Viper20A IC in XP510i Samson

[g1]

This Viper20A chip (DIP) in the SMPS is obsolete. Has anyone used Viper53EDIP-E as a sub.? schematic and data sheets attached.
Power light is pulsing and supply making clicking noise. When I hit the Viper chip with freeze spray it starts working normally and power amp works.

Another question about this mixer, main fan is very loud, it's a 12V fan running at 9V, I guess the fan is just bad?

[The Dude]

It looks to me like the two chips have different pinouts.

[The Dude]

FWIW: I did find a Dalbani "pull" on eBay. I've had good luck with them. They are original parts and tested. Not sure what it would cost to ship to Canada.

https://www.ebay.com/itm/12120131713...Bk9SR-C6l6DEZA

[g1]

Well then, so much for 'substitute' suggestions from digikey.

[The Dude]

I saw the Digikey suggestion, too. I'd have to look again, but I think the SMD versions are different pinouts than the through hole versions. Maybe that's the confusion. I saw that on the through hole versions one had supply on pin 2 and the other on 7 (among other discrepancies).

[g1]

The SMD doesn't match either.
The Dalbani part would be pretty much same for shipping as part price, so I will check if available from Samson dist. first.

[g1]

IC no longer available via Samson, same for fan.
Audiolabga has the IC, hopefully they will have a fan that fits as well.