Question about Sony KV-20FS12 20" TV

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Please, Help me fix my TV

When I turned the TV on, then the picture start blinking each 5 secunds, just the video get off end get on, the high voltage still that. I increase the screen voltage to see the picture on when the video turn off, Yes the screen stoll on. Please sumbody know fix this problem? Thank you for you help. I'm sorry for mi English

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  • Josias Aleixo
    Josias Aleixo Jul 02, 2007

    Thank you Scrivitron for your help. I replaced that resistor with one 2.2 homs, then the tv get better, then I put back that original reisistor, and I rejuvenated the picture tube, the video get perfect. Thank you so much. I'm sory for my English.

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It sound like you have abad picture tube. Iknow this is not the answer that you want to hear. Sony's have video blanking circuit built into the video processor(in the jungle IC) when the emission of all three gun fall out of an acceptaable range. the screen blinks and when you turn the screen control on the IHVT all you see is re-trace. Some times there is a current limiting resistor in series with on lead of the heater on the crt board. By changing this resistor from 2.2 ohm to >.1 ohm @1/2 watt you can sometimes increse the filament voltage to the point that the blanking stops. This is only a temporary cure not a fix. The picture tube is probably bad. Scrivitron

Posted on Jun 21, 2007

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