Yeah... it did nothing apart from turn the light from a reddy colour to white. 
That's because you activated the test-screen of the game by pressing that button. That is not the test button of the monitor but of the game....
First you will have to know WHAT monitor this is....
If we _assume_ that it is en EZ20, the test switch is a sliding switch, not a push button, just like the flow chart says SLIDE the test switch.....

I also don't think this is a cap issue.....check the flow chart...Apart from failing transistors it can also be poor contacts/bad solderings.