High Power HP1-J600GD-F12S

[redbaron1007]

I got a High Power HP1-J600GD-F12S on the bench today that was killed by roaches judging by the dead roaches and large brown spots in the housing next to said roaches.

I was able to identify all the blown smd resistors on the board aside from the one located at R69. I wasn't able to figure out what any of the marking on the resistor was supposed to be and with how little of the marking was left I wasn't able to really make any guesses about what it could be from the surrounding components. It is connected to pin 1 of Q11 (4N65SFA1K) which looks like it is the gate .In the sample circuit in its datasheet from CR it mentions once a 50ohm resistor on the gate in a test circuit and in another datasheet from Unisonic it mentions a 50Kohm resistor on the gate in a gate charge test circuit. that is the most lead I have for what it might be, but that is a pretty large range to work with. The other end of R69 is connected to the positive of some capacitors and a zener diode labeled ZD1.

The only other IC around the resistor is the pwm controller (SI8016HSP8), but I'm not able to find anything about the IC online other than an eevblog post about not finding a datasheet and the fact it is used in the corsair CX650. As far as I can tell the resistor isn't connected directly to the pwm controller, but it felt worth pointing out incase anyone has any photos of other psu's that use this same IC in a similar way.
https://www.eevblog.com/forum/repair...16hsp8-pwm-ic/

I would appreciate any help I can get on this one. I don't really need this PSU to work I just wanted to take a crack at it since it would be nice to have around for testing PC's or whatever else I say I'll do with the 5 other working ATX PSU's I have on a shelf right now.

[R_J]

Is this what you need, I had no problem finding it

[CapLeaker]

Here you go. Data sheet for the PWM. To me you got two resistors on the gate drive?

R_J has faster internet than me lol

[redbaron1007]

Is this what you need, I had no problem finding it

That's exactly the chip I was looking for. I love and hate how hard it is for me to find stuff sometimes, but other people make it so easy.

Unfortunately it is exactly what I'm looking for and not at the same time I can see it outputs to an external power mosfet that I'm assuming is the Q11 (4N65SFA1K) on my board with that resistor in between, but unless I missed it in the document it didn't have a value for that resistor. The value of that resistor is the main thing I'm looking for a the moment. If I can find the value though this datasheet is going to be extremely helpful if the chip is dead to. Not holding my breath its ok but won't know until I replace the visibly blown components around it since it's at least not shorted on any of it's pins.

[redbaron1007]

The more I look at the burnt resistor the more I swear it says something like 3 - 4/9, but I'm not really sure because none of the resistors on the board have 3's that are printed like that and a 9 makes more sense than a 4 given the font used on all of them. Also I've never heard of an smd resistor that ended in anything as high as a 9. Don't think this adds much to the discussion, but just seems like what I'm seeing even though I don't think it's there at all.

[R_J]

There should be one resistor between pin 5 of the ic and the gate of the mosfet and a resistor from the gate to ground, is R69 from gate to ground? if it is, do you know the value of the other resistor? The resistors are chosen for the best operation of the mosfet and not by the ic

the resistor from gate to ground is usually in the KΩ range.
with the gate resistors bad and those mosfet source resistors blown, the drive ic SI8016HSP8 is very likely bad as well

[redbaron1007]

There should be one resistor between pin 5 of the ic and the gate of the mosfet and a resistor from the gate to ground, is R69 from gate to ground? if it is, do you know the value of the other resistor? The resistors are chosen for the best operation of the mosfet and not by the ic

I'll have to check in the morning. I've put everything away for the night. I'll report back in the morning with that info.

[CapLeaker]

If the gate drive resistor like 100 ohms, the pull down resistor is like 10k. These are ballpark figures. Those resistors do not have to be totally exact either, as these are chosen for the mosfet not to get into certain conditions. A few ohms here or there do absolutely not matter on the gate drive. Let's the what the actual gate drive resistor that goes to that PWM and sits next to the blown resistor (pull down) has for a resistance.
These PWM may be blown since it got full power from the MOSFET to the PWM gate drive pin (all 3 legs from the MOSFET were shorted together).

[redbaron1007]

There should be one resistor between pin 5 of the ic and the gate of the mosfet and a resistor from the gate to ground, is R69 from gate to ground? if it is, do you know the value of the other resistor? The resistors are chosen for the best operation of the mosfet and not by the ic

the resistor from gate to ground is usually in the KΩ range.
with the gate resistors bad and those mosfet source resistors blown, the drive ic SI8016HSP8 is very likely bad as well

The other resistor between the gate of the mosfet and the gate of the pwm controller is a 33ohm resistor. The best I can make out on the marking to be 330, it has a small hole in it, but I'm pretty confident in that number. Looking at the blown one I'm trying to identify I'm an idiot it is connected to ground I was looking at the wrong cap when I made my original post about them being connected to the positive of the some capacitors it's connected to the negative.

If the gate drive resistor like 100 ohms, the pull down resistor is like 10k. These are ballpark figures. Those resistors do not have to be totally exact either, as these are chosen for the mosfet not to get into certain conditions. A few ohms here or there do absolutely not matter on the gate drive. Let's the what the actual gate drive resistor that goes to that PWM and sits next to the blown resistor (pull down) has for a resistance.
These PWM may be blown since it got full power from the MOSFET to the PWM gate drive pin (all 3 legs from the MOSFET were shorted together).

So it would be safe to assume it would be a 33k resistor that has all it's markings blown off? only source and drain of the mosfet are shorted the gate doesn't connect to either leg at all anymore. When I put it into my cheapo transistor tester it's showing it as a 0.53ohm resistor across drain and source and not detecting the gate at all. I'm in aggreence though I should probably just change the chip since they're not super expensive in the first place.

[CapLeaker]

Look very hard at that resistor. I can read clearly 3, the next number could be a 4 and the last number a 3. Makes it 343 = 34Kohm resistor.
However a 34Kohm resistor isn't standard, but a 33k ohm is (333). If I would be doing that repair, I'd put a 333 in there and call it a day.
Measure the MOSFET with your DMM. Probably all 3 legs are shorted together.
clean carefully that burnt resistor with 99% alcohol and see if you can read it better.

[Sam Scarbo]

https://newscrewdriver.com/2022/12/1...1-j600gd-f12s/ has a teardown article on this PSU. They have a PCB picture but not clear enough to read the component printings. You may try your luck to leave a comment there asking the author on the resistor value.

[redbaron1007]

https://newscrewdriver.com/2022/12/1...1-j600gd-f12s/ has a teardown article on this PSU. They have a PCB picture but not clear enough to read the component printings. You may try your luck to leave a comment there asking the author on the resistor value.

I saw that teardown/article in my initial looking and tried asking in a comment, but I guess WordPress never posted the comment. Plus at least in my opinion trying to figure it out like we are on here is fun/educational and generally helpful for anyone in the future looking for stuff like this or this exact thing. Educational benefits aside though would be super nice if the guy in that article reply's and is able to give me the exact value/code of the resistor.

Regardless I'm probably going to go with what CapLeaker suggested the value is based off how these types of circuits usually work/prior knowledge with atx psu's.

Look very hard at that resistor. I can read clearly 3, the next number could be a 4 and the last number a 3. Makes it 343 = 34Kohm resistor.
However a 34Kohm resistor isn't standard, but a 33k ohm is (333). If I would be doing that repair, I'd put a 333 in there and call it a day.
Measure the MOSFET with your DMM. Probably all 3 legs are shorted together.
clean carefully that burnt resistor with 99% alcohol and see if you can read it better.

I did check the mosfet with my DMM first and it's only reading a short on the drain and source. From gate to drain or source reads 0L even when I swap the leads around. The resistor in the picture is after taking some IPA to it a couple of times to see if could see anything better. I did take a brush and some alcohol to it after the I took the photo, but it's still just as legible as in the photo.

I'll probably source some resistors and the mosfet in my next digikey/mouser/lcsc order. I've probably got plenty of resistors on other boards or in a box somewhere, but why look for them when I can spend $0.10 for more that I don't need. I know I'll have to buy the mosfet though I looked through all my new and salvaged mosfets and didn't have it at all. Luckily it's not difficult to find anywhere online.

Guess I'll report back in a week or two when the parts come in and I'm able to get them installed.