<div dir="auto">Thanks Peter, I'll keep that in mind if nothing else pans out. I kind of like the troubleshooting challenge and I'm always looking for an excuse to order some bits and bobs from mouser :) </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 15, 2023, 8:12 PM Peter Knoot <<a href="mailto:peter@synquanon.com">peter@synquanon.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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Send it to Intellijel - they fixed mine for free.
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Peter Knoot
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14197 N Hidden Arroyo Pass
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650-759-2101
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<a href="http://www.synquanon.com" target="_blank" rel="noreferrer">www.synquanon.com</a>
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On 02/15/2023 4:58 PM MST Shawn Rakestraw via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank" rel="noreferrer">synth-diy@synth-diy.org</a>> wrote:
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Someone gave me an Intellijel TSP80W power supply that is not working correctly. It is for eurorack of course. The +12V and +5V look good, but there is nothing on the -12V.
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I sent Intellijel a message and asked for any help they might offer, but I thought I would ask here also while I wait for their response.
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A few things to note is that there is an LTC3853 Triple Output Step Down Converter. I don't know anything about this chip, so I don't know if that is creating / controlling all 3 voltage rails or not. Near the end of the circuit just before the -12V LED, there is a series of IRF5305 Mosfet, then a STPS745G rectifier, and I believe an inductor marked 150 1752.
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I found a ceramic capacitor between the mosfet and rectifier that seems shorted, but I don't know if there is another part of the circuit causing that or not. And I haven't tried removing the cap yet to test it off the board.
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If anyone thinks it is worth seeing pictures or anything, I can try to attach.
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Thanks for any help.
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Shawn
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