Rank: Apprentice
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I have the C875 - and had the same problem. It was out of warranty so I took it apart and found that the flex print wiring between the flash electronics and the flash unit was bad. It has 4 wire runs and at least one of them was broken. I cut the flex out and soldered in 4 fine insulated wires in its place. The flash works fine now. The hardest chore is taking the camera apart.
Warning: Wear rubber gloves since high voltage is stored in the flash capacitor even with the batteries out. I got zapped several times.
1) Remove all screws on the left side, right side, and bottom (including 2 inside the SD card door). Remove any SD card.
2) Remove the lanyard attachment fitting and then front and back covers.
3) Remove screws holding the metal center band in place. I recall there's a hidden one that's a long reach inside to remove.
4) Bend the band down to clear the tripod mounting hole and slide it off toward the front. Watch out for the fine speaker wires which will tether the band to the camera. I broke one and had to resolder it during reassembly.
5) You will see the orange colored flex leading to the flash. Snap out the flash.
6) At this point you could check the continuity of each wire to confirm the problem.
7) Cut/strip 4 wires to match the lengths of the runs. Use very fine insulated wires - 30AWG or so. Thicker wire might not fit.
8) Note the wire routing. Cut out and desolder the old flex print.
9) Solder in the new wires
10) Snap the flash back in place and dress the wires like the old flex print.
11 Reassemble. You can test it once you put the metal band back in place.
Ther C875 is a great pocket camera. One very much worth fixing.
