I have a La Crosse Time-Temperature device that I picked up at a garage sale about a year ago. It had a badly corroded battery compartment, which I got cleaned up, at which point the thing started working.
Recently, the display (it's one of those "big number" 7-bar LCDs) has gone quite dim when viewed head-on, but is plenty contrasty viewed at a large vertical angle. It did not have this problem when I first got it.
I know the most likely reason for that is a weak battery, but the cells checked out at about 1.5 V and replacing them made no difference.
La Crosse claims to have no schematics or other technical data at all ("the clock is made entirely in China").
Devices often have a "contrast" adjustment which changes some bias on the LCD and alters the best viewing angle, but this particular unit does not offer that as a user adjustment.
Is there some way that I can identify the particular connection to the LCD which provides this bias? If I could find it, I bet I could hack it.
thx
Isaac