Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-15, 18:33

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay I have found an 1A toroid that generates 11.5V on output and made an 5V regulator for 5VSB and 10V regulator for sec aux rail using the 7805's. After putting everything together (including bridge rectifier) I can now power the PSU on no problem. Sure, there's an toroid case sticking out of the …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-14, 18:14

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And scratch that, again.... The transformator is rated for max 200mA (2VA) which is not enough for 5vsb. I do have an 450mA 12v transformator, but that one is on the brink of minimum amperage rating on 5VSB....

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-14, 14:20

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Since it looks like I am nowhere near repairing the 5VSB circuit I decided to go with an 10V psu for sec aux rail and an 5V regulator using TL431 from the datasheet using an BD135 as the NPN transistor and potentiometers for the resistors. Sadly I get 1.71V on the output.... I have double checked …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-13, 16:13

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have soldered in the EEL-19-2005 transistor and the EE-19-2005 one using wires and double checking the pinouts and I still get absolutely nothing on the 5vsb rail and sec. aux. rail. I have no idea what is wrong here...

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-12, 19:51

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Question, on the original FSP 5VSB transformator is it normal for the pin connected with the yellow wire to show 0.3-5ohms to the one near it out of circuit? It doesn't have any passthrough to the 2 pins right next to each other (which both have ~1.8-2ohms). I have found that the smaller EE-19-2005 …

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Re: (SOLVED) Windows XP PRO - STOP C0000221 ntdll.dll error

Posted on 2025-03-11, 05:43

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tbh drive smart is in perfect condition, even after a llf. What's also weird is that after I changed the wallpaper the entire theme went full black.... Since it was unusuable (every pop up, error and file list was pitch black) I gave up on thw virus search.

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Re: Windows XP PRO - STOP C0000221 ntdll.dll error

Posted on 2025-03-10, 14:54

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yep, that seemed to fix the issue. It now boots just fine. Thank you! But this BSOD still gets me to wonder, what type of a virus could corrupt the ntdll.dll? I am sure there was an payload for wimad virus and I think that's all....

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Re: Windows XP PRO - STOP C0000221 ntdll.dll error

Posted on 2025-03-09, 20:44

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have tried looking at the product id of the key I've recovered from this install, but all it means is "xp pro german", nothing else.... As for the ISO could you pull out the ntdll.dll for me, please? I haven't got a lot of time at my disposal...

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(SOLVED) Windows XP PRO - STOP C0000221 ntdll.dll error

Posted on 2025-03-09, 16:26

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, Currently I am trying to repair my old german XP pro install which shows an STOP C0000221 \WINDOWS\System32\ntdll.dll BSOD right after the loading screen. I have tried to: Use all of the options in F8 menu Swap the ntdll.dll with an polish home sp3 retail (changed the error that the size of …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-08, 17:14

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While messing around with this one I noticed that after the voltage drops around .30v there's an weird funny smell inside (not the one before!). If I go over the 5VSB arena I can feel with my face the heat dissipation from that spot. My idea is, before poking inside with my finger when the caps go …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-07, 20:21

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hmm, it looks like my 817 might be a C variant. There's the producer, date of manufacturing, 817, F43 and lastly C. Anybody here that knows if this one is an 817C or is it an normal 817? Okay from TRW server I got the info that it should be an normal pc817. I have replaced it with a new SHARP PC817 …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-07, 17:19

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay I have tried with the 360 and 390ohm and no change at all..... Still 4.2v. Turns out on the old 390ohm resistor was damaged by the 5vsb carnage and now it measures 50k ohms laughing I have no idea what is worng now. Go higher with the resistance?

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-07, 17:04

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

LOL that ain't right either. 390 Ohms --> 330 Ohms is about 15% reduction in resistance, but 5.8V to 4.6V is a little more than 20% reduction, which doesn't make much sense. R13 value shouldn't be that sensitive at all, once there's enough current to drive the LED in the optocoupler. So might need …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-07, 16:21

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I've replaced the R13 (only one near opto coupler which was 390 ohms) with an 330ohm and the voltages are bellow spec (4.56-ish volts). Which is a good and bad thing :) I'll try an 360 ohm next when the PSU discharges. If that doesn't help then idk what will. It didn't help, only made this worse …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-06, 17:21

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay with an 1k in the voltages are down to 5.5v. Still to high though.... And besides now there's an funny smell inside. I cannot describe it but it's like plastic melting or something like that but veery light. Maybe it's from the outside but I can only smell it when there's power to the PSU.

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-06, 16:58

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You need some big enough load on the output for voltage to get in spec, i.e a few LEDs or something like a 100 ohm resistor. Unloaded SMPS outputs are rarely if ever in spec. Actually, on a second thought this doesn't sit right with me... The PSU after replacing all the bad parts for the first time …

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-06, 16:03

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

1k ohm (for good measure) resistor on 5vsb to gnd. Got it.

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-06, 14:44

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay I've replaced that diode with the one above and..... 5VSB IS BACK! ...but again without a catch.. It's waaay out of spec (5.8v!).... I have no idea what else now is screwed. Caps were replaced on both the primary and secondary side... At least the sec. aux. rail is okay (10.20v).

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Re: FSP300-60GTF repair - blown transoptor, resistors, worth it?

Posted on 2025-03-06, 13:35

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay for the PS106R I found an FR107, which should be 1A 700V. It's legs are a tad bit short but I think soldering some copper wire to one pin should be okay. At least for testing. As for the opto coupler I'll just replace it with a new one. Have like 20 of them I forgot about😆

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Re: How to disable the charging circuit on an old 486 motherboard?

Posted on 2025-03-06, 10:17

by

by kotel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think putting an diode on the positive pin should do the trick. Just make sure to put it correctly

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