Unsoldering Dell latitude 5400 bios chip

[cbake886]

I have unsoldered bios chip in the past but the one on this Dell latitude 5400 will not come off. I have tried heating it from below, from the top with a heat gun and no luck. I messed up the chip and now I need to replace. I have replacements but I still cannot get it off. Any pointers?

Pics:

https://imgur.com/a/sYZnOXX

[mon2]

Re: Unsoldering Dell latitude 5400 bios chip

These are multilayer PCBs and with lots of ground plane. The ground plane acts like a heat sink. Respectively you will need a high temp hot air station. Ours claims to reach 550C (BEST 863 which we understand to be a clone of the Quick series). Even the original is not too crazy on pricing but we paid ~$200-$250 USD from Aliexpress. We have met with BEST TOOLS in HK at past electronic trade fairs. They are a solid vendor and manufacturer who has stated they will sell us spare parts if we ever need to service our unit. So far, 2 years later, still very pleased with this station.

We did face an Asus motherboard that was like your case - the IC would not budge. While the client opted to replace the entire logic board, @SMDFlea and others suggested that we were missing the underside heater. Since then, we have sourced a Hakko heater to help the heat to travel from under the PCB. There are some nice IR tables for cheap on Aliexpress that may be worth a review for these type of boards.

The combination of the hot air from the TOP while the heater from the bottom side (IR or other) will do the trick. Finally, you must, repeat must apply flux onto the part that is being removed / reflowed or soldered. Flux just makes life easier. Amtech is the name being thrown around but TBH, we have yet to see the 'real Amtech flux'. Ours is from Aliexpress but it works fine. You are in MI (our neighbor across the pond - miss my La Shish & Mexican Town food) - you should be able to source from Louis. The pricing we saw on Amazon for the same is just silly high for flux.