The picture on my Advent TV HT2751A is curving inwards.
My 27" Advent TV HT2751A is having issues. We were watching it fine this morning, then we put in a DVD and the vertical edges are now concaving in. The left side is less prominent than the right, but both sides are definitely going. The effected area is just pure black. The picture in the center does not seem to be changed. We love this TV, and while it isn't a flat panel tv (it is a flat screen), it has MUCH better picture than any flat panel being sold out there. We would really love to save this television if possible.
I also have the exact same problem with my Advent HT2751A which only started recently, so it makes me wonder if we purchased our TV's around the same time (12/04). I don't know if it's related but my TV is also experiencing a problem where it needs to "warm up" for several minutes (perhaps as many as ten) before the picture comes in. For the first few second the TV goes through a series of flashing green lines all over the screen, then settles down into a blue screen until the picture flickers into view.
I would like to think the two problems are linked, but the warm up problem has been there for almost a year now, and the "inward curve" is a new problem.
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This is the best solution for your problem as a 40 year experience with wires etc.
Go to the source of your cable signal connector .
Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires.
You have a bad capacitor off the vertical output I.C..Find the pin off the I.C. that represents the out of the I.C. If you have a capacitor checker, you can check the ESR(equivalant series resistance) to see if it reads high.Look on the internet for a schematic,this will show which pin of the vertical I.C. is output,and the cap. that leads off it..
I don't have schematics of this particular tv but I would try to help you to diagnose and rectify this problem. I think that your tv has problem of pin cushion, incorrect picture size at sides, this is cause of few defective parts in Pin Amp area. I need few clear and focused pictures of both sides of TV main board to see what part is damaged. Thank you.
After 3 years, I finally decided to open up the TV and do some troubleshooting. Found out the problem, It was a blown capacitor Location C554 Capacitor value is 2200uF 16V - costs about a dollar to replace yourself and the TV works brand new.
Have you had any kind of magnets close to the tv set? I had a brand new sanyo do the same thing. I had pulled the speaker box out of my truck and stood it up next to the tv (not thinking about where I put it). Turned it on a few hours later only to see a messed up picture. I moved the speaker box to get behind the tv and the picture got better. Moved the speaker box back to the truck and after a couple of days the picture was back to normal. These were 4 large magnets on these speakers. Maybe I helped some!