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• #5225 playboygamer újonc

  Új Válasz 2025-05-09 17:26:35 #5225

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  playboygamer

  újonc

  Hi everyone,
  I'm trying to repair my Logitech Z906 subwoofer, which suddenly died right after switching it on.
  There was a strong burnt plastic smell, and two input LEDs briefly flashed – then everything went completely dead.
  When I opened the subwoofer, I found a badly burned SMD capacitor on the power supply board, next to a ferrite transformer labeled ER40.
  The burn mark is visible on both sides of the PCB – maybe not fully burned through, but clearly damaged.
  📌 What’s interesting:
  This looks very similar to another post here, where C86 was burned, and possibly a MOSFET wasn't properly connected or failed, causing a chain reaction.
  I suspect something similar happened in my case.
  🛠️ Details:
  Model: Logitech Z906
  Revision: Latest version with blue PCB
  Likely manufactured in 2022
  Integrated PSU board, fixed inside the subwoofer
  Board was always connected to power (standby for 1 year) before failure
  Found capacitor based on comparison photos from a working board – but I don’t know the exact value/type
  🧪 I plan to clean the board with spiritus (ethanol), not done yet.
  🧰 Available Tools:
  Soldering iron + hot air station
  Solder sucker
  UV-curing solder mask
  Multimeter (no ESR meter)
  Fine copper wire for trace repair
  Cleaning supplies: spiritus, acetone, swabs, brushes
  ❓ Looking for help with:
  Can someone with a Z906 measure or identify this capacitor? (same position as C86 in that other thread)
  Is there a full schematic / part list for the PSU board?
  How do I test MOSFETs, diodes or other components to be sure the failure didn’t go further?
  Would a Hi-Fi repair shop be able to properly trace and repair this kind of PSU fault?
  I’d really like to save this unit. The Z906 is Logitech’s flagship speaker system, on the market since 2011 and revised many times.
  Since I have the latest version with blue PCB, I expected a reliable and refined product – not a catastrophic failure like this.
  🙏 Any help (measurements, ID, repair tips, photos) would be greatly appreciated!
  Thanks in advance!
  
  

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