| Electronics > Repair |
| Canon PowerShot SD1400 IS not powering on |
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| Pleco:
I don't have an oscilloscope, but I can try finding which pins have voltage with my multimeter. Looking at the USB to UART adapters available, my camera has more debug pads than are needed for UART. That might make mapping things out difficult. |
| jzx:
You can use also a cheap logic analizer, but you must know the voltage of the signals. Probably 3.3V, but what you measure with the dmm is the mean value. Normally the uart has 4 pins, gnd, vcc, tx and rx, perhaps the round contacts, You only need the gnd, that you can take of many places, of the ground plane, and the tx. The logic analizer software can decode the messages if they are shorts, and discover the baudrate, then a uart to usb and a terminal program is better. |
| Psi:
Are you sure you know where all the switches/buttons are and that they are all working. Sometimes there can be tiny, like 3x3mm, SMT switches with an even smaller leaver poking out of the top or side. Sometimes the leavers snap off during disassembly, or the leaver get pushed too far inside the switch and doesn't spring back out. |
| Pleco:
I've checked the motherboard thoroughly and I don't see any switches beyond the one that shuts the camera off when you open the battery door. I accidentally damaged it while testing it by hand (it must have gotten very brittle over the years because I barely touched it). I've since hard wired it to always be on. Here are some closeups of the motherboard: |
| Pleco:
Wait, I just remembered: when I took the camera apart for the lens repair, I used a metal pair of tweezers to remove the display ribbon cable, which is directly above the pads for the battery contacts (marked in red). I forgot to take the battery out of the camera, so I'm wondering if I may have shorted out some components that are used to detect the battery's presence. Is it possible the camera can't see that there's a battery inserted? |
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