I've bought a couple of cheap dead GPUs from eBay to try to repair. I have an Atten 858D heat gun, a Brymen BM257 multimeter with a thermocouple and some cheap chinese flux paste (tested it for continuity and it's non-conductive). Just wanted to check if there's anything I should know before I attempt this. My plan is as follows:
- Cut an appropriately-sized square from a piece of aluminium foil to shield the rest of the PCB.
- Apply flux paste around the outside of the GPU chip.
- Set fan speed to low and gradually heat the GPU up to 220 celsius (using thermocouple to check temperature).
- Hold at 220 celsius for 15 seconds
- Allow to cool for 30 minutes.
If anything falls off I can resolder with my Hakko FX-888D.
Am I missing anything? I'm planning to set the temperature with the thermocouple on the chip rather than the 858D's slightly dodgy temperature setting (thermocouple said it was 250 degrees when it was 220 on the display).
Also, should I get a cheap IR thermometer instead of the thermocouple or will it do?
Thanks in advance