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Hi my name is john and I have crt 20'' tv five year old model brand 'Megavision'(not a sofisticated model). The prblem is: I'm switching my tv on and after about 5 minuits the screen goes black! sound is o.k . The only way to recover picture is to switch the tv off then on! after again about five minuites the picture goes again ! I repeat the off-on method and we are back in business. The fault doesn't look to be intermedent nor due to a bad joint. Can you please give me an advise how to go about it to fix it ? (I am an amateur electonics educated) Thanks a lot. Regards John.

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  • johnpavlides Jun 15, 2009

    The back of the CRT is glowing and there is no difference in appearance wether there is a picture on the tv or is black!

  • johnpavlides Jun 15, 2009

    As I explained before the problem is not intermident but I would say steady after about 5 minuites of working. As soon as I switch the tv off and back on, the picture recovers straight away! then after few miniutes goes off again. Could the problem be a capacitor or a transistor? and at which area?

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As I explained before the problem is not intermident but I would say steady after about 5 minuites of working. As soon as I switch the tv off and back on, the picture recovers straight away! then after few miniutes goes off again. Could the problem be a capacitor or a transistor? and at which area?
=================================================================\

OK, two possibility that I can think off,
Either Screen volts dropped / decreased to certain level and seems need adjustment. There would be control knob of Screen Volt (G2) either on fly back transformer or RGB board fixed at end of CRT.
OR
Video out signal got mute for some reason that needs schematics to investigate why this happens. if you have schematics of this Tv, email it to me welcomejee@yahoo.com to find video mute section and its possible activation reason.
Thanks.

Posted on Jun 15, 2009

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The fault description closely fits a common fault with all CRT TV sets , here's what to do , if you can peer through the back cover and see the Tube neck there should be a light glowing inside !! if you can`t see the light then the fault is probably dry or bad joints on the tube neck board that supply filament voltage to the tube, just needs re soldering, good luck

Thanks
K

Posted on Jun 15, 2009

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