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herby
Total Posts:
3 
Since:
2016-Mar-09 
From:
Australia

colour lcd 5volt line has 5k wave form on it

Posted at:2016-04-13 05:32:08 Edited at:2016-04-13 05:34:28    

Hi,

Running the 2.4" colour lcd, I encountered some noise on the 5 volt line in my system application. Tracked it down to the screen which was pulling the 5 volt power line down by about 200 millivolts at a frequency of 5k.

This caused a problem with the rest of my system which requires a stable voltage. Any ideas how to minimise or stop the screen from pulling down the 5volt power level?

Sorry my screen is actually a 320 x 240 lcd

 
Service
Total Posts:
398 
Since:
2013-Dec-22 
From:
Canada

RE:colour lcd 5volt line has 5k wave form on it

Posted at:2016-08-11 11:10:56     

 It may because of the backlight PWM circuit, put the backlight full on (100%) or try a large bypass cap on Vcc may reduce the this noise
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