Yet another lynx with yet another problem

This time its a model 2 lynx
I got this lynx the other day, when it arrived it wouldn't boot up at all, made some odd noises from the speakers though. Anyway, i opened it up, looked around, put it back together and now the screen back-light comes on but there's no picture or sound. I've replaced most of the capacitors, I think there is just 1 which I haven't done. I'm starting to worry that this is going to be my second dead lynx haha

Oh and the brightness button on the front doesn't appear to change anything

there is a vague possibility that the game I'm using doesn't work but the ebay seller said it was tested working (Though I know it's not usually a good policy to trust everything said by random ebay sellers )

Here's a picture~
(although the speaker isn't plugged in, when it is there is no sound)




There's also a high pitched noise coming from the left side of the board
So yeah does anybody have any ideas about a possible fix?