......Leave a comment:
-
Re: Plasma turns on, but shows no picture
I lowered all the values a few volts until they matched the sticker, but they seem to raise up again afterwards from alone. And the flicker got worse...
For VS and Vset I cannot turn even turn the screw any further, though they're still 10-20 volts to high...
What do you mean by Yrr and Yfr? I can only find on more screw labeled VPFC.Last edited by Daysleeper; 08-09-2013, 07:17 AM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
Feedback:
It works again!!
I replaced the z-diodes and the picture is there again.
Thanks for all of your help, especially capkid for pointing out that Dell issue. I would have never figuered that out on my own.
I only noticed a flickering on the screen unfortunately when there is no signal (blue screen). When a signal is recieved, it doesn't seem to be there. Have to do some more testing later on. I couldn't buy z-diodes with the same part number, only with the same values (30v,...Leave a comment:
-
Re: Plasma turns on, but shows no picture
Oh, you were referring to the zdiodes as the "cheap" parts! Sorry, it's late. For some reason I was thinking of them like fuses, which usually don't blow without a cause.
Then I'll replace them and post back results
Thanx alot!Leave a comment:
-
Re: Plasma turns on, but shows no picture
Okay. So you think the PSU is faulty and caused a peak that fried the diodes?
When I turn on my soldering iron this causes my external VGA-Upscaler-Board to produce a flickering picture while it's on. The TV (when it still worked) did the same, so I could not use the upscaler with that TV. Stuff like this makes me think the power-net here is a bit troublesome...Last edited by Daysleeper; 08-07-2013, 04:20 PM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
Does this mean I should continue checking on other parts before replacing the zdiodes? The power supply seems to be okay.
Then again, the power-lines in the house I'm living are... well gently spoken... of lower quality. I'm getting some nice sparks every now and then when I put a plug into the wall. Maybe those fluktuations in the power-net caused the diodes to die??Leave a comment:
-
Re: Plasma turns on, but shows no picture
Jepp, this seems to be the same issue. I just measured the zdiodes on the lower side and they all seem to be faulty, the ones on the upper side should be okay. Gonna buy some replacement zdiodes by tomorrow. Hopefully it works
If it does, the question remains what caused them to break. A too high voltage from the PSU??Leave a comment:
-
Re: Plasma turns on, but shows no picture
Hi! Thanks.
Well this could actually be the hint I was looking for. Searching for Dell W5001CHD on youtube brought up this video:
[url]https://www.youtube.com/watch?v=xcIuAhSCBjM[/url]
I already noticed that something might be wrong with those zener diodes, but wasn't entirely sure about it. I'll replace them and post then back!Re: Plasma turns on, but shows no pi... Dell W5001CHDLeave a comment:
-
Re: Plasma turns on, but shows no picture
Hello, thanx for the links. I watched the first video before, but it didn't help me with my problem. There seems to be a bulged cap and a blown fuse the cause.
Sorry, but I don't know what you mean by post 6. If I follow that second link and go down to the 6th post, it shows a set of videos but none seems to deal with my problem.
Could you probably be a bit more specific?
I noticed that two of the fuses on the Y-Main have a resistance of 5 ohm's. Isn't that a bit to high or still okay?? Read in some...Last edited by Daysleeper; 08-07-2013, 02:19 PM.Leave a comment:
-
Re: Plasma turns on, but shows no picture
What I forgot to mention: The TV seems to have problems to wake up from standy sometimes, meaning the pushing the power button would not turn it on. Had to unplug the power completely, then it worked again. It also did that when it was still working.
Could it just be a software issue? Is there a way to reset the TV?Leave a comment:
No activity results to display
Leave a comment: