Whenever I first turn on my system I need to unplug and replug the RCA cable to the left input before this works. Any suggestions?

it appears that the left channel is defective, repair or replace

Determining the Cause of the Problem Let's assume our system has a head unit, a crossover, a two channel amplifier and two door speakers with only the right speaker working (the left speaker is not working). If the door speakers are behind the door panels then we want to make sure the speaker is the problem before removing the panel. We'll work backwards starting with the amplifier and ending at the head unit. Testing for a Speaker Problem With the vehicle and the stereo turned off disconnect the speaker wires for both the left and right speakers at the amplifier. Now connect the left speaker to the right amplifier output (which we know works). Turn on the stereo system and make sure the balance is set to the middle position.If the speaker still doesn't work then the problem is somewhere between the amplifier and the speaker Testing for an Amplifier Problem Now we'll need to see if the amplifier channel is bad. Put the left speaker back on the left amplifier channel and the right speaker on the right amplifier channel. This returns the speaker wiring to its original configuration. Again, with the vehicle and stereo off unplug the RCA cables from the amplifier's input and switch them so the left cable is in the right input and vice versa. Turn on the stereo system. Testing for an RCA Cable Problem For any intermediate components between the amplifier and the head unit follow these steps for each one. We only have a crossover so we'll just do this once. Begin by testing the RCA cables between the intermediate component and the amplifier. Unplug both RCA cables from the intermediate component's output. Now plug the working channel's RCA cable into the non-working side of the crossover. In our case the working channel is the right so plug the right RCA cable from the amplifier into the left side of the crossover. Turn on the stereo system.
If the right channel continues to work then you know the problem is in the RCA cables between the amp and the crossover. esting for a Crossover or Equalizer Problem At the input of the intermediate component (in our case the crossover) flip the RCA cables around (left to right input and vice versa). Turn on the stereo system.
If the right channel continues to work and the left channel continues to not work then you know the problem is in the intermediate component. Replace or repair this component.
If the problem is now in the right speaker and the left speaker works then the problem lies before the crossover. Turn off the stereo system and return the RCA cables to their normal places.
Testing for a Head Unit or RCA Cable Problem Pull out the head unit from the dash so you can access the RCA cables. Unplug both RCA cables from the head unit. Do not disconnect any other wiring. Plug the right RCA cable into the left channel of the head unit. Turn on the stereo system.

If you are using RCA cables be sure that the colored cables go with the corresponding input plugs, after checking the cabling try powering off then powering on your unit. Some units require a quick channel search and setup, which is usually found under the menu option.

I’m happy to help further over the phone at https://www.6ya.com/expert/darnell_06979bec4e109662

Hi,
Here's a solution to see if you have a problem with either your receiver or turntable.
The turntable has 2 RCA's one red for right channel, and one white or black for left channel, which plug into the back of the amplifier.

• Unplug both RCA from rear of amplifier.
• Plug in a cd or dvd player into those inputs on the amplifier, the sound will be lower but it will give you an indication if the amplifier is ok or not.
• If you have sound on both channels left and right then the amplifier is good
• If you still only have sound on left channel, then there is a problem with the right channel input on the amp.
  

• If your amp, is good, unplug the cd /dvd player.
• Put a record on and start playing the record
• Plug the white or black RCA from the turntable into the rear of the amplifier marked left, you should have sound.
• now unplug it from the left and plug in into the right red RCA socket, if you have sound the amplifier is working fine.
• if there is no sound there may be a problem with the stylus cartridge on the turntable
  
• now lets reverse the test
• unplug both RCA from amp.
• Plug the red RCA into the left socket on amplifier, if there is sound, turntable is working fine, if no sound there is a problem with either the stylus cartridge or that red RCA cable.
• now unplug the red RCA from the left side and plug it into the right side socket
  

• if there is no sound there may be a problem with the stylus cartridge or RCA cable.

I hope this helps

MobileJB

Tries tv and cable box unplug,replug it back like about an hour.For the tv resetting itself and the cable box to upgraded it softwares.Go into the tv menu go to Audio SETUP.Go down to audio ressetting,these steps should solved ur problems,but not call ur cable companny replaced the reciever box,it have problems.

try unplugging and replugging the HDMI cable into a different HDMI socket on your TV, if this doesnt work you may need to set the input to HDMI for your audio on your TV set, (if may be looking at RCA or something for the audio stream), also sometimes its the HDMI cable. try another one if you have another around, this has helped me in the past

Does your sonus system has pre-out? you can directly connect one single rca cable to each output into the speakers. make sure, each speakers is set to left and right each channel. these switches can be found above the rca input of the beolab 8000 next to the power link input. You have to understand that by using powerlink source cable is ideal only for other bang&olufsen equipments......however, there are other options, if u don't have a pre-amp output of your amplifier, you can also modify the speaker out of the amp, thru a conversion cable available from bang & olufsen, with an rca cable left and right channel, without interfering with the powerlink.

on the back of the t/v connect RCA cables to the audio out (right-left) then plug the other end of the RCA cables to the input of your reciever or amp ( t/v input-aux input-vcr input any of the inputs will work but DON"T use the phono input!!

Hmm. let me see if I get U correctly. you use u'r theater system with a TV and the audio is fed via optical or U have DVD player that you can feed the audio via optical or coax. I think it is the later, if it is U could be having trouble with sound decoding setting of the DVD player itself. It's like mpeg out or PCM out instead of full DTS or 5.1 dolby digital decoding. If this is the case just use u'r dvd remote and check the audio play back settings. If this does not solve u'r problem, pls state u'r set up briefly, so tht I can understand the type of connection u use. Happy troubleshooting Rifaa