Question about Philips Magnavox 27MS343S 27" TV

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Single horizontal line

Hi i have a magnavox television console and it only displays a single horizontal line on the screen there is noise sound but it only displays a single horizontal line what can i do

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This problem is field collapse usually causd either by the field oscillator or field output stage to advise you further i would need to look at the circuit diagram

Posted on Feb 10, 2009

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My Magnavox plasma screen tv, model number: 42MF237S/37 makes a clicking sound when I try to turn it on. No sounds, no picture, just the clicking noise. Things I have tried so far: 1) Turning the TV off...


You either have a cold solder joint in your horizontal deflection circuits or your or in your horizontal output circuit. please be careful due to the fly-back transformer still holds power even unplugged until you discharge it.( ground it out). Hope this helps.

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Television


Hi,

From what I can understand, your problem is:
1. either a single horizontal line (from left to right), very bright, no picture but with sound, if yes then it is a failure of the vertical section. More often, it is the vertical IC that is at fault, sometimes the vertical capacitor. Still, in other cases, it is a case of cold solder; or
2. multiple lines across the screen with the picture overly bright and with sound. If yes to this one, then it is a matter of excessive screen voltage. This is adjustable using the HV Screen control that is at the rear of the Flyback Transformer.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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1 Answer

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Sounds like retrace lines. Leaky caps or worse can cause this.. Are you getting any vertical foldover at the top of the screen?

Jan 18, 2008 | Philips Magnavox 27MS343S 27" TV

3 Answers

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hi there, is the single line horizontally or vertically? if horizontal line, you do have a vertical section problem, check some parts at vertical section, the vertical ic, the power source of vertical section ie diode & resistors. ty

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1 Answer

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I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.

So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.

Best wishes,
SZ (Sydney, AUS)

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