Question about Philips 28PW6506 28" TV

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Philips 28PW6332 28" TV

Picture collapsed to a thin vertical line about half an inch wide, Turned set off then back on after a few minutes - no picture at all, sound still ok. (Model number on label is 28PW6332/05, purchased Jan 2000)

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Re: Philips 28PW6332 28" TV

Simple problem. In all likelihood, The Vertical Output IC has failed. It will be TDA 8177. Replace. Or, it could also be that the Supply to that IC has failed. Unless you are competent in Solid State repairs, do not try this by yourself. get a professional Technician to have a look.IC should not cost more than 15-20$ pluch Tecnician fees.

Posted on Aug 21, 2006

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Toshiba Model 53HX71: Bottom half of screen and sound is fine; top half of screen has collapsed to a horizontal line in the middle of the screen. Repairman I spoke to briefly said it probably won't be...

Your TV has vertcal scanning problem. All picture tube based TVs have, both vertical and horizontal scan to spread the picture to entire screen. When vertical scan section meets with a fault, the picture will collapse horizontally and fi horizontal scan section has a troubl, picture will collapse vertically. Your TV s fault , we technically say, to be vertical foldover. This is due to the vertical output section, a circuit part, inside the circuit board of your TV.
To rectify this fault you must open your TV. Unplugh it from the power socket, and open it. Locate the vertical output section, which is easy to do. Look at the deflection yoke, the coil fitted on the neck of the picture tube, and you will see four wires from it going to the main circuit board. Out of which, two will be thick, normally red and blue in colour, connected to the opposite direction on the deflection yoke, and the other two will be thin. follow the two thin wires, said later, and you will reach to a plug in point on the printed circuit board.
Before doing anything, just look at the soldering of that section carefully for any loose soldering, or bad soldering. Usually, the components in the vertical output section will get heated during working, and ahve a cahnce to get loose contacted soldering joints. Just resolder all the suspected points by applying a little more solder, and see the effect. If thi doesn't help, check the IC used in that section for trouble. Some capacitors will be there in this section, will get dried as aging, replace them first, as they are ver few in numbers, When replacing capacitors, note their polarity, as electrolytic capacitors have both positive and negative terminals like torch cells. Before replacing the vertical IC, replace all the capacitors, especially, two or three large capacitors on that section. Just do these and if you want any more assistance feel free to contact me through Fixya. OK

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Picture appears only as a thin, horizontal line...

chk vertical amp /vertical drive i/p from oscillator/power to it/power to vertical amp/chk dry joints-hot area/look at vertcal amp capacitors-swelling etc

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If the thin white line you mention is crossing the screen from left to right, your tv is experiencing what is called "vertical collapse". That is a very common problem that is repairable and may be as simple as a few solder connections to replacement of the vertical output IC and a few capacitors. If you can find a qualified shop, take it in and it shouldn't cost much more than $100 to get it fixed.

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civilman, the first set has either no high voltage or is collapsed vertically, until someone checks for high voltage there is no concrete answer, the AV27730 is vertical collapse from your description, either the voltage to the vertical IC is missing or the vertical IC has failed, not a big deal cost-wise, hope this answers your questions, if not e-mail me back, good luck, BMW Rider

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Hi Shailendrar , your problem sounds like vertical collapse , the whole picture has collapsed into a thin , very bright centre line ? maybe the result of dry solder joints , does banging on the side of the tv temporarily fix ? if so , the circuit board requires inspection for bad solder joints . Alternately the vertical chip/transistor may be blown , replace as required. Cheers T

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I think that vertical deplection IC of you tv set is shorted. Please check also the YOKE of the unit, its maybe grounded.

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You have a bad connection on the CRT board thats mounted on the end of the picture tube it sounds like, or the socket on that board that plugs into the TV set is intermittant or has a bad solder connection on it. Good Luck

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