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I've fixed a few Funai sets with this problem and they used an underrated glass diode in the supply for the video output stage. This diode will short and burn up the resistor that is associated with it. Replace the diode with a heavier one and replacement of the resistor usually fixes the problem. If these parts are good, check the electrolytic capacitor in the supply line (usually between 2.2uf and 10uf, at least 200V). If all that is good, junk the set and find her another 13" TV.
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