You have to take the back off, I'm afraid.
If you've never done this, there are two screws underneath and a pair of internal plastic clips at the top. You push down on the top / front part of the case about an inch in from each side to release the plastic clips. It's hard to describe - there's kind of a knack to it. Please don't butcher up the case by trying to force it with a screwdriver!
The adjustment is on the left-hand side of the monitor (looking from the normal viewing position) and is labelled L501. You need a plastic hex head adjustment tool. The correct image size is 205mm wide by 153mm high. Some people like to adjust it right out to the edges of the visible area, however this is not the correct size - you lose the true WYSIWYG features of the Mac if you do this.
The adjustment is close to to the EHT transformer - an area where high voltages are present. You must use a plastic tool for this adjustment for safety (plus you can crack the ferrite slug if you use a metal tool).
If you've never done this, there are two screws underneath and a pair of internal plastic clips at the top. You push down on the top / front part of the case about an inch in from each side to release the plastic clips. It's hard to describe - there's kind of a knack to it. Please don't butcher up the case by trying to force it with a screwdriver!
The adjustment is on the left-hand side of the monitor (looking from the normal viewing position) and is labelled L501. You need a plastic hex head adjustment tool. The correct image size is 205mm wide by 153mm high. Some people like to adjust it right out to the edges of the visible area, however this is not the correct size - you lose the true WYSIWYG features of the Mac if you do this.
The adjustment is close to to the EHT transformer - an area where high voltages are present. You must use a plastic tool for this adjustment for safety (plus you can crack the ferrite slug if you use a metal tool).