CMOS camera sensor issue - Page 1
Forum section: electronics / beginners

author: HansaG
author_rank: Newbie
timestamp: November 18, 2021, 05:48:50 pm
content: Hi there,I bought the following scope from AliExpress "Eakins" seller two years back and since the day I received it was not working.Camera was showing pink and green lines as seen below.So I complained to them and they sent me a replacement sensor board, which I fitted as per the factory installation and saw the same result pink and green lines.They wanted me to post it for inspection at that time but with the pandemic the postal services from where I live to China was suspended and I could not send.So I didn't throw it away and kept it with me, today I had some time and checked the ribbon cable connecting the motherboard and the sensor board and noticed that there is no connectivity in any pins. So I tested the ribbon cable and it was all good.For my surprise I realized that the ribbon cable was installed wrong way up. So no wonder when installed as per factory fitting it had no connectivity.So I installed the ribbon cable correct way and with the lens removed I could see light orange screen in the monitor nowand those pink and green lines were gone.I can see color changes when I move my finger on top of the sensor.But now the issue is after installing the lens I only see a black screen.what might be the cause of this?Have I destroyed the both factory installed and spare one by installing the ribbon cable wrong side and powering up?Or is it the lens?An insight would greatly help.

author: Manul
author_rank: Super Contributor
timestamp: November 18, 2021, 06:00:17 pm
content: Quote from: HansaG on November 18, 2021, 05:48:50 pmIn your video without a lens, it looks like a perfectly working sensor to me. What you mean black screen? The sensor obviously responds to the light, so I would not expect all black with a lens. I mean, there might be something wrong, but not black screen. Is lens not passing light? Can you check visually? Is there a shutter in the lens which is closed? I'm not familiar with this model. Maybe something else went wrong while putting lens?

author: HansaG
author_rank: Newbie
timestamp: November 18, 2021, 06:11:22 pm
content: There is no shutter in the lens and it cam be rotated by hand focus the picture.Lens is passing light. I check with my eye.When I checked (with my eye) from front side of the lens I can see clear small images.But when I view from the backside (which screws in to the module) I do not see any clear picture. Every thing is blurred.I then fix the lens to camera module and flash a light in front of the lens, I can see only blurry image flashing in the monitor. But no clear picture no matter I focus it using the lens.

author: Manul
author_rank: Super Contributor
timestamp: November 18, 2021, 06:22:27 pm
content: You should take a lens and try to move white paper near and far to focus an image of a bright object in front (like a lamp). What is focus distance? Does it look about right (distance from lense to sensor in the camera when it is mounted)?Edit: The lens migh be just zoomed into very high magnification and you cannot catch clear picture easily and also it is really dark, needs a lot of light. That might be the reason, I saw that it goes up to 130X, that is really a lot.

author: HansaG
author_rank: Newbie
timestamp: November 19, 2021, 02:47:31 am
content: Quote from: Manul on November 18, 2021, 06:22:27 pmThank you so much for your help.So now I'm sure the sensor is not faulty, I can now direct attention to the lens.Any progress I will post back.Thank again for you kind time!

author: HansaG
author_rank: Newbie
timestamp: November 19, 2021, 04:46:19 pm
content: Resolved.It was the lens.I had to adjust length between the lens and the sensor and it worked.Thanks a million!