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Is your chassis a single board chassis with the fuse in the front right hand corner (viewed from rear of set)? It could be one or more diodes in the bridge rectifier network (there are four). If the set uses an STR53041 regulator; it could be shorted. It's a 5 legged device on a heatsink. If it's shorted, there is probably a transistor and some resistors around the regulator that are also bad. You'll also want to change any electrolytic caps in the regulator circuit. If you've got the model number, I'll see if I have a diagram for that set. The module number (9-XXXX) would be nice, too.
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