7900GT "dead" ?!

[andL64]

the vgpu mod i did very easy and it worked for sure fine i just connected a wire (all other people used the conductive INK) to solder between the 2 spots i m sure you know what picture i mean, thats the 1,4V vgpu mod

and the other one with the vaiable resistor was the vmem like in the picture above.

just found U502 the ISL chip, i cant find the U501, where sould it be located?

[andL64]

think only voltage regulator is the ISL chip located U502

ISL 6568 ( last 8 could be a B bout i doubt)
CRZ
N601RJ

edit: lol, electronics dealer is unable to find the IRF7821PBF N channel mosfet... omfg i think i need an other dealer he knows as much as me bout electronics

[andL64]

LOL ok checked again exactly , sry was my fault heres the U501:

U501:

6549CBZ
P605BKB

[t024484]

LOL ok checked again exactly , sry was my fault heres the U501:

U501:

6549CBZ
P605BKB

It is the ISL6549 Bucket Regulator, using two N channel Mosfets.
Replace both Mosfets (Q501 and Q502) with the IRF7821PBF.

[andL64]

hey look here thats what i foudn on alldatasheet.com

http://www.datasheetcatalog.net/cgi-...&action=Search

its just IRF7821 or IRF7821TR
or
IRLR7821PBF and IRLU7821PBF

this is again a noobish question but as i said i dunno which is the right one sry
the exact one like you said IRF7821PBF i cant find on alldatasheet.com and my dealer also dont in catalog *ooops*

thanks a lot again youre xtreme :P

[t024484]

hey look here thats what i foudn on alldatasheet.com

http://www.datasheetcatalog.net/cgi-...&action=Search

its just IRF7821 or IRF7821TR
or
IRLR7821PBF and IRLU7821PBF

this is again a noobish question but as i said i dunno which is the right one sry
the exact one like you said IRF7821PBF i cant find on alldatasheet.com and my dealer also dont in catalog *ooops*

thanks a lot again youre xtreme :P

IRF7821 and IRF7821PBF are basically the same, but the latter is leadfree on its external pins according to new regulations.

See what you can get, it makes no difference.

[s e t h]

i checked the connections on the ones you need to replace.
on one side all legs are connected to the large silver plane and on the other side 3 legs are connected to ground.
the last leg goes somewhere else.
so soldering will be easier than it looks

[andL64]

i soldered many things but didnt solder 2 mosfets off the board and 2 on again well we will see how skilled i am *lol*

i will thank you all again a lot for this great help and knowledge but i think now its my turn!

i ll see if i can get the mosfet and try it out!

[t024484]

i soldered many things but didnt solder 2 mosfets off the board and 2 on again well we will see how skilled i am *lol*

i will thank you all again a lot for this great help and knowledge but i think now its my turn!

i ll see if i can get the mosfet and try it out!

Let me know if you are unable to get the Mosfets.
Succes

[andL64]

lol, i asked 2 big electronic companys here and my little dealer nobody has got them in stock, but they could get them i think....

its a shame that i m unable to get some little mosfet in vienna thats austria, well i see what i ccan do maybe i ll order 2 pieces?!

or did you got some t024484?

andL

[andL64]

found a shop here but only with this one:

IRLR7821

but it has not 8 legs...

[t024484]

found a shop here but only with this one:

IRLR7821

but it has not 8 legs...

You could use them to test if your board is still O.K.
But you have to be a little inventive since the gate is on the left side and your board expects the gate to be on the right side.
The single source pin is on the right side and is expected to be on the three left pins on your board.
But for a quick experiment they are very usable. If everything works as it should, you can always switch them for the IRF7821.

[andL64]

You could use them to test if your board is still O.K.
But you have to be a little inventive since the gate is on the left side and your board expects the gate to be on the right side.
The single source pin is on the right side and is expected to be on the three left pins on your board.
But for a quick experiment they are very usable. If everything works as it should, you can always switch them for the IRF7821.

ok i get flytek's description.... with the silver plane and the others grounded.

i cant understand your post,

well problem is i cant understand how the mosfet should be soldered on, which pin where, you know.

if i understand correct its like this?!

broken mosfet:
red ones are ground
blue one i dunno = silver plane
yellow one = dunno

do you mean the one side of the mosfet IRLR7821 with one broad pin (gate?) should be connected to the silver plate? (blue ones of the broken?)

but which of the other ones goes the the 3 red ones (on broken one)? the green or the red of the IRLR7821,

and whats about the yellow one on the broken mosfet and the blue short one on the IRLR?

the picture is just *lol* sry like my little brother drawed it

picture:

[t024484]

ok i get flytek's description.... with the silver plane and the others grounded.

i cant understand your post,

well problem is i cant understand how the mosfet should be soldered on, which pin where, you know.

if i understand correct its like this?!

broken mosfet:
red ones are ground
blue one i dunno = silver plane
yellow one = dunno

do you mean the one side of the mosfet IRLR7821 with one broad pin (gate?) should be connected to the silver plate? (blue ones of the broken?)

but which of the other ones goes the the 3 red ones (on broken one)? the green or the red of the IRLR7821,

and whats about the yellow one on the broken mosfet and the blue short one on the IRLR?

the picture is just *lol* sry like my little brother drawed it

The large metal backplate on the IRLR is the drain and should be connected to the metal surface where you have drawed 4 bue pins.
The source is the right pin of the IRLR and should be connected to the three red pins.
The gate is the left pin of the IRLR and shoud be connected to the single yellow pin in your drawing.

P.S. Don´t say sorry for your little brother, he did a good job.

[andL64]

hey thanks thats absolute clear

lol, i drawed it! not my brother so i said lol because it really looks funny just very quick drawed, so it looks like painted by a little kid

[s e t h]

so did you get the parts you needed?
i can't wait for you to get the card going again

[alpha0ne]

0502 is the same but 0501 is slightly different on my MSI NX7900GT, I cant check it as it was sold today (upgrading already/again ) but I will check with the buyer and post back with the exact details/fet seriel numbers

[alpha0ne]

Ok the 0501 chip on the MSI NX7900GT is slightly different

This one says :
32N03S
GAA604

and its a diff shape.

Are other cards the same ????