Xbox One S - Beep on, few seconds, Beep Off

[Chiefdm]

Hi all,

First post here, I've done a quick search already and found a few helpful posts but nothing that can really give a definitive answer, so here I am.

Bit of background, I know a bit about electronics (probably enough to be dangerous.... just) but I'm looking to start picking up board repair after 20 something years in IT. Thought I'd chuck myself in at the deep end and pick up a broken Xbox One S on eBay thinking that I would approach it as more of a "can I fix it" project rather than a "should I fix it" time saving exercise. I understand the generl layout on the board but obviously there are no schematics available for these things.

So, on to the board. It has a stable 12V rail, and the mosfets on the 3 phases all seem to be ok. There are some fairly low resistance to ground readings (60ohms) around some of the memory rail components and a direct short on the V_CPUCORE test pointand extremely low RTG of 2.2 ohms on the NBCORE test point.

What I have just noticed literally while typing this up and taking measurements is that there is a voltage regulator (this one https://www.onsemi.com/pdf/datasheet/cat6243-d.pdf) on the left hand side of the board measuring a direct short on Pin 2 which is the Vout pin which I'm thinking can't be good. I'm guessing that can only be caused by either that component going bad or the smoothing cap on that output going bad?

Anyways, who want's to come down the rabbit hole with me to try and get this thing working??     Any help/suggestions is/are very much appreciated!!

[Chiefdm]

Ok, bit more progress. I have now removed the northbridge chip using possibly the most ghetto rework setup ever…..! But it’s off and clean just need to find time to reball it now. Removing the chip has got rid of the short on the 3.3v rail though so I’m hopeful that once I get it back on that bit will be ok. Pics attached for those interested.

On the flip side though I still have a short on the CPUCORE and GFXCORE rails…… looks like I might be breaking out the ghetto rework setup once more to try and remove the APU as well!