No display after routine thermal compound application.

Looks like you got components burnt L9004 and C9015 they are on the line of PP3V3_LCDVDD_SW 3.3v but instead of just replacing them you need to find out why and how they burned in the first place it may do it again you probablly broke one off one the components by accident which is a good chance then a simple replace of the components may do the job you need also to take voltage from that 6 legged chip sort of close to the Plink Fuse U9000 also go to capacitor C9012 and see if your getting 3.3v there.

You could alternatively start with replacing Inductor L9004 which is a 402 package @ 120 ohm 1.5amp and cap is a 10uf 6.3v in a 603 package you can get them from digi key or mouser also pins 2 and 3 look a little dark on the lvds connector you may need to inspect and touch them up a bit.

If your really serious about repairing this search a1278 no backlight etc on youtube you find some professionals in action it's 2 part really the hunting troubleshooting and the physical reworking of the board.