The Phantom power comes from a seperate winding on the switching power supply.Likely one or more of the other voltages are not present due to a failure of one or more components. The supplies are current limited so a short anyplace on the board may cause the problem. I had one of these short betwen the +/- 15 volt busses because somebody spilled liquid into it.
Here is a close schematic... a slightly different model with less channels, but circuoitry is the same, just more copies of it in yours: I believe it is zipped with four files... the last is the power supply.
http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html
I took it apart and found no marks or gunk at all on the board or hardware. Can the power module (aluminum box) be replaced? Wondering if that might be the problem.
Getting parts from Behringer is really hard lately so best to replace individual components that are usually available from electronic parts houses. You will likely find one or more of the filter caps is shorted in the power supply. Check those just before and after the regulators on the secondary side of the power transformer.
Thank you very much. You've been very helpful and informative.
I have the. Same problem any pictures of the filter caps i should look at first
I ordered a power supply from full compass and installed it.same results the connection to the mixer lamp has been disconnected but I don't see that being a problem
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