| Electronics > Repair |
| [Solved] Repair of SMPS - Help request to identify blown TOP2?? in a SMPS |
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| mariush:
--- Quote from: MrBeams on May 08, 2024, 06:09:36 pm --- "if it's a smal smps psu block, is it possible to change it for another one / other brand ..." This would be impractical due to space constraint and the fact that it's not just a PSU. There are other boards sat above this one that plug into the PSU board. It's not just a PSU board, that being said, the PSU occupies one half of the total board. Thank you. --- End quote --- Technically, you could simply desolder the transformer and optionally other parts like the input filtering and you can solder the DC output of a power supply directly to the output capacitors You just need to figure out the output voltage - it will be lower than the rating of those two tall capacitors on the top right... I'd expect to be something like 20-25v. All that's in the red is on high voltage side ... to the left of the yellow line it's just mains filtering, and a fuse by the power connector. You could desolder them to make room for a third party power supply. If you power the board with DC from separate power supply, you can unscrew and desolder the switcher IC, the transformer, and the diodes on the right side heatsink as well. Example of power supplies that could possibly fit inside that space : https://www.digikey.com/en/products/detail/fsp-technology-inc/FSP080-P24-A24/13240546 (24v 80w ) or https://www.digikey.com/en/products/detail/fsp-technology-inc/FSP080-P24-A12/13240474 (12v 80w) or 15v 85w https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-120-15/7706020 and lots of laptop adapter style external power supplies are available as well (you could just replace the AC power connector with a barrel jack connector. |
| MrBeams:
--- Quote from: coromonadalix on May 09, 2024, 02:04:14 am ---you can for tests but put a new / order a new one with the same value .... i've seen some forums with this brand, capacitors failures are reported a lot ? --- End quote --- Yes you are correct, the new one that I have is 150uF and the one that has failed is 180uF. It does appear that Bluesound has used caps that are prone to failure across their range of products, the Node 2 & 2i have a high failure rate due to PSU caps failing. Different forums also suggest the premature failure is likely due to heat but I don't have an opinion on that. Thanks for helping. |
| MrBeams:
--- Quote from: coromonadalix on May 09, 2024, 02:04:14 am ---you can for tests but put a new / order a new one with the same value .... i've seen some forums with this brand, capacitors failures are reported a lot ? --- End quote --- Understood, I'll source the correct value one from a reputable manufacture, with as high a temperature rating as I can find. Thanks. |
| MrBeams:
--- Quote from: mariush on May 09, 2024, 09:03:41 am --- --- Quote from: MrBeams on May 08, 2024, 06:09:36 pm --- "if it's a smal smps psu block, is it possible to change it for another one / other brand ..." This would be impractical due to space constraint and the fact that it's not just a PSU. There are other boards sat above this one that plug into the PSU board. It's not just a PSU board, that being said, the PSU occupies one half of the total board. Thank you. --- End quote --- Technically, you could simply desolder the transformer and optionally other parts like the input filtering and you can solder the DC output of a power supply directly to the output capacitors You just need to figure out the output voltage - it will be lower than the rating of those two tall capacitors on the top right... I'd expect to be something like 20-25v. All that's in the red is on high voltage side ... to the left of the yellow line it's just mains filtering, and a fuse by the power connector. You could desolder them to make room for a third party power supply. If you power the board with DC from separate power supply, you can unscrew and desolder the switcher IC, the transformer, and the diodes on the right side heatsink as well. Example of power supplies that could possibly fit inside that space : https://www.digikey.com/en/products/detail/fsp-technology-inc/FSP080-P24-A24/13240546 (24v 80w ) or https://www.digikey.com/en/products/detail/fsp-technology-inc/FSP080-P24-A12/13240474 (12v 80w) or 15v 85w https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-120-15/7706020 and lots of laptop adapter style external power supplies are available as well (you could just replace the AC power connector with a barrel jack connector. --- End quote --- Thank you for such a detailed reply mariush, it is appreciated. The hyperlinks you've provided are a good place to start. That could be the way to go if I fail to repair the unit, I certainly like the sound of the external PSU option. |
| MrBeams:
So things have progressed with my original aim which was to identify the failed switcher IC. The front face of the IC had suffered considerable damage where it had blown making it impossible to determine the exact type of IC other than being able to read TOP2. I tried cleaning the face with various cleaning solutions to no avail. As a last resort I asked a friend to pop it in his small ultrasonic cleaning bath, wow what a revelation, I could now clearly read the second number using a loupe and could pretty much make a good stab at the third, revealing TOP271. Using Power Integrations datasheet for the IC type I'm able to determine that it can only be one specific TOP271 IC due to the package type, namely a TOP271EG :) . The power rating fits well with the speakers information plate. Next step is to order that device and the correct cap and take it from there. Looks like the components will be around £7.00 but the handling/carriage will be £12.00 :( , however this would be a small price to pay considering the speaker is around £490 retail. I would like to take this opportunity to thank all the forum members who tried to help me, I really do appreciate it. As a first post in this type of forum I also learnt a lot about what information is expected from me when making a cry for help and hopefully it will help me improve in the future. It also helped me think outside the box too. Hopefully this is where my journey ends for this particular repair so I will mark the topic solved as my original aim has been achieved. If things don't work out after fitting the new components then I'll return with a new topic ;) Thanks again all :-+ |
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