Question re: hum on the output of the vcr/dvd sys


Nov 14, 2013
The vcr/dvd recorder combo is a Funai model ZV427FX4. There is hum (not very loud) and the volume is lower in the tv as appose to when the tv is connected to the cable tv DVR via the HDMI cable. And there is no hum via the HDMI cable. I have a portable dvd player with it's own screen. When I play DVD's that I recorded off the DVR, there is no hum in the recording. But when I play the same DVD in the VCR/DVD sys the hum is there. The hum is there when I play commercially made dvd's or vhs tapes. I have checked all of my cables with a VOM. All the cables are fine. I have a drawing of my sys layout. Here is the Dropbox link sys layout.jpg?dl=0
PS: I have the 3 lead video/audio switch on the VCR/DVD output for testing other dvd players and other things. I am currently working on a Commodore Amiga A500 sys. The A500 only has video and stereo out. No RF out period.
Last edited:
The portable DVD player may not go low enough in frequency to reproduce the hum which would likely be at 50 or 60 hz depending on the country.
If the VCR/DVD has a three prong AC cord you can use 3-2 AC adapter to lift its' ground.
You could try to isolate the AV output of the VCR/DVD player with an audio transformer. You might need a composite video isolation transformer too.
Eliminate the AV switcher as well just to rule that out.
If you can connect another DVD player to the TV that will help determine if the VCR/DVD has a problem or if the system has a ground loop issue
Thread starter Similar threads Forum Replies Date
blue_duck Streaming Video & TVs 6
C Streaming Video & TVs 5
alphacoyle Streaming Video & TVs 3
rad07 Streaming Video & TVs 2
Mahan2210 Streaming Video & TVs 6
Pdbonlucas Streaming Video & TVs 3
D Streaming Video & TVs 1
hiAnsh Streaming Video & TVs 1
Gimibihi Streaming Video & TVs 1
G Streaming Video & TVs 1
Fluffy4000 Streaming Video & TVs 2
J Streaming Video & TVs 1
Jongwell Streaming Video & TVs 5
J Streaming Video & TVs 2
S Streaming Video & TVs 2
A Streaming Video & TVs 1
A Streaming Video & TVs 2
A Streaming Video & TVs 5
B Streaming Video & TVs 1
D Streaming Video & TVs 3
Similar threads
Question My projector only shows green when an HDMI output is connected to the projector's VGA input
Solved! OTA Audio with No Output On TV
Solved! Would I get better audio quality running my htpc thru a hdmi to hdmi+optical output vs the 3.5mm jack to av rca inputs on receiver like I'm doing now?
Question Get TV output from a local TV channel 998 showing Lobby camera of a condominium building and stream it to iOS SIP/VOIP application
Solved! Modern TV's with Video Output?
Question Converting HDMI Output to Optical DVD input
Question HDMI Switcher output resolution changes to 1920 thereby cutting off audio
Question My Logitch Z506 aren't outputing sound to the rear speaker
Question How do I get audio output from an Optoma gt1080darbee with an AppleTV?
Question Problems getting new Blu Ray player to output to receiver
Question Best setup for Wireless HDMI + HDMI Switch (2 Inputs -> 2 Outputs)
Question Low optical output from LG TV -> JBL SB450 results in short mute
Solved! I have a lg TV dosnt have output I want to connect some pa speakers what can I do?
Unsupported signal check your device output
How Can I Connect headphones to an LG 32LJ500B TV with no audio output?
how to gate sound output for sony projector for connect hdmi cable for laptop
Solved! Can I connect a PC with VGA output to a TV with RBG Phono inputs?
split optical audio output or split converted analog output
Duplicating output from smart tv streaming