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When you first plug in the TV the screen lights up with a thin blue horizontal line across the center then it appears that the power to the screen cuts off and all I am left with is the green standby light blinking. I did pull the back off and check the fuse, it is fine.

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  • wcv308 Apr 05, 2011

    JVC AV-27FA44 ASA

  • wcv308 Apr 05, 2011

    ....well I'm pretty good with electronics and soldering, I actually discharged the tube about half an hour ago. If I'm right the flyback transformer is the unit that is connected directly to the tube (where I discharged the tube). As for the deflection unit I'm not sure which it is....unable to get the exact service manual for this TV, though i have one for a similar unit. So is there a way to determine which has the problem without having to just replace one and hope it works?

  • wcv308 Apr 05, 2011

    Im pretty good with electronics and soldering. I actually have already discharged the tube. I know which unit is the flyback, but not sure about the other. I was unable to get a service manual for this exact TV, but I do have one for a similar unit.
    Is there a way to determine which of the units is malfunctioning? It would be nice to only have to replace the one that isnt working.

    Also I failed to mention this earlier, but you may have already understood this. Once the TV cuts off and the light is blinking, the set will not turn back on unless I unplug it first, and then the whole process repeats.

  • wcv308 Apr 05, 2011

    Sorry for the repeat response.

    So just to make sure....I plug the TV in, see if the clip is arcing, or actually hold it close to the hole and see if it arcs?

  • wcv308 Apr 05, 2011

    OK, one last thing before I plug this in. I am supposed to plug the anode cap back in, before I plug the power cord back in, and if not, is there any precaution I should take, with the cap, to make sure I don't get zapped?

  • wcv308 Apr 05, 2011

    Ok I plugged it in, I didnt see a spark or hear a spark, I did hear the....electronic stactic noise of the tube turning on (not sure if that is what you meant by guasing), but just as before it cut back off and the light it blinking again.



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Please tell me whats the make and model of the tv so that we can commence the diagnosis.

Posted on Apr 05, 2011

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  • eagle338
    eagle338 Apr 05, 2011

    Ok the problem you have mentioned is caused due to a malfunctioning HV circuit. Most likely to be the deflection or flyback transformer. The line accross the center of the tv before it shuts off confirms this. That being said how good are your electronics/soldering skills? I am asking coz this circuit holds potentially lethal residual voltages)around 30,000V) after the set has been unplugged. If you are not sure you can pull it off then its best to have a tech fix it for you. As my mentor says "your life and limb is worth much more than this"

  • eagle338
    eagle338 Apr 05, 2011

    That's pretty good. Yes the flyback is the one that powers the CRT. The most easiest way to test the flyback is to see if it's arcing. With the back cover removed power up the tv and see if you can notice a faint blue light emanating from it. If there is none see if there is a gassing noise coming from it. If none of these symptoms are present then we will do a more advanced test to see if the flyback is faulty

  • eagle338
    eagle338 Apr 05, 2011

    You do not have to hold close to see it. The arcing will be near the wires coming from the transformer not near the clips(anode cap etc.,) . If you cannot see anything, the see if you can hear a hissing noise coming out of it. It happens when the insualtion on the coils of the flyback is damaged

  • eagle338
    eagle338 Apr 05, 2011

    Yes you should plug in the anode cap before you plug in. Since you said that you have discharged the CRT, you have nothing to worry about. Plug the anode cap first and then plug the power cord and power up

  • eagle338
    eagle338 Apr 05, 2011

    Ok. That does not sound like it. Discharge the high voltage, remove the flyback from the board and follow this procedure to test it



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