Bert Coules wrote:

when I opened the case I
discovered that the two ribbon cables which connect the main board to a
(fixed) sub-board don't have proper connectors but are fitted with the
bare wires pushed into soldered sockets.Â* Dead easy to pull out, rather
less so to refit...

That type of "flatflex" cable usually has some form of (weak, easily
breakable) latch.