Re: Xbox 360 PSU failure diagnosis
Thanks everyone!
@CapLeaker I have checked everything on the primary side. The only clue that I have are the 2 blown zero fuse resistors in series with the PWM chip VCC. NCP1377 VCC to ground measures 300k, so it's not a dead short. What else could cause these resistors to fail? I've replaced them with some wire, but that only made the third resistor in series blow. 5vsb, which uses the same power source, works just fine. This leads me to believe that there's something wrong with the NCP1377 PWM chip. What do you think?
Here's a quick...
nick122
Senior Member
Last Activity: 10-16-2023, 03:41 PM
Joined: 07-14-2016
Location: in space
-
Re: Xbox 360 PSU failure diagnosis
Thanks for letting me know! In that case, this PSU definitely uses a discontinuous design.Leave a comment:
-
Re: Xbox 360 PSU failure diagnosis
Update: I found this strange (to me) inductor(?) that sits in between the transformer output and the output filter, it seems to just be a copper bridge running through a ferrite core, which is wound with thin wire. The small coil seems to be controlled by some SMD MOSFETs. Is that supposed to improve efficiency compared to a regular coil or is it something completely else?
Update 2: I tested the optocouplers, and they appear to be good too.
Update 3: The PWM controller is NCP1377, not sure why i kept thinking it war an...Last edited by nick122; 05-22-2023, 01:53 PM.Leave a comment:
-
Re: Xbox 360 PSU failure diagnosis
Thanks for the reply! I just checked the secondary side, there's no short. The caps test fine and the MOSFETs aren't shorted either. They're wired in parallel. I also took some more pictures of the whole board.
As you said, the primary switching MOSFET appears to be good too. I'm still confused about this PWM controller chip, as I can't find anything online. It appears to be an IR part though....Last edited by nick122; 05-22-2023, 12:36 PM.Leave a comment:
-
Xbox 360 PSU failure diagnosis
Hi everyone!
I recently got a bunch of 360 accessories for a good price, among which was also this PSU. It's a unit is rated for 175W (14.2A). OEM is Liteon.
The unit briefly powers on for a few seconds, the green light comes on, and powers back off shortly after the green light changes to red. There is no output voltage, I can't hear the fan running either.
Upon opening it up, there is nothing that would indicate why the unit failed. No burn marks, everything looks good visually. Primary cap is 130uf 450v NCC KMG, secondary caps are 1500uf 16v TAICON,... -
Re: Xbox 360 S - power chime, then powers off
I'm a little late, but I think I can help. Usually when a slim board immediately powers on and then right back off, it has something to do with the main 12V rail PWRGD signal. For some reason, the southbridge isn't detecting the 12V PWRGD signal. The PWRGD signal could be missing because of a short on the main 12V rail, a bad HANA which doesn't generates the PWRGD signal when it should, or a bad southbridge that doesn't recognize the signal.
Keep in mind that it can also be caused by a bad power supply, although that doesn't...Leave a comment:
-
Re: Fake Caps in Xbox 360
Okay, I just wanted to clear a few misconceptions regarding the 360, since there's a lot of misinformation. My friend and I have been investigating why the 360s failed so often and we've come to a conclusion that the GPUs are defective by design. It's very rarely the BGA that's the issue, but the tiny bumps that connect the die with the interposer.
Our theory is that Ati used a very low Tg underfill (70c as far as we can tell)
Underfill is the hard substance which is used to support the bumps due to differences in CTE (coefficient of thermal...Leave a comment:
-
Re: Xbox 360 blown caps
I ended up replacing them with rubycon mfz/mcz from another xbox. It had a dead gpu so there was nothing I could really do
...
Last edited by nick122; 07-24-2019, 12:21 PM.Leave a comment:
-
Re: Xbox 360 blown caps
Hzs are rated for 2200uf 6.3V and they are vrm output caps I suppose, while kzjs are 1500uf 16v, probably input filter caps. I have a ton of ucc 820uf 2.5v polymers lying around. Can I use them instead? Also, this particular 360 is on 7357, so I might jtag it too...Last edited by nick122; 07-24-2019, 05:25 AM.Leave a comment:
-
Xbox 360 blown caps
I recently bought an old 360 because it had a really old dashboard and was dirt cheap. This particular unit was still sealed (had the microsoft warranty sticker) and works just fine. But after opening it up, I couldn't help but notice 8 blown nichicon hzs (0601) right by the cpu heatsink and 2 blown kzjs. Should I replace them and if so, what kind of capacitors should I order? -
Re: I might have gotten scammed
Update:
The seller finally responded. Replaced it with another one. This one seems to be working fine.Leave a comment:
-
Re: I might have gotten scammed
i5 2500k @ 4.1 ghz
sabertooth z77
hyperx fury 2x4gb ddr3 1866mhz
256gb ssd
evga 600w 80+ bronze psu
got it w/o the gpu for 120...
I've heard of "reflowing" but does it last, after it had obviously been reflowed before? I dont want it to fail after a month... I want a reliable little machine not a ticking time bomb
tried calling the seller, his number is still down...Last edited by nick122; 09-05-2018, 11:05 AM.Leave a comment:
-
I might have gotten scammed
Soo I got a deal on an r9 270x 2gb graphics card for 40 bucks... a good price for a relatively modern card. We met at his place, he showed me that the card was in fact working and I went for it. Came home, installed it into my budget gaming pc and it was all good... for 3 hours... after about 3 hours of moderate usage, the screen froze. I restarted the computer and the screen was all messed up (artifacts, etc). Turned it off let it sit for a while and came back an hour later. After an hour, same thing. It wouldnt even boot into windows, no matter what I tried. So I took the card out. Upon closer...Last edited by nick122; 09-03-2018, 06:34 AM. -
Re: Old 360 trace repair
Probably. At first those things are a pain in the a$$ to remove. But after removing em dozens of times they come off pretty easily. I actually damaged a board whilr removing an x clamp. It was an old zephyr. Still worked tho. Opened it up to change the thermal paste and while I was removing the gpu x clamp my screwdriver slipped and ripped like 10 of those little smd caps under the southbridge. Surprisingly the thing still worked afterwards but boot times were pretty messed up. Sometimes it took over a minute to boot.Last edited by nick122; 08-22-2018, 04:22 PM.Leave a comment:
-
Old school seasonic 300w
Seasonic ss-300fs apfc from early 2000s
Got it on flea market for 5 bucks. Looks like a nicely built unit. Single transistor forward w apfc. Caps are teapo/pce tur and a single kzh. Primary cap is a samxon lp 330uf 450v. 30a on 5v, 28a on 3.3 and 15a on 12v...Last edited by nick122; 08-19-2018, 05:51 AM.Leave a comment:
-
Re: Old 360 trace repair
Holy crap. The thing actually booted. Uploaded a pic....Leave a comment:
-
Old 360 trace repair
So I got a 360 off of ebay for like $5. The seller said that he doesnt have a power brick to test it out (which I highly doubt honestly) but I got it anyway. It's a launch console in mint condition. Tried powering it on, rrod after 30 seconds error code 0022... opened it up and it looked alright til I pulled the mobo out... somebody stabbed the board with a screwdriver... and its on the gpu - memory bus... should I try repairing it or is it a waste of time? -
Re: lc power lc 600h apfc doesn't turn on
There's some kind of sticky brownish thing underneath it. I'll upload pics later.Last edited by nick122; 10-07-2017, 03:48 AM.Leave a comment:
-
Re: xbox 360 xenon
AFAIK 0010 is a southbridge problem, most likely cold solder joint. reflowing should solve it. those old 360s had a lot of problems with bga. if the error doesn't go away try reflowing the gpu. I reflowed A LOT of 360s and about 70% of em were up and running after that, but those 30% had some sorta "DIY youtube mod" that literally killed the gpu. A dead gpu usually throws 0020 and 0022 and a dead cpu 0002, 0003. That's from my personal experience.
cheers and good luckLast edited by nick122; 10-06-2017, 02:22 PM.Leave a comment:
-
Re: lc power lc 600h apfc doesn't turn on
Also I've just noticed that the "SC" 47uf 50v cap near the 5vsb transformer is leaking. SC probably stands for sh!t capacitor
. Is that what caused the 5vsb IC to blow?
Last edited by nick122; 10-06-2017, 01:46 PM.Leave a comment:
No activity results to display
Leave a comment: