Jeekul

Its original board in original case. Power supply wont give almost any voltage on any pin when the fault is on. Its been working since i posted the previous post. Im at a dead end.

Hello guys, i'm back at it again and i'm starting to think this is actually PSU problem. And that is because i dont have the 5volts on the red wires at stb or anything else on the PSU connector. Only under 0,5v on some of them. Today i (again) took off the PSU from the xbox and just probed it around transistor/mosfet legs and did not find anything that i understand to be a faulty component. The big transistor or mosfet type thing on the low voltage side heatsink has outer legs shorted but i dont know if its a problem. After this probing i put it back to the box and wtf, it powers on again. SO. Im thinking PSU is the problem. Also when i measure the transistor on the side of the xyclops chip, on the left i have 0.33v and on the chip side legs 0v. Please, point me to the right direction or im forced to bail out and this thing probably goes to the bin

I think its 50 pieces from china, for about a whopping 3 dollars. Lol. https://www.aliexpress.com/item/1005005425549024.html?spm=a2g0o.order_list.order_list_main.5.45941802WvP3Hj

I ordered cyclops chip transistor from aliexpress. lets see how this goes.. maybe a month when they arrive.

Oh yeah, little slow haha. My english is not the best always. But i need more info, what reading must be off to indicate that/those transistors to be bad?

???

Sorry for long reply. I measured around the cyclops chip transistors. On the "4,3v" side i have 0,85volts and on the otherside i did not have time to measure because the xbox suddenly came alive again. This is funny.

Ok hi from Finland. I'm repairing and modding a Xbox og 1.6 with this samsung psu. The 3.3v and 5v stand-by voltages come and go, i think there is something to do with heat because it worked for a while when i resoldered almost every single solderjoint on the board. I have replaced the 2 big caps and that did fix the original issue of completely dead. I have replaced all the bigger caps on the mobo. Mobo works just fine when the psu gives the power needed. Can someone point me in the right direction? I have been stuck with this for over a month and i'm doing this free for my friend. EDIT: Just tried to measure the psu once again and had no 5v. Then i plugged mobo connector back in and plugged ac plug back on and the f*cking thing works again.

From finland, with xbox original with bad psu.