Home Theater Troubleshooting: No Sound, No Picture, HDMI Issues & Remote Problems

Common Symptoms

• TV shows 'No Signal' when switching to home theater input
• AV receiver powers on but no audio from any speaker
• Subwoofer is connected but produces no bass
• HDMI 4K or HDR content does not display correctly
• Remote control buttons have no effect on TV or receiver
• TV picture is visible but all audio comes from TV speakers instead of receiver
• Streaming device (Roku, Apple TV, Fire TV) is not recognized by receiver
• Audio cuts out intermittently or drops to silence during playback

Most Likely Causes

1. 1

   HDMI Handshake Failure (Most Common)

   Modern HDMI connections perform a digital handshake (HDCP authentication) between source, receiver, and TV every time a device powers on. If any device in the chain takes too long to respond or sends a mismatched signal (especially with 4K/HDR content), the handshake fails and the TV shows 'No Signal.' Unplugging and reconnecting the HDMI cable forces a fresh handshake and resolves the majority of no-picture complaints.

2. 2

   AV Receiver Protection Mode

   AV receivers have built-in protection circuits that shut down audio output when they detect a fault: speaker impedance below rated minimum (4-ohm speakers on an 8-ohm-minimum receiver), a shorted speaker wire, or an internal temperature fault. The receiver may show a solid or blinking red light labeled PROTECT. Protection mode is a safety feature — it protects the output transistors from damage and must be cleared by addressing the root cause.

3. 3

   Incorrect Input Selector

   AV receivers route audio and video independently from a specific input. If the INPUT selector on the receiver does not match the physical port where the source device is connected, the receiver outputs silence while the TV may show a picture (if connected directly via HDMI ARC). This is one of the most common causes of 'TV has picture but no sound from speakers.'

4. 4

   HDMI ARC Misconfiguration

   HDMI ARC (Audio Return Channel) sends the TV's audio output back through the same HDMI cable to the receiver. For ARC to work, three conditions must all be met: the TV's audio output must be set to 'External Speakers' or 'ARC,' HDMI ARC/CEC must be enabled on both TV and receiver, and the physical cable must run between the TV's ARC-labeled port and the receiver's HDMI OUT (ARC) port. Missing any one of these silences the receiver.

5. 5

   HDCP 2.2 Authentication Failure (Streaming Devices)

   4K streaming content is protected by HDCP 2.2, which requires every device in the HDMI chain — source, receiver, and TV — to support HDCP 2.2. If any device in the chain does not support HDCP 2.2, the content protection system refuses to display the signal. Power-cycling the streaming device and running its built-in display reset resets the HDCP handshake and resolves most streaming recognition failures.

6. 6

   Subwoofer Connection or Level Error

   A subwoofer that produces no bass is almost always a configuration issue rather than a hardware fault: the LFE/SUB output cable is not connected, the subwoofer's own POWER switch is off, the VOLUME knob is at zero, or the receiver's crossover frequency is set so high that all bass is redirected to the main speakers instead of the subwoofer channel.

7. 7

   IR Sensor Interference

   AV receiver and TV IR sensors can be overwhelmed by strong ambient light — direct sunlight, bright halogen lamps, or LED lights positioned near the sensor. This causes intermittent or complete remote control failure even with fresh batteries. The smartphone camera test (point the remote at the camera and press a button — you should see a purple flicker) confirms whether the remote is transmitting even when the device is not responding.

8. 8

   Loose Speaker Connections Causing Dropout

   Intermittent audio dropout is often caused by loose speaker wire connections at the receiver's binding posts. A strand of bare wire shorting two adjacent binding posts is one of the most common triggers of receiver protection mode. Spring-clip binding posts require the wire to be fully inserted; banana plugs must click completely into spring-loaded posts.

Quick DIY Checks

1. 1Fix HDMI handshake failure: unplug the HDMI cable from both ends — at the TV and at the AV receiver (or source device). Wait 30 seconds, then reconnect. Also try a different HDMI port on the TV. If the TV continues to show 'No Signal' after reconnecting, swap to a known-good HDMI 2.0 cable rated for 18 Gbps bandwidth — required for reliable 4K/HDR signal transfer. Covers handshake failures between AV receivers and TVs from Denon, Yamaha, Sony, Onkyo, and Marantz.
2. 2Clear AV receiver protection mode: check the front panel indicator — a solid red or blinking red light labeled PROTECT or STATUS indicates a protection fault. Unplug the receiver from the wall outlet for 60 seconds to clear the fault latch. On Denon and Marantz receivers: hold the POWER button and the MASTER VOLUME knob simultaneously during startup to force-clear protection lock. On Yamaha receivers: verify the YPAO microphone has been removed after calibration — leaving the YPAO mic plugged in during normal operation can trigger protection mode on many Yamaha RX-A and RX-V series receivers.
3. 3Restore audio from speakers: verify the INPUT selector on the receiver matches the HDMI port number or input label where your source device is connected. If you connected a Blu-ray player to HDMI 2 on the receiver, the INPUT selector must show HDMI 2 (or the custom label you assigned to that input). Also check speaker impedance: 4-ohm speakers connected to a receiver rated for 8 ohms minimum will trigger thermal protection (amber PROTECT light). Run the receiver's automatic room calibration — Audyssey (Denon/Marantz), YPAO (Yamaha), or AccuEQ (Onkyo) — to recalibrate all channel levels and speaker distances.

1. 4Fix subwoofer producing no bass: check the LFE/SUB output cable on the receiver — it should be a single RCA mono cable running from the receiver's SUB OUT or LFE port to the subwoofer's LFE IN or LINE IN jack. Verify the subwoofer's front-panel POWER switch is on (not just the standby LED). Confirm the VOLUME knob on the subwoofer is turned up above zero. In the receiver's speaker setup menu, set the crossover frequency to 80 Hz for most satellite or bookshelf speaker systems. If the subwoofer has a PHASE switch or knob, try both 0° and 180° — the correct setting is whichever position produces fuller bass at the listening position.
2. 5Fix remote control not responding: replace the batteries with fresh alkaline cells (not rechargeable — voltage is slightly lower and can cause intermittent issues). Clean the IR sensor window on the front of the TV and receiver with a dry microfiber cloth. Check whether a bright light source — a window, a halogen lamp, or a bright LED floor lamp — is positioned near the IR sensor and washing out the signal. Confirm the remote is transmitting: point the remote at a smartphone camera (front or rear camera) and press any button. If the remote is working, you will see a purple/white flicker in the camera viewfinder. No flicker means the remote has failed; visible flicker with the device not responding means the IR sensor is blocked or has failed.
3. 6Restore audio through ARC/eARC: verify the TV's audio output setting is set to 'External Speakers,' 'Audio System,' or 'ARC/eARC' — not 'TV Speakers.' This setting is usually found under TV Settings → Sound → Sound Output. Enable HDMI ARC on both the TV and the receiver (settings vary by brand — look for 'HDMI Control,' 'Anynet+' on Samsung, 'BRAVIA Sync' on Sony, or 'Simplink' on LG). Confirm the physical cable is connected correctly: the TV's ARC-capable HDMI port (labeled 'HDMI 1 ARC,' 'HDMI 2 ARC,' or similar) must connect to the receiver's HDMI OUT (ARC) port — not to any of the receiver's HDMI input ports.
4. 7Fix streaming device not recognized by receiver: power-cycle the streaming device by unplugging it from power for 15 seconds. On Roku: navigate to Settings → TV connected to → Auto-detect to force a fresh display type and HDCP handshake reset. On Apple TV 4K: go to Settings → Video & Audio → Change Format → Reset Video Settings — this clears the stored HDCP 2.2 authorization and forces re-authentication. These steps resolve most HDCP 2.2 authentication failures for Roku, Apple TV, Fire TV, and Chromecast devices.
5. 8Fix intermittent audio dropout: check all speaker wire connections at the receiver's binding posts — hand-tighten each post and confirm the wire is fully inserted. Banana plugs should click firmly into spring-loaded posts. Look carefully for any individual strands of bare copper wire crossing over to an adjacent binding post — a single stray strand shorting the positive terminal of one channel to the negative terminal of the adjacent channel is a common cause of protection mode activation. If using an optical (Toslink) cable for audio: inspect both cable ends for dust or debris inside the connector — a soft puff of air into each end clears most dropout-causing contamination.

Repair vs Replace

Recommended Tools & Parts

• HDMI 2.0 Cable — 18 Gbps, 6 Foot

  High-speed HDMI 2.0 cable rated for 18 Gbps bandwidth — required for reliable 4K/HDR signal transfer. Resolves HDMI handshake failures caused by cables that are rated only for 1080p (10.2 Gbps). Choose 6 ft for most AV rack setups.

  $8–$20

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• HDMI 2.1 Cable — 48 Gbps, 6 Foot

  Ultra-high-speed HDMI 2.1 cable rated for 48 Gbps — required for 8K video, 4K/120Hz gaming, and eARC audio. Backward-compatible with HDMI 2.0 devices. Use when connecting a PS5, Xbox Series X, or eARC-equipped soundbar.

  $12–$30

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• Universal Remote Control — Replacement

  Programmable universal remote compatible with most AV receivers, TVs, Blu-ray players, and streaming devices. Use when the original remote has failed the smartphone IR camera test (no purple flicker visible). Logitech Harmony and GE universal remotes are the most widely compatible options.

  $15–$50

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• Optical Toslink Cable — 6 Foot

  Replacement optical audio cable for connections between TV and AV receiver or soundbar. Intermittent audio dropout is often caused by dust in the Toslink connector ends — replace if cleaning does not resolve the issue.

  $8–$15

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.