| Electronics > Repair |
| Canon PowerShot SD1400 IS not powering on |
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| Pleco:
I recently repaired a displaced lens bearing in my Canon PowerShot SD1400 IS and now it no longer powers on. This repair required me to tear the entire camera down to get into the lens assembly. I've spent a lot of time trying to work out what went wrong, but haven't been able to find the issue. Here are some things I've checked so far: -The battery is still good. -There doesn't appear to be any damage to the ribbon cables. -I've cleaned all the contacts in case some debris was preventing the power button from working. -I've unplugged and replugged every cable multiple times. -The camera would display an error message if this was a component issue, so I suspect this is a power issue. -A visual inspection of the board shows no damage -Probing part of the power circuit with my multimeter and found no issues with continuity. Any advice for could diagnose this would be very welcome. I'm hoping I didn't accidentally short something out while I was in there. |
| Psi:
Are you sure you put all the cables/plugs back into the correct connector. Check all flex cables to see which side has exposed copper and check the flex socket you have it inserted into has contacts that match up to that side. Both flex cables and flex sockets can be single or double sided. So it's easy to get that wrong and have connector pads touching the insulated side of a flex cable. It can also happen if the flex cable is a mirror image and can be reassembled rotated 180deg. Sometimes that is fine, other times that will result in the connectors metal contacts touching the side of the flex that does not have any exposed copper. Check flex sockets for any SMT pins that have become detracted from PCB. Check ribbon cables for cracks again, they can be hard to see. Especially on the power ones and the ones from the on/off button. Does the camera have a factory reset feature by holding a button down, could try that. |
| Pleco:
Most of the connectors can only be inserted one way. For those that can be flipped, I've ensured the cables have been laid flat and have no twists. The connector at the top left of the attached image is for the power button. It's in an awkward spot, so I can't see the whole thing, but I've checked it a few more times and can see no damage. According to the manual, the camera can only be reset via the settings. Holding the power button doesn't do anything. One thing I forgot to mention is that the camera can also be powered on by pressing the image review button, which uses a separate cable from the power button. This no longer works either. |
| Psi:
Time to check voltages. Do the wires to the power button have any voltage that would indicate its actually looking for a button press. Voltage on caps around the main processor/mcu. Also give it a very close look over, ideally with a microscope, but with a magnification lens at the very least. Look for any parts that might have been knocked off the PCB accidently. That connector that is missing from the PCB at the bottom is probably some sort of production/debug port. There maybe a UART in it spitting out debug text, and you could also check voltages their too. |
| jzx:
Many cameras have a switch in the card door to avoid hot inserting or removing the card, it is actuated by a tab in the door, if it is not well aligned can impede powering. |
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