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fanbus replied to Schematics iMac A1418 820-3482-A

in BIOS & Schematic Requests!

10-28-2019, 02:34 PM
Re: Schematics iMac A1418 820-3482-A

Hi, I found this thread while looking for schematics and boardviews for the same board. Looks like both schematics and boardviews do exist, though only on paid sites...

Buuuuut... I was able to download the boardview.

EDIT: I also found the schematics. ...

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Last edited by fanbus; 10-28-2019, 02:52 PM. Reason: A very good reason :D
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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

05-22-2015, 02:45 AM
Re: Power supply build quality pictorial. part 2

I've got the same PSU. They gave it to me because it wasn't working fine. It turned on with the green-black connection, but not with a computer. I saw that bulging CapXon when I first opened it, but I didn't bother about it until the unit didn't want to turn on. Then I replaced that cap (I don't remember which brand/model I used) and it worked perfectly....

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

05-04-2015, 03:22 PM
Re: Power supply build quality pictorial. part 2

I said this PSU didn't have any critical cap in the primary part. I also had a PSU with a failing cap on the 5VSB filtering stage which managed to kill 5 motherboards.

They are used to drive the switchings a bit harder, aren't they?

I think it may have one, but I'm not sure if the thermistor I found hidden in a coil is from the fan controller.

ALL caps there are NICON except for a single BH next to the 5VSB diode. Luckily this...

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

05-01-2015, 06:10 AM
Re: Power supply build quality pictorial. part 2

OK, finally I found 2 MBR20100CT for the +12V.

I also replaced the capacitors in the outputs.
- 3.3V: 2x 1000μF 10V --> 2x 2700μF 6.3V
- 5V: 2x 1000μF 10V --> 2x 3300μF 10V
- 12V: 2X 1000μF 16V --> 2x 3300μF 16V

I still have to check the 5VSB caps. Do I need to replace the small caps around the IC's?

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

04-24-2015, 06:00 AM
Re: Power supply build quality pictorial. part 2

I agree. I wasn't sure if it was enough, but I didn't have any other matched pair.
I haven't got any matched pair able to handle the peak voltage you say and the only electronics shop in my island hasn't got any. Do you think a clamp will work?

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

04-18-2015, 06:25 PM
Fake Tacens: The first improvement session.

Hello again.

In my PSU I did:

- Replaced Cheng 470μF / 200V primary caps with OST 680μF / 200V.
- Replaced 13007 transistors with 13009.
- Replaced 5V rectifier SB2045CT with 2x SBL2040CT
- Replaced 3.3V rectifier SB2045CT with SB3045ST
- Replaced 12V rectifier F16C20C with 2x SB2045CT (The old ones from the other channels)

I would like to have:
- 1x 3300μF + 1x 2200μF (before and after the pi coil, respectively) for 5v and 3.3V.
...

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

04-05-2015, 01:30 PM
Re: Power supply build quality pictorial. part 2

The coils are tiny. They are about 1 cm tall.

Fan is quite slow but I may replace it or speed it up. It's not very noisy but it outputs a decent amount of air.

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

04-05-2015, 01:06 PM
Re: Power supply build quality pictorial. part 2

I've got two 13009 TO-3P from another power supply. That one had a 5VSB with a 2-transistor circuit with no critical electrolytic. It had a swollen cap on the secondary though. That PSU managed to kill about 5 MB's (One survived when tested some months later)

I supposed it was in parallel with the coil but I didn't check. I found a coil with the cap inside.

I know. I'll upgrade all the caps at least in capacitance.

I've only...

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fanbus replied to Power supply build quality pictorial. part 2

in Troubleshooting Power Supplies and Power Supply Design

04-05-2015, 05:24 AM
Re: Power supply build quality pictorial. part 2

Hello everyone.
I bought a Tacens case and it came with this PSU inside. I didn't use it much because the MB had an EPS12V connector and I used a Delta 450W server PSU instead.
I would like to know who manufactured this PSU (doesn't look like a Tacens) and if it's worth a silicon upgrade. I don't have good caps for it.

Box is plain grey with a 12cm fan covered with a wire grille. Fan is an Evercool EFS-12E12L. 12cm with white blades and black frame.
Label has got no UL number. Here it is:
...

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fanbus replied to New Members - please post your introductions here

in Announcements & Related News

04-04-2015, 11:02 AM
Hello everyone. I came across this forum while searching the OEM of a fake Tacens PSU. I noticed how much people knew about OEM manufacturers and I wanted to join and learn.

I've got experience with electronic equipment and I think my knowledge is worth sharing. My English level is high even though I'm not from an English-speaking country.

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