Re: LG 60PX950 Plasma with almost no picture, but good audio
So I'm confused, is it the Y-sus or the buffer boards?
nadelman
NewMembrOldSoul
Last Activity: 02-24-2015, 12:04 PM
Joined: 11-01-2013
Location: Los Angeles, CA
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Re: LG 60PX950 Plasma with almost no picture, but good audio
I bought both the Y-sus and the two buffer boards at the same time from "The TV Parts guy" in Walnut,CA. ShopJimmy was out of stock.Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
Oh, one more thing when I tested my Y-sus and the vendor's buffer boards connected to the Y-sus, then Vy was 280 and VSC varied around 0-3vdc, so not quite the same as the other low/unstable readings I got when connected the Y-sus to the buffer boards.Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
So I tried all combinations of mine/vendors Y-sus and buffer boards. The net result was that whenever I connected the buffer boards (and one test with just the upper board) the voltages were low/unstable, and whenever I disconnected the buffer boards from the Y-sus the voltages returned to normal/semi-normal (semi-normal meaning 144-148 instead of 148-149 and 173-178 instead of 178-179).
So does that mean BOTH my and the new(vendor) buffer boards are shorted?Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
How do I isolate the buffers?Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
OK, put the vendor's Y-sus and my original buffers (u/l). Got the floating "no signal" box back, but it only blinks on for 100 msecs or so and then off for a second or two. Changed the input to the tuner, and got faint snow only in a pixel-thick image along the two sides pof the panel. Tested initially, and Vy and VSC were bouncing across 0. Then checked again, and they were stable at/near sticker values. But still flashing the bouncing box on screen.
Then I think I messed up. As I was testing the...Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
Thanks Tom. When I put the old Buffer boards in, should I use the vendor's YSUS or stick with my own (which is where I started)? I guess should I replace them one at a time? Can you suggest a protocol?Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
What does it mean if the Vy and VSC only test ok when the Ysus buffer boards are disconnected?Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
Is it possible that any of the Y-Sus or buffer boards are in fact, bad even though I replaced all 3 from a vendor? I decided to disconnect the buffer boards and low and behold, voltage appeared on Vy and VSC close to the sticker values. Interesting, though, was that while I was measuring, one of the probes slipped and a humming that I had been hearing, stopped. Then the voltage disappeared. I turned it off/on and the humming was back and the voltage was back/stable.
I then looked at the front and saw lots...Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
OK, I think I found something. The VSUS voltages are bouncing around. Vy jumps from 0 to 27 to -13, etc... VSC does the same also from 0 (mostly) to 24 to -13, etc. Checked Z-sus Vzb, and it looks good at 103.9. Sticker says 105.
Now here's something else I dont understand. When I first found the screen failure, the "No Signal" bouncing box would flash (although briefly, but would flash). Since Ive take it apart, it doesn't do that at all. Nothing on the screen. Nada. Bopkis.
Also,...Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
OK, here is a pic of the back. Will check other voltages next....Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
Oh, and all clicking of relays (?) all sounds normal, btw.Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
OK, voltages checked. Seem ok?: Sticker says Va: 60 Vs: 203; tested at Va 59.6-59.7 Vs 201. 5v also at 5.1v. Oh, and for some reason I thought the hi voltages in a TV were AC, but DMM wouldn't register until I put it on DC. :0 Just shows how much I know! Oops.
CTRL board green led was blinking 3 short, 1 long, but then changed to 1 long/1 short twice then a 4 sec delay and repeated.Leave a comment:
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Re: LG 60PX950 Plasma with almost no picture, but good audio
Oh, one more thing, I did check all the fuses (from Tom's troubleshooting guide) and they're all good. Will check voltages and report back...Leave a comment:
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LG 60PX950 Plasma with almost no picture, but good audio
I have a 34 month-old 60" plasma that one day stopped displaying a picture. Since it was tuned to a live input I could hear the audio perfectly. Actually, the picture was dark except for the floating "No Signal" box that was extremely intermittent in flashing on the screen. Like it would flash on for maybe 2/10 of a second then nothing for 5 seconds then again, flash for 2/10ths. Also some white sparklies (?) in a line at the very top of the screen. Almost like a digital signal blinking in spots on/off.
Reading threads here led me to believe it was the YSUS and seeing... -
Re: New Members - please post your introductions here
Hey Guys;
Old guy here. Been playing with computers since the PDP 11/70 and Altair/IMSAI brands were king! Now I am just a hobbyist who burns himself with the soldering iron cause I don't get to play with it that often
Found this site in an attempt to find a repair for my 2.5 YO LG Plasma. Sheesh, these things are supposed to last more than that, right!??!?
Hope to meet some cool peeps here. Seems like a good group o guys. Happy belated Halloween.Leave a comment:
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