Hi, If your sure it's not the mainboard, you could check the Tcon (LVDS) board. Might just be a smd fuse?
The last Finlux 32" I fixed was the same fault, and it turned out to be the eeprom on the mainboard. I had to use the eeprom bin file download from the forum, as the one I had in a spare board would not work with the panel inside the Finlux. Also If I removed the eeprom and played around with the buttons on power up I could normally get a menu image on the screen (might be something to try).
Whats the mainboard number?