vedo35
Member
I have a smps belong to satellite receiver. It wasnt working. SG6841 was defective. i chanced it. After chanced i heared tic tic sounds from smps. I chanced main filter capasitor that is 100mf/400V. Again same. I controled mosfet SPA04N60C3 (Q2) its ok looking and i chanced anyway with same volts n-channel mosfet again same. Later i chanced at primer and seconder side all capasitors, resistors, diods, varistors and zeners. Again same. Later i desolder smps transformer at primer side 100mf/400v capasitor,opto-cuplor and mosfet. I controled gate enterance of mosfet between sg6841 pin-8 again i can see triggering. I chanced again SG6841 with new one. Again same.!!! ![Mad :mad: :mad:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Mad :mad: :mad:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Mad :mad: :mad:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
So what can be the problem?
I am sending last photo after desolder transformer,optocoupler and mosfet.
Note: only i didnt chance 220 filter transformer.
So what can be the problem?
I am sending last photo after desolder transformer,optocoupler and mosfet.
Note: only i didnt chance 220 filter transformer.