HP Forums

Here is a useful link for certain TI calculators:

https://hackaday.com/2012/09/20/how-to-r...ectronics/

(skip the article, read the recommendations in the comments)

"I have some success with this sort of connection, grab a piece of TO-220 heatsink pad, turn your soldering iron down to about 280C (550F). Put the pad at a start point on the flex connector, side of iron tip nearly parallel to boards on pad, and drag the pad along the connect flex keeping the iron in contact. Doesn’t need much pressure. This can take 15 to 20 passes, it takes a while for the whole setup to warm up, but you don’t want to over do it."

I mistakenly tried a heat gun, which immediately melted the plastic.

In the past I have covered the flex cable with a layer of Kapton tape and then used a wide chisel tip on my iron. The iron is of course turned down to a suitable temperature. You do need to press down a bit, you need combination of heat and pressure, and wipe in the direction of the pad/trace.

Several months ago, I bought one of these special heat seal iron tips suggested by a friend, but have not had a need to try and use it yet: https://www.aliexpress.us/item/2251832834432706.html

I'm not sure how well this would work for the LCD columns connector on a Voyage 200. It seems you would need to peel off the rows connector to get to the columns connector underneath the LCD!