lcd0821 backlight brightness problems - LCD0821 WB

[chriskner]

Take a look at the attached pic...

The backlight brightness is all over the map. I swear that they started out the same.

These displays have been in service for only ~1 month.

They now appear this way as soon as they are powered-on.

I've tried boosting "brightness" slider using uProject (232 mode). However, the dimmer dispays are still, well, dimmer.

Contrast adjustment doesn't help much either.

Replacing a dim display with a new display fixes the problem (ie, the problems are with the display and not power levels, cabling, etc)

Details below:
Model: LCD0821-WB
+5V, using I2C in-system
The displays on the lower row are all on the same i2c bus using the same power source (+5 @ 6amps).

Serial #'s:
"Wave Polarity" - 07M01-1860 - little dim
"Confining Pressure" - 07M01-1853 - Almost no backlight at all.
"Pore Upstream" - 07M01-1851 - bright
"Pore Downstream" - 07M01-1861 - 1 shade off full-bright.
"DifferentialLoad" - 07M02-1069 - dim

plus another display that we've replaced in yet another system:
sn: 07M10-4737 - very dim - in service for ~ 2 hours!

We need better quality than this... What's up?

Regards

Chris, EE
New England Research, Inc.
www.ner.com

[Clark]

Hi Chris,

Thanks for the post, due to the nature of your problem, a Technical Support representative will contact you shortly to answer all of your questions directly.

Thanks,

Troy