Help Identify SMD components
You could unsolder them and check if there are any markings on the backside of the component. They might not be dead and just need to be resoldered.

Here is a ressource to find components based on their markings



As the comment mentioned, they are likely MOSFET or BJT given the Q markings (they also can be other less common transistors like JFET).

Possible matches for the 6b Here

And for the TG Here



Q17 Might be 2sk302 

Q18 might be BC817-25



You can go through the list and check the datasheets for size match.