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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2 Answers

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.

Dec 01, 2010 | Haier TN201AUV 20" TV

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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.
  1. Set By Program. Selects the proper picture proportion to match the source’s image. (4:3 → 4:3, 16:9 → 16:9)
  2. 4:3. Choose 4:3 when you want to view a picture with an original 4:3 aspect ratio, with gray bars appearing at both the left and right sides.
  3. 16:9. Choose 16:9 when you want to adjust the picture horizontally, in a linear proportion to fill the entire screen.
  4. Horizon. Choose Horizon when you want to adjust the picture in a non-linear proportion, that is, more enlarged at both sides, to create a panorama view.
  5. Zoom 1. Choose Zoom 1 when you want to view the picture without any alteration. However, the top and bottom portions of the picture will be cropped.
  6. Zoom 2. Choose Zoom 2 when you want the picture to be altered, both horizontally extended and vertically cropped. The picture taking a halfway trade off between alteration and screen coverage.
  7. Cinema Zoom. Choose Cinema Zoom when you want to enlarge the picture in correct proportion. Note: When enlarging or reducing the picture, the image may become distorted. You can adjust the enlarge proportion of Cinema Zoom using D / E button. The adjustment range is 1~16.

Oct 18, 2009 | LG 42LC2D 42 in. LCD HDTV

1 Answer

I have a Dell 17" LCD monitor with a horizontal band.
You would better served replacing monitor you can buy one for about $100-$120 dell if you lie has one for $99

Mar 01, 2018 | Dell Computers & Internet

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Sony KV-27FS200 bright horizontal line problem
try to replace all filter capacitor on vertical section area that can solve your problem. 

Mar 07, 2009 | Sony FD Trinitron WEGA KV-27FS200 27" TV

1 Answer

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

Feb 07, 2009 | Proscan PS27123 TV

1 Answer

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

Jul 23, 2008 | Proscan PS27123 TV

1 Answer

Sony KV-24FV12 picture problem
Alright, TV has hardware problem in Horizontal section and I would suggest to set Picture Quality as Soft Mode.

Jun 20, 2008 | Sony KV-24FV12 24" TV

1 Answer

No Picture
you have no horizontal drive to fire up the high voltage section to produce brightness,possible horizontal transistor (output) shorted .they cost around 20.00.take set to shop for repair,also ask for est. of cost to repair.

Mar 01, 2008 | Proscan PS32500 32" TV

1 Answer

Black horizontal lines across bottom 1/3 of screen
This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.

Aug 23, 2007 | GE 27GT722 27" TV

1 Answer

Horizontal bands
you may have a problem with the vertical output IC.

May 26, 2007 | RCA F27442 27" TV

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