It's right there on the board:
Row F - ROM E0 needs to be fixed, there is no way to get that replaced as it is programmed.
Row F (again) - Far right on the socket, it needs a 74LS138
Row E (RAM Section) - 5 4116-15 RAM Chips. You can gently remove the current three and see if it turns on with just 32K after the 74LSXXX chips are replaced. If it does, put 8 RAM chips back in the motherboard to get the full 48K.
Row B - 2 74LS257 chips are needed in the board.
This is a total of 8 chips; 5 are RAM Chips, 3 are 74LSXXX chips. Should not cost no more than $20, perhaps a lot less. BUT I do not know what shipping will cost you.
So, when you get these in, and you still get a bad screen, you're half way there to fix it. It will take time (and money to buy chips) but it is doable.