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Sony tv no picture only horizontal line


hey buddy! pls. help me with my sony tv. model no. kv-19apr2, it has sound but don't have picture, only yellow horizontal line... pls. tell me what do and what to check, i don't have oscilloscope only vom, aside from vertical IC, and resistors in vertical section what is the possible defective parts? pls. i need your expertise...

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  • milmar
    milmar Aug 01, 2008

    the IC part number is UPC1488H

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  • 2 Answers

Check the diode from flyback who supply the vertical ic..

Posted on Nov 18, 2012

I already replaced it with LA7830, but it does not work and the electrolytic capacitors i replaced already but still it wort work...

Posted on Aug 01, 2008

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  • 4,234 Answers

The probable defective part is the vertical IC. If changing that does not resolve the problem, check the capacitors in the same circuit. Also, check for the proper voltages at the vertical IC. If the IC is not being fed its power, it won't work either. I don't have a listing for your specific model. If you can post the vertical IC part number (LA7837 for example), I can list the voltages per pin.
Dan

Posted on Apr 09, 2008

  • ABRsvcs Aug 01, 2008

    The upc1488 is the same as an LA7830. Try resoldering the pins first. If that fails, replace the IC with the above. That part should have a part designation written on the board like IC301 or something similar. If replacing the chip does not completely resolve the problem, look for capacitors in the same circuit that will be designated as C3xx to folow the designation above. In other words, if the IC designation is in the 300's than the associated parts will also be in the 300's. Look for capacitors in the 100ufd range and replace them.



    Keep me posted,

    Dan

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BFixed
  • 104 Answers

SOURCE: picture problem

Aside from the parts you mentioned check the vertical connection to the yoke (usually yellow and green wires), it may have a cracked solder joint or it could be burned. Also check the yoke for a broken vertical winding.
If the line is yellow with no other colors you may also have a bad color gun or drive transistor. If all color guns are working the line should be white.

Posted on Mar 14, 2008

6ya6ya
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Posted on Jan 02, 2017

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