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This kind of problem mostly occurs due to failing capacitors on power supply board and some times main board (one where all video inputs are located) found defective, however, most of the times it is power supply board problem and you would need to check output volts of power supply board in TV with multimeter to determine the bad board, if standby 5V and 12V is stable/ constant then replace main board and if the volts are low then replace power supply board.
Please click following link to view power supply board image and price info if you have plan to do-it-yourself..
Please get the part number off of power supply board installed in TV to search/ google it to get better price info of Australian suppliers that will help you to make decision about this TV repair. I hope these info will help. If you have any additional questions, feel free to ask. If you're satisfied, please rate me a 5-star at the top of your page. Thank you.