Greetings,
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I think the use hot air removal in this case, considering all the near by components, could be risky unless you happen to have the proper size hot air tool hood that fits the chip and contains the heat to the very small area. I would consider just nipping the leads off the chip body and then remove the remains of the leads, one at a time, using a fine tipped soldering iron and tweezers.
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As the chip package is of the leaded type with just a few leads as shown in the photo, and is known to be defective (thus of no value) you might consider the following approach using at minimum the following list of special tools and supplies:
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a) Magnification hood with LED headlight illumination that ensures a detailed view of the chip.
b) Miniature diagonal wire cutter plyers.
c) ?Teflon or similar tipped high temperature, low thermal conductivity tweezers.
d) Fine tipped, temperature controlled soldering iron.
e) Very fine solder.
f)? Isopropyl alcohol and Q tips?
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1) Remove the chip body by using the cutters to snip off all the leads close to the chip body.
2) Using the very fine tipped, temperature controlled soldering iron heat and remove the remaining leads with the tweezers one at a time.
3) Carefully remove the remaining old solder on the footprint pads with solder wick.
4) Using the Q tips clean the footprint area with isopropyl alcohol.
5) Examine the footprint carefully and ensure all the pads are isolated from each other.
6) Whilst ensuring the correct chip orientation solder in the new replacement chip by just wetting the pads using a minimal amount of solder
7) Inspect the install to ensure no adjacent pins have been accidentally bridged with solder.
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? ? ? I hope this info is found helpful and good luck!
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73
Tom
VA7TA
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