Check all the associated components at the power supply regulator section circuit; especially check the zener diode/s. Replace them. Replace the STR only after replacing these components. There is a chance to these components too can damage, when the original STR has burned out by any reason. If you wish to get more, about the schematic diagram; check the site linked here. Type in the number of STR in its search box, or
Pull up previous posts, either by type in the Brand name to
your set in its search box, or view it in
Mosaic / Timeslide / Flipcard option.
http://electronicshelponline.blogspot.com/
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