| Electronics > Repair |
| Voltage Increase, failed component? |
| (1/7) > >> |
| ajp8868:
Hi All, I'm currently repairing a DJ light which uses two voltages, a 12v and 28v supply. Currently, a couple of the steppers on the 28v side aren't working at all and I've been swapping chips for a few days to no avail. I've just noticed that the 28v side is being pulled up to ~31v. I've checked another unit and it doesn't do this, I've also checked with a known good supply to make sure it's not that either. So I'm a bit puzzled, could this be a shorted component? Any suggestions as to what would cause that? Picture attached of the board. The 28v is the brown wire and supplies the LED circuit, and two of the steppers controllers. Thanks! |
| fzabkar:
Where is the 28V supply being generated? Is it a raw supply, or is it regulated? |
| ajp8868:
Direct from a dual smps, I believe it's regulated... Just for info, I tested the same supply with a working board and it doesn't do it. I also tested another supply with this faulty board and it does the same. |
| fzabkar:
What is the component on the vertical heatsink? FWIW, I notice that one of the 4-pin connectors in the following photos is labelled 24V, Gnd, Gnd, 12V. SHOWTEC SPCI126 PHANTOM 50 SPOT MAIN PCB: https://www.indiamart.com/proddetail/showtec-spci126-phantom-50-spot-main-pcb-2852762037848.html https://5.imimg.com/data5/SELLER/Default/2023/10/356541585/SZ/DP/QW/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541509/RP/GS/XX/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541492/IZ/PO/NW/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541474/RN/TE/TB/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541848/AW/RQ/SG/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541781/HN/SY/UP/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg https://5.imimg.com/data5/SELLER/Default/2023/10/356541666/QJ/QQ/AS/10222995/showtec-spci126-phantom-50-spot-main-pcb.jpg User manual: https://www.farnell.com/datasheets/1518634.pdf |
| ajp8868:
Yes the boards labelled 24 but the PSU supplied in these runs 28 and 12v. It might be that these same boards are used for different lights. That's a 5v regulator and is connected to the 12v rail |
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