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semi-invasive [2019/12/07 22:14] – W mcmastersemi-invasive [2019/12/08 19:23] (current) mcmaster
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 EPROM/EEPROM/flash can be erased by shining UV light or x-rays into the surrounding oxide. This slightly oxidizes it, letting the floating gate to drain out. EPROM/EEPROM/flash can be erased by shining UV light or x-rays into the surrounding oxide. This slightly oxidizes it, letting the floating gate to drain out.
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-===== Nail polish ===== 
  
 Usually a masking compound is applied to selectively block UV to the firmware, with red nail polish being the most popular or at least traditional. Usually a masking compound is applied to selectively block UV to the firmware, with red nail polish being the most popular or at least traditional.
  
-McMaster +{{:mcmaster:nail_polish:overview.jpg?400|}} 
-  - [[Revlon ColorStay Gel Envy Longwear Nail EnamelQueen of Hearts|https://www.amazon.com/gp/product/B00LT8S30G/]] + 
-  Bought at local store a while back and it seems to work well enough +McMaster misc notes 
-  Bulk removal with acetone, but leaves some residue around edges + 
-  Remaining residue softened with aceotne +Application 
-  Remove using single hair brush if possible +  * Use a single hair brush 
-  Can be more aggressive with PP monofilament wire +    * Ex: cut down MG 855-5 horse hair brush 
-  Cold H2SO4 also works well. Wash with IPA then acetone +  * Place chip in bowl 
-    Washing with water may really heat up the mixture+  * Shallow fill bowl with acetone 
 +    * Creates shield gas to prevent nail polish drying out in small quantities 
 +    * Place paper towel on side to elevate gas enough to keep nail polish liquid 
 +  * If nail polish is too viscousslightly set top of chip with IPA 
 +  * Apply a glob of nail polish, then use the spring force of the liquid to precisely move it around 
 +    * By gently agitating the liquid boundaries its possible to very precisely move it forward 
 +  * Place the nail polish in the bowl in some sort of holder 
 +    * Ex: above image has a 1/4-20 SHCS with a nut screwed on as a base 
 + 
 +Nail polish 
 +  * [[https://www.amazon.com/gp/product/B00LT8S30G/|Revlon ColorStay Gel Envy Longwear Nail Enamel, Queen of Hearts]] 
 +  * Also can be used to look fabulous! 
 +  * Bought at local store a while back and it seems to work well enough 
 +  * Other colors probably fine, but red is easy to see 
 + 
 +{{:mcmaster:nail_polish:pipette.jpg?400|}} 
 + 
 +Above: fine polypropylene tip for more aggressive cleaning. The tool is strong enough to damage bond wires though, so use sparingly 
 + 
 +Nail polish removal 
 +  * Bulk removal with acetone, but leaves some residue around edges 
 +  Remaining residue softened with acetone 
 +  Remove using single hair brush if possible 
 +  Can be more aggressive with PP monofilament wire 
 +  Cold H2SO4 also works well. Wash with IPA then acetone 
 +    Washing with water may really heat up the mixture
  
  
 
semi-invasive.txt · Last modified: 2019/12/08 19:23 by mcmaster
 
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