Question about Symphonic ST419E TV

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TV Picture Reduced to Line across the Middle

At first the picture was as if across the top of the picture had been folded down over itself - about 3 inches.

Now it is just a thin line of light across the center of the screen. Does it need a little tube, a huge tube or what? Is it worth having someone repair it?

Could I repair it myself, or should I take it to the dumpster? Thanks,

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  • 3 more comments 
  • pdmm Jan 16, 2008

    same problem...screen folded down over self ..now today just a line through the middle

  • Marcie007 Jan 21, 2008

    Thanks, What are the chances you have access to schematics that could direct me on what is and where it is? I am no electrician, but am mechanically inclinded. My dad doesn't want me to go into the TV, he says even when it is unplugged, there is power stored up in the components, that could blow up on me. Your thoughts?

  • Marcie007 Jan 21, 2008

    Wow, thanks for all the info.....tell me, in AZ, what do you think would be a fair price to fix it....ball park?

  • Marcie007 Jan 21, 2008

    I posted my response in the wrong place, it sounds like I need to go to a repair person. I am not too old to be warned. In AZ, how much do you think it would cost, ball park?

  • Marcie007 Jan 23, 2008

    Wow, had no idea I was talking to South Africa.......guess I thought the world was USA, hehe.



    Thanks so much. I will let you know what happens, cause I know you are holding your breath!

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This is called field-collapse. Either

1. The problem lies in the vertical deflection voltage-doubler circuit. The usual fault is a single capacitor of 100uF/35V that has failed. It is normally connected to a rectifier diode right at the vertical IC. Replacing the capacitor usually gets it working perfectly again.

or

2. The vertical drive IC has failed.

If you are finicky around technical work, then a reputable local repair shop in your locality should do it quickly for you and charge only labour.

Posted on Jan 21, 2008

  • Rio de Loca
    Rio de Loca Jan 21, 2008

    Sadly, free schematics are generally hard to come by. One normally pays around $14.99 for each. However, there are a few sites that you might want to try, e.g.


    http://www.filekeeper.org/download/brows...



    or



    http://www.orbit-el.net/tehnicka_podrska...



    One nice little trick is to open up the TV, identify the vertical IC (its the one somewhere around the middle of the board), read off the number and tell it to me. Then I can look in my own archives for any circuit using the particular part. You'll be surprised by how many TV circuits are actually "ORIGINAL". Mostly they are "kindly borrowed". This commonality provides a trick that makes it easy to fix in the absence of proper schematics.



    Your Dad is right, of course. The tube itself is a small but almost perfect capacitor. It charges up with high-tension (+40000Volts) that it retains for years. With some care, it can be discharged instantly to render it harmless. The mains capacitor is another such, though it deliberately has largish resistors called bleeders to drain away the charge when the unit is not in use.



    I would suggest extreme caution if you intend to partake in TV repairs. Talk nicely to the local repair chaps and they just might make an apprentice out of you. That's actually how I did some learning, aged 8! Good luck, friend.

  • Rio de Loca
    Rio de Loca Jan 22, 2008

    I don't know about in AZ, but here in ZA (South Africa, cute!) I normally charge the equivalent of US$40 - that's about ZA Rand 300.00; this price is mostly just labour since no major replacements are done. So it's worth having it fixed.

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