Most of the time this is one setting: the receiver's HDMI input is running in its standard 4K mode, which strips the bandwidth Apple TV needs for 4K HDR. Whether that's the factory default depends on how old the receiver is — an AVR-X1400H ships on Standard, an AVR-X4800H ships on Enhanced, and an Onkyo TX-RZ50 ships on 4K Enhanced for every input. Denon's stated reason for the conservative option is possible incompatibility with the connected device or cable, not older TVs specifically. The Apple TV is fine, the cable is usually fine, and the fix is a per-input setting most people never find.
Fix it
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Switch the receiver input to Enhanced mode. The name and location differ by brand, and this is the part that trips people up:
- Denon and Marantz — the setting is
4K Signal Format(newer models:4K/8K Signal Format), set to Enhanced. It lives in the on-screen menu under Video > HDMI Setup > 4K/8K Signal Format, and it's per-input. Denon also documents a front-panel route for when you can't get a picture to read the menu with: select the input, then hold ZONE3 SOURCE + STATUS for at least three seconds until4K/8K Format <Enhanced>appears on the display, and change it with the cursor buttons. Some models use ZONE2 SOURCE or TUNER instead, so check your model's manual for the combo. - Yamaha —
4K MODE, set to MODE 1. Note this one is not in the on-screen Setup menu at all: it's in ADVANCED SETUP, which you typically reach by holding STRAIGHT on the front panel while pressing the power button, and read on the front display. Use PROGRAM to move between items and STRAIGHT to change the setting, then power off and on again. MODE 2 is the factory default and it restricts colour space and bit depth — it still passes 4K/24–30Hz at 4:2:2 up to 12-bit, so HDR isn't dead in MODE 2, but 4K/60Hz HDR is. - Onkyo — newer models (TX-NR7100, TX-RZ50) have
HDMI 4K/8K Signal Formatin the menu with an 8K Enhanced option. On older TX-NR models it is usually a front-panel combo: hold BD/DVD and press Power. Older TX-SR receivers behave differently again — see TX-SR606, 607 and 608 no-signal fixes. Check your manual — the combo differs across the range.
- Denon and Marantz — the setting is
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Set the matching mode on the TV input. Enhanced on the receiver and standard on the TV still blanks. LG calls it HDMI Deep Color, Samsung Input Signal Plus, Sony Enhanced format. It is per-input on all three.
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Use a Certified Premium High Speed cable at minimum on both hops. Denon and Yamaha both specify Premium High Speed as the floor for Enhanced/MODE 1. Certified Ultra High Speed is the safer choice. Both hops matter, Apple TV to receiver and receiver to TV.
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Power-cycle in order. Unplug all three for at least 30 seconds, then power the TV first, the receiver second, the Apple TV last. Capability information travels up the chain, not down: the receiver reads the TV's EDID and then presents its own EDID to the Apple TV. Boot the receiver before the TV and it has nothing to read, so it hands the Apple TV a stale or reduced capability list.
If the picture returns but HDR or Dolby Vision doesn't
Run Settings > Video and Audio > Check HDMI Connection on the Apple TV. It's a two-minute test and the screen goes black for several seconds partway through, which is expected. It reports what the current chain actually negotiated, which is faster than guessing.
If it reports less than you expect, the receiver is the constraint. Confirm Enhanced is set on that specific input — it does not apply globally — and check for a receiver firmware update, since HDR format support has been added by firmware on several Denon and Onkyo generations.
The 4K120 dead end
If you've been chasing a 120Hz black screen on the Apple TV specifically, stop: Apple TV 4K does not output 4K@120Hz. The 3rd-gen box has an HDMI 2.1 port, but tvOS has never enabled 4K120 or gaming VRR. Its ceiling is 4K@60Hz HDR. A 120Hz blanking problem through a receiver is a console problem, not an Apple TV one.
One nuance, since it confuses people reading spec sheets: the 3rd-gen box does support QMS, Quick Media Switching, which is built on the same HDMI VRR mechanism. That's what removes the black-screen blink when content changes frame rate. It is not refresh-rate VRR for gaming, and it doesn't get you 120Hz.
Worth knowing while you're in there: the Atmos the Apple TV receives is lossy — Dolby Digital Plus with JOC — and it never outputs Dolby TrueHD. What it sends over HDMI is often Dolby MAT, an uncompressed PCM carriage of that same stream, rather than DD+ passed straight through. Either way the ceiling is set by the source, so if your receiver's display never shows TrueHD from the Apple TV, nothing is broken.
When it's actually hardware
Connect the Apple TV straight to the TV. If the picture is clean, the receiver or its cable is at fault and the settings above are where to look. If it still blanks direct, the Apple TV or that TV input is the problem, and you've eliminated the receiver in thirty seconds.
One more: receivers often have only a subset of inputs at full bandwidth. If Enhanced mode won't stay on for a particular input, it may not support it — move the Apple TV to the input the manual lists as 4K/HDCP 2.3 capable.
See also
FAQ
Why does my Apple TV black-screen only through the receiver? The receiver's HDMI input is in its standard 4K mode. Set it to Enhanced (Denon 4K Signal Format under Video > HDMI Setup, Yamaha 4K MODE → MODE 1 in ADVANCED SETUP, Onkyo HDMI 4K/8K Signal Format), then match the TV's input setting.
I can't find the 4K Signal Format setting in the Denon menu. On many Denon and Marantz models it isn't there. Hold ZONE3 SOURCE and STATUS on the front panel for three seconds with the input selected.
Does Apple TV do 4K120 through a receiver? No. Apple TV 4K tops out at 4K@60Hz. 4K120 is not supported in tvOS regardless of the receiver.
Do I need an 8K cable? No. Certified Premium High Speed is the manufacturer-stated minimum for Enhanced mode. Certified Ultra High Speed gives headroom, but the certification matters more than the number on the box.