1981 Magnavox with a problem.

[Firebird]

I have a 1981 Magnavox tv. Model number RA5054. It has a t815-09 chassis. It has not worked for a while but somehow i have convinced my mother not to throw it away. I was there when she bought it in january 1981. It has stereo speakers and separate 10watt amps to simulate stereo. It gave a little trouble when it was new, the crt module was replaced and an ic was replaced on the power module. When you turn it on the channel number displays, no picture, no sound, The picture tube gun lights but after 20 or so seconds the reset button kicks out. After reading some of your post i ordered a horizontal output transistor, installed and resoldered pins on the retrace module. It still does the same thing. I have had some repair training but would like the advice of an expert.