Re: Polyester Capacitor ESR
Thanks...
darjness
Member
Last Activity: 07-03-2023, 07:15 AM
Joined: 11-15-2012
Location: Faro
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Polyester Capacitor ESR
What should a polyester capacitor 22nf 1000vh ESR should be ? I´m getting ~77 Ohms. -
Re: Imac 24 PSU Liteon PA-3241-02A
I was getting +12v on standby,i tried other brand mosfet and its dead now. I´m currently looking for a cheap replacement psu. Are all a1225 imac psus compatible with each other ? Or i need same psu as old one ? Do you know where i can get a psu for it? Preferably in EU.
Thx...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I dont know how to test the -12v, theres only +12v and ground, could -12v be shorted to ground, or is it normal ?...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I cant find anything shorted and nothing is leaky , Maybe something shorting on motherboard when turned on ?...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
Hey,
Mosfet arrived, tested first good values, soldered to pcb,tested mosfet again and all good, power in,voltages are good, power mac on, fans twitch and 3 leds, I power the mac off test mosfet again and its shorted.
Any tips what could be the issue ?
Thx...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I found now the old one and tested it again and it has 20 ohm's on drain and gate...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I think the best thing to do now is to wait till monday, when i receive those new mosfets, and than i will test it before install. I found that the problem is this mosfet after searching the net and bad caps forums, they fail very often and most of times psu runs after replacement, also chinese replacement psu´s looks on pictures like they replace this mosfet only and sell them.Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
Yes, the original is shorted on all 3 fets, the new one source and drain are shorted and 59 ohm's on drain and gate...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
Could it be that i bought a bad mosfet ? When i got it i was so excited that i would have my imac up and running that i did not test it before install, since new one is bad also now, i ordered more 5,Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I tested it, multimeter beeps for half a second than goes to 1 , theres a 470uf 16v capacitor on ground and those 3 pins, pins number are 8 9 10 ,Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
Source goes to 3 pins that go to the motherboard, Gate comes from somewhere psu and only have voltage when mac is on, drain comes from +12v that also goes to motherboard and its always on. on mofset schematics its says Fast switching MOSFET for SMPS...Last edited by darjness; 03-13-2015, 09:26 PM.Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I tested voltage without the mosfet. With mac off i get 12v on drain, 0v on source and gate, with mac on i get 12v on drain, 21.8v on gate and 2.8v on source...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
I just removed it. pin 2 and 3 are shorted both ways...Leave a comment:
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Re: Imac 24 PSU Liteon PA-3241-02A
New mofset 060n03lg has drain and source shorted, is that normal ?Leave a comment:
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Imac 24 PSU Liteon PA-3241-02A
Hello,
My imac died, wont turn on, only 3 leds on, first i tough that motherboard died, but after some search on internet i found that psu tend to fail on those imac aswell. Mofset 060n03lg was shorted, i replaced it, also i replaced all 2200uF 16v caps, but mac still wont power on, fans twitch when i plug the power cord and also when i press the power button. Hdd spins, but if i have many thing running in house like heaters very quickly shuts off, if not it keeps on for long.
Any tips what it cloud be ?
Thx
[url=http://postimg.org/image/spfp3ksxt/full/][/url] -
Re: Please help broken motherboard part
Had similar issues wit an ASUS laptop, had to reball it...Leave a comment:
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Re: Please help broken motherboard part
Added one 220uf and one 330uf, defensively more stable, at least didn't freezed or rebooted for now, hope its permanentLeave a comment:
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Re: Please help broken motherboard part
I have a mobo for parts, with has 330 95XS1 d and 330 95X1P d caps on it, but i dont know if they work,...Leave a comment:
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Re: Please help broken motherboard part
I dont know, i bought a nec tokin oe907 replacement where came these caps,
and i have one more with i toke from a mobo and says 330 e69....Leave a comment:
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