Brightness on LK402-12

SilmarilS · Post by **SilmarilS** » Thu Apr 17, 2003 3:08 pm

Is there a way to change the brightness of the LCD backlit in software...?

I don't think so...

and it is possible to change it in hardware with a potentiometer or a fixed value resistor?
if so, where?

Miles · Post by **Miles** » Thu Apr 17, 2003 3:23 pm

Hello...

On this particular unit you cannot change the brightness of the backlight via the software. However you can remove the 2x10 ohm resisotrs on the backlight cct and replace it with a potentiometer. You must be very careful when selecting your potentiometer. You need a pot that will have the following specs; 1/2 watt 50 ohm. I know this may not be easy but in the long run you'll be much happier. It's needed to dissipate heat. If you are happy with a fixed resistor, just try taking 1-10 ohm resistor off.

SilmarilS · Post by **SilmarilS** » Thu Apr 17, 2003 4:07 pm

Can you post me a detail picture of the 2x10ohm...
My LCD is already mounted in a difficult place and want to see
if it is not to hard to do the mod....

Edit: as you post said, the resistor is on the lcd PCB, is it right?

Miles · Post by **Miles** » Mon Apr 21, 2003 11:30 am

SilmarilS · Post by **SilmarilS** » Mon Apr 21, 2003 1:44 pm

Now I see but I'm not very good at SMD soldering...

...
I will check for the required pot and if the job can be done for cheap...

Thanks for you reply....

Miles · Post by **Miles** » Mon Apr 21, 2003 3:59 pm

No problem...