Question about Jwin JV-TV1010 5.5 in. Portable Television

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Horizontal white line

Tuner and receiver seem to work ok. Using the tv option all I see is a horizontal white line. I can hear audio OK. Seems there's a problem with the vertical . Do not have any schematics. any particular component failure that causes this?

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Re: horizontal white line

Verticle output transistor. It will be mounted to a heat sink. t should have Verticle stamped on the circuit somewhere near the Transistor. Locate the numbers on tht Tansistor and let me know what numbers and letters are, and i will post a link to where you can buy a replacement.

Posted on Jan 22, 2008

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Have you a digital multimter that can count frequency. if so the testing will be easier to you. Just count the requency at the collector point of horizontal driver transistor, or at the base of horizontal output transistor. it should come around 15.625KHz [15625Hz]. When the tv wors with no signal this frequency may differ, but come very near to it. When it synchronises with a picture, it won't vary and will remain constant.
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