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  #1 (permalink)  
Old 10th February, 2003, 10:23 PM
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chip next to vdd-modded chip (fried!!!!)?

can anybody tell me why the chip next to the one which is volt modded caught fire.

was running vdd mod so why not that chip instead?.the chip in question is the one which looks the same as the one which takes the vdd mod (U28) .

any suggestions or poss remedies for next board anybody?
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Old 11th February, 2003, 01:58 AM
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Did you solder or use a smd grabber ? Now the $102.00 question , (a.)did you place the resistance between the two legs of the modded chip OR (b.)did you apply one side of the resistance to the modded chip and ground it elsewhere (so the current has to travel around to get back to the modded chip) ? If (a.) I will worry a little.
(b.) I will breathe easier.
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Old 11th February, 2003, 08:40 AM
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timbob , I soldered the joint .it had been fine for two weeks,running 1.82vdd.soldered outer two legs.
it could be totally unrelated but if it aint ,then I want to know if I should have perhaps passive cooled both modded chip and one next to it.
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Old 11th February, 2003, 01:22 PM
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Re: chip next to vdd-modded chip (fried!!!!)?

Quote:
Originally posted by doctoromeo
can anybody tell me why the chip next to the one which is volt modded caught fire.

was running vdd mod so why not that chip instead?.the chip in question is the one which looks the same as the one which takes the vdd mod (U28)
Without having a board to look at, I believe you'll find that the chip that died was the MOSFET package that does the grunt work of the Vreg.

The voltage regulator chip doesn't directly control the voltage output. Instead it does all the processing, and controls the MOSFETs. The MOSFETs are the part that sit inline with the power, in just the same way as the CPU voltage regulator works.

Anyone else able to confirm this suspicion?

Áedán
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Old 11th February, 2003, 01:38 PM
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Re: chip next to vdd-modded chip (fried!!!!)?

Quote:
Originally posted by doctoromeo
can anybody tell me why the chip next to the one which is volt modded caught fire.

was running vdd mod so why not that chip instead?.the chip in question is the one which looks the same as the one which takes the vdd mod (U28) .

any suggestions or poss remedies for next board anybody?
Without wanting to sound too blunt - because you Vdd - modded your board.
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Old 11th February, 2003, 02:47 PM
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blunt is good .went in eyes wide open, knew the score.
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Old 11th February, 2003, 02:54 PM
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Aeden, chip in question has 8 legs same as vmod chip.and i,ve just checked the one on my 8rda+ and that hasnt been modded (yet) and it is hot already so I will put on tall h/s on that chip after mod( be a little awkward before) and hope for the best.
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Old 11th February, 2003, 06:03 PM
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Quote:
Originally posted by doctoromeo
Aeden, chip in question has 8 legs same as vmod chip.and i,ve just checked the one on my 8rda+ and that hasnt been modded (yet) and it is hot already so I will put on tall h/s on that chip after mod( be a little awkward before) and hope for the best.
Post the part numbers on top of the chip! Generally MOSFETs are fairly resistant to thermal runaway, so don't tend to explode in a shower of magic smoke unless something went horribly wrong.

Áedán
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Old 11th February, 2003, 06:25 PM
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Think i know what chip doctoromeo is talking about. Its one just to the left from modded chip (looking into tower case). It looks exactly like the chip what you mod for VDD. Am i right doctoromeo ?

My is hot too (i didn't mod VDD) think its the hotest one on my motherboard, i hope it will not fry like yours doctoromeo
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Old 11th February, 2003, 06:40 PM
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yep frostmoon,thats the one and yes its already the hottest chip non cooled on the board. mosfets were ok.
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Old 11th February, 2003, 07:23 PM
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I put a small heatsink on mine..... you will have to be careful as it is right inline with the AGP port, and if you have a long card ( AKA Geforce) it will have to be pretty short to allow clearance.
Mine was rather warm b4 the vdd mod, and I can feel that the HS is warm to the touch as we speak.... must be careful putting AS epoxy on it, as it is a small area to work with.
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Old 11th February, 2003, 07:43 PM
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Aeden it is some kind of controller... It Looks like the # on it is

228M - not 100% sure thats what it is, but it looks like thats the #

And I believe it is made by International Rectifier by the symbol
IOR ( that is not really an "O" it is a symbol of a diode in a colored circle - but it matches the look on their webpage).

I went to their page, but couldn't match it up against anything they had.... the chip you actually mod has the same symbol, and it IS listed on their page ( 3037A)
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Old 11th February, 2003, 08:26 PM
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TBH, I'd expect it to be in the form of something like IRF7301.

You see, the controller used for the Vdimm voltage (IRDC3037A) has no power handling capability itself. If you ask the IRDC3037A to provide more than a few tens of mA, it'd go pop.

Hence, there needs to be a pair of MOSFETs somewhere close. IR do a whole series of dual MOSFETs in nice neat little packages. They generally start IRF7xxx.

Áedán
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Old 11th February, 2003, 10:28 PM
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Is it the one below the modded chip in this picture ?
http://members.cox.net/8rda/images/vddmod2.jpg

bob
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Old 11th February, 2003, 10:40 PM
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yes timbob2469, this is the one we're talking about.
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Old 11th February, 2003, 10:47 PM
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Quote:
Originally posted by timbob2469
Is it the one below the modded chip in this picture ?
http://members.cox.net/8rda/images/vddmod2.jpg

bob
yep,thats the one.

just vdd modded 8rda+ @ 1.78v
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Old 11th February, 2003, 10:53 PM
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aeden chip start 246m
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Old 12th February, 2003, 08:14 AM
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Quote:
Originally posted by doctoromeo
aeden chip start 246m
Yeah - thats a 3rd pqarty equivalent of what Aeden is describing
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Old 12th February, 2003, 03:33 PM
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Quote:
Originally posted by timbob2469
Did you solder or use a smd grabber ? Now the $102.00 question , (a.)did you place the resistance between the two legs of the modded chip OR (b.)did you apply one side of the resistance to the modded chip and ground it elsewhere (so the current has to travel around to get back to the modded chip) ? If (a.) I will worry a little.
(b.) I will breathe easier.
bob
Okay I want to do vdd mod with my 8rda+ and the tutorials say to place a resistor between the two legs but now you say to ground it. I'm a bit confused now what should I do now between the two legs or between one leg and ground ?

Greetz Jeff
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Old 12th February, 2003, 04:40 PM
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I don't know if anyone has check the temp of the chip next to the one that you do the vdd mod to but mine with 1.58vdd get 67c with no air moving in that area. With 60mm fan blowing in area 44c so it might be wise to cool this area good if you are doing the vdd mod. This little chip gets quite warm.
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