Michael Hayes wrote, On 11/30/2012 11:45 AM:
On Fri, 2012-11-23 at 17:08 +1300, C. Falconer wrote:
Yeah its on the laptop's motherboard - I'd be worried about disturbing
everything else on the board.
It's best to use a pre-heater to heat the PCB and then to use a hot air
pencil on the chip. Some of my students have pre-heated boards in a
frying pan. We've got a BGA rework station on order but have a
pre-heater and hot air pencil that you can use.
Thanks to all those who made suggestions - I ended up preheating the
board using low speed, then heating the GPU to ~200 degrees using a
cheap garage "hairdryer" and using an IR temp sensor to know when to
back off . I held the temperature there for five minutes by the
clock, then let it air-cool down.
The motherboard was bare and I wrapped the whole thing in tinfoil other
than a small window on the affected IC itself.
While it was air cooling I cleaned the fan, chipped off all the CPU
sealant slag, and trimmed some aluminium off the case to improve air intake.
Reassembly was straightforward and I used arctic alumina as the snot.
Was interesting to find blue foam about 5mm thick between the
northbridge and the heatpipe.... not expecting something like that to
transport a lot of heat.
The laptop works perfectly again now, and the lower temps should help it
last another few years.
And I now own some more tools.
--
Craig Falconer
_______________________________________________
Linux-users mailing list
[email protected]
http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
