How do you fix SDI-to-HDMI issues?
You’ve got everything set up — the camera’s rolling, cables are connected, and your HD-SDI-to-HDMI converter is in place — but there’s no signal on your screen. Don’t panic. This is one of the most common issues church livestream teams encounter, and in most cases it’s an easy fix. Let’s go through a few simple steps to get your video signal back up and running.
1. Check Power and Connections
It might sound basic, but most converter problems come down to power or cable direction. Most SDI-to-HDMI converters require an external DC power supply or USB power. Confirm that the power LED is on.
Next, make sure your cables are connected correctly — the SDI IN port should come from your camera or switcher, and the HDMI OUT should go to your display or monitor.
Inspect both cables for loose or damaged connectors. A bent SDI pin or frayed HDMI cable can stop a signal entirely.
2. Verify Your SDI Source Signal
If the converter has power, the next step is confirming that your SDI device is actually sending a signal. Some cameras and switchers don’t output SDI by default, or they may require the output to be turned on manually.
If you’re using a Blackmagic ATEM switcher, open the ATEM Software Control and check the program or AUX output settings. If you’re using a camera, ensure SDI is enabled and matches a format your converter supports.
If you have an SDI monitor or field display, test the signal directly from the camera. No image there? The issue is likely with the source, not the converter.
3. Match Resolution and Frame Rate
A major cause of failure is mismatched formats. For example, your camera might output 1080i (interlaced) while your display accepts only 1080p (progressive).
Likewise, some converters don’t handle frame rates like 59.94 Hz or 23.98 Hz. Check both the camera and converter documentation for supported formats.
If unsure, try setting your camera or switcher to 1080p/30 or 720p/60, which nearly all converters and displays accept.
For stubborn mismatches, use a converter that scales or frame-rate converts, such as the Decimator MD-Cross, Blackmagic Mini Converter UpDownCross HD, or AJA UDC. These can translate between formats when a basic converter cannot.
4. Test the Display or Monitor
Sometimes the problem isn’t the converter at all. Try connecting your HDMI cable to another monitor or TV. If the signal works on one but not the other, the issue might be the HDMI input or settings on the original display.
On projectors and TVs, double-check that you’re on the correct input. For computer monitors, verify that the resolution and refresh rate match your converter’s output.
An easy test: plug in a laptop with HDMI. If that works, the display itself is fine.
5. Check Cable Lengths and Quality
Long cable runs are common in church setups, but SDI and HDMI each have limits. Cheap or overly long cables can degrade the signal, especially at higher resolutions.
As a rule of thumb:
- Keep passive HDMI runs under ≈ 25–50 ft before switching to active or fiber solutions.
- SDI is built for distance; with quality 75-ohm coax (e.g., Belden 1694A) a 3G-SDI signal can travel hundreds of feet.
If you’re routing cables through walls or ceilings, test with shorter lengths first. If a short cable works but the long one doesn’t, you may need a repeater, booster, or new cable.
6. When to Replace or Upgrade Your Converter
If you’ve gone through every step and still get no image, the converter itself may be defective. These small devices handle constant voltage and heat, and they can wear out.
Look for replacements that support auto-scaling, 4K compatibility, and broad frame-rate support. Trusted brands like AJA, Blackmagic, and Decimator are reliable options used across church and broadcast environments.
Final Thoughts
Most “no-signal” converter issues come down to one of three things: power, resolution, or cable quality. With a few quick checks, you can usually restore your video feed in minutes.
If you’re setting up your church’s livestream system, check out our related guides:
Stay calm, check your cables, and your converter will likely be back in action before the next service starts.
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