Speakers woofer plays some times and sometimes only trweeter speaker plays

Have you checked first off that if you put the speaker on another channel it is still playing up?
Assuming it is the speaker that is playing up there are a few possible explanations for it. First that the woofer is faulty, a rip in the material or damage to the cone. Especially if it was played too loud or connected to the wrong sort of amp for it.
The next problem is the crossover circuit. It could contain semi-conductors (transistors, IC, etc) that can short out or play up. Another fault could be bad internal connections. Or breaks on the PC board of the crossover. Speakers sometimes get knocked over and the shock can cause a break on the circuit board.

Check the back side of the woofer. they are frequently designed with protection fuses to prevent failure.

The tweeter is working but the woofer driver isn't which will change the impedance (ac resistance) of your amplifier output. The other speaker isn't working which will again, change the impedance even more. This could eventually damage the I.C. amps should you apply too much volume to the speakers.
You can turn the volume up to normal listening level and with your finger, slightly press the cone on the woofer in and out a couple of time. Does it engage in sound when you do this? If so, the woofer's coil is damaged and the woofer must be replaced. No sound? Open up the speaker (stereo off) and make sure both wires are fully secured to the woofer. Should they be attached securely, your woofer is probably defective. Should you have a crossover network, you can obtain a good, known working woof and temporarily wire it where the old woofer goes, turn on your stereo (minimal volume) which can verify the network pcb (crossover) is working.

The problem is not with the speaker oputput connectors but the opuput socket where you are connecting the speakers. The socket needs to be re-soldered / removed and a new one soldered in the same spot.

ok, your amp is in protect mode. either the speaker wires are crossed and shorting out, your woofer's vioce coils are melted and the speaker is blown or the amp is dead.

to determine if the speakers voice coils are melted, and thus the speaker being blown is the reason for the "protect" light, simply push in the cone of the woofer in gently with your hand. the woofer should move a little more than an inch, without any resistance, before bottoming out. if there feels to be any resistance, like a rubbing or scratching, before the woofer bottoms out, then your voice coils are fried, and you need a new woofer.

Check you have plugged them into the correct socket on the back of the PC ..

Chances are you have 3 sockets - first = 'front' (or pair), middle = 'back' (for 4+ speaker sets) and last = 'center & sub-woofer' ..

Sounds like you have plugged into the 'center & sub-woofer' socket :-)

Your amp is going into protection. The click you hear is a relay meant to protect your speakers and stereo. Check your speakers with an ohm meter for the the proper ohms ( listed on the speaker ) and physically try to push each woofer and midrange cone in gently to make sure it moves and is not stuck or frozen in place. A speaker may read correctly on an ohm meter if the woofer is ok but if the tweeter or midrange is not working it will cause the amp to go into protection mode. When you play music stick your ear up to each tweeter\midrange\woofer to ensure they are working.
Your stereo could also be the culprit although usually if it plays music it is ok as long as you are not hearing loud pops. Loud pops are voltage spikes that indicate that a transistor\IC is breaking down and will eventually short. Good luck!

barneyluc

The problem is most likely the amplifier circuit. It is probably over-heating and the speaker relay is turning off. it is not likely that it can be diagnosed properly on an online forum, since it takes some troubleshooting to be certain of it. Does this system have the amplifier built into the sub-woofer? If I had the model number I could probably give you much better advice, not all home theater systems have the exact same problems. Each different model of every brand have there own unique problems specific to that model number. There are some universal problems, but this is not one of those easy to figure out universal type of problems. I work at an authorized Samsung service center and have experience with repairing these type of systems, so if I were to get the model number I could offer you a better solution. But it is likely that it will need to be serviced to determain the exact problem. A couple of the Samsung home theater systems that have the amplifier in the sub-woofer must have the entire sub-woofer replaced because they do not offer the parts and service data needed to do a component level repair.

One way to determain if the sub-woofer has the amplifier built into it is if all the speaker wires for the sattelite speakers all connect to the sub-woofer.

Sometimes a bad speaker can cause the amp to get hot and shut down, you can check these very easy yourself.

First, while the system is turned off, disconnect one speaker. Any speaker is OK to start with. After one speaker is disconnected, turn on the system and play it at medium volume. If the system stays playing and doesn't turn off the speakers as it did before, the speaker that is disconnected is probably bad. Take it to a service center and get it checked to be certain. Most service centers will do this for free as a courtesy to their customers, it only takes a minute to check.

If the system turns off as it did with all speakers connected, you then need to reconnect that speaker and disconnect one of the other speakers and go thru the proccess again. Make sure to do all of the speaker connecting and disconnecting while the system is turned off.

If you end up disconnecting all the speakers one at a time and the system still shuts off, it could be that the sub-woofer speaker is bad or the amplifier is bad.

If you can give me the model number of your system, it would help.

Dave

if the amp is going bad repair or replace, the sub you would probably have to replace, this would be the best fix. but check the amp also.good-luck!

A quick quess of mine is the following:

The OVERLOAD indicator lights up when the receiver is maxing out on the current it is sending to the speakers. My guess is there is possibly something wrong with the receiver itself, especially since the B speakers won't play. Either that, or something is broken in your speakers or you are using a set of speakers that have too low an impedance rating for your receiver.