Zenith tv problem model No# SR3587DT

i have a zenith tv model no# sr3587dt. when came in shop it was dead I replace fly back horiz. output tran. set came on for a few min. and then high voltage shut dowen the audio still plays. I have tried to fine a service mannual but no luck. When checking voltages on CRT board it seems the output voltages are 128v i done think they are high enough. so if you have any ideas on what is wrong i sure would appreciate the help.or have a service mannual on that cricuit, email reddotdale@tampabay.rr.com