Question 2: Does the center barrel carry any current. Essentially the coil FL1 is just a jumper, but the nature of coils is to push voltage forward. Sometimes when removed, the previous arcing my had eaten the contacts solder ends, so you would not be completing the circuit. When replacing, you can use an old part from a dead laptop, just make sure it has the soldered ends. So you will need to check the pads, or circuit directly before & after the filter.
Many times you may place the meter leads on the filter 2 soldered ends, but the main pads where the Filter sits has the gap. Question 1: Can you test FL1 in circuit? Yes but the filter may not be the exact problem, it is whether the filter is passing voltage. I would like to know if a continuity test is sufficient to tell if the filter is good, and when you say replace do you reuse the original filter or is it a new part? Also, does the pin in the barrel of the dc plug of the power supply carry any current?
Several questions were asked directly and I will post/answer here so that everyone will benefit. If you get no lights or anything with adapter plugged in- it is usually a failed negative circuit.
If you wiggle the jack with the adapter plugged in and the lights come on briefly it is a failed POS circuit. In picture 2 voltage was checked at pins 1,2,3 to see if voltage reached the MOSFET. The white dots are only Pin 1 indicators or orientation markers. The silver dots on the motherboard in a circuit are test points. If you check the coil only, sometimes you may not have contact to the pad, which is the original problem. Try to test pad contact area and not just the coil. In this case if you cannot find a replacement, you can simply turn the coil upside-down, and make sure you have positive voltage on the circuit. FL1 cannot handel the surge when plugged in and eventually arcs then lose contact with the solder pad. In this instance the laptop was a couple of years old before it failed. Sometimes it may be years before it finally lose contact, other times only months pass. Perhaps eating away at the Filters pad, due to the current it is carrying. From my guess, the solder on the leads of FL1 tend to lose contact after regular use. You can tell by the white and silver cases used. Most of the motherboards use the same general layout and design. This is a common problem with the Dell Inspiron 1501/E1705/6000 series.
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