stuck working on repairing a baord.

[Al1234]

this may not be the correct place to post this. I am sure someone will let me know.
I have a board that I am working on. using tracker, found a shorted diode in series with a relay.
replace it. but there is more problems.
it looks like a transformer on the board has very different signature than the reference board transformer.
see pictures with notes.
I removed the bridge thinking problem was the bridge.
I would appreciate to hear other thoughts on this subject.
I am not familiar with transformer signatures and usually they are either out or good. this one has the output Voltage

[CWSmith]

The faulty board signature is showing a lower impedance suggesting that there is a short somewhere possibly the transformer it self. What else is connected to that circuit?

[Al1234]

Thank you for your reply. I tried to respond sooner, but had trouble signing in , my fault
I replaced the pictures with better ones.
There is nothing connected to the secondary from the rest of the board. I removed the rectifier bridge that transformer feeds voltage to.

On yhe primary side, which all the signatures match between the good and the bad board, are 2 zero ohms resister seen in the last picture posted. Resistors, connect to fuse and then a choke and incoming. There is no continuity between secondary and primary of the transfer.
What's interesting is when measuring resistance between the two pens of the secondary, both good and bad board match. it's the same on the primary side, they match. Measurment instrument agilent 34010A.
The only instruments that shows a difference in power off mode testing is my huntron.
Have not done hipot test yet. For that I have to desolder I think.
Nor, have I done any power up measurement yet. Feeding the transformer and measuring the output.
may be a hipot test next.

[CWSmith]

A DMM may not show an inductive change because it is a DC signal unlike a Tracker. The signatures pretty much point to a faulty transformer. Last step may be looking at it out of circuit.

[Al1234]

yap, that is what I was thinking. may be this weekend or in about 10 minutes, LOL

[Al1234]

Sorry for the long delay, Took transformer out.
Compaired with a new one. Posted pictures, there is a clear difference between signatures.
If you have any thoughts on this please share and let me know.

I connected power to transformers and measured the secondaries with out load.  It matches with the new transformer.
Next I was going to do a short circuit test. But I need to clean up the desk and set it up.
Or I could just put the new transformer in there and see if it works.