Only the right channel working on the amplifier

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.

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

Have you checked the final transistors on that weak channel? They may look fine but may be weak. You can pull them and check them on your multimeter with the diode check and cross it with the data sheet for that transistor.

It's likely there is a fault on the power amp. This is located on the heatsink. A visual check inside the unit might be what you need. Look out for blown parts, bulging capacitors or burnt components. Remember the two channels are generally separate and identical. So identify the two channels. Work back from the speaker sockets if you can't tell. Then compare the left channel parts with the right side components. If it looks odd on the left compared to the right you have found the problem.

The left channel output in the amplifier stage is going out - could be a cold solder connection due to overheating. Check the left channel output of the power transistors solder trace - you can compare them to the right channel stage because they're almost identical circuits.

hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.

It sounds like the preamp section is working but the power amp is not. Look at the power supply section and see if it is getting power to the power amp and if ok check the power transistors or IC.

I would do a volt test one the channel that works, then take the volt on the one that is blown and compare if voltage is lower or none at all you could have burned up a wire or a circuit inside of the amp.

disconnect the cabel of left channel from your amp disconnect the cabel of right channel and put it in place of left channel if the problem goen your problem is in left speaker itself (cabel or speaker).if the problem excit the problem will be in amplifier output stage

More than likely the final amp chip needs replaced,and or may be a cold solder joint on the chip amp. GOOD LUCK
BIGRED