I had a problem with an HMI that sometimes doesn’t boot, what we discovered is that if we warm it up by a heat gun for a while and then power the screen, it boots and works perfectly. We then tried to replace it with an available, but smaller in memory capacity, SDRAM from the same family, however, it didn’t work.
Finally, we swapped the two rams and it worked perfectly.
My question is why it worked when warmed up without swapping? and why it worked when swapped without warming-up the rams?
Thank you in advance.