"No Signal," a black screen, or dropped picture quality on a Sony Bravia (XR and X Series) over HDMI is almost always one Sony-specific setting: the Enhanced HDMI signal format, which is off by default and must be turned on per port for 4K HDR and 120Hz. Get that plus the basic handshake right and the picture comes back.
The Sony-specific fix
A 4K HDR source on a Bravia port left in Standard format shows "No Signal" or a low-quality picture. Turn on Enhanced for the port in use:
Settings > Watching TV (or External inputs) > External inputs > HDMI signal format > select the HDMI > Enhanced format.
Set it only for the ports feeding 4K HDR/120Hz devices. (If a device misbehaves on Enhanced, that port/cable can't carry the bandwidth — drop to Standard or use a better cable.) If the symptom is washed-out color or HDR that won't engage rather than a hard No Signal, the Sony TV HDMI and HDR picture guide drills into the format side.
The basic handshake fixes
- Select the exact input and reseat the cable at both ends.
- Power-cycle in order. Unplug the TV and source for at least 30 seconds, power the TV to its home screen first, then the source.
- Swap the cable. A cable fine at 1080p fails at 4K HDR — test a short certified Ultra High Speed cable.
- Try another HDMI port. If one input is dead but another works for the same device, that port has failed.
The BRAVIA Sync (CEC) angle
A misbehaving CEC device can grab or blank an input. If "No Signal" comes and goes as other devices power on, turn BRAVIA Sync off (Settings > External inputs > BRAVIA Sync settings) to test, then re-enable once you've found the culprit.
If every input fails
Check for a software update (Settings > System > About > Software update), then power-drain the TV (unplug 60 seconds). All inputs dead for every device, with the TV's own apps fine, can indicate the HDMI board — but confirm the Enhanced format and cable first.
FAQ
My Sony Bravia says No Signal only at 4K. The port's HDMI signal format is on Standard. Set it to Enhanced under External inputs > HDMI signal format for that port.
Black screen that comes and goes. Often a CEC device. Turn BRAVIA Sync off to test, and power-cycle the TV and source in order.
One HDMI port is dead, others work. That port has failed — use a working one. It doesn't mean the TV is done. For the sound-but-no-picture variant, the Sony TV HDMI black screen fix isolates whether it's the source, port, or panel.
Do I need a special cable? For 4K HDR/120Hz, a certified Ultra High Speed cable, and the port set to Enhanced format. A marginal cable triggers No Signal on Enhanced.