It's always safest to discharge the monitor before working on a compact Mac. Though you *should* be able to remove and work on the logic board without messing with the CRT. Do so at your own risk.

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I feel the other way. In my experience, the only time I was ever shocked by a CRT discharge was while I was intentionally discharging the CRT. In other words, just stay away from that connection and don't try to discharge it. You'll be fine. Also, if you don't discharge it properly (through large resistor) you can damage board components.