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Tv turns itself off after turning it on - Sharp 19K-M100 19" TV

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Check SMPS circuit.
Check for dry capcitors. Replace OPTO coupler in the feed back circuit in SMPS.

Do not switch ON TV without opto coupler fixed in circuit.

SMPS will go out of control and the + DC voltage will raise infinitely and damage the other parts. If transistors used along with the opto coupler, check them for leakage. Replace them. Otherwise the replaced opto coupler may fail again after few days or few hours of TV working.

Posted on Aug 19, 2010

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