for practical learning i have a damaged samsung refrigerator board i guess the problem refer to transformer the model of transformer is EE19-220-12-A it's have 5 pin in one side and 4 in another side how i should test that transformer ? should i cut it from board then start testing ? some one pls help me ...
It's not likely the transformer.
Look up the datasheet for the SMPS controller/switch chip and compare how the transformer should be connected. You can check it for continuity well enough in-circuit (if it's shorted or whatever it's not easy to detect).
It's likely the chip. Possibly made by Power Integrations. Order another one and try swapping it out, replacing any blown fuses with the same type and rating at the same time.