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?

Posted by Charlie Talbott on

  • 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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3 Answers

Anonymous

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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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Henry Thomas

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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

Why does 1/5 + 1/2 not equal 2/7?
Let's look at the overall picture. Does it make sense if you have a fifth of a pizza and add a half pizza, you get less than a third of a pizza.

Now, into the math.
Here is a fifth of a pizza.


fifth pizza-t3nl2udzxv0orsigcra1nwzp-2-0.jpg Here is half a pizza.


half pizza-t3nl2udzxv0orsigcra1nwzp-2-2.jpg
It is hard to add these two.

We find the least common multiple of the denominators 2 and 5 and get 10.

Let's redo the pizzas in 10 slices.

two tenths-t3nl2udzxv0orsigcra1nwzp-2-5.jpg

And the half pizza.


five tenths-t3nl2udzxv0orsigcra1nwzp-2-9.jpg

Now with the same sized slices, we can add the slices and calculate the result.


seven tenths-t3nl2udzxv0orsigcra1nwzp-2-14.jpg Now we have seven slices out of ten, or 7/10.

Good luck.

Paul

Jan 04, 2017 | Homework

1 Answer

AKAI Colour Television CT-1419A/AT plus AKAI remote RC-V9A. Television was fine, then went to just a narrow, bright horizontal band across the screen but sound is fine. Suspect my son played with the...
hi,
Its not problem with any setting. Its an internal fault. Vertical scanning output stage has failed in your tv. You have to check the soldering of the vrtical output ic if there is any dry soldering this can happen. try to resoder all the points in the vrtical output stage. IF doesn't help then you have to change the vertical output ic. Have added the picture of the dry soldering point how it looks like. If you need further assistance feel free to contact throug FixYa.



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okajin_g_54.jpg

Aug 20, 2011 | Akai Televison & Video

1 Answer

Virtical picture cut on the screen about half inch.
Depending on the monitor, you can try looking for an "Auto-Adjust" button. Pressing that should automatically realign the screen to it's proper proportions. If not, the monitor should have a menu where you can locate options to adjust the horizontal and vertical zoom, as well as position.

Mar 29, 2011 | Computers & Internet

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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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  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.

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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

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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. 

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Alright, TV has hardware problem in Horizontal section and I would suggest to set Picture Quality as Soft Mode.

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Vertical defection failure. Common failure. Pretty easy to repair ($50-75?). However, my general rule of thumb is not to waste any more money on TVs over 10 years old. Too much other stuff in there ready to fail as well.

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you may have a problem with the vertical output IC.

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Stationary horizontal lines
Thjeres a problem with the screen voltage driver voltage capacitor or the crt is going bad. have the shop test the b+ on the crt board first off . then remove the crt board and see if the voltage comes up. If it does the capaicitor is bad as it can take the load. But remeber theres extremly hi Voltage inside these sets so its never a good idea to try to do this your self unless you have the training to deal with HI Voltage and the proper saftey and test equipment. Good Luck

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