N1K0L4 Posted January 15 Posted January 15 So I just finished installing a set of PU lights in my MOC when I saw that one LED wasn't working. After closer inspection I noticed that there were bare cables right on the exit from the black box between the connector and the LEDs. Than with help from a slim flat head screwdriver I managed to open the black box. There I saw the 2 bare wires crossing each other which I think shouldn't be happening. After I untangled the wires everything worked again. (I'll protect them properly later) It was interesting to finally see what was hiding in that black box as it was always in the way of something. I thought you guys would like to see it too :) Quote
LabManager Posted January 16 Posted January 16 It's very interesting to see that the PCB was designed by LEGO in 2015, while the PUP lights (88005) were introduced only in 2018. Do you have a bigger picture of the board? Does the black 6-pin chip have any code on it ? Quote
Aurorasaurus Posted January 16 Posted January 16 14 minutes ago, LabManager said: Do you have a bigger picture of the board? Does the black 6-pin chip have any code on it ? Its K1t, searching that online yields https://german.alibaba.com/product-detail/QXW-Original-IC-Chips-LMV821AICT-Operational-1601107496432.html, which says that the chip spec is LMV821AICT, whatever that is. Apparently its a general purpose amplifier. Quote
N1K0L4 Posted January 16 Author Posted January 16 32 minutes ago, LabManager said: Do you have a bigger picture of the board? Does the black 6-pin chip have any code on it ? Here you go. It seems to write K1t, KIt or Klt. Quote
LabManager Posted January 16 Posted January 16 18 minutes ago, Aurorasaurus said: Its K1t, searching that online yields https://german.alibaba.com/product-detail/QXW-Original-IC-Chips-LMV821AICT-Operational-1601107496432.html, which says that the chip spec is LMV821AICT, whatever that is. Apparently its a general purpose amplifier. 1 minute ago, N1K0L4 said: Here you go. It seems to write K1t, KIt or Klt. Thanks. K1t is a BAV99S switching diode (https://assets.nexperia.com/documents/data-sheet/BAV99S.pdf), which is used a rectifier, so both LED's get turned on when current comes from the hub in any direction. Quote
2GodBDGlory Posted January 16 Posted January 16 PU LEDs have a pinhole in the splitter block? Somehow that slipped past me until now! Quote
idlemarvel Posted January 16 Posted January 16 3 minutes ago, 2GodBDGlory said: PU LEDs have a pinhole in the splitter block? Somehow that slipped past me until now! Yes it's used in the green and black Express Train set (possibly others) to hold the light cable in place. Very useful. Quote
dr_spock Posted January 18 Posted January 18 Interesting. Looks like the insulation slid off the bare wires from pulling or under tension. Quote
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