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alright, so the PSU it's not DC-DC and the voltage is controlled by switching the primary mosfets. Try checking the voltage comparator in the line that its unstable, they get bad pretty often. They are commonly TL431A or other kind of comparator. In this PSU it may be in a SMD version....
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there are regulation modules for each reails that you can put apart of the main PCB? also, would you please share the specific model of the PSU?...
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I wouldnt replace it at all, Teapo aren't that bad (2nd tear). but if you really want to replace it you can replace with a 1st tear capacitor of 105 degrees. these are the 1st tear brand capacitors:[LIST][*]Rubycon[*]United Chemi-Con (or Nippon Chemi-Con)[*]Nichicon[*]Sanyo/Suncon[*]Panasonic[*]Hitachi[*]FPCAP or Functional Polymer Capacitor (ex-Fujitsu caps segment, which was bought by Nichicon)[*]ELNA[/LIST]- I wouldnt replace it at all, Teapo aren't that bad (2nd tear). but if you really want to replace it you can replace with a 1st tear capacitor of 105 degrees. these are the 1st tear brand
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thank you very much for your consideration, it was a pleasure helping you, I learned a lot with it! maybe you can use a current limiter diode...
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i don't know exactly how this PS4 PSU works but in ATX PSU's sometimes we have some open trafo. maybe one of the trafo's had open the circuit and thats why it shut downs when it has some kind of load. the wire inside of the trafo may doing just a little contact but when it get load and heats up it lost contact. it just a theory, worth checking. I just don't know if you can buy these trafo's
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good! guess i'm going to pay more attention on the shotkky diodes from now, i've never saw one shorted until today. living and learning
keep the good work!!!...
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take a look at this:
[url]https://www.youtube.com/watch?v=Ykz1Hz_n4-c[/url]https://take a look at this:<br /> [...1Hz_n4-c[/url]
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congrats champs!!! happy you fixed it, I'm sorry i coudn't help more than i did...
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sorry, i though it was a flyback psu but since there is a hot side driver it is probably a half bridge PSU. most part of the defects with half bridges PSU's that i saw were with voltage regulators in the secondary, worth a try cheking them. since the PSU works properly until there is a load and it is a halfbridge PSU i wouldn't be worried about the hot side driver....
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i don't know a lot about ps4 psu's but most of the psu's that i've worked had a voltage comparator on the secondary that would return a feedback voltage through a optocoupler. i would check tthat system and also the driver of the mosfet (probably a pwm/voltage monitor on the secondary)...
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yeah, you can just change the resistors. i would place a ponteciometer instead of a resistor, so you could regulate it easier. by the way, how do you know the voltage reference of each TL431? i didn't knew about this spec of TL431, just thought that every TL431 was identical (beside of after letters)...
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it is a fusistor. you can just jump it but you would have no protection. just replace for another 0ohm fusistor or something close to 0...
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my fault, i misreaded it. well, thats good. did you tested the voltage comparator of 3.3v? if i'm well remembered there are 3 optocouplers: 1 for stdby, 1 for 12v and another for 3.3v. try checking the last one and follow the trails...
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uuuuuh now everything makes sense. you're right! they aren't the same thing, the feedback voltage of the TL3845P can go up to 6.3v, and the UC3844 is limitted to 2.58v, the PSU is probably overvolting the feedback pin and that's why you're getting so high voltages!!
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try getting out the TL431 of 12v and 5v rails and test in a component tester. since all of this symptom is pretty strange i would also test the optocouplers with a multimetertry getting out the TL431 of 12v and 5v rails and test in a component tester. since all of this sympton is pretty strange i would also test the optocouplers with a multimeter
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you're right! thans for pointing my error, these psu's work without active PFC...
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yeah, maybe the TL3845 is driving the mosfets crazy. there is always a fix, don't worry about it. are you sure you only have 1 comparator? i see a lot of TO-92 transistors in the board, they may not be exactly TL431 but they may be acting as voltage comparators. these half bridge PSU's often get a bad voltage comparator and the voltage goes just crazy....
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