Sounds like the board is bad but I'l look for other wires disconnected. Check the rectifier assembly (aluminum plates with the diodes on them). There should be 2 small wires that run back to the PCB.
Had a look at the rectifier and there was a loose wire on it so I soldered it back on and the motor now turns when I press the trigger,but when I turn the wire speed knob the motor doesent alter it stays the same speed
Ok, that would be on the circuit board; most likely a burnt transistor. Unless you are willing to test/repair individual parts on the board; I'd suggest getting a new board.
Stick your meter on the motor connections (meter set on DC volts) and see if there is ANY change in voltage to the motor from one end of the feed control adjustment to the other end. Could be if it's the wrong value of pot that you won't see much of a voltage change. Note back off wire feed roller pressure to avoid wire feeding while checking!
Hi mate I've just done the test you suggested and there was no change in voltage on the motor ,ps the meter didn't show any kind of reading from the motor what so ever is this right thanks
Can't see how the motor can be running if you are not getting any reading on your meter! Meter needs to set to DC volts when metering.
ps in a hotel this week so net access is poooor.
Ok lads I've had my new pcb board but its a different to the old one so I need a hand to tell which way the four wires on
Picture of the front
And a picture of the back
Thanks