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AMD Geode/Video 3/Script
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== Ethernet removal == Narrator: "Okay, so what about the Ethernet chip?" A glossy light green slide shows the text "What about Ethernet?" Narrator: "I left a mess and broke a ton of pins" The microscope photo of the chip's pins are shown. Various pins are bent and disconnected from traces, some of which are gone entirely. Narrator: "I managed to find a pinout of the chip" A screenshot of a datasheet showing a visual pinout for the RTL8139DL LQFP chip is shown. Narrator: "I overlaid the microscope photo on it" The microscope photo from before is overlaid, matching physical pins to the visual pinout. Narrator: "Using this I identified the broken traces" All pins but the broken ones are hidden. This leaves: * GND * AD21 * AD20 * AD17 * IRDYB * TRDYB Narrator: "So I have six broken traces" The microscope photo is shown with each of the six pins from before highlighted by name. The title text "6 broken traces" is shown. Narrator: "One trace is just ground" The text "1 trace is GND" is shown under the title. Narrator: "Five traces are data" The text "5 traces are data" is added to the previous text. Narrator: "These are all required!" The text "These are all needed for the chip to work!" is added to the previous text. Narrator: "How will I fix this?" A glossy light blue slide shows the text "How to fix?" Narrator: "I could run wires to the pins" The microscope shot before shows the broken pins with the large text "Add wires?" above. Narrator: "Here are the traces before I ruined them" A microscope shot showing pins covered in flux and solder but with intact traces is shown. The text "Here are the traces before damage" is shown. Narrator: "I overlaid the images which showed where some traces go" A composite microscope shot is shown, with the broken traces intact. The text "Overlaying shows where some god" is shown. Narrator: "But some traces disappear under the chip" Pins GND, AD21, AD20 and IRDYB are circled, showing there's no visible traces from the pads. The text "Where do these traces go?" is shown. Narrator: "I had to remove the chip to fix these traces" A glossy gray slide shows the text "I had to remove the Ethernet chip" Narrator: "So I blasted the chip with flux and hot air" The Ethernet chip covered in bubbling flux is shown, heated by a hot air gun. Narrator: "It didn't lift after 40 minutes" Tweezers are shown trying to gently pry up a chip from its corner while the hot air gun heats it. Narrator: "I gave up and cleaned up my failure" Isopropyl alcohol is sprayed over the chip, now cold and no longer being worked on. The pins of the chip are then shown with no minimal flux residue on them. Narrator: "I decided to practice on a test board instead." A glossy gray slide shows the text "Desoldering failed. So I tried on a test board" A much larger STM32 is shown with many many more pins. It has flux on its edges and a hot air gun is heating it. Narrator: "Within minutes I cleanly removed a giant chip" The microscope shows the intact pins of the test board. They are bridged but the chip was successfully removed. Narrator: "So I tried desoldering the Ethernet chip again" A glossy gray slide shows the text "Success! Time to try again" The Ethernet chip is shown again, this time having flux applied to its pins with a toothpick. Narrator: "This time it worked!" The already removed chip is lifted from the board. Underneath a massive amount of dried flux is visible. Narrator: "Underneath the chip was my first attempt's dried flux" The microscope pans around the pins of the chip showing yellowed traces and dried flux. Narrator: "I did slightly melt the clock battery connector" The CR2032 clock battery holder is shown, with the side of it near the chip disformed but still usable. Narrator: "I did a thorough cleanup of the board" A cotton swab wipes gunk off the board. Narrator: "I also cleaned the chip itself" The Ethernet chip is shown soaking in isopropyl alcohol. Narrator: "After all this work I could finally see the traces" A microscope image of the the damaged traces are shown, with the traces underneath the chip now visible. The traces that were disconnected do not lead underneath the chip. Narrator: "Wait, they go nowhere?" The traces that are disconnected a circled. The text "The traces go nowhere?!" is shown. Narrator: "I'm confused. What's happening here?" A glossy gray slide shows the text "What is going on?" Narrator: "This circle on the chip and silkscreen shape indicates pin 1" A microscope shot of the damaged pins is shown. It has a circle around the leftmost corner of the chip. The chip has a circle on it and the PCB has a marking on that corner. The text "This circle and PCB marking indicates pin 1" is shown. Narrator: "No! This smaller circle and larger marking does!" A microscope shot from another side of the chip is shown. It has a smaller circle at the corner but a much larger triangle marking on the PCB. Narrator: "I should have looked at the top pins in the datasheet" A screenshot of the Ethernet chip datasheet is shown. This time the top pins of the chip are shown. The text "I should have looked at the top pins in the datasheet" is shown. Narrator: "These six pins to be specific" All pins are hidden except for the following: * CLKRUNB * REQB2 * GNTB2 * AVDD * RTT3 * LWAKE Narrator: "Here's my diagram from before but fixed" The microscope photo is shown with each of the six pins from before highlighted by name. The title text "REAL broken traces" is shown. Narrator: "Four traces are not connected" The text "4 are not connected" is shown under the title. Narrator: "AVDD is for analog power" The text "AVDD is for analog power" is shown under the previous text. Narrator: "LWAKE is for Wake-On-LAN" The text "LWAKE is for Wake-On-LAN" is shown under the previous text. Narrator: "So here's my plan for repair" A microscope shot of the broken traces are shown again. The text "Ethernet repair plan" is shown at the top of the image. Narrator: "First, add new pads for AVDD and LWAKE" Orange rectangles are added in place of new pads on top of the microscope shot. The text "First, add new pads" is shown. Narrator: "Second, cover exposed traces with solder mask" Parts of the board with exposed copper are colored green. This includes where empty pads are, and on top of new traces to hold them on the board. The text "Second, cover in solder mask" is shown. Narrator: "Third, re-solder the chip" Rectangles representing the chip and each of its pins are added, hiding most of the work done on the board. The text "Third, re-solder the chip" is shown. Narrator: "I'll do that next video" A black screen is shown with just the text "I'll do that next video"
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