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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
That sounds very much like a short that is pulling down the power supply, esp. if the picture forms and shows on the screen for just a second, when powering the TV to On, before it goes black. Is that how it has behaved, even through the parts changes?
Does the power light ever blink on and off? if so, count the number of blinks before it pauses and then repeats the blink pattern, please.
Do you have a service manual for this brand of TV?
It might cost a little -or it might be free, perhaps, if you're lucky - but it would save some money in boards swapped in that turn out not to fix the problem. It would contain troubleshooting information. Diagrams, part numbers, that sort of thing.
Would you like for me to seek a service manual source for this model line of Sanyo TV?
OK. Expect another posting within the next 30 minutes with some results, I hope...
I am terribly sorry - other work appears to have distracted me from posting to this case again.
I must apologize.
Here is a service manual - to not go through it online page-by-page, use the green DOWNLOAD button at the upper left:
If I may provide further advice, let me know.