| Electronics > Repair |
| Need help deciphering inductor label on laptop schematic to find replacement. |
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| JeffBloomgold:
Hello! I'm attempting to repair a fault in a Dell Inspiron 5770 motherboard which prevents the battery from charging or the laptop from running off of battery. I've found a very obviously blown inductor and found a schematic to see what I need to get to replace it with. However I have a few questions on how to decipher its label in the schematic (see attached image of the battery circuit schematic - it's PL4 in that image.) It's labeled as "5A Z150 20M 1210_2P" 5A is 5 amps and I assume it's the rated current but didn't know if it might be the current saturation. Z150 is something I have no idea about. I found one seller of SMD inductors that has this Z150 as part of its model number/marking and assume that's probably all it is, but was hoping to get some clarification. 20M: Not sure if this is 20% tolerance or if it's an inductance value of 2.0uH? If it's the latter, what is the M for. If it's the former, what is the inductance value? 1210: type of case 2P: No idea what this means Also after a bit more reading, it looks like Z150 might be in reference to impedance and 20M in reference to frequency? Is there some way to tell what kind of replacement I need to get if so? Thanks all! |
| fzabkar:
--- Quote ---see attached image of the battery circuit schematic --- End quote --- I don't see it. |
| JeffBloomgold:
Hmmm looks like I goofed and forgot to attach it. Here it is. I also attached an pic of the motherboard/inductor itself. Edit: Also, is this actually a ferrite bead? |
| helius:
2P means it is a "2 pin" device with two terminals. Many EMI suppressing "inductors" are actually chokes with 4 pins. Ferrite beads are one kind of inductor. The other type is made of wire wound around a bobbin inside a piece of iron or ferrite. 5 A current is quite high for a 1210 case device, it may be difficult to match that. Look at the Würth Elektronik 742792312: 1210 case, 0.03 ohms at DC, 110 ohms at 1000 MHz, 65 ohms at 100 MHz. 3000 mA DC current. |
| JeffBloomgold:
I also found this one Helius: https://www.mouser.com/ProductDetail/Fair-Rite/2512061217Y5?qs=paL1wOLBYNdLzI%2FVPVZ0Rg%3D%3D Package / Case: 1206 (3216 metric) Impedance: 120 Ohms Maximum DC Current: 5 A Tolerance: 25 % Maximum DC Resistance: 20 mOhms I figure the size of the case is close enough to work but I wasn't sure how close to the original values I need to get in order for it to work well. I'm a bit of a newb if you couldn't tell ;D |
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