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Here is a board, it's from Canada but with shipping is not to bad priced at $60. I know nothing about the seller so it's possible you could get a defective board. I assume your missing the ps_on signal from the main and that's why the set won't turn on
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size. Can't determine the condition of the power supply board, by just examining the fuse; you know. Contact any service technician.
Check whether same things happen on headphone. Some components are getting excess voltage and heating up. Better to refer it to a qualified service technician.
Power supply, or a failed circuit board causing the power supply to go in to protect, or be damaged. You will need the service manuals, test setups, spare boards and parts to try, and especially the training.
I would consider calling the service rep for your set to get an estimate. If not, get an estimate for a new set.
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