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Dell Latitude D620 Graphics Chip
Hi there.
I refurbish dell laptops and have just started to troubleshoot down to chip level. I have a few latitude D620's where the Nvidia chip needs changing but I cant find where to purchase them from. i'm not exactly sure what the actual chip is as the writing is too small to read but after some time on google I think it is a 256MB NVIDIA Quadro NVS 110M.
Can anyone confirm what the actual chip is (or options) and where such components can be sourced from ?
Regards,
Bob
ejn63
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November 20th, 2011 03:00
The chip is not replaceable - it is soldered to the system board. If the chip has failed, the system board needs to be replaced. If you want to go through with repair, skip the nVidia board and install the Intel version, which is much more reliable.
You'll need a new heatsink assembly to switch from nVidia to Intel.
www.parts-people.com/index.php
The Surfer
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November 20th, 2011 13:00
The only solution is to change the motherboard. Overheat of nvidia chip is the cause
speedstep
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November 20th, 2011 17:00
The chips are not bad they need solder reflow aka need to be re-soldered to the motherboard.
dellrefurb
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November 21st, 2011 00:00
thanks for the comments. I have three D620 with video chip problems, all three giving slightly different symptoms. I gave two of them a blast with my hot air gun on full temperature and full blow speed for about two minutes and they both worked fine after this !!!! maybe a dry joint somewhere but I still dont trust them though....ill do the same to the third one today and see what happens....
If i do attampt to change these out in future i think i need an infra red soldering station rather then my hot air gun......
speedstep
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November 21st, 2011 07:00
The ROHS is why there are issues. Removing the chip and using tin lead solder fixes the issue.
The Nvidia chips used to use a type of bump called high lead. The failing type is called eutectic.
ROHS Bans Lead Solder and thats where the issue comes in. Apple also has this problem as did microsoft
on their XBOX 360 etc. Its not just confined to NVIDIA chips. The Ibook Dual USB with ATI Graphics chip has the
same issue.
High-lead bumps have a much higher current capacity than eutectic bumps.
When electricity is run through eutectic bumps, you also get an effect called electro-migration.
This means that some of the materials are essentially pushed around by the current, and you get voids in the bump making it look like swiss cheese. These voids lessen the capacity of the bump, and eventually they crack.