So I followed an old thread here and as I understood it, this should work fine. I have ordered an L.C.D. driver board for a laptop screen that takes 12v 3a . I have a power cord that is 12v 400ma (which i believe is 4a) is that going to damage my board?
400ma is 0.4A.
With 12V into the barrel jack the 5V regulator may get warm.
TheBean:
So I followed an old thread here and as I understood it, this should work fine. I have ordered an L.C.D. driver board for a laptop screen that takes 12v 3a . I have a power cord that is 12v 400ma (which i believe is 4a) is that going to damage my board?
Can you post the link; using the proper url tags; to the older thread so that we may read it and understand what it is you are attempting to do?
12V 400ma is not going to work.
400ma is 4 tenths of an amp. i.e. 0.4 amps
you need a different 12v power supply.
Oh, ok that's all I needed to know my bad. I must have punched it into the amp converter calculator wrong. I appreciate the help. Thank you!
TheBean:
amp converter calculator
You shouldn't need a calculator to convert milliamp to amps.
I think you need to study up on unit measuring naming conventions
They are used everywhere in life,
i.e. time, length/distance, volume, area, mass, pressure, temperature, voltage, current, capacitance etc....
pretty much anything you can measure.
It makes moving between different unit scales very easy.
As other said, the 400mA will not work. The power supply will either shut down, have a meltdown, or will work as designed and the LCD board will not work because it doesn't have enough current.
CrossRoads:
400ma is 0.4A.With 12V into the barrel jack the 5V regulator may get warm.
Not if the LCD board is designed for 12v. Many of them uses full 12v just for the backlight.