Hi @louw ,
When the TV powers on do you get a display e.g. logo and can you access the menu screens OK?
Have you tested the remote with a digital camera to check if it is working?
Point the end of the remote that you normally point to the TV, towards the lens of a digital camera (or mobile phone camera).
When viewing the remote through the LCD screen of the camera (or phone) press any button on the remote and check if you can see a light flashing at the end of the remote. If you can this is the IR signal that is sent to the TV.
No TV power light is a worry as LEDs seldom fail.
There may be a problem with the power board or the mainboard.
The power LED indicates that the TV is ready to be turned on. If there are problems after that, then that is different.
If the TV is no longer covered by the manufacturer's warranty , you'll have to remove the back cover from the TV and start taking some voltage measurements on the power board. With the TV just powered there should be a standby voltage supplied from the power board to the mainboard.
This voltage tells the mainboard to turn on the power LED, which maybe it is trying to do but if for example the power supply to the LED from the power supply is missing then it won't turn on. This “missing” voltage may also supply other sections on the mainboard etc This is just guesswork on my part though