iMac 24 PSU LITEON PA-3241-02A1 250W

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

That's all the voltages you will get from the CN1 connector.

Your 24v line is on the single inline 12 pin connector CN2 on the opposite edge of the board. Pin 1 is at the corner next to the mounting hole. The 5 pins 8-12 provide the 24v.

If you have these with a lamp load on them and voltages check, then the supply is good.

I suspect your problem lies on the mainboard/motherboard.

T

[LuisJCC]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Excellent! Yes, that's what I would have done next. It's the only place a short could be between those pins. That's why I drew the trace lines on the picture and sent the IC electrical PDF. Once you examine the circuits they show, it was the only logical explanation.

You figured it out, and that's great!

I hope you can acquire a new one. If you need help finding one, use this link to the Find Chips website - findchips.com .

Good Job!

T

fuse dead one more time...

Trying to find new shorts...

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

You replaced the IC that fast? Where did you get it that fast?

With a lamp in series? The lamp may glow brightly, but nothing should blow...

Since you didn't answer before (Post 78), what is the condition of the fuse? Blackened or just open?

Did you check for the short (again) between gate-drain?

T

[LuisJCC]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Mr. Toasty, what do you think about "bridge" the fuse?... I think it´s bad but... I don´t have another idea to do...

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

That's called Dancing with the Devil. You ONLY do that if you use the lamp in series.

You SHOULD be doing this work with an Isolation Transformer.

T

[LuisJCC]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

With a lamp in series? The lamp may glow brightly, but nothing should blow...

Since you didn't answer before (Post 78), what is the condition of the fuse? Blackened or just open?

T

First I try with the 220v lamp in series but the lamp doesn´t light on (plug the wire to electricity) and I don´t have any volts in the enter of the board... I decided extract the lamp and connect directly to the PS. The fuse dead one more time.

The fuse is only dead, not blackened, only just open. It´s different but 5A/ 250v

[LuisJCC]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

That's called Dancing with the Devil. You ONLY do that if you use the lamp in series.

You SHOULD be doing this work with an Isolation Transformer.

T

What does it means? --> You SHOULD be doing this work with an Isolation Transformer.

[techman1025]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Hi
Next time just test the fets easy diode mode pull the date sheet to see where the drain source and gate legs are reversing your probes a reading from 100 to 400 or more one way reversing probes a zero in other direction is a good working fet. Caps by a good ESR METER ... is some cases it good to pull the fet and check the solder landing pads for short again diode mode on meter red probe on a ground pad black probe on landing only one leg should be grounded.

Techman1025

[LuisJCC]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Mr Toasty, watch the video please do you think is it working ok?

https://youtu.be/AWoBHj8qMH0

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

You must use an INCANDESCENT light. CFL, LED, flourescent are not proper.

Looks like it's working though.

T

[C0C45]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Hi, anyone can tell me the name this mosfet please ?

Thx

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Bob

[C0C45]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Thanks

You were very helpful, now i can buy a new bob

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Marked: 6R165P
Manufacturer (Infineon) Part Number: IPW60R165CP

See attached datasheet.

The original is in a plastic TO-220 package. Appears you can only get those from China. (ebay)

The US suppliers (Arrow, Digi-Key, Newark, Mouser, etc.) have them in the TO-247-3 package per the datasheet. You will need a longer screw to handle that package as a replacement.

Why are you looking for the part? General interest or is it defective? A bad one of those would be odd.

T

[C0C45]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

thanks

This is a imac that come from a PC technical assistance without this mosfet, and they said that this PC had no repair.

I searched for PSU datasheet without luck.

I will buy these mosfet to try understand the real problem.

Thanks again

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Okay!

It is odd for that MOSFET to fail.

Once you replace it, please make sure you use the incandescent lamp in series as I referenced in Post 88 of this thread.

Please be very careful as you are dealing with the Mains power on this MOSFET and surrounding circuit.

T

[C0C45]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

thanks mate,

but the mosfet you tell me is wrong, its too big. You have the PSU datasheet ?

Thanks

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Yeah, my mistake.

The TO-247-3 is the wrong package for this PSU. * Identical electrically.

So, you are restricted to the TO-220 package(s).

In original (plastic) or in earlier versions (metal tab). * Metal tab will need an insulator for the screw and a heatsink mica or silicone insulator.

Looks like you're stuck going to ebay and China for these.

T

[C0C45]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

This ?

http://www.ebay.com/itm/6R165P-Infin...-/251340598076

[Toasty]

Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Yup!

T