Help me heal my old Canon Powershot G7

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Help me heal my old Canon Powershot G7
« on: 13 / October / 2015, 06:41:57 »
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Hello, I've been using this old Canon Powershot G7 with CHDK for quite some time now.

Lately, something must have happened and all my efforts to take a photo produce some obscure looking photos, like this one:
https://imgur.com/HzvuEOH

I would really appreciate your help on diagnosing the problem and trying to fix this.

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Offline msl

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Re: Help me heal my old Canon Powershot G7
« Reply #1 on: 13 / October / 2015, 07:44:22 »
Hello and welcome,

it looks like a damaged sensor. Is the JPG out of the camera? What about an externally developed RAW image?

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Offline srsa_4c

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Re: Help me heal my old Canon Powershot G7
« Reply #2 on: 13 / October / 2015, 14:14:40 »
Lately, something must have happened and all my efforts to take a photo produce some obscure looking photos, like this one
If you can take usable pictures in complete darkness with flash then the mechanical shutter is stuck open. Either due to flex cable damage or other reasons.
Otherwise, it might be sensor failure as msl says.

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Offline reyalp

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Re: Help me heal my old Canon Powershot G7
« Reply #3 on: 13 / October / 2015, 16:59:23 »
From IRC,
Quote
< reyalp> olspookishmagus: guess, mechanical shutter stuck open?
< reyalp> or maybe sensor failure
< reyalp> http://www.imaging-resource.com/badccds.html
< reyalp> if you see the same pattern in live view, it's not the shutter
< reyalp> if it's only in stills, might be

< olspookishmagus> reyalp: indeed, it's only in the stills
< olspookishmagus>         thanks

< olspookishmagus> Total shoot: 5006
< olspookishmagus> and my shutter dies/died?
G7 is pretty old, it's seems possible it could be stuck for other reasons than wear. Was the camera unused for a long time before this started?

If you are able to do some scripting, you can try using the shutter eventprocs to close / open the shutter directly. This script http://chdk.wikia.com/wiki/Meteor_Intervalometer_with_Dark_Frame_Management should have the relevant eventprocs.

This could confirm for sure that the shutter is failed.
Don't forget what the H stands for.


Re: Help me heal my old Canon Powershot G7
« Reply #4 on: 23 / October / 2015, 06:53:54 »
Hello and welcome,
...
Hello and well met.

...
it looks like a damaged sensor. Is the JPG out of the camera? What about an externally developed RAW image?
Yes it's out of the camera, and this will occur whether this is a JPG or a RAW (DNG) image.

If you can take usable pictures in complete darkness with flash then the mechanical shutter is stuck open. Either due to flex cable damage or other reasons.
Otherwise, it might be sensor failure as msl says.
I've tried the step you suggested and it seems that in pitch darkness only with flash this will still happen.

G7 is pretty old, it's seems possible it could be stuck for other reasons than wear. Was the camera unused for a long time before this started?
No. The camera was always being put to use occasionaly.
Last OK photo was this: http://imgur.com/hStJoxB

Before this started to happen, I carried the camera with me in it's camera case (a Case Logic one) which was within a cloth bag. Along with the camera inside the bag were my heaphones and a couple of fresh UPS batteries (with insulating tape on their contacts).

If you are able to do some scripting, you can try using the shutter eventprocs to close / open the shutter directly. This script http://chdk.wikia.com/wiki/Meteor_Intervalometer_with_Dark_Frame_Management should have the relevant eventprocs.

This could confirm for sure that the shutter is failed.
Thank you all for your replies, I will give a go with the script reyalp suggested and I will report back.

 

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