Facing TV Problems? Ask a TV Technician.
Hello, Tim is no longer an expert on the site, but I will be glad to assist you.
No signs of life at all indicates either the power board, or the mainboard have failed. The power board produces the 5 volts which feeds the mainboard, and the mainboard produces the power light.
To narrow down the root cause, set your meter to DC volts- ground the black probe to the TV's metal frame, and then use the red probe to test the point marked 5 volts on the power board. If this voltage is missing- then you will replace your power board.
If this voltage is present then you will replace your mainboard.
These board can be located at:
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.