NAND problems....

Hi,
I've had my mini2440 board for about one year now and I experience this
problem again and again: I install software to the NAND, be that linux or
anything else. Then I simply use, compile my software and copy it to the
mini and everything works like a charm! Then I leave the board laying
arround for some time (days, weeks) and start it again and my NAND is
faulty! It does not boot anymore. I thought maybe the battery on the board
was flat but it's good. 

I read that some boards have problems with the power supply. Could this be
causing it? I'm quite unhappy with this because I dont want to reinstall
all my stuff over and over again, also what I'm developing is meant to be
realiable! 

Have you experienced this? Any ideas what I can do?

Hi,

Electricity of human body, is one of the most important enemies of
electronic modules. It may cause, unpredictable behavior of boards. Another
enemies are mechanical pressure or shock during installation (that may
cause disconnections in pcb layers), continues heat on parts, ... 

Have you protected your boards ?

best regards
www.dadehabzar.ir

Well my board is sitting on my desk :). Shouldn't be too much hazard here.
Btw my NAND is 128mb deep and it's a HYNIX chip!

I always use at least two (normal three) sample boards for benchmarking.
by the way, ten years ago, the brand of chips, was a critical issue, but
now-days most of them are enough good for most applications.   
regarding power supply, only few parts of mini2440 board use 5V (directly
from plugin). you can check your power lines (5V, 3.3V, 1.8V with dedicated
grounds) by monitoring them (using digital oscilloscope) during start-up of
board. they should be stable  and noise level should be about 50mV.


best regards
www.dadehabzar.ir