Question GPU not working, reflowing expert advice needed XXX

jay-z-s

Honorable
Jan 28, 2013
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10,510
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Hi guys, since I'm a raging gamer (Hate to lose) I've hit my alienware m14xr1 laptop many times so hard that gpu started to render strange shapes and colours in game (thus i uninstalled drivers and now can't reinstall them,gets stuck in setup) so it's a hardware issue, I am still hoping(and yet praying) that it's a misconnection in solders of chip, so I bought a heat gun and willing to reflow it using hot air.
I tested on some old graphics card I had in home and I noticed how tricky this job is I'm wondering if you have any similar experience to share with me before proceeding (temperature, time, gun distance, nozzle size, flux type, movement, ...)
, I should mention that gpu is glued at 4corners to mainboard so I'm just planning for a reflow now
thx
 

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