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UC3843: UC3843AN

Part Number: UC3843

Hello Forum Members,

I have got a UC 3843AN based laptop SMPS. The pin 2 (FB) is grounded. The supply is out of order with a fuse, bridge, MOSFET, Rs all damaged. Is there any reason for UC 3843AN pin 2 (FB) being connected to supply ground? Thanks in advance for your advise. Regards Andrew PS. Happy Christmas for all of you.