Display replacement on a 41CV/X halfnut

[Diego Diaz]

Hi John,

If you mean to replace the display board, first thing to consider is that the display in the HNs is mounted on a board that also contains the ROMs 0, 1 & 2; as well as the power supply, etc.

So, if the unit to recover is a CX you'll need a CX display board, and vice-versa.

Of course, if you install a CV display board on a CX and remove the "bridge" Timer PCB you'll end up with just a CV.

Apart from that, once the keyboard PCB has been removed by cutting the 36 plastic (mushrooms) rivets, there are just 14 solder joints to be undone. Fairly easy with a good soldering iron and extractor.

In case you're just meaning to replace the LCD, then there's no need to desolder the board. Undo the aluminium frame tabs and make sure that the pads, the zebra connector strips and the donor LCD are perfectly clean before reassembly.

Reassembling the keyboard PCB is where things become harder.

You can go the "cheap" way and place a small drop of superglue on every rivet, but it won't likely recover the tight feeling of the keyboard.

Drilling (by hand) a 0.8mm hole in every small post and replacing all the rivets with self tapping M1x2.5mm is a perfect solution; but it takes a lot of patience and a *very* steady hand.

Hope you find this information useful.

Really interested in how it goes for you.

Cheers from the Caribbean.

Diego.

PS: Just to clarify, I have just made th disassembly, but have not made the display replacement.