LCD connector reliability .

Hi to all...

I have about two years selling a Mini2440 based product. In general terms,
I find them a reliable product, but almost all the reliability issues I
have found, have been LCD related. Even more, most of them have been
originated by the little PCB that matches the 40 pin LCD cable, with the
Mini2440 board. Some time it seems like It disadjusts itself, some times it
just don't make good contact after a time of working well.

I was wonder how another mini2440 users are adressing this kind of issue,
and avoid contact problems between the 40 pin cable and the Mini2440 board.

Thanks for reading and for your help.

Hello ferite.

I know of at least 10,000 Mini2440 in the field in OEM applications. I have
not heard of any problems with the little part (FriendlyARM calls it a 4041
or 4140 because of 40 contacts on one side and 41 on the oval). In fact, I
don't hear of any problems at all!

If I was making a robust system I would consider firmly seating the
connector and after testing, use some hot-glue to secure it against
vibration or creep. Hot glue is good because it holds yet can usually be
pulled free without damaging boards.

An alternative is to take the video from the expansion header and use a
soldered FFC connection. The white FFC with blue ends is tinned for
soldering.

Hi Regnirps.

Thanks for your answer. i think I am going to try hot glue, or even, super
glue. By the way, is very interesting your experience. What could you tell
about temperature?. I have not seen failure due to heat, but in a closed
case, working 7/24, heat can get high. Could be that an issue?

Hi ferite.

The Mini2440 only dissipates about 2 to 3.5 watts with a 3.5" display and
no USB devices. Assuming there is a power supply also in the box and it is
80% efficient, you are still under probably under 4 watts total. The supply
shouldn't de-rate till around 50C. The box would have to have great thermal
insulation for that to be a problem.

I don't remember the numbers exactly. There is some power information in
the FAQ at andahammer.com