Troubleshooting my canon

Here are some troubleshooting steps that you can try that may (or may not) correct your problem. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty (or repair cost approaches that of the camera), they're worth that try. Some of the later steps do involve some risk to the camera, so carefully weigh your options before deciding to conduct them:

And here's a video summary of the steps:

Hi you can download from here--
http://www.starbatteries.com/caposd5mpdie.html, open it and click on "Canon Powershot SD400 5MP Digital Elph Camera View the product manual [Download- PDF, "

thanks

New cards must be formatted in the camera to work properly.

if there is image formation u will find image on the lcd,defect with the formation,so CCD and shutter must be chaqued.

Push the display button.

You have a short circuit in your camera...it can produce a flame. Be careful.

I'm guessing you bought a new 4GB SDHC card. Although it looks exactly the same as a standard SD card, the format the card uses is very different. Unfortunately your camera was designed before the SDHC format came out. Sorry, but a SDHC card will not work with your camera.

You'll need to use standard SD cards (usually those 2GB or less). But if you really want to use a 4GB card, do a Google search for 4GB SD "non HC", with the non HC in quotes. Believe Transcend makes one.

You mean SD400 camera doesn't show any error sign and it just doesn't have live view to shoot picture?
If yes, its problem of bad CCD imager and Canon will provide free of cost repair facility for SD400 camera.
Click Canon CCD Advisory for details.

Sounds like your LCD might have gone bad. The LCD might cost more than the camera costs, but there are a few places on eBay that you can buy a repair and replacement service from for pretty cheap.

I just repaired my Canon G2 with the same symptom.  The internal PCB that you plug the external AC adapter is defective.  The numbers on the board are:

GCMK-M1X