I have a Raspberry Pi 2 connected to a Dell 1707FP monitor via an HDMI-to-VGA cable. Every minute or so , the screen will randomly turn black for a second and then return. This occurrence happens randomly. I have tried the cable and monitor with my laptop and they work fine. What is the most probable issue and how might it be solved? Thanks.
id say that it may likely be due to power draw, your adapter(the hdmi to vga cable) you are using. If it isn't powered by itself it may be the cause of your problems, as the pi wasn't designed to power active adapters over its hdmi port, and your problem is likely intermittent as it may only occur when the adapters or the pi's power draw spikes such as when the display has a rapidly changing image or when the pi's processor is being utilized to its full capacity. This also explains why the adapter works just fine with your laptop.
Did you try to config /boot/config.txt, something like below
Setting hdmi_safe to 1 will lead to "safe mode" settings being used to try to boot with maximum HDMI compatibility.
You may add the line below to /boot/config.txt:
I had the same exact problem and was able to correct it. The hardware I was using was
- Raspberry Pi 3
- HTMI to VGA adapter and VGA cable
- An old 800x600 Westinghouse monitor
This was something I haven't seen in years but remembered that some monitors will blank periodically when over-driven. After adjusting the default resolution to 800x600 it stopped. I believe I was over driving the monitor and it wasn't the board or cable.