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Agilent E7495 linux root account

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9aplus:
Thank you Kirill,
My unit was on approx half OS boot, then went black.
The protection on external PS was safe triggered like short circuit.

Than I loaded battery on separate load rack and try to power on with
battery, the screen went on for the moment, than black again.

Now with all other connectors disconnected from A4A4 on power on
red LED goes on for short blink than protection trigg. again to black.

kirill_ka:

--- Quote from: 9aplus on November 22, 2018, 07:54:59 pm ---Now with all other connectors disconnected from A4A4 on power on
red LED goes on for short blink than protection trigg. again to black.

--- End quote ---
Try holding the red button. This should hold the PIC in reset state, so we know whether it shorts the supply before or after the firmware starts.

kirill_ka:
The yellow tantalum in the middle of the picture doesn't look good.
Or is it just a shadow?

TheSteve:

--- Quote from: kirill_ka on November 22, 2018, 08:33:44 pm ---The yellow tantalum in the middle of the picture doesn't look good.
Or is it just a shadow?

--- End quote ---

It does look like there is a chunk of it missing.

9aplus:
True, that tantalum is blown... Thank you for remote troubleshooting.  :-+ 

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