SUBJECT: Failure of the dish motor.
SYMPTOM: The LED motor lights but the dish/motor will not turn.
CAUSE: No power to the control circuitry.
EXPLANATION: For the antenna cable running from the decoder to the motor and dish are two signals, the high frequency of the LNB and feeding + / -15 (14/18)VDC feeds the control circuitry and the motor.
The two feeds are spread across the coil L1. This does not pass the high frequency signal (behaves like "open circuit" at high frequencies) but lets the DC no problem.
In this case, because moisture has entered the interior of the motor housing, the coil(bobina) has rusted. The rust has eaten up the copper up to cut the cord, preventing the passage of current to the control.
REPAIR: As we do not know the inductance of the coil, you can not buy a new one. We must repair the defective coil. The coil is cut by a loop near one end. Desoldering nearest end and remove the piece of copper excess, this means removing a few twists/turns, but functionally not affected. Solder the copper end (where it was cut) to pin the coil that is free ,check with the multimeter and you´ll find that between ends of the coil resistance is practically zero. Again the coil is soldered on the card. The engine will run correctly.
Before closing the casing ,there is a spray sold in most decent electrical stores that will "waterproof" the circuitry then seal with silicon the casing ensuring waterproofing ( in this case it was humidity not rain that caused the oxidation( rusting))
NOTE: this is only one possibility of motor failure.
BOBINA = COIL
This is the internal image of an ilusion motsat3 motor ( I imagine most are similar)
