My 4 months old Marshall Woburn speaker won't turn on? What can be wrong with it and when're can I get it fixed ? Worked fine yesterday

you have an open on your speaker bridge circuit

1. probably a resistor or, capacitor check with a multimeter

try another speaker or test the speakers on another amp. if the speakers are working then it's your amp . check out the output ic's. they maybe blown.

Something similar happened to me a while back,

Check your fuses, some amps have 2 fuses on the back and it sounds like your second one might be blown.

If its not that, then it is probably the amp module and you will probably have to take it for repairs. Be careful if you open it up yourself, sometimes the amps can hold residual charge and there is a danger of getting zapped.

Hope this helps!

this is a electronic problem. there must be a capacitor/s in the output section that's swollen and will keep giving the same problem unless its replaced.

G.

probolly all you did was run a head into another amp and just caused your marshall to overheat/overpower and blew your output transistor. i you drop the chassis out and look at the chip on the heatsink is it blown? also check all internal and external fuses.

There are many models of Marshal amps icluding 15Watt types.

First thing to try is to see if headphones have normal volume. If they do, then the headphone jack switch that connects the speaker is LIKELY bad.

If the headphones do not have any volume, LIKELY causes are:

1. Fried output power amp

2. Volume pot is broken or has bad solder joints to the circuit board.

Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.

If you connected an external speaker plug from one into the same type plug on another amp, you have driven signals backward into the amp that was off... NOT into the speaker in that unit.

The usual result is blown parts in the amp that is off.

Some amps have their own speaker cable that you can unplug to connect to another amp and that is fairly safe. NEVER run an amp without a speaker load on it.

Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.