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Your tv set suffered short circuit problem in the power supply area since it fails to turn on. Try to open the cover of the tv and check for the damaged parts like a busted fuse or shorted power transistor and replace it.
sitnlisten - yes it does appear your pix tube is getting weak,but we may be able to turn up the flyback alittle to brighten up the picture.If you take the back off you will see the flyback-large black unit with a wire going to the round rubber cap on the back of the pix tube.Look at the flyback there are usually 2 adjusters one marked focus the other screen,just turn up the screen a little bit at a time.If you turn this up too much you will wind up with retrace lines on the screen.You may also want to check the pcboard ass'y for a sub bright adjust,and same thing small adjustments.If this don't help your pix tube may be too far gone.I hope this helps. cooltek Feb.1/08
Get an ESR meter and check the ESR of all the caps in the horizontal scan area. I don't know the particulars of the model of set, but I would not rule out damage to the flyback, or any of the other components in the drive circuits to the deflection yoke. This type of fault can take some time to troubleshoot and work out.