Re: Replacement part for IC4 #fst3253

Alan G4ZFQ

and it appears that IC4 is drawing excess current. Static measurement shows ~140 ohms VCC to ground. Everything else checks OK on the 5V bus.

Before replacing anything be completely sure.
Most faults are solder whiskers, if it was like it from the start even an unetched piece of copper, component failure is unusual except when stressed.
A test is to gently lift pin 16 with a pin.

73 Alan G4ZFQ

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