Electronics > Repair

Help needed to identify SOT23 component 418Q1

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fripp:
Can anybody help me identify the component in the picture below.  SOT23 symbol 418Q1.  I believe it is a voltage regulator but it seems to have failed.  Not sure what the output voltage should have been.  Closest I have found is Fortune FS8854 but they don't list Q1 as a voltage option on the datasheet I can find. And it seems to be obsolete now.  Manufacture date was 2019.

fripp:
Reverse engineering has given me this schematic, but no clue to actual voltage from the 418Q1 regulator.  It is powering switched mode voltage sensing control circuitry from a 12V battery charger.

Any insights or strategy to progress gratefully welcome.

At the moment the output voltage from the regulator just tracks the input voltage up to 14v, I haven't taken it higher.  When the VAC is supplied to the Switched Mode PSU it constantly trips into over voltage mode and resets every few seconds or so.  I think this is from the 431 Zener detecting the over voltage in the control circuit supply and tripping the opto.

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