Tektronix TDS5032B Diagnostic Failure

[trieck]

I purchased a Tektronix TDS5032B on eBay that was not working.   I was able to repair it by re-capping the motherboard, replacing the power supply and replacing the memory.  However, when the TekScope.exe application launches, I receive a diagnostic failure on one test.  The test is called LineTrig under the HITL (Hardware In The Loop) area.  The result of the test is code 445.

I haven't been able to find a lot of information about this error.  From what I understand, the line trigger would typically be associated with a TV or video signal.

Any help in tracking down information about this error or where I might begin to think about repairing this would be greatly appreciated.

Thanks

[voltsandjolts]

Power line trigger, like 50hz or 60hz
Maybe related to changing psu
Was there a loose wire pickup taped to the incoming live line

[mikehank]

Line trigger input comes directly from the power supply.  It is the frequency of the input AC.  60 Hz for north America.  Look at the power supply it looks like a common ATX supply but it has a couple of non-standard connectors.  I would start there.  I don't think I've seen the ACQ board cause line trigger failures.