Xbox One S - need PSU schematic and boardview

[survivalbloke]

I've got an Xbox One S PSU opened up. I'm not getting 12vdc output as I do with my test unit. I'm sure this board must have a fuse but I don't see it as everything on the board is poorly labeled.

[stj]

post a picture - i dont think there is only one type
as for a fuse, look for a small box like a polyester capacitor but brown

[survivalbloke]

Originally Posted by stj

post a picture - i dont think there is only one type
as for a fuse, look for a small box like a polyester capacitor but brown

imgur

Thanks! What's the rectangular component which is in the lower right area on the last pic? It has two connections, is black in the middle and greenish around its edges?

Thanks!

[stj]

stupid site makes the pictures SMALLER when i click on them!

the green part is a resistor,
the fuse is gray and in the corner where the connector is soldered.
you can see one of the wires connects directly to one end

[survivalbloke]

Originally Posted by stj

stupid site makes the pictures SMALLER when i click on them!

the green part is a resistor,
the fuse is gray and in the corner where the connector is soldered.
you can see one of the wires connects directly to one end

Gosh, what an AWFUL picture. I'm confused and will take another, clear pic, under my scope so you can point out the fuse. I do see something in that corner, but it doesn't look soldered directly. It looks like it could possible be soldered to the same trace.

[diif]

Click Go Advanced below and then the paperclip to add them here.

[stj]

you dont need a microscope, just follow the tracks from the socket wires

[lotas]

In order not to search for a long time, I will make the task easier.

[survivalbloke]

Originally Posted by lotas

In order not to search for a long time, I will make the task easier.

I was just about to post another pic - but of the opposite side. OK, so that's a fuse for the AC side, I wasn't thinking like that. My mind is always in motherboard diagnostic mode. and this is the first time I've ever dabbled with PSU's. Now I get it - thanks!

**30sec later** Welp, fuse is good. I'm out of ideas lmao.

[survivalbloke]

If anyone knows common faults of this unit, I'm all ears. The fuse is good. I'm about a 5-6 on motherboard diagnostics but know nothing about PSU diagnostics. I've found a lot of info online about the Xbox One, but can't seem to find any info on the One S.

[stj]

if the fuse is good there are 2 common psu problems - not specific to this one.
first - shorted output diode.
so meter between the 12v and ground contacts

second - but i dont thing its old enough, although it is in a sealed box, the small startup capacitor that gets the chip running.
it's going to be an electrolytic connected to the chip with a value between 10uf and 47uf usually.
if it fails the psu cant start

[survivalbloke]

Originally Posted by stj

if the fuse is good there are 2 common psu problems - not specific to this one.
first - shorted output diode.
so meter between the 12v and ground contacts

second - but i dont thing its old enough, although it is in a sealed box, the small startup capacitor that gets the chip running.
it's going to be an electrolytic connected to the chip with a value between 10uf and 47uf usually.
if it fails the psu cant start

You're awesome! the 12V rail is shorted to ground. Using voltage injection I can see two components heating up. In this picture, that resistor is the first to boil off but right after, that component marked K401 boils off, so I'm imagining it's the K401? What type of component is that?

[R_J]

K401 seems to be a TS321IL

[survivalbloke]

Originally Posted by R_J

K401 seems to be a TS321IL

Thank you. Did you just google 'K401'? If so, I'm going to feel dumb. So that's an operational amplifier. I removed it from the board and the short is gone. I'll get that ordered up. Thanks to all of you!

[stj]

is that ceramic cap top-right even soldered down properly?

[survivalbloke]

Originally Posted by stj

is that ceramic cap top-right even soldered down properly?

Yes, just a bad camera angle.