The EM10 charging filter is located next to the power connector on the motherboard.

If the filter is missing or obviously broken, move on to STEP 18

Use a multimeter to test the EM10 filter - measure the resistance between each of the yellow solder pads, and then between each of the cyan solder pads. If everything is OK you should have close to 0 Ohms between each set of pads. You should NOT have any connection between the cyan pads and yellow pads. If the filter fails either test it needs to be replaced.