We have Mikomi tv, model no. 15L cd250, that is used for PS2 games.
When playing without headphones everything is ok.
When headphones plugged into the tv sound still comes from tv!!!!
As we have 4 of these going at a teens club at a time we definately need help with this.
Assuming that the TV is not very old I'd take it back to Argos (Mikomi isn't a maker it's an Argos own brand.) on the basis that things like that don't go wrong and so the fault must have been their when the TV was new. You should NOT poke around inside a TV if you are not trained as the voltages in there are potentially lethal.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix televisions.