Electronics > Repair
Need help deciphering inductor label on laptop schematic to find replacement.
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fzabkar:

--- Quote from: JeffBloomgold on June 23, 2024, 01:31:21 pm ---It's labeled as "5A Z150 20M 1210_2P"

5A is 5 amps

Z150 / 20M: --> 150 ohms reactance at 20MHz

1210: type of case

2P: 2-pin ??
--- End quote ---

https://www.analog.com/en/resources/analog-dialogue/articles/ferrite-beads-demystified.html
cruff:
Have you checked all of the chip capacitors attached to the battery input line for shorts?
JeffBloomgold:
Not yet no, but I plan to do that before I hook it back up to power.

Thanks everyone for your help!!! The plan now when I get a bit more time is to check to see if any of the capacitors are shorted and if not, short the pads from the burned out ferrite bead and see if that restores function - then worry about finding a suitable replacement.
JeffBloomgold:
Ok so none of the capacitors are shorted but would I be correct that 3 of them seem to be missing?? At least when comparing the boardview with the actual motherboard? Or am I missing something basic?
T3sl4co1l:
They probably mean 5A rating, 150 ohms impedance at 20MHz, 1210 chip size, multilayer ferrite chip bead.

It's an odd choice as a bead that size (fairly high impedance at lowish frequency) is likely saturated under most any kind of load (100s mA).

Hard to say how well it was designed/chosen, or added out of superstition without actually validating its effect.

Missing components appear to be DNP ("Do Not Place"). The solder joints look reflowed as-is, nothing broken off.  Often, a board is fully soldered (solder paste spread everywhere it might possibly be needed) and component placement is left off as needed.  Presumably they simply didn't need every capacitor in those locations.

Tim
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