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[Nikon D90] Showing blinking "err" message, lock up mirror not available, state persists.

Yesterday I bought an HDMI mini and connected the camera to the TV. After a while of testing the focus on it, the camera's live view went blank, and the Live View on the camera turned off and the camera started showing a blinking error message "err". I turned it off then on, still the error message blinking. I pressed the shutter button, the camera made the "Shutter Sound" as if I was shooting in a high speed mode (like the shutter in closing more than once). Everytime I press the shutter button the LCD shows the shutter speed and the aperture for a second, and goes back to the blinking error message. I kept spamming the shutter button, then tried to turn back the live view. it took photos for a while, then it went black again giving the error message. I turned off the camera, removed the battery for a minute, then put it back on, turned the camea on and looked through the viewfinder while pressing the shutter button. like every 2~3 times the view in the finder is black, then at the 3rd or 4th time I press the shutter it shows the view. I googled the issue, and found things on the internet, people suggested formatting the SD card with a FAT32, I did. I removed the battery. I tried to clean the len's pins and mount pins, but I was afraid and didn't know how it should be. Anyway, I noticed this when I had the lens removed, the mirror had different "angles" everytime I did that. I decided to use the "lock up mirror" option in the settings. It was grayed out, and so was the "clean image sensor". I kept pressing with the shutter button and the mirror lock option became available.. I set the option and removed the lens to look at the mirror.. there was no change, pressed the shutter release like it stated on the screen, and checked the mirror again, it became flat, but with a different bluish colour. The LCD was viewing blinking dashes (---- ---)I tried to click the shutter button to "release the state", nothing happened. so I turned it off, and on, and the error message came blinking again. It is still doing the same and showing the error message. Please help me on this issue, please tell me how to fix it... thank you.

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  • Sherif Azmy Jul 26, 2013

    I forgot to mention that I completely removed the lens, and I tried the camera, it kept giving me the blinking "err", and doing the same shutter. the only difference is that there is no connection with the camera to set the Aperture (F--). I know this because I use the old Nikon manual lens along the 18-105 bundled with the camera.

  • Sherif Azmy Jul 28, 2013

    UDPATE: I removed the lens and kept testing the shutter more than once. It kept doing the error thing, and it

  • Sherif Azmy Jul 28, 2013

    completely for a while, then came back again with a shorter duration, then stopped giving the error. I tried to attach the 18-105mm lens, and try.. the error message starting appearing, took it off and attached the 70-300mm and it gave the same result as being lensless, I still didn't try it much, but I'll keep trying and write my observations here.



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Nikon Imaging Products Support Page:

Click here for repair information.
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I get an err message after i take a picture. i notice this happens when the over/under exposure indicator in the viewfinder is blinking before i take the picture. the err message only goes away if i remove...

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According to and directly from Nikon:

When you see Err on the control panel, LCD monitor or viewfinder of your digital camera it refers to a camera malfunction. Try the following:
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  2. Install a freshly charged battery into the camera.
  3. If your Nikon camera offers resets such as the two-button reset or a hardware reset please follow those instructions provided in the product manual.
If these steps do not resolve the Err message we recommend having a Nikon Authorized Repair Technician evaluate the Nikon camera. Click here for repair information.

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