Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Which board would those test points be on? I'm not finding anything with those labels. There are points next to the various connectors feeding in to the y sustain - I've attach photos of the y sustain board. The overall can't be blown up enough to read the silkscreen, so I've outlined where the detail shots came from.
I've kind of got the bit between my teeth now in wanting to ID the root cause.
Thanks for sticking with me through this....
ttraband
Member
Last Activity: 03-31-2018, 07:02 PM
Joined: 02-16-2018
Location: Sun Prairie, WI
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Just put in another pair of buffers (off eBay) and still have the same red screen. I'm starting to believe its not (or not just) the buffers. This latest set gives me 2 (or maybe 3) black horizontal lines, one about mid-screen and 1 bolder (or 2 adjacent) lower down.
Seems like the upper connector on the y-sustain itself may be shorted. I've got continuity between all the upper connectors I can test from the front of the board until the lowest 3 pins.
Any suggestions of components or points on...Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
I don't know what caused the change, but Vs and Vscan are now steady. I'll see about ohms testing the buffer boards in the next couple of days and post my results.
I'm considering looking at eBay for another set of buffer boards, but I'm concerned that if there's an issue with the Y sustain, that may just damage the new (to me) buffers. Is there a way to evaluate the health of the Y sustain?Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Sorry to be late getting back to you. Stepped away from this project for a few days.
With the upper buffer removed completely from the tv, the bottom half of the screen still shows red snow, but with a blacker background, if that makes any sense. I'll try to upload a picture to go along....Last edited by ttraband; 03-06-2018, 10:19 PM.Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Sure enough, the eBay listing says it came from a set with a broken screen.
I may try again, but this time I'll pick a seller who takes returns.Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Well, (with power off) I disconnected the ribbon cable to the Y sustain and after powering up the Vs was stable. Then (again with power off) I reconnected the ribbon cable and now the Vs is still stable. I've dialed-in the various voltages to be right at spec and I'll let the set run for a while to see if they change with temperature.
Is there a way to test the buffer boards more comprehensively? I'm willing to try transplanting components if that would have any chance of success.
I've checked ShopJimmy.com...Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Okay. Tried to get some measurements tonight, and realized I wasn't sure which blue capacitors I was to be testing, on the big Y board or on the buffers. Re-reading your instructions, it looked like the ones on the buffers, so that's what I've measured, with power to the TV disconnected.
The larger blue capacitors (outlined in blue in attached images) on the buffers all read around 670K ohms. (I re-checked these after the mistake below and they hadn't changed). Smaller ones (outlined in green) read about 4K ohm....Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
No time last night either. Should get some time this afternoon and evening. How long should the set "warm up" before measuring/adjusting the various voltages? Is there a particular part that should get to a steady temp? I've been looking for an excuse to put the IR thermometer I got for Christmas to good use.
Thanks again!Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Sorry, life got complicated last night and I didn't get the testing done. I'll try again tonight.
I don't recall the reading off the top of my head, but I did test Ve on the X board and it matched the label.
I've seen the C102 threads. It seemed like most of them dealt with power cycling issues, but I'll take another look at the threads.Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Swapped the buffer boards last night and got the same red pattern, only for half the screen at a time, but didn't have time to test the blue capacitors. I'll take a photo of the Y sustain board tonight and annotate it with the capacitor readings.
Thanks again for your help.Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Thanks for the clarification. I'll try this out tonight and post my results.
I realize that this is the next step (after isolating the buffer boards), so for the blue capacitors, do I just check continuity through their leads to see if they're shorted, or am I looking for continuity between them and ground?Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Thanks for your help. I just want to be sure I'm understanding the instruction.
When you say "top buffer connected to Y board only" do you mean I should remove the lower Y buffer board completely? I'm assuming I leave the ribbon cables connected to the upper buffer board when running this test.Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Here are photos. Let me know if others would be helpful.
First is during power-up, mostly black screen with bands of blue/green pixels. (Sorry for the reflection of me and our family room)
Second is "normal" with no input. The antenna connection and blu-ray are back in their regular homes, but this is representative of what they looked like.
Third is with menu displayed.
Fourth is blown chip on buffer. On the upper buffer board, the third from the top, and...Leave a comment:
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Re: 50" Samsung pn50a510p3fxza Plasma - Red Screen
Thanks for the quick reply. Sorry that I got the board names crossed. I'll post pictures after work, or maybe at lunch if I can run home.Leave a comment:
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50" Samsung pn50a510p3fxza Plasma - Red Screen
I've picked up a freebie Samsung pn50a510p3fxza off of craigslist that I'd like to try and resuscitate. It was known to have blown chips on the Y Sustain board. When I pulled the back off of the set, sure enough 2 of the square chips on the Y sustain upper were melted, obviously blown in what looks like a pretty catastrophic event. Original owner described smoke, and I believe him.
Since this was a known issue, I didn't try to power on the set when I first received it (assuming there'd be no picture). I've gotten a replacement remote and upper and lower Y sustain boards off of ebay... -
Re: New Members - please post your introductions here
I'm Tom and I've been playing with/working with electronics since sorting resistors for my dad while he built a 25" color Heatkit television back in the 1970's.
Latest project is a "gifted" 50" samsung plasma with display issues. Hoping to find pointers to get the red haze picture cleared out.Leave a comment:
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