hi there need some help to trace parts on vs550 corsair cpu

[heng84]

my friend gave me this psu (corsair VS550) for free , since the technician quoted him around 45usd he would rather buy a brand new unit, which I decided to take from him and attempt to repair it , then charge him whatever I spent on replacement parts otherwise I keep it but when I open it there are 2 missing parts , one power ic chip (7pins) and one zener diode located zd1 can anyone tell me what those parts are?
sorry for my poor English from Malaysia here.
truly appreciate if someone could help thanks

[Behemot]

Re: hi there need some help to trace parts on vs550 corsair cpu

The stand-by controller would be the TNY177PN or similar, though for the diode try refering to the reference circuit.

[heng84]

Re: hi there need some help to trace parts on vs550 corsair cpu

The stand-by controller would be the TNY177PN or similar, though for the diode try refering to the reference circuit.

ok you are right , after googling online by typing "vs550 tny177pn" found the results.. thank you so much!

[Behemot]

Re: hi there need some help to trace parts on vs550 corsair cpu

I had 177 in the VS450. There may be something else in VS550 though unlikely. According to datasheet all the versions are interchangeable, basically just the maximum power differs. If its rated 2-2.5 A on the SB rail, than the 177 is adequate. Using 178 may be better as it should have lower losses and stay cooler as the FET has lower Rds(On).

In all cases check all the surrounding SMD components and when testing, use the lightbulb-in-series procedure to save yourself from explosions.

[heng84]

Re: hi there need some help to trace parts on vs550 corsair cpu

I had 177 in the VS450. There may be something else in VS550 though unlikely. According to datasheet all the versions are interchangeable, basically just the maximum power differs. If its rated 2-2.5 A on the SB rail, than the 177 is adequate. Using 178 may be better as it should have lower losses and stay cooler as the FET has lower Rds(On)

In all cases check all the surrounding SMD components and when testing, use the lightbulb-in-series procedure to save yourself from explosions.

Thanks for the great tip I will do it, as for the zener diode all of them are 4148 zener should I just use that? Not too sure what u meant by referring to the reference circuit