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Equipment Repairs => PLASMA TV forum => Topic started by: tv tony on April 06, 2019,16:55:04
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Hello All,
I am a moderator on the forum but due to illness I'm not as able to come on as often. Anyway, I have an LG 42PS3000 in. As usual no picture, Vs and Va ok, found a s\c cap and o\c resistor on y-sus. These feed and decouple voltages for the buffers. Now I have perfect lower picture but the top is modulated but grossly overbright. Can the y-sus board be the cause, I would have thought that as the lower part is perfect the y-sus is likely to be ok. I'm going for the buffer pcb. Who is with me on this one, is any old fellow techies I used to converse with on here still around. Ta anyone?
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HI tony,
I agree with your reasoning. As the Y-Sus is generating a picture, it's probably OK. Don't forget test patterns as well, though unlikely to make
any conclusions from it.
I like a man who uses Spellcheck. Bruce
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Ta Bruce, I've seen a lot of your posts. I used to be on the site a lot. In the days when LCD\PLASMA was in it's infancy. Thanks for your comment re. spelling. It used to hack me off when people can't even get the model number right. I've got dementia now but I still try, I play Scrabble a lot on-line and love playing you lot over there.
Cheers re. the tv, it belongs to one of the people at my care home, I'll go for the buffer, thanks Bruce.
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Not yet at the dementia stage. Cryptic crosswords for me, although the Guardian one is so cryptic, I suspect the compiler might have dementia,
or a wicked sense of humour. Bruce
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Truly wonderful, but sad Tony now has issues - Chris.
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Hello Chris, stranger, are you alright? I'm batting on. Thanks for your comment, just this damn set. I don't take much on now. This set belongs to one of the care workers. Does it sound like the buffer to you? Never had one where the y-sus board is faulty yet the set is perfect in the bottom half. The top half of the picture is there but grossly over bright and there is a definite separation between the two.
I'll tell you what, this site has altered, so many new faces. I heard Doug passed away from Millom, Cumbria. Met him a few times. He used to bring problem sets to me. Glad you're still on here. Take care. Tony
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Welcome back Tony,even to me it seems a buffer issue
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Hello Michael, nice to be remembered, you OK? Yes, this set belongs to my care centre. Should have kept my mouth shut regarding it. Heavy beggars aren't they? I'm reckoning that as the ysus is providing half a picture it's alright. Yet the top is showing except for the excessive brightness. And it's a sudden change from dark to light, if I sort it I'm applying for an extra bed bath! My only reason for doubting it is the buffer is each section of the upper picture is present, which suggests to me all the chips are ok. And that's really all there is on the buffer. Same as Chris has said it's likely to be the buffer. The y-sus on these are reliable, saying that it was faulty. The feed resistor to the buffers was O\C and the decoupling cap was leaky. The buffer is cheaper so I'll try it, thanks again for your comment. Take care, Tony Walker
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Thank you Tony,take care of you too !I hope to hear of you soon
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Couldn't find anything wrong on the buffer, there were no lines missing, just excessive brightness in the top section of the picture. Thought I'd through a buffer at it, I'd repaired the ysus, picture restored. Cheers all of you.