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Ok, I was just wondering if some specific functions created a bunch of heat.
I've never noticed mine getting very warm.

So what was the big heatsink for exactly?
I still haven't even opened mine. But now that Miles has been getting me trained on some electronics work, maybe i could do at least the display swap.

Todd, I've had mine power up before and do just what you describe, all the LCD character spaces just solid blocks. But on disconnecting and reconnecting it works. I wasn't sure if it was a...

So it is a drop in replacement now?
Part number?
Was it NHD-0420DZW-AB5?

Nice work!
That is interesting. I've disliked how it is not backlit on occasion as well.