SOURCE: Canon Powershot A550 flash will not work it just blinks on & off?
Hi
There are several things that could cause this.
1- Check the battery door indicator switch under the battery door and beside the memory card slot. Is the little black switch damaged or missing? Try pressing down gently using a pen it with the door open and then press the power button. Does it turn on?
2- The fuse has blown and needs to be replaced. Offhand I don't recall where it is on the SD750 PCB or how hard it is to solder on a new one (depends on if its tricky to get at or not). Good thing is fuses are really cheap.
3- Other power problem with the PCB due to corrosion or impact damage. The PCB or 'motherboard' of the camera will need to be replaced.
SOURCE: My canon powershot a640's flash isnt flashing.
I can't believe I just managed to fix exactly this problem on my camera. Warning - the process hurt somewhat, but it did work.
I dismantled the case very carefully: After taking the shiny grey cover on the screen end off (3 screws, noting carefully where each screw was), I took the top cover off.
That was a case of unscrewing three screws at the bottom of the battery compartment (I left them in place, as it looked tricky to locate them again, subsequently working with the camera upside down), then gently prising the top off - there is an internal clip just next to the visual viewfinder, which you have to wiggle a bit - just use a fingernail to prise it open. The top lifts off - dangling on with its cable.
Here is the unpleasant bit. Quite accidentally, I shorted the flash capacitor, by touching its circuit board - and got the most surprising electric shock.
I looked around to see if there was anything else I would be able to do, felt there wasn't, so I put it all back together, in the hopes that it might have fixed my problem.
Hey presto, I now have a working camera with working flash!
SOURCE: canon a300
This sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following two links for more info:
http://camerarepair.blogspot.com/2007/11/canon-digital-cameras-showing-black.html
http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819
Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/300/400/430/500, IXY Digital 200a/300a/400/450/500
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