iMac 21.5 inch blows home fuse

[Fishrrman]

4-year-old thread.
If the OP hasn't gotten it fixed by now, forget it...!

 

[USB3foriMac]

4-year-old thread.
If the OP hasn't gotten it fixed by now, forget it...!

It's not OP.

 

[avro707]

If the OP hasn't gotten it fixed by now, forget it...

Pankajet is not the OP and is asking something related.

Personally I wouldn’t be tinkering inside the PSU, I’d be looking to replace the entire PSU.

Another alternative just upgrade the entire machine to a later more powerful iMac which should be relatively cheap now.

 

[pankajet]

If the home fuse blew, there was excess current, which normally comes from shorted FET on primary side, either PFC or at the transformer. Since you already swapped the PFC FET, I'd take another look or two at the transformer FET. If they are really not shorted, chech the diodes on the secondary of the transformer.
Look again and again at FETs and diodes, one of them must be either shorted. Check not only drain to source but also Gate to drain/source. Remember the parasitic diode that you will measure at D-S.

Which diodes to be checked on secondary of the transformer ?

 

[pankajet]

Pankajet is not the OP and is asking something related.

Personally I wouldn’t be tinkering inside the PSU, I’d be looking to replace the entire PSU.

Another alternative just upgrade the entire machine to a later more powerful iMac which should be relatively cheap now.

thats already done, bougth new one and imac running using new one.