Question about Philips 32PT5441/37 32" TV

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There is a band developing

The band is developing across both the top and bottom of the screen. This happened over a year ago, where the tech replacrd some capicatators, and repaired the printed circuit board. Cost was over 200 bucks then--The TV 2 yrs , 9 mo old. Should we junk it-- or is there any better way to handle it ? Thanks

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Re: There is a band developing

The band is developing across both the top and bottom of the screen it is called cinemascope picture. it is a vertical failure. it is not a major problem. it is on you accrding to cost of repair. it is due to less supply or part failure in vertical section.

Posted on Sep 25, 2007

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Disney princess tv suddenly narrowed the visible part of the screen. Now everything is squished into a two in wide band with all the rest of the screen is black.

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Black box on screen

Without a picture of it it's hard to say what you mean. Sometimes on a CRT TV the vertical scan doesn't fill the screen, but that would cause a black band both top and bottom. The usual cause is a capacitor drying out. But only a qualified tech should look into that.

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Wavy horizontal lines across the screen

It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

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Toshiba CF2772B New in 1992. Has black band across the bottom

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The vertical circuit is not pulling the top of the picture to the top of the screen (CRT) correctly. Its possible you have a loose wire or device ( after moving ) . If you have vertical agustments on the back , you may be able to adjust the picture taller; if the picture becomes stretched ( non - linear ) then you definately have tv tech only problems. At that point I'd really think twice about a repair and consider a new DTV or HDTV set. If the unit was damaged by a mover , then you may have a claim against them .

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2 Answers

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Your whole problem my freind is dryed up capacitors. You should go, if you have the technical ability to replace these capacitors, to, download the schematic diagram, and start replacing the waveshaper capacitors in the vertical drive circuit.

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