Re: Testing the PDP idea. Will it work?
Thank you so much for all your help!
Skipfinder
Member
Last Activity: 11-14-2013, 12:23 AM
Joined: 10-17-2013
Location: Kennewick, WA
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Re: Testing the PDP idea. Will it work?
I bought it that way after carefully questioning the original owner. Hard to say whether she lied or the screen glass just failed due to heat cycling and design flaw.Leave a comment:
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Re: Testing the PDP idea. Will it work?
Just wanted to say thank you for all of your help and knowledge!
I found the problem to be a cracked screen under the surround. It ran vertically along the Y side of the screen. It wasn't noticeable with the surround in place.Leave a comment:
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What causes PDP failure?
Besides the obvious cracked screen, what causes a plasma display panel to fail?
And yes, I'm curious about failure modes of the panel itself. -
Re: Testing the PDP idea. Will it work?
Yes, I got activity in the dead areas. I don't have the schematics for this TV so maybe someone can tell me if the y-buffer outputs to the PDP ribbon cables are identical, i.e., is each ribbon cable pin-out config the same?Last edited by Skipfinder; 10-24-2013, 11:29 PM.Leave a comment:
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Re: Samsung UN46D6420 Horizontal lines, now No Picture
How can the panel be bad if it's possible to get half the screen to display normally? Doesn't that speak of a signal to screen error?Leave a comment:
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Re: Testing the PDP idea. Will it work?
Damn. The logic board test failed to light up the whole screen. I still had the black screen in the same place. I checked the ribbon cable between the logic and Ymain boards for continuity and shorts and all was OK. I wish I had a complete schematic!
Also checked the pixels as per Freakaftr8 and they are all the same.
I'm thinking that trying a new logic board is worth the $25 risk. What do you guys think?Leave a comment:
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Re: Testing the PDP idea. Will it work?
Thank you Tom, I'll let you know. Fingers crossed!Leave a comment:
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Re: Testing the PDP idea. Will it work?
[attach]73134[/attach]...Leave a comment:
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Re: Testing the PDP idea. Will it work?
The LVDS cable should be a twisted pair cable, right? I don't remember seeing one but I'll take a look when I get back to the set. Regardless, it should connect the power supply and main board?
The Samsung Fast Track guide for the PN50C490B3DXZA says that I also have to jumper the PS-On pin to its circuit ground. I'm thinking that it must be a 15Vamp circuit.Leave a comment:
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Re: Testing the PDP idea. Will it work?
Do the ribbons come off the PDP? I figured that they were integral. If they come off I'm willing to try anything. I put the known good signal to a dead section. It didn't work, but I DID get some random screen activity and the faint glow of power in the dead section. It gives me hope that the screen is OK.
And yes, I replaced both the Y main and the Y buffer (it's all one buffer board) at the same time and verified the voltages to and on the board were correct....Leave a comment:
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Re: Testing the PDP idea. Will it work?
I'll look at the pixels tomorrow and let you know. Thanks Freakafter8.Last edited by Skipfinder; 10-23-2013, 09:42 PM.Leave a comment:
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Re: Testing the PDP idea. Will it work?
Well, that was anticlimactic. I suspect that the outputs to the buffer ribbon connectors aren't all the same, because I didn't get an image further up the screen like I'd hoped to see. I did however get random lines across the screen area that was formerly completely black, so that gives me hope that the PDP isn't damaged. I'm starting to wonder if the main board isn't outputting a complete image, if that's even possible.Last edited by Skipfinder; 10-23-2013, 06:52 PM.Leave a comment:
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Re: Testing the PDP idea. Will it work?
I've got nothing to lose at this point. I'll let everybody know how it turns out.Leave a comment:
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Re: Testing the PDP idea. Will it work?
No cracks in the screen and no noise from the screen. It hasn't been moved since the day it was brought home.Leave a comment:
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Re: Testing the PDP idea. Will it work?
The bottom of the screen is clear and normal. The top the screen is displaying on every other line. Everything else is dark.
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[ATTACH]73077[/ATTACH]Re: Testing the PDP idea. Will it work?
The bottom of the screen is clear and normal. The top the screen is displaying on every other line. Everything else is dark.
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[ATTACH]73077[/ATTACH]Re: Testing the...Leave a comment:
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Re: Testing the PDP idea. Will it work?
I guess it's possible that the new buffer board has the same bad chips as the one I replaced, but it isn't likely. The new Y main and buffer boards are factory fresh from ShopJimmy, and the exact same symptoms remain. I replaced them as a pair and verified that the voltages are in spec.
I have the bottom 1/6th of the screen working normally, and about 2" of the top of the screen working on every other line. The edges of the black area are clean and square. I've tried different inputs on the main board to no avail. The logic...Last edited by Skipfinder; 10-23-2013, 12:16 PM.Leave a comment:
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Testing the PDP idea. Will it work?
Samsung PN50C490B3DXZA
I have only the bottom 1/6th of the screen functioning even after replacing the Y Main and buffer boards. I'm thinking that before I throw any more money at this set that I'd like to verify that the PDP isn't bad. All voltages are good.
Here's my idea:
Remove both Y boards from the chassis but provide solid grounds from the boards to the chassis. Move the 6 buffer ribbons up one position, leaving the top ribbon disconnected and no input to the bottom of the screen. I know the bottom ribbon is providing good signal to the PDP. If the image moves... -
Re: New Members - please post your introductions here
Hello All, I've been lurking about in here to try to fix a Samsung PN50C490B3DXZA 50" plasma. The damned thing is only two years old!
There is an incredible amount of info in here and I think my brain may explode. These forums rock!
Thanks so much,
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