2 different LCD problems, 2 repair attempts, 2 times the disappointment @HeyBirt

Hey Birt! | 2 different LCD problems, 2 repair attempts, 2 times the disappointment @HeyBirt | Uploaded November 2023 | Updated October 2024, 2 hours ago.
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In this video we take a look at a pair of Casio FX-841P pocket computers sent in from England for repair. They both have LCD troubles, but each is a unique problem. We’ll do our best to get this pair of pokecoms purring perfectly. But sometimes fate has other plans.

Timeline:
00:00 – Welcome
01:31 – Unit #2, missing rows on LCD
09:50 – LCD reseal attempt
13:57 – Testing and bodging
18:18 – Unit #1, dim LCD
21:51 – Testing and sadness
25:34 – Replacing mystery cap, test #2
27:37 – Wrap up
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Credits
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$The truth about Retr0brite – busting myths with science… Video sponsor: PCBWay: $5 for 2-layer PCBs with 24hr turnaround at https://www.pcbway.com/ Chucks video: https://www.youtube.com/watch?v=pFFDSHDtVNg One of the situations we are often faced with when restoring an old computer is a yellowed plastic case. You have probably heard of Retr0Brite, few things in the retro community have caused as much controversy, rampant speculation and unfounded opinions as this subject. While there has been a lot of speculation and theories passionately bandied about on this subject there has not been an effort to understand the process. A combination of research and practical experimentation was done to try and answer the questions: What it is Retr0Brite doing and what is it doing, or not doing, to the plastic. We will discover where color comes from, what plastic is, what makes plastic yellow, and what Retr0Brite is actually doing. This video is the result of an effort to get to the bottom of the matter using a scientific approach. I ask that you please keep an open mind and watch through to the end of the video before banging out a comment on your keyboard. Timeline: 00:00 - Welcome 02:07 – Background and research 03:27 – Where does color come from? 04:56 – What is plastic? 05:58 – The experimental setup 07:16 – What makes plastic yellow? 10:15 – The great bromine brouhaha 11:27 – How does Retr0Brite work then? 13:22 – Time for some experiments 15:15 – Sodium Percarbonate 16:21 – Summery of experiments 19:17 – How does bleach work 20:23 – How Hydrogen Peroxide works as bleach 21:16 – The electrolysis experiment 22:43 – Results of electrolysis experiments 24:44 – Conclusion 25:49 – What about SunBrite? 27:44 – Possible problems and busting myths 34:28 – My preferences 35:88 – Conclusion, further work 38:17 – Wrap up Please consider clicking on the Subscribe button below and then click the bell icon. That way you will be notified when I post a new video. Thanks! Help support Hey Birt! https://www.heybirt.com - merch https://www.paypal.me/HeyBirt https://www.patreon.com/heybirt https://www.subscribestar.com/hey-birt Hey Birt! On Social Media! Facebook: Soigeneris: https://www.facebook.com/Soigeneris-295527583797729/ Hey Birt!: https://www.facebook.com/HeyBirt/ Twitter: Hey Birt!: https://twitter.com/HeyBirt?lang=en Links Perifractic’s Video: https://www.youtube.com/watch?v=8P1OVj0IcqY Chucks Channel: https://www.youtube.com/user/CAHUTCH1000 Joes Channel: https://www.youtube.com/user/umbravector Heat mats: https://amzn.to/3MXgSVG Papers, images, data: https://1drv.ms/u/s!AtH4vpaZnzX7lLsYdZN-tiTP8jwiig?e=LXxq36 Amazon Associated Links Tools: Fiberglass pen: https://amzn.to/3pWRzIk Fiberglass pen refills: https://amzn.to/3RgqGdQ OWDEN Hollow punch set: https://amzn.to/3PXzTXW Battery Spot Welder: https://amzn.to/3QMaG3T Hotplate: https://amzn.to/3rxOtLU Spudger set I use: https://amzn.to/3z19pM7 Heat mats: https://amzn.to/3MXgSVG Amazon Associated Links Chemicals: 303 Aerospace Protectant: https://amzn.to/3BxRa5Y CiaKot: https://amzn.to/3CvVKiY Overcaot Pen: https://amzn.to/3s439Bt Novus Plastic Polish: https://amzn.to/2VwtFaV Electronics / PCB cleaner: https://amzn.to/3ORx62D Citric Acid: https://amzn.to/3krkgdt Amazon Associated Links Parts / Supplies: Foam sheet, 1mm: https://amzn.to/37CfTtt Uxcell shrink wrap: https://amzn.to/3boKJEd NiMh tabbed Sun-C: https://amzn.to/3nHCbxL NiMh tabbed AA: https://amzn.to/3OMjBkW uxCell strain reliefs: https://amzn.to/3nJ5AaP 3M Double sided tape: https://amzn.to/3p9odcG Noctua 80mm NF-A8 FLX fan: https://amzn.to/3ASVhsJ Credits Chiptune Thing No. 3 Victory by Steven O’Brien https://soundcloud.com/stevenobrien Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music provided by Music for Creators https://youtu.be/ujIMRIJ1JG8 Polymer pic: Yurko, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons ABS plastic monomers: By Jü - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=78113089 By Joos de Momper the Younger - [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=6582707$

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