If You are really bored, the best thing to do is to remanufacture a body, which was already “repaired” by somebody else.
I’ve done this only because i had mounted another 400d one day before, and I had my freshly made repair itinerary, with the precize description of the screws.
This body was not working at all. There were less screws in the outside then holes, the CF card was not possible to eject (the readers housing was totally damaged, as I’ve seeen later). Even the existing screws were permutated.
On the bottom of a body You can find normally some short metrical screws (for metal thread). In this case there was on 8 (!) mm long one, instead of 3 mm… Exactly in the middle, where the flatcable of the sensor is located :). The sensor is shielded whith a metal plate.
Left is the shielding (0,5 mm steel plate)
The screw worked a hole in it…
The hole was perfectly threaded…
On the other side the screw made a small cavity in the flatcable…
I disassembled the body, I replaced the missing (correct) screws.
After 3-4 assemblings-disassemblings I eliminated all the shortcircuits in the cables (I hate the 350d and 400d).
At the moment the body works – excepting 2 things: the AF sometimes wors, sometimes not, whith the Canon 50 mm F1,4 better, but not perfect, with the 18-55 not at all. But sometimes starts to work perfect. Strange.
The other problem is with the AF feedback LED-s. They can be seen very-very poorly.
Do You have any idea, what could be wrong?