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the most common problem in this set is convergence---two chips are used and if one shorts what you have happens--only way to prove this is get at and unsolder all 18 pins on both chips----if set turns on then the chips and or a resistor near them are bad.
Soldering and getting at the chips requires some skill--the parts involved usually are under 30 dollars total.
I have a toshiba 50hm67 tv and with mine the blue light would come on and I would hear sound first and then the picture would finally come on... this happend for about a month.... next the yellow and blue light would come on but the pic still wouldn't come on until it clicked off and on by itself for about 10 min this went on for about a week. All of a sudden last night the red lights by the power light started blinking. No tv now and when the tv shut off it said lamp not working.
Convergence ICs are STK392-110 you will need two of them they are available at the link I am posting and they give free instalation instructions with pics and free tech support so you can do the repair yourself.Heres the link. http://servicemanuals.vstore.ca/
have a sansui tv with a date of sept 2002 i bought the tv because it was on sale and have since lost the reciepts. anyways , no i need the tv and when powered up there is no picture but the sound comes on fine. i turnd it upside down and beat it and shook it and the pic came on for a min only to turn back off in 5-6 minutes. help. oh and i dont have electrical or circuit knowledge but willing to change a bulb or fuse.
as you say that sound is ok and picture also comes some time so please check loose contact in luminance section of chroma ic .
weak signal may cause rolling and intermittant picture problem for that checkloose near antena socket
It sounds like the 200v supply to the crt's is missing. this is the source for driving the tubes, other than the high voltage generated by the flyback transformer. If the set got really bright gray with wome white lines that are kinda on a diagonal, this is generally the cause. the source for this voltage is a diode on the secondary of the flyback transformer.