[41] Odd display problem

[emece67]

Thanks Frido, jeben & Geoff.

In fact I'd read the service manual (and the LCD driver chip manual) prior to starting the repair, so I have some knowledge of the expected behaviour of signals and voltages. After being sure that the pressure strips work, such signals were the next thing I diagnosed.

Apart from this 41C, I only have another fullnut (a CX) I can use to interchange the displays and see what happens. But up to now I'm reluctant to remove the LCD from the working CX. If, for any reason, its LCD also gets faulty... not a nice situation.

But it is probable that, in a few days, I'll feel that this is the last and definitive test I can perform to be sure that the problem is in the LCD assembly, so perhaps this weekend I'll perform the surgery.

Geoff, I have checked with a multimeter continuity from the keyboard PCB tracks to the tracks entering the epoxy blobs in the LCD assembly, but not having dismantled the LCD I haven't checked all connections on it.

I'll keep reporting here.

Regards.