Possible RoBoard 100 hardware problem. Help!

[Garrod]

I just got a new RB100 board with the VGA card and cable kit. I think the board may have a hardware problem.

When I apply power the board boots normally and I was able to install XP via the slipstream method and get the board running fairly easily. The board being restarted a couple of times as part of the XP installation.

The problem comes when I turn the power off and immediatelt turn it back on. The board fails to boot. There seems to be no logic to the LEDs on the corner of the board, the red LED always comes on, the green one is sometimes off sometimes on. But no display, no boot.

If I wait 10 - 20 minutes. I apply power and the board boots normally.

I have tried this with normal LAN and USB connections (Mouse, Keyboard, CDROM) and with nothing commected to the board, same behaviour.

I am currently using a bench stabilised power supply to power the board. I have tried 6.5, 9, 12 and 18V, same behaviour.

Am I doing something stupid, (Always possible) or is there a hardware problem with this board?

Thanks


Mike

[roboard]

The problem comes when I turn the power off and immediatelt turn it back on. The board fails to boot. There seems to be no logic to the LEDs on the corner of the board, the red LED always comes on, the green one is sometimes off sometimes on. But no display, no boot.

If I wait 10 - 20 minutes. I apply power and the board boots normally.

Hi,

a too low or unstable low input voltage to RoBoard will trigger the low-power protecting circuit so that the reset pin of RoBoard's CPU is holded. This can cause RoBoard not to boot normally.

So when you turn your power supply off and immediatelt turn it back on, your power supply may stay at a lower voltage (or unstable low voltage) for a longer time interval, which makes RoBoard fail to boot.

Alternatively, you may try removing RoBoard's power connector and immediately plug it in to see whether the problem still occurs.

[matt.stevenson]

If I remember correctly, the red led is power and the green is for the micro-sd card. If the green doesn't come on, you may not have access to your disk.

[Garrod]

The problem turned out to be due the the rate a which the power supply voltage decayed. Pulling the power cable off the board with the power supply switched on, (something I normally would not do) ant the board boots perfectly within seconds after having power removed.

Similarly, with a battery and a switch no problem.

Thanks again

Now the next challenge...

Mike