Xbox One X Psu

[Viktor Árvai]

Hi I have a question about an xbox on x psu model1815 rev1 , Every time i plug it in it trips the housebreaker and the fuse inside. On the high voltage side almost everything is shorted to ground , on the 12 v side no short on main leads and nothing in general.
My question is what is the most common part that can cause this, i figured ill try it here first before i start pulling off everything.
Thank you!

[stj]

post some pictures,
in theory that shoudnt be possible because it should have blown it's own fuse!

[Viktor Árvai]

Strange yea , it blows its own fuse and the circuit breaker soon az plugged in. Where i marked with red that side is completly shorted to ground, but the 12 volt is seems to be ok.

[Viktor Árvai]

Where the 230V comes in there is no short on the live and neutral when there is no fuse installed if the fuse is installed there is a short between live and neutral.
Also i have changed q205 with not an exact match i have put on a 5cw insted of 5b , i have been told there should be no problem.

[stj]

yellow disc in heatshrink is a MOV - they can short out, other than that, the bridge rectifier can short out

[Viktor Árvai]

Mov Was good after that i started to pull of components it turns out this sucker was the boss of the organisation.
iam assuming its a cap ,leads are shorted, after removing short is gone on the high side.
but there is still some shorts that i dont think its suppose to be.
ill go further into it and post it thank you for your help!!!!

[Viktor Árvai]

the area in the black square is still shorted to ground i suspect the 4 pin mostfett in the middle because its directly connected to the removed thermistor, ill remove it tomorrow i dont have any solderwick left.
ill keep you updated thank you for the help!!

[stj]

the green part is an inrush limiter, it's supposed to be low-ohms and as it heats up the resistance drops even lower

[Viktor Árvai]

so if i understand correctly this can be a potential cause for poping fuses and tripping circuit breakers?
should i try just changeing this part? i dont want to damage it further, and as i wrote there is a section what is still shows as short and that is directly connected to this limiter .

[stj]

the green part is probably fine, what is printed on it?
like i said, check the bridge rectifier - a 4 wire pack of diodes that has AC mains going in and dc going out to the big capacitor(s)

[Viktor Árvai]

the green part is 15s1r3m it should be 1.3 ohms and that is the reading i get.i have pulled the rectifier its a gbu608. the left and right pair of legs have connection to each other so 1 to 2 and 3to 4 where is no connection it mesures 0.8 megaohm like from 1 to 4 or 2 to 3, i think this should be alright.and i find a rectifier diode LT7b30 s3j and this is shorted from both sides.
on the line that goes from the rectifier dc to the big cap i still have a short
c8a is shorted i pulled it of it show 2.6 nf dont know that suppose to be ok or not .but after removing the short was still there.

[Viktor Árvai]

i think the rectifier is bad i have followed a tutorial and it seem that this one is busted.

[stj]

a rectifier is 4 diodes, each diode should have a voltdrop of around .4 to .6 in one direction and be open-circuit in the other direction.
no pins should be shorted in any combination.

[Viktor Árvai]

Its definetly toast , ac pin is shorted to positive . Can this short kill something on the 12v side?

[Viktor Árvai]

i got a new rectifier installed now the high side is okay but where the 12 volt starts there are some shorts in fact the whole line is shorted what goes into the big cap.
also the s3j rectifier diode is also toast that connects the 12v + from the rectifier to the big cap.
maybe one last tip what most likely burned?
Thank you for your help it was really a big help , its my first psu repair so i really have no ide what is what.

[Viktor Árvai]

forgot the picture sorry everything marked is shorted to ground.

[stj]

check D10 on the under-side

[Viktor Árvai]

0.411 voltage drop from one side and ol from other

[gcrezz]

Typically I will not repair a PSU in these side they are so inexpensive to replace. However, if you are intent on fixing it, I suggest looking at the pwm ICs and any of the 3-legged fets and mainline high voltage caps. Your fault is likely on the low side. I've never seen a short on the high side in any psu before. If your still unable to find the short, I suggest using a thermal cam.

[Viktor Árvai]

Thanks for the reply, im still waiting on a diode, i had not got to time for it , i will go on to the low side high side is fixed i will update if ill find anything , ill check the pwm ics and mostfets thanks for the tip.