Question about Toshiba 27A33 27" TV

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Only see a slice of picture + bright horizontal band

I get a bright horizontal band plus what looks like a more-or-less properly proportioned, 2" high section of the picture directly below the band. It looks like I'm seeing a narrow window of the entire picture. Color and sound are fine as is the small section of the picture that is visable. The window I see is a tad short in width, but otherwise OK. I have already replaced the vertical IC (Sanyo LA78041) and the 2SD2499 transistor on the same heat sink, which had no effect on the problem. My next step is to check all the related vertical caps around the circuit. Any other suggestions?

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  • Charlie Talbott Apr 30, 2007

    Techman. Thanks for the advice on the two small caps. Could you please be a little more specific as to which ones? I've already checked about half the various ceramic and electrolytic caps in the vertical circuit and haven't found any bad ones yet. Unfortunatey, I don't have a schematic of the set, so I'm starting out at a disadvantage, but I feel there's only so many components in the vertical circuit.

    One more related question. I have completely removed the main circuit board. Is there a way to power up the board without energizing the High Voltage? That way, I cound more easily use a scope to poke around the board. I'm a bit gun shy of trying that with the set on now. (Yes, I know about isolating the ground lead. I used to work with 3 phase 480VAC/600 Amp SCR circuits.)

  • Charlie Talbott May 01, 2007

    I'm starting to feel really stupid about now. What exactly is the Y/c IC?

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Usually the 47 to a 100 mfd electrolytic capacitor although rarely the 1000 mfd 50 volt generally in and around the vertical output chip also just checking these capacitors may not reveal the defect so many times they may test good when they are bad the best way use substitution with jumper leads connect test shut off set go to next suspect turn set on .continue this you may find culpert.

Posted on May 02, 2007

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There are two small capacitors that need to be changed in the vertical circuit.

Posted on Apr 28, 2007

  • Anonymous Apr 30, 2007

    The capacitors should be by the Y/c IC and might be the black and red ones

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You could do three of these change flyback change yoke change cap that couple the horizontal transistor.good luck

Posted on Apr 28, 2007

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No light or picture. only sound and the screen is dark.


Two probable points; either the loss of the service voltage for the high voltage section or a failure in that section.
The circuit that produces the high voltage for electron beam acceleration also produces the sweep for the horizontal movement of the beam, in other words, if this circuit fails or the voltage it needs to operate is gone, no picture, but the audio still functions.
Because of its Chinese origins, there is a chance that critical specialized parts may still be available for it or, if you are lucky to have a tech competent to repair standard TVs, he may find a less critical part that has failed and readily available.

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Why did my picture become big so I can not see the sideline information


Press the RATIO button repeatedly to select the desired picture format. You can also adjust Aspect Ratio in the OPTION menu.
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Ps 27123 have sound, tuning etc only small horizontal color band


Hello bdedrick708,

If what you are trying to say is that you have a 1/4 inch horizontal line across your screen, this means that something in your vertical deflection circuit has failed. This could be the vertical oscillator, the vertical output processor, the vertical coupling capacitor, or the vertical section of the yoke transformer.

If what you are talking about is a vertical line from top to bottom then you are possibly talking about a failed horizontal section of the yoke transformer.

Why so little about the horizontal section of the yoke? That is because if the horizontal section fails completely then you would lose high voltage and no line would be present because you would not have raster (screen light).

In any even check the yoke transformer first. Then work back from there.

I hope this helps,

Thank you,

Shuttle83

llc.com/">http://www.electron-age-technologies-llc.com

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Proscan PS27123 TV Problem


just to be sure, is it vertical or horizontal? Anyway, if it is vertical, it could point out to the vertical Ic section or some loose contacts along the lines. If it is horizontal, it could be a filter capacitor along the horizontal Circuitry. Mark the high voltage capacitors along the high voltage sections.


regards,

chris

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Black horizontal lines across bottom 1/3 of screen


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