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if that is a 18 or 19 inch portable. here is your trouble. on the board above the horizontal output i know it has a 5gh8a or a 6gh8a on it. i believe there is also the vertical out tube on the board. around the socket of the 6gh8a there is about 4 or so resistors that is changing value they are up next to the tube socket i believe. but it has been a long time since i have seen one of these. the symptoms you are describing are the exact same as when those resistors change value. it will get to the point of flashing all the time. wish i could tell you the resistor numbers . maby someone here can. steve
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