[hpsdr] Troubleshooting a Hermes 5v Power issue

[David Carlson]

First time starting after a new build so no firmware yet but thanks..

Thanks to all for the ideas so far.

Dave
KA2OQZ

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Tim ORourke
Sent: Thursday, April 03, 2014 3:27 PM
To: Kjell Karlsen; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Troubleshooting a Hermes 5v Power issue

***** High Performance Software Defined Radio Discussion List *****

See list for last week or so, if you are running latest FW and TAPR LPU it may have 5 v rail dragging below 5 v.
Tim w4yn


-----Original Message-----
>From: Kjell Karlsen <la2ni at online.no>
>Sent: Apr 3, 2014 2:06 PM
>To: hpsdr at lists.openhpsdr.org
>Subject: Re: [hpsdr] Troubleshooting a Hermes 5v Power issue
>
>***** High Performance Software Defined Radio Discussion List *****
>
>
>Hi Dave.
>
>Have you tried with an external 5V PSU?. But first I think you must 
>measure if there is a short on the 5V bus after F3. If Hermes works 
>with an external PSU, there is something with the SMPSU. And I know it 
>can be difficult to measure on the circuit!
>
>73, Kjell
>
>
>
>
>
>I finally got my Hermes built and had no 5v. I re-soldered u24 aka u58 
>and I now have 5v at pi3 of J26 but as soon as I connect the jumper 
>(pins 2-3) the voltage drops to about .4v. I thought it might be a 
>solder bridge somewhere but fuse f3 is not tripping so I'm thinking it 
>might still be a power supply issue. Does anyone have any ideas?
>
>Thanks,
>
>Dave
>KA2OQZ
>
>
>
>
>
>På Thu, 03 Apr 2014 18:40:37 +0200, skrev Dave . <kdcarlso at gmail.com>:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>
>
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Tim O'Rourke
W4YN at ARRL.Net
Low Power Amateur Radio Rocks
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