Since the CRT PCB fell off it took a good hit. If you follow the input
cable it usually plugs into the CRT board. Make sure it isnt loose.
After that there is a good chance there is a cracked PCB. You
may want to start a claim just in case ........
Note: On most monitors if it dosnt see a sync signal it will go into
standby mode to save electricity. The sync comes in the cable then over to the main board.
good luck
Zeno
LFOD !