thank you duncan!
dont know if it's usefult but i attach a photo of the 4 mosfet on the board for completeness
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lele.v
Member
Last Activity: 07-07-2013, 03:46 PM
Joined: 08-19-2012
Location: catania
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Re: replacing NVIDIA 8800 GTX mosfets
thank you duncan!
dont know if it's usefult but i attach a photo of the 4 mosfet on the board for completeness...
Last edited by lele.v; 10-04-2012, 12:42 AM. -
Re: replacing NVIDIA 8800 GTX mosfets
thank you duncanbest, but i already know where to search the mosfet to buy (farnell, because i'm also buying other parts from it).
my problem is that i dont know to search an equivalent mosfet, i'm worried of take no notice of some parameters or other things in the choice of the mosfet, so i prefer to trust of the advices of more experienced people that can search the right mosfet
hope that someone can help me
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replacing NVIDIA 8800 GTX mosfets
hi all!
i'm trying to repair a videocard NVIDIA 8800 GTX.
i must replace the four mosfet near the power plugs on the upper-right of the board.
These are four "Alpha&Omega 4422 BA652P"; this is the datasheet:
[url]http://www.datasheetdir.com/AO4422+download[/url]
I've tried to search this component but i haven't found it... anyone knows a good replace of this component that i can use?https://hi all!<br /> i'm trying to...r-right of the -
Re: Acer AL2416W Power supply problem
dead topic?
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Re: Acer AL2416W Power supply problem
so, if i want to try to repair i must get:
1xR4 10 ohm smd resistor 1206 (right?)
1xQ4 MMBT4403
1xIC2 TDA4863G
1x K3568
1x T3.15AH250V fuse
that's all or i must check other components?Last edited by lele.v; 09-23-2012, 10:23 AM.Leave a comment:
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Re: Acer AL2416W Power supply problem
i understand... so what i can do now? you think i can try to repair or it's bettere to throw all away?Leave a comment:
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Re: Acer AL2416W Power supply problem
@jetadm i've tried but i can't remove R4, too little and even if remove the tin the component doesn't move away :/ is really necessary to test it? i've measured again the resistor after i've tried to remove it and now it reads 129 Kohms
@retiredcaps: all the readings for Q4 are intended to be ohmsLast edited by lele.v; 09-21-2012, 09:45 AM.Leave a comment:
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Re: Acer AL2416W Power supply problem
yes pardon, 1.5 ohms (multimeter set to 200)...Leave a comment:
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Re: Acer AL2416W Power supply problem
yes, on the IC2 it's written "4863G G0718"
i'll try to remove R4 but i'm scared to break it because it's a so little component... :/
for Q4, if 1 is near the writing ic2, 2 the second on the same side and 3 on the opposite side, i obtain the results:
1-2: 1.5
1-3: 19
2-3: 18,5Leave a comment:
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Re: Acer AL2416W Power supply problem
@jetadm123: i know, but i couldn't remove the screw only because there wasn't enough space for the screwdriver.
I think the original problem was the well-known problem with the inverter (capacitors-mosfet-fuses) but i was insecure because i didn't notice any flashlight when turn on the monitor. the display was always black as it was off but the led indicator stayed always green. so, i thought that there might be a problem with the power supply...
@rtech: what is the SMPS? where is located in the board? and how can i test...Leave a comment:
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Re: Acer AL2416W Power supply problem
ok, here are front/back photos of the entire board, front/back of the pfc zone and of the mosfet i removed. i can also provide other detailed photos of other parts of the board if necessary....Leave a comment:
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Re: Acer AL2416W Power supply problem
yes, the resistance of the probes together is 0.5 ohm. so i assume that the resistors' reading of abou 0.7/0.8 are right...
so, next thing to do is only posting the photos, right?...Leave a comment:
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Re: Acer AL2416W Power supply problem
i measured also the resistor on the left of glue (under 1234) and i read 0.7 ohmsLeave a comment:
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Re: Acer AL2416W Power supply problem
found the resistor, i read about 0.7/0.8 ohms. you think is failed?
i'll search a good camera to take the photos and upload them as soon as possible!Leave a comment:
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Re: Acer AL2416W Power supply problem
2) ok, removed k3568 and obtained the same "in circuit" values (117-117-0.8)
3) i also removed the bad fuse and read "T3.15AH250V P". it can be useful to replace it, right?
4) retested all BD1 pins after removing k3568. now i obtained the "out of range" result in all cases, including 1-4.
thanks also to budm and rtech now i'm waiting for further instructions (and, possibly, explanation on what happened to the board )...
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Re: Acer AL2416W Power supply problem
ok. so tomorrow i'll buy this solder tip. it can be useful for further cases
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Re: Acer AL2416W Power supply problem
ok. there is any particular method to desolder these kind of component with all that heatsink?Leave a comment:
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Re: Acer AL2416W Power supply problem
2) for the k3568:
1-2: 117 ohm
1-3: 117 ohm
2-3: 0.7 ohm
3) i think the fuse is definitely bad. with dmm set to 200 ohm the display returns "1 . " (if i'm not wrong this means infinite resistance, right?)
4) assuming 1 to the left and 4 to right (where the + sign is) the results are:
1-2: "1 . "
1-3: "1 . "
1-4: from 1 ohm to 0.8 ohm after some seconds
2-3: "1 . "
2-4: "1 . "
3-4: "1 . "Leave a comment:
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Acer AL2416W Power supply problem
Hi to all, I'm Emanuele, from Italy. first of all i want to say i found this forum absolutely amazing
I immediately explain my problem. I was reading in this forum some posts about the Acer AL2416w because i was trying to repair the mine and i was doing some measurements with my DMM on the power supply board to test if it was all ok.
...but because i'm a noob i made the stupid mistake of try to measure the voltage across the pins 2-3 of the K3568. The result was that my ups restarted so i thought that i broke some components.
Effectively the fuse...Last edited by lele.v; 09-18-2012, 04:41 PM. -
Re: New Members - please post your introductions here
hello to everyone! I am Emanuele, from italy. Found this amazing forum while i was trying to repair my acer al2416w. but now i made i mistake and i need more specific help!Leave a comment:
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