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I would suggest it is likely a ribbon cable problem, as 90% of my 450D issues are traced to bad ribbon cable connections. A ribbon that is not perfectly aligned to its connector and with a good lock bar can give open circuit conditions. I have had to replace a processor board simply because of a broken hinge on a connector locking bar. I have developed a way to change 450D sensors without disconnecting the main problematic ribbons on the processor board and error incidents on reassembly are virtually nil now. Ribbons the make tight turns behind boards are the ones under the most stress of being open circuit.
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