Nano and ILI9488 TFT issues

Official Hardware Nano Family Classic Nano
1

Hi there,

I am currently using an Arduino nano to control an ILI9488 LCD Display. The link for the specific one I bough is Here

The issue that I am having is that the display works perfectly fine when powered by the Nano through USB connection to my laptop as well as USB connection to the wall, but I designed a PCB that powers the Nano via the 5v pin and now my display looks like this:

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I do not think this is a power issue because when I press the reset button on the Nano the screen displays normally for a second while it resets. I also do not think that the issue is with the PCB since the screen works fine on the PCB when the Nano is powered via USB. Any advice is appreciated, thanks!

2

how stable is your power supply? it's not recommended to power the Arduino through that pin.

where does the screen takes its power from? through the arduino or directly from your power source?

3

I'm just using a variable external power supply, should be stable. The screen takes power directly from the Arduino 5v pin. Voltage reading from a multimeter on the VCC pin of the display reads 5.009 V DC. When the screen is powered via usb the reading is 4.452 V

4

what would matter is if for whatever reason there is a short drop in voltage for example

have you tried adding a capacitor across the power supply?

can you post the layout of your PCB ?

5

Sure,

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edit: To answer your question, no I have not tried adding a capacitor. Right now, the only thing plugged in is the display.

I will also admit that after being plugged into the power supply for a while, the top of the display is warm to the touch.

6

I would try adding a cap and ensure there is enough watts from your 5V DC power supply.

How much current does the rest of the board draws?

7

Thanks!

The board draws 70 mA, which I am realizing may be the problem. I'm adding a resistor in there to drop the current down to 40 mA and will let you know what happens.

8

In where? I'm not much of an electronics engineer but it does not sound right. If you use a resistor to limit the power supply current, that will also reduce the power supply voltage that arrives at the component(s).

9

Added one between my power supply and the 5v pin on the Nano, its working now @J-M-L

10

Something weird is going on there…

11

What do you mean?

12

A resistor should not really fix it.

Unless May be there is a backlight for the screen that requires a resistor and it was not there initially ?

13

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