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characteristics P6KE200A

Bluejets

Oct 5, 2014
6,901
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Oct 5, 2014
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6,901
Have an smps out of a HP Compaq with no output.

Tracked down to no startup voltage whatsoever. Checked all surrounding components which appear ok.
Curious about the ( TVS) P6KE200A diode as it shows a similar diode in the attached schematics.
Actually the circuit below is almost identical in the HP unit which uses a TNY268 switcher.

Diode tests ok as far as diode test is concerned but both in the schematic below and on the board in question it is shown with zener characteristics.

I removed the diode and tested it on a zener tester which showed 12.9v.
Am I barking up the wrong tree here or should the P6KE200A not be higher than that and how would one test it anyhow...?
 

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