My Yamaha PSS-A50 won’t switch on (It’s a common problem)

This guy says he can fix it but can’t post his video until Autumn

This is how a neural net says to fix it (joke)

I wrote up this space into a blog post

Fixing a Yamaha PSS-A50 that won’t switch on - SteGriff

I got lucky and sandsoftwaresand.net started a series on the A50 just as I started looking into it!

Yamaha PSS A50, F30, E30 - Dead - No Power - Fix

He said that the PSS-A50 is a miniaturization of the (full size) F50

https://www.reddit.com/r/synthesizers/comments/kjzwj5/my_yamaha_pss_a50_wont_turn_on/

Block

Manuals

psrf50-yamaha.pdf Service Manual (F50)

http://sandsoftwaresound.net/yamaha-pss-a50-look-inside/

Yamaha PSS-A50: Look inside | Sand, software and sound

pssa50-en-om-a0.pdf PSS-A50 Instruction manual

https://www.reddit.com/user/Wee-Muse/

Power

TI TLV74333PDBVR: 3.3V regulator (IC001) TI TPS63060DSCR: Switching regulator (IC004) TI TPS25200DRVR: 5V eFuse/power switch (IC006)

Tests

Fixing

The A50 must choose and switch between +5V USB power and battery power. That’s the role of the eFuse/power switch component.

I could buy a couple of each of these components, but:

You either have to buy in 30+ volumes or pay a £10 handling charge

They are surface-mount

They could just blow again??

Parts

IC001

TLV74333PDBVR https://www.ti.com/store/ti/en/p/product/?p=TLV74333PDBVR

tlv743p.pdf