Hi All !<br><br>I am having a problem since sunday. I am not making progress in debugging the error. Hermes ran nearly the whole weekend during the contest. The enclosure was warm but not hot.<br><br>The problem:<br><br>The board starts fine es every time and i can run it for lets say one minute with cuSDR64, ghpsdr3. After the minute the leds are only showing half of the light than before. the board is then no more reachable and cannot be discovered. When i start the board in bootloader mode everything is normal. When i remove the jumper and powercycle the board it runs also fine just to the time i put the networkcable in. it seems that network traffic can speed up that failure.<br>
<br>I measured as follows:<br><br>U18, PIN3 = 13,6 Volt<br>U18, PIN2 = 11,9 Volt<br><br>in normal operation and after shutdown.<br><br>The SMPS 5V output shows 4,96 V also in normal conditions and after the shutdown (measured at L32). So i think the 12V and 5V Buses are ok ?!<br>
<br>Now i measured at C153 and C174 and the input Pin of the LTC1529. During the normal operation i have 4,45 Volt there. During the minute until the shutdown the Voltage decreases down to 2,83 Volt in 0,01 Volt steps. The last steps are faster.<br>
<br>When i understand the schematics right i should have the same voltage at the end of L32 and at C153.<br><br>This must be something serious or silly. I hope the last one.<br><br>In bootloader mode i am able to program and successfully reprogrammed the board back to 2.2 which results in the same behaviour.<br>
<br>73 Oliver DL6KBG<br><br><br><br><br>