Reflowing the motherboard - how to remove protective shield
Having last week celebrated my first notable success with my recently acquired temperature controlled air gun (reflowing the video chip on an old Dell XPS1530 laptop) I decided it was high time I turned my attention to a Samsung Galaxy Tab A SM-T580, that I’ve had knocking around for a couple of years or more.
It charges and speaks to me when I turn it on, but the screen remains black - apart from a just-discenable flicker from the backlight as it powers up the screen). I tried a new screen not long after I acquired it but it made no difference, so I decided something needed reflowing - probably the video controller if it’s a separate chip, or maybe the main processor if it has an integrated video controller.
The main chips are under a T-shaped shield, so I set my heat gun on 350C and applied it to the shield. I played it generally on the shield, and also on the edges, whilst trying to lift it with a pointed end of a pair of tweezers under a corner, but it didn’t seem to want to budge. I carried on for as long as I dared, and in fact when it cooled down it looked like the locking bar on the touch screen connector had started to melt - fortunately it still seemed to lock.
So what’s the secret in removing these screens?