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BlackMagic Cinema Camera
EF & MFT lens mount / 2.5K CinemaDNG RAW

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Old January 27th, 2020, 12:34 AM   #16
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Re: Big ursa magenta screen of death

A postscript to the broken camera saga.


I managed to find on eBay, another broken Ursa, an EF-Mount. This camera's etiology was incremental demise via power management. There was a strong chance the camera head was good and it turned out to be so.

The filter placement and collimation of the EF-Mount turret to the sensor was different so I ended up moving the entire sensor and PCBs across to the PL-Mount turret. I bench tested everything and it seemed fine.

In removing the supercapacitor from the motherboard, a solder pad came off the PCB. The layers on these boards are exceptionally thin. However it seems to function quite happily without it.

It seems maybe that the supercapacitor serves as a memory battery. I did not observe previously but it seems that when the camera is powered down, any time-date settings revert to the camera's birthday and playback clip order shifts in accordance with just when individual clips were started during power-on periods.

The SI2K also does this when the memory batteries go flat. Whether there is a conflict between files if one initiates during the same time period written to another file I have yet to discover. I may have to reset times and dates during each power cycle before rolling.
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Old January 27th, 2020, 01:39 AM   #17
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Re: Big ursa magenta screen of death

Interesting to hear!

So, an otherwise usable camera once again?

Andrew
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Old January 28th, 2020, 12:13 PM   #18
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Re: Big ursa magenta screen of death

It is usable again for now. Even its own power management glitch seems to have gone away.

It went through a period where it would not power-on from a battery unless it was "jump-started" from the 4pin XLR power input first, then for the remainder of the day it would run fine off the battery.

I wonder if the sensor/sensor PCBs in the failed turret may have been drawing too much power on its way to failure.

Whichever, I am going to accept what comes gratefully, hopefully for some time yet.
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