Exposing a Chip on Board (COB)

The video shows the process of removing the epoxy resin using a scalpel and a heat gun (fired up to 200°C). Removing it with a scalpel was rather destructing, but I did not want to use aggressive chemicals. The whole process took about 10 Minutes. The last minute of the video also shows some close-ups done with a cheap webcam, which was modified for magnification. More information can be found at www.kaibader.de...

[@crazyivan030983]

Thank You! I was always wondering but never searched for answer. Greetings from Poland :)

[@WELLINGTON20]

So it’s a pre programmed OBC and the black blob is put on to protect the chip from light and from the elements of the doping process.

[@zielony1212]

Nah, it's to mask it.

[@TheChrisey]

Should be able to use some type of solvant to dissolve the epoxy without breaking the wires

[@phantom2012]

Sulfuric acid, or glycolysis can work. It pretty much ruins fiberglass too so it's not perfect. Also laser engravers can sort of reverse 3d print them, but you kinda need to know exactly where the die is. I'm making a micro x-ray machine just for that reason.

[@TheChrisey]

@@phantom2012 I would think that the solder mask would protect the fiberglass long enough for it to dissolve the epoxy. Once you're looking to expose the chip you pretty much sacrifice the board too so I don't think it's that much of an issue. Maybe preheating the epoxy will allow a weaker solvant to take care of the epoxy without damaging anything else

[@CreeperSlenderman]

I have to fix a joystick and i broke a pad and so i have to solder it directly to here. lmao

[@glargoyle]

Is the chip itself destroyed by this process or is it possible to reconnect the wires with proper equippment?

[@rocky_adventure_bay7562]

Gar Goy yes, it looks like a small cpu

[@KaiBader_de]

At least the bonding wires are destroyed, and reattaching them is beyond my capabilities.

[@Gkokkinakis2]

@@KaiBader_de but is it possible ?

[@fasrart]

yes, you would of course need a machine to do this and very fine wire. refer to this video kzbin.info/www/bejne/o6e9YpeAqtuYpNk however you would also need to wire them correctly, which is another problem in itself, but if you had many of these chips you could just keep trying until it worked lmao.

[@yugopal]

I need to manufacture sound chips that contains sound of my choice. Can you help me. Need to make simple many sounds recorded in them. Like Chinese toys have

[@veronicastar2114]

Unintentional ASMR.

[@someonesomeone8447]

Ess chip me gana dalna ho to kaise dalenge .ye toys me bhi to hota hai.ek video banao nn

[@Recordable2000]

Is it safe to leave it without the blob? Will it still work or will it break. I have some bootleg famicom cartridges, so I want to fix them

[@309electronics5]

Depends... If you damage the bond wires by decapping, say rip to your cartridge, they cant be soldered on they are welded on so if that happens you cant fix it. Also semiconductors that are made of silicon are sensitive to bright light, because it generates voltage in them and that can mess up bits inside the die. Thats why solar panels use silicon and chips are packaged

[@aderitosantos1695]

Are gold inside, Amazing!!

[@masterkamen371]

Even if that was gold (it's most likely copper), there would be so little of it that you could maybe get a few cents worth.

[@rkm2238]

Awesome

[@yugopal]

I have subscribed your channel and liked the video as well. Please help me if you know making sound chips. Or one time recordable cons and procedure to record sounds/voice.

[@mastermindnaveen]

U sir is a legend!!!!

[@johndripper]

view it with microscope and post the pictures