Hi, I have a problem, when pedal is turned on all lights flash and wont work, can you help please?

pedal broken, stuck in closed position

Hi,

When you turn the amp on, does all the tubes light up? please add more info to help you out.

Replace the internal micro switch or just by a new pedal

It sounds like the pots need replacing if re-soldering didn't work. i would take it to a Line 6 authorized service center.

Line 6

If on battery, battery is depleted. If on adapter, connection is probably bad. Often power jack is broken or has bad soldering.

Hello!
I am not positive on this but I would try to clear all of the loops. Try holding the right pedal for about 5 seconds.
If that does not work, hold the right pedal for about seconds while you turn off the unit. Release the right pedal then turn the unit back on.
Hope that helps!

From the user's manual:

The Check light lights when the effect is on. It ALSO is a battery indicator and when it gets dim, you need to replace the battery if you are not using an adapter.

If it won't go OFF when you try to turn it off, then the switch has probably failed or wiring to it has failed. In this case, service is required.

Check all connections including the battery clip if you use a battery, and the adapter jack if you use the AC adapter. Also check you guitar cable connections as the pedal turns itself off if the guitar plugs have a loose connection. Make sure the guitar jacks on the sides are tight and don't need tightening. Any of those issues could cause the pedal to operate sporadically or not at all.
It could also be and IC problem internally on the pedal's circuit board, but before you open anything, check all the connections non electrical issues can occur more often on pedals.

Replace the switch. These "toggling" switches can and do go bad and fail to toggle.

First and foremost , check your signal chain. By that, i mean put the pedal aside, ...just unhook it and take it out of your signal path. Using the same cables , guitar , amp, other pedals - borrow a friends MT-2 if you can get one , and try THAT to see if THAT works , OR any other kind of distortion pedal. If another one works ok , it's YOUR MT-2. Boss pedals are pretty rugged , but sometimes the little actuator (on/off switch) underneath the treadle (where you push your foot down) will become faulty. That's a high-gain pedal - are you using a basic Strat or other single-coil pickup guitar? If so , are you playing close to any flourescent lights? SIngle coils are noisy around those lights. Will cause a hum / buzz if using a heavy dist. pedal. You can check that by moving around as you play.