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A+ not booting with 16V PSU

horatioen

July 01, 2015 16:50

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Received the small thing of beauty that is the amp+

Attached the hat as per the instructions, but am not getting getting any activity / power lights on the PI

Have check the PSU with a multimeter and output is okay and stable

Are there any other troubleshooting steps I can take?

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9 comments

• 0
  
  HiFiBerry team July 01, 2015 18:44

  What kind of PSU do you use? How is it connected to the Amp?
  
  Best regards
  Daniel
• 0
  
  horatioen July 01, 2015 22:50

  Hi Daniel
  
  Super fast reply, thanks
  
  Am using a 16V switching PSU with a barrel connector
  
  I've measured the output when not connected with a multimeter and its stable at 16V
  
  It looks like it's making a good connection, but can I measure across the terminal block to confirm, or will that short something?
  
  N
• 0
  
  HiFiBerry team July 02, 2015 05:06

  please measure above the left 2 terminal screws. Also measure the voltage over C303 (on the lower left side of the board). Please also post more details of your PSU (vendor, specifications).
  
  Best regards
  Daniel
• 0
  
  horatioen July 03, 2015 17:51

  Hi Daniel
  
  0V over C303 and 24V between the two terminal screws
  
  The PSU details:
  
  Pri: 220V 7W
  Sec 15.3V 210mA 3.2VA
• 0
  
  HiFiBerry team July 04, 2015 08:44

  The 210mA are way to low for the Amp. Your power supply should provide at least 2A. However with 24V between the terminal screws, you most likely killed the voltage regulator. The Amp+ is designed up to 18V. Looks like your power supply is having an output that it much higher. What kind of power supply are you using there?
  
  You can send us the Amp back to our Swiss office, but there is a good chance, that your 24V output from the power supply destroyed the voltage regulation stage.
  
  Best regards
  Daniel
• 0
  
  horatioen July 10, 2015 21:18

  Damn! I'm gutted :( I was so careful to check the voltage output with a multimeter.
  
  When I measured it didn't exceed the 18V recommendation :(
  
  It was a transformer that I had around the house, thinking to use temporarily while building the setup. It's labeled as a hka-15321
  
  Damn, damn, damn.
  
  I guess it's obvious to most folks buying the amp about the 2A - would be great to have sticky here on the forum with PSU selection guidance.
  
  I guess I'll send it back to you guys just incase there's anything you can do / use it for
  
  Thanks for quick answers here Daniel, have a great weekend
• 0
  
  HiFiBerry team July 11, 2015 07:05

  Hi,
  
  yes, please send it to us (to the Swiss office). We will see if there is something we can do. In general, we recommend a Meanwell power supply in our shop:
  https://www.hifiberry.com/product/meanwell-gs60a18-p1j/
  
  Best regards
  Daniel
• 0
  
  horatioen September 01, 2015 14:24

  hi guys,
  
  was there anything that could be done with the amp finally?
  
  thanks!
  
  
• 0
  
  horatioen November 16, 2015 21:06

  Hi guys, 

  Would someone be able to contact me me about replacement / re-order options

  Thanks