How should I start fault finding on mini display that keeps flashing on\off?

Electronics
1

I know that this is a little vague, but I have a no-brand 9" display and a no-brand control board that I got from AliExpress. They didn’t come with any instructions.

This unit

I’m attempting to use them to create a case-mod that will display a cycling wallpaper using DMT as the software on Windows 10. It’s display 3 of 3. Display 1 is DP, display 2 is HDMI

The display is connected to a 3amp used power supply and an HDMI cable.

Sometime when I turn my PC the display comes on as expected, other times the back light flashes on every few seconds but nothing else. I need to pull the power and the HDMI out of the board to get it to run. If I pull the power or the HDMI at source, then it still just flashes.

Sometimes when I turn one of the other monitors off, the same happens. The screen goes black and the back light flashes every few seconds.

I wonder if my PC might be trying to send it too high a refresh rate, but I don’t know the native rate.

I wonder if it’s not getting enough power, as if I try to use a longer lead on the power it also flashes like this (It won’t turn on at all if I use a USB extension cable, or a longer 5.5mm cable).

How should I start fault finding?

I’ve already confirmed that Windows can see the display.

2

You can try lowering refresh rate, updating drivers, and adjusting control board settings. Also maybe tweaking power settings might help.

3

Windows doesn’t actually offer me any of those options, at least not that I’m aware of. It gives me a fixed refresh rate of 60hz, and plug and play drivers only.

I don’t know where to begin adjusting the setting on the board as it’s jumper based and I have no instruction manual. There are no software setting in the OSD for resolution or refresh rates.

6

“mironmiron” was, it turns out, an SEO spammer and wasn’t really trying to help you. :frowning: They have been permanently suspended from Maker Forums for spamming.

2 Likes
7

My problem turned out to be that the psu spec Ed by the seller was too low. When I tried a significantly better one it ran no problem.

4 Likes