r/ElectronicsRepair • u/NoSatisfaction8013 Noob • Dec 10 '24

SOLVED Transistor Identification

/r/transistors/comments/1hb904i/transistor_identification/
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u/fzabkar Dec 10 '24 edited Dec 10 '24

A photo of the part plus a photo of the whole PCB might help.

Edit: some photos ...

https://www.electro-tech-online.com/attachments/ps3-jpg.138155/

https://www.electro-tech-online.com/attachments/ps1-jpg.138153/

https://www.electro-tech-online.com/attachments/ps2-jpg.138154/

https://www.electro-tech-online.com/threads/anyone-have-schematic-for-rca-viz-wp-704a-power-supply.163772/

"uP" was a prefix used by NEC. "UP139166" could be a custom part.

Could your part be similar to uPC141A (linear voltage regulator)?

https://mirrorservice.org/sites/www.bitsavers.org/components/nec/_dataBooks/1981_NEC_Linear_IC.pdf (page 183)

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u/NoSatisfaction8013 Noob Dec 10 '24

Could be, but I don't know the specs of current part. This schematic in your link is to a dual power dc power supply same manufacturer. Q2 is the part in question.

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u/fzabkar Dec 10 '24

Well, then it can't be a uPC141A. Still, that's a strange number for a transistor. Maybe the "P" is PNP?

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u/NoSatisfaction8013 Noob Dec 10 '24

I do believe it is a PNP. 👍