Needless to say, it's probably not a blown capacitor. If the unit will not power on at all (control/standby indicators are not lit) the problem may be as simple as a blown fuse on your SMPS (near the AC socket) or on your Main Logic PCB. You should also use your fluke/voltmeter to verify that the Vs, Va, Vsc, and Ve values are reasonably close to those specified on the panel label. Re-post your findings!
If you get the menu the tcon is working and its the main..You won't be able to troubleshoot the main and even if you found the bad part changing it would be almost impossible in most cases, replace the board, try shopjimmy.com, that is where I get my parts, do NOT buy on eBay...to many people that know nothing about TVs selling boards that aren't tested, nothing worse than getting a replacement board and it doesn't fix the set.
When you said that you can hear the sound, what device is plugged in to the TV? Is it USB stick? HDMI cable for PC or DVD player? Or just the local channels using the antenna?
If the unit is under warranty (within a year from purchase in most cases) I would suggest for you to report it to Samsung so they can provide you a repair option as it would most likely be a problem with either the power supply or the board inside.
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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. https://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
If you wish to get some details; visit the site linked here. Pull up older posts. https://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts