Author Topic: D750 failure  (Read 241 times)

DanAa

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D750 failure
« on: December 29, 2021, 18:31:05 »
D750 failure
Today, when going for a trip in local forest, my D750 did not work.
Not possible to focus or select aperture
New in July 2015, shutter count now 42.000.
Firmware C.1.15 and L.2.016

Symptoms:
1.   No information in viewfinder
2.   Not possible to select aperture on the 24-120/4G lens. Locked to f=16
3.   Same effect with other G-lens (50/1.8G)
4.   No AF, either via release button or AE/AF button
5.   No effect of removing battery for a minute
6.   No effect of formatting CD-cards
7.   In M-mode it is possible to select different shutter times
8.   It is possible to select ISO or Auto-ISO
9.   Both external info-screens working
10.   It is possible to view photos on back screen
11.   ‘I’ and ‘info’ buttons work ok
12.   Camera releases due to selected shutter speed.
13.   Pushing AF-selector does not show up any information in displays
14.   When camera ‘on’ there is a weak flashing in left side of viewfinder screen
15.   No effect of resetting the camera, two-button.
16.   Meter seems to work on ‘M’-mode (when select shutter speeds)
Any advice?
(I am not sure that it is worth a repair?)

MEPER

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Re: D750 failure
« Reply #1 on: December 29, 2021, 18:39:08 »
Is the camera able to recognize the lens in EXIF data (if you are able to fire)?
I was thinking about a bad contact connection to the lens and fault is on body?

Akira

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Re: D750 failure
« Reply #2 on: December 29, 2021, 23:51:12 »
Is the camera able to recognize the lens in EXIF data (if you are able to fire)?
I was thinking about a bad contact connection to the lens and fault is on body?

The same thing comes to my mind first.  You should check out the camera-lens contacts.  How about wiggling the lens in the mount while pressing and holding the lens release button?
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DanAa

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Re: D750 failure
« Reply #3 on: December 30, 2021, 12:29:22 »
You are right. There is no EXIF data, and only data from Non-CPU lens shows up in the upper display. Only mechanics are transferred from lens to body. No electrics are transferred. Even when wiggling. So, I assume that the problem is inside the body.
However, while looking at the upper screen, this screen suddenly showed up two digits I’ve never seen before (maybe: 21 – 24?). Are there any kind of failure codes that can be shown?