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Eee PC 1011PX/1011PXD schematic/bv needed
Does anybody happen to have one? Thanks!
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Asus Zenbook 13 UM325S schematic needed + RAM upgrade options
Hi everyone!
I have a Zenbook 13 which could really use some more ram, as the measly 8gb it currently has is definitely not enough
I’m aware that the ram is soldered, I can do bga so it’s not an issue
The stock ram, according to cpu-z is sk hynix h9cnnnbkmmlxr-nee (16gbit, 4267 lpddr4x), presumably 4 of those
I’ve been doing some research and have found a potentially compatible sku, h9hcnnncpmmlxr-nei (32gbit, 4267 lpddr4x)
I assume I’m also going to need to configure the straps, which would require a schematic… unfortunately,...
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Chieftec (Delta) GPS-450AA-101 A repair and possible upgrade options?
Hi everyone!
I’m trying to diagnose (and perhaps even upgrade) this Chieftec (Delta rebrand) power supply from an old rig
The computer just stopped turning on one day. No explosions, no magic smoke, it just died.
There is no 5vsb, and nothing happens when I try to jump start it, it’s completely dead…
I took it apart and nothing looks out of the ordinary. The fuse isn’t blown and the main cap gets charged (found out the hard way lol)
The caps are mostly ltec with a samxon primary, none of which are bulging
Any ideas what I should look...
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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...Last edited by nick122; 05-25-2023, 11:14 AM.
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Re: Xbox 360 PSU failure diagnosis
Thanks for letting me know! In that case, this PSU definitely uses a discontinuous design.
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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.
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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.
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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,...
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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...
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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...
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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.
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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.
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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?
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Re: I might have gotten scammed
Update:
The seller finally responded. Replaced it with another one. This one seems to be working fine.
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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.
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