Understanding , testing transformers

[Seaofdep]

Hi, I've been researching transformers and I can't seem to find anything about a particular issue I have came across. I'm posting here in hopes to get some help.

Inverter board : transformer pin 5 voltage drop .I have tested all the transformers and they all have the same voltage while grounded  , but I noticed one has a severe voltage drop on one of its pins when not grounded, which makes me believe a faulty transformer, what i would like to know is how and why do transformers have voltage drop fault , is it fixable and why do I get same voltage on all transformers pins while grounded ? Any help is much needed and appreciated thank you


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[T3sl4co1l]

Uh... schematic?

Tim

[Seaofdep]

I couldn't find one , but I'll post a pic of the inverter in a little bit


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