Question about Sony FD Trinitron WEGA KV-24FS120 24" TV

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Why does standby light keep blinking constantly and picture keep flashing off and on

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  • Sony Master
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Could be any one of a number of factors, including:

a) a protection circuit could be malfunctioning;
b) your flyback transformer is arcing, hence the flashing picture;
c) power supply is not oscillating at the correct frequency, causing varying HT and affecting the line output stage;
or
d) worst case scenario, your CRT could be shot, which would make the set uneconomical to repair due to tube replacement cost.

DON'T PANIC ABOUT THE CRT JUST YET: I would advise checking every component (look for dry solder joints and resolder accordingly) on the main board thoroughly, starting with the power supply and working towards the horizontal output stage, in particular checking all the tuning capacitors in the collector circuit of the output transistor, making sure none of them have dropped in value, as well as the transistor itself.

Once you have completed all checks, if it turns out the flyback transformer is the true culprit, replace both this and the horizontal output transistor with correct type numbers. You should be able to order new ones. This is just a starting point suggestion here, but it may bear fruit and could save you hundreds of dollars in workshop charges/fees.

Posted on Feb 14, 2011

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Posted on Jan 02, 2017

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Posted on Jun 26, 2008

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