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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-09-2017, 06:26 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

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

[URL="https://youtu.be/AWoBHj8qMH0"]https://youtu.be/AWoBHj8qMH0[/URL]

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

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

[URL="https://youtu.be/AWoBHj8qMH0"]https://youtu.be/AWoBHj8qMH0[/URL]

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

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

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-08-2017, 10:43 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

What does it means? --> [I]You SHOULD be doing this work with an Isolation Transformer.[/I]Re: iMac 24 PSU LITEON PA-3241-02A1 250W

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

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-08-2017, 10:42 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

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...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-08-2017, 10:29 AM
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...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-08-2017, 10:11 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

fuse dead one more time...

Trying to find new shorts... ...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-06-2017, 05:38 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

I know ...

Yes, the short is between 1 and 2, I just check one more time. What do you think?

[B]NOTE:[/B] I´m checking the circuits you draw in green which run 1 and 2 and It´s correctly: could be the TEA1750T ??? A short between pin 13 and 16 ??? It´s the only option, I think...

[B]NOTE 2:[/B] NEWS ¡¡¡ NEWS ¡¡¡

I´ve tried to extract the TEA1750T because all the "checks" in the circuit between 1 and...

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Last edited by LuisJCC; 03-06-2017, 06:39 AM.
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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-03-2017, 11:14 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Hi Master, I prefer to answer you quoting

OK master, I´ve extracted the mosfet of the pcb and checked it (same the video you link me), and the mosfet (out of the pcb) is OK. It isn´t shorted between source and drain, and using the dischard mode, is ok too. If I try in the holes (pads) of the pcb where the mosfet is fixed, is shorted the holes where insert pins of gate and drain (1 and 2)... ¿? I didn´t check it before fix the new one (remember old mosfet was completely shorted)

...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-03-2017, 08:21 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

OK, thanks ¡¡¡ I didn´t know it. And about the theme...

*Sorry, our posts cross them.

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Last edited by LuisJCC; 03-03-2017, 08:50 AM.
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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-03-2017, 04:39 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Hi ¡¡¡ I tested all the diodes of the PCB and change two diodes which have shortcut (BEEP¡), then I fix two new ones and... still shortcut. I tested the diodes out of the board and was OK...

what do you think about this? Thanks for all ¡¡¡

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-02-2017, 08:12 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

thanks for the bulb suggest ¡¡ cool. Last question, how can I try to switch on the PSU an check the volts in pinout? Do you know where can I check volts in the pinout?

Thanks master ¡¡¡

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-02-2017, 08:05 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Ufffff difficult to understand (sorry for my english)...

when you say "It sounds like the replacement 6R165P is defective. These are static sensitive, so replace it again, and test it -before- you install it in the board."... what does it mean? I extract the 6R165P an check it out of the pcb, and all the legs have shortcut (1-2, 1-3, 2-3) "beeep" in diode mode... I think it´s bad, then change it for a new one.

Then you say "In Diode Test, mine shows no resistance between all legs, except...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

03-02-2017, 06:29 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Ok master, thanks for all. About the question if I´m testing the PS in bench or computer, I don´t have the computer in the laboratory, I´m working with it on the bench.

Other, I´m using this class of fuse because is impossible to find the original (same like original) in this moment... what is the different between both?

I've checked the comon and hot and don´t have shorcut, but... testing and testing arrived to a 6R165P of Infineon... and it has shorcut in all his legs. It is near of the...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

02-21-2017, 05:51 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Ok thanks ¡¡¡

News and updates about the LITEON IMAC 24 power supply:

First, I´ve seen the fuse, is broken, cut. In this case I´ve changed for a new one (not equal encapsulate) 5A and 250V... but died one more time.

I think the mtb has a shortcut but, how can I start? What do you think about a shortcut in this class of mtb? Maybe it´s a difficult question, and large but

A pictures of the mtb

...

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LuisJCC replied to iMac 24 PSU LITEON PA-3241-02A1 250W

in Troubleshooting Power Supplies and Power Supply Design

02-18-2017, 06:01 AM
Re: iMac 24 PSU LITEON PA-3241-02A1 250W

Hi ¡¡ I´m new and I´m trying to diagnose a similar fail witn the same mtb, but I don´t find this mosfet, at least with this name. Where can I find it? In the back part of the mtb I can see to IC with this encapsulate

1.- 50N04-05L
2.- BUK9209-40L

Both have the same package but, what is the equivalent to the mofset 060N03LG?

And a question more if it's possible: where can I find the schematics of this board? I´m for the old school and I prefer start with the schematics....

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LuisJCC replied to New Members - please post your introductions here

in Announcements & Related News

02-18-2017, 05:51 AM
Re: New Members - please post your introductions here

Hi guys ¡¡¡ I´m Luis from Spain. I live in Fuengirola (Málaga), a village that you can find in the map of the south of Spain. It´s in the west coast of the Costa del Sol. It´s like California hehehe.

I´m 40 years old, and I have a superior degree in electronic projects and products developent and I´m trying to finish a electronic engineering skill (late, so late)

Sorry for my english, I try to improve it all the days. I works for a little company which repair all level 3 motherboards of cells,...

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