how to repair a Remote controller?

Before you throw away your old remote have a try with these tips: First of all remove the panel by using a sharp knife on the sides, come have screws inside the battery chamber.Once remvoed you can find the main board on which is the circuit and the carbon pads. Solder the IC the crystal, the IR LED, the driver out transistor.
make sure the battery voltage goes to the IC and there is no track loss/break.If battery had leaked into make sure to clean well with petrol and insulate after soldering with varnish.
With the battery connected check the voltage on the IC, press a pad and check for the output at IR led.
Now use a IR detector with a multimeter( in Ohms range) to see the voltage change when the remote is pressed.
Now try this on or change the crystal or IC, to get your remote working again.