I have jbl encounter speaker, my left speaker is very weak compared to the right channel. I can hardly hear the sound out of the left one.

Check first it is on all functions. If it is then it will be a power amp fault. As the unit has two channels both of which are identical to each other it's possible to check and compare each channel. So in your case the left hand channel parts are your guide to what is right. Compare first visually the two channels. If something looks burnt or damaged or wrong in the right, but it isn't in the left then you will have found the cause.
If everything looks OK, then carry out voltage tests, if you have a meter. Or a sound test. This involves touching with an insulated screwdriver the two channels while the unit is on. Never touch any part that there is only one of. Unless it's an IC and has two channels going in it. You will hear a buzz if it is working or produces sound. Again a good buzz in the left should happen in the same place as the right. When it's load at one point of a part but weak on the other, when it should be a loud buzz then you have found the faulty part.
Please however check first that it's not the headphone socket that is causing the problem. Sometimes the sound will be OK on headphones but not on the speakers. The socket the headphones fit into can cause this.

As power amps are just two amps joined together all you need do is identify the left channel and compare it with the right. Ignore any parts common to both channels. The first thing to do is a visual check. If something looks broken burnt, or odd compared with the right channel then you have probably found the culprit. I suspect you could have a power output failure. It might be that the output devices are separate transistors. They might need to be replaced.
By the way just follow either the internal speaker leads or the connections to locate the right and left channels.

click start control panel sounds and audio devices you can adjust the volume there also select speaker volume you can change your settings there you can also tick in the box place icon in taskbar
hope this helps

swap the wires around to see if the right speaker will give sound on the left channel. If it does, the it's a blown left speaker. If you don't get sound out the right one either, then the left channel ouput has a bad capacitor somewhere in it.

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.

goto your control panel and set which type of speaker you r using
and get proper cable for connectivity to your cpu to speaker
and install matchable audio driver which suited to your hardware

one think you also check for your cpu is that
there are there pin in bihind your cpu one for dedicated to microphone
and other are used to get connected to speakers so let me know what socket pin and color r u using
ok and check correctly for your own knowledge

Its easy. Jus from task bar click on that Speaker Icon of sound. In that you can select the left channel, right channel or both! Keep the pointer in middle and you will get sound in both the channels! Enjoy

check on the speaker software were you can set master volumeetc. check for balance volume .

all of the channel are resonding to the test. but you cant notice it bec 5.1 speakers, each channel are designed to respond to a certain frequecies.  the L/R channel your talking about have the mid-range frequecies so it responds clearly compared to other channels...

 

hope that helps...

You've camped the speakers onto the right channel only. While the balance is on the left unhook one of your speakers and connect to the other channel it will come on the now you should have balanced speakers. Can you come back and tell me if that helped.