Reply to "Design of a $10-20 DCS-TIU Port Tester Tool?"

Connecting R11 to D2 would be very bad for the health of the IC, so replace that first.  If D1 is bad, it won't cook anything, the unit just won't work.  Since you have 5V, D2 and U1 are still OK.  I'd say U2 and D1 are the top suspects.

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