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Old 10-01-2022, 10:02 AM   #1
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Join Date: Apr 2021
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Default Nikon D800 camera - flash donít work and capacitor donít charge

Hello, Iím stuck in troubleshootingÖ
The flash system works like that : when the (mechanic) flash button is pressed, the flash mecanically pop up, and a circuit buck boost elevate 7v (batt) to 200-300v (?) for charging the big capacitor. And when the photo shoot button is pressed, the capacitor is discharged in the xeon light.

In the D800, there is a first ę power board Ľ close to the battery. 2 wires (batt 7v) goes to another little ę flash board Ľ. I measured 7v, so ok.
When I press the flash button, itís detected by the system, flash icon appear on LDC display. So mechanic of button seems ok.
The capacitor (linked to flash board) should be charged, but it stay to 2,6v.
I replaced the ę flash board Ľ by a same one from another working D800 and the same. Capacitor stay to 2,6v.

There is only 3 ways : capacitor, flash board or command signal from something to flash board

The flash board is ok
Capacitor ? It is visually clean. If it was dead, the flash board would continue to provide 200v and not 2,6v ? (I donít know) ?
Command signal (a no ready flag ?) another system not detecting flash opened ?

The next tests need to disassemble more the camera, and I would like to have your opinion before pls ?
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