Audio Delay through HDMI 65C715K

by fred344

Since I bought my recent TCL Android TV (65C715K) I have noticed that the audio through HDMI is noticeably delayed by around 150ms or so when playing any content on Netflix, Disney, Amazon Prime, YouTube etc. This applies to all HDMI ports using multiple devices. All my HMDI cables are high speed. Some cables support up to 8K@60Hz Dolby Vision. I stream all of my content through an Apple TV 4K but I I have tried other external devices as well. I don’t have a sound bar so I am just using the TV speakers. Even lower quality feeds are delayed (SDR, 1080p etc) through HDMI only. When playing any content through HDMI there is silence for the first couple of seconds before the audio kicks in and it is out of sync.

NOTE : when playing content through the native apps on the TV, there is NO audio delay and it works perfectly.

Below is I what I have tried but without success:

  • Tried multiple devices on all ports (Now TV stick, Apple TV, Apple TV 4K, Laptop through HMDI, Playstation)
  • Swapped around various cables
  • Restarted the TV and Devices.
  • Restored TV to factory settings and also Apple TV to factory settings.
  • Updated the TV to the latest firmware (v645) and software (Android 9)
  • Updated all my devices
  • Used each audio setting on the TV (PCM, Pass through, Auto and Off)
  • Changed the audio delay slider in the TV settings
  • Tested with Dolby Atmos turned on and off.
  • Wired the TV and external devices to ethernet instead of WiFi
  • Checked that the HDMI ports are set to 2.0

Everything seems to point to a HDMI issue on the TV (either hardware or firmware) when streaming anything through it (I have a 500Mbs broadband connection)

Any Ideas?

Kodi_Fan_Omicron

Sounds like a TV issue if it effects multiple devices, contact TCL to report the issue.

Only real solution is to upgrade to a good quality soundbar or decent AVR that has better Audio/Video sync controls, from personal experience the built-in TV sound controls don't ever work correctly.

A_Tough_Cookie

I have a 55C715 and it’s the exact same thing. Fine on native and out of sync on HDMI. It was fine back in v606 but then I made the mistake to upgrade to v645. Even though I went back to v606 it is still out of sync. There is no true factory reset on the TV, it’s always going back to the last firmware used. I plan to contact TCL since it’s still under warranty. We’ll see ..

NOOSE12

Did you ever find a solution?