Plan CI bought an Acorn A3000 that was being sold 'for parts only' due to some pretty serious battery damage. I had to try and save it!
Video shows complete teardown to board, removal of all components in affected area, neutralizing of corrosion, stripping back the solder mask from damaged traces and how I repaired traces and vias with a mixture of solder and magnet wire. I then reassemble and do a preliminary test boot.
Also shows a way to jerryrig a 'Del' key to save the keyboard ribbon when testing the machine and testing of 74 logic chips on an eprom programmer.
I probably went a bit over-the top but better to be sure. Many traces were rusty or had high resistance.
Acorn A3000 Battery Damage - Complete Board Strip & Trace RepairPlan C2019-04-18 | I bought an Acorn A3000 that was being sold 'for parts only' due to some pretty serious battery damage. I had to try and save it!
Video shows complete teardown to board, removal of all components in affected area, neutralizing of corrosion, stripping back the solder mask from damaged traces and how I repaired traces and vias with a mixture of solder and magnet wire. I then reassemble and do a preliminary test boot.
Also shows a way to jerryrig a 'Del' key to save the keyboard ribbon when testing the machine and testing of 74 logic chips on an eprom programmer.
I probably went a bit over-the top but better to be sure. Many traces were rusty or had high resistance.
Good luck AllDangerous Fake UK Mains CablesPlan C2024-09-19 | Dangerous Fake UK Mains Cables. Worth checking. Thanks for watching. Good luck all.This Fixed Stick Drift When Even Replacing Gimbals Twice Didnt. Very Cheap and Easy.Plan C2024-09-12 | Very cheap and easy fix to rectify stick drift on a controller or gamepad using only a couple of resistors. Worked when replacing the gimbals did not. Compensates for tuning at factory for original sticks.
Cheaper than new gimbal. Minimal disassembly, fairly basic tools (soldering iron, solder, a few resistors)
Worth a shot if all else fails. Should also work on drone controllers etc. will not work for Hall Effect (magnetic) based sticks.
Video covers basic idea, testing different values and gives some rough suggested started test values. The calculation for resistors in parallel is complicated but they are just my findings through experimenting.
WARNING! I SAY THE WORD 'POT' A LOT IN THIS VIDEO LOL
Good Luck AllPS5 No power Fix. (Wifi). Very short version.Plan C2024-08-25 | 3 minute version. Basically, a missing resistor and a cooked wifi module. Full repair vid is here for those interested: youtu.be/vGfPqOQQwuY?si=v-MXT__vaAEarKys
Music is digital math / hop up Cut and paste below:
Free to use on YouTube: You can use THIS track in your own videos as long as you add the following info in the description: - Music provided by AirwaveMusicTV ( / airwavemusictv ) - A link to this upload of the track on my channel - Social media links
Donate via PayPal and support my channel: https://www.paypal.com/cgi-bin/webscr...
Business inquiries & submissions: AirwaveMusicTV@gmail.comPlaystation 5 No Power. Diagnosis and Fix (EDM-020)Plan C2024-08-16 | This PS5 Would not turn on at all. In this video I take the board out, show the tests I did to work out the problem and fix it. These include:
0:00 - Intro 0:55 - PSU test 1:15 - Inspection for damage & previous work. 3:16 - Testing fuses 4:37 - Testing for shorts 9:54 - Re-balling replacement wifi module 12:09 - Removal of damaged wifi module and antenna connector 16:51 - Fit replacement module 18:10 - Replacing antenna connector 19:50 - Replace liquid metal 21:05 - Initial testing 23:30 - Summary reassembly & tests
Thanks to The Cod3r for his excellent video series. My videos are pretty 'bare metal'. A few handheld shots and not much post processing. I just try to document the repair in the hope it may be helpful.
Good luck all.Hombrew Sinclair QL Power SupplyPlan C2024-05-05 | In this video, I build a power supply for a sinclair QL by following an old schematic I found on the internet.
I talk through how the various power rails are created by the power supply and in the computer itself.
I put the power supply through several tests and eventually hook it up to a real Sinclair QL.
The finished product is pretty raw. I built it out of curiosity in order to try and learn something. I am not an electrical engineer, just a hobbyist with an interest. The video is for entertainment only. I am explaining it to myself as much as other people.
Good Luck AllAcorn A3010 Motherboard RepairPlan C2024-04-14 | Repair of Acorn A3010 motherboard that appeared dead and had suffered corrosion damage due to a leaking onboard battery.
Video shows summary of clean up of damage caused by battery acid, basic initial tests, cursory overview of trace repairs to battery damaged areas. I scope for clocks and reset, check the address bus and trace out broken connections. Finally, a brief power up and test. Also demonstrate a useful diagnostic tool for vintage Acorn computers.
Hopefully, there will be a part 2 detailing the rest of the restoration if I manage to obtain a case and etc.
Acorn POST Error Codes explanation/calculator: (Usually flashes of the floppy drive light) retro-kit.co.uk/page.cfm/content/Common-faults-on-the-Acorn-Archimedes22 November 2023Plan C2023-11-22 | Use a AA battery to help secure Velux WindowsAtari 2600 from Oven to Heatsink (Light Sixer)Plan C2022-11-05 | While refurbishing a couple of Atari 2600s, I experiment with a cheap and simple way to convert the RF can (which contains the mainboard and 3 custom chips) into a heatsink. The seed for this idea came when watching a video by @GadgetUK164 where he said it would be a good idea to mount a fan in or on the RF can (link below).
Normally, the three custom chips slowly 'cook' inside the RF can as they get hot and there is very little airflow. It is literally like an oven!
Over the years, the heat from the 3 chips had left heat/burn marks on the roof of the RF can!
The 3 custom chips (RIOT, TIA and 6507) are no longer manufactured and date from the very early 1980s or even late 1970s. The chips in these units were dated early 1981. Chips generally last longer if kept cool.
Replacements are available from retailers like Best Electronics in California but once they run out, that is it.
Hopefully, this modification will help to keep these custom chips (and therefore the 2600) going for as long as possible.
youtu.be/qxfbHP4LmQw @13:42Trying to Run My Combi Boiler off a 200W Power BankPlan C2022-10-23 | With all the talk about rolling blackouts this winter, I tried powering my combination boiler off of a powerbank which has an inverter.
Even if you have gas, without electricity the boiler will not work as the pump, ignition etc all need power. I did a few brief experiments to see if it would work and tried to work out how much time it would give heating and / or hot water for in a blackout.
On watching the footage back, the startup did briefly push the power drawe to 400W which is well ahead of the powerbanks rated output but it then settled back to well within limits. It started fine multiple times.
Obviously, a generator would work too but these have limitations such as noise, being outside, not being able to use in the rain etc.
These units can be had for as as little as £100 with vouchers etc.
Please note this is just an idea and your mileage may vary massively depending on what boiler and powerbank you use and how you set the thermostat.
I AM NOT SUGGESTING ANYBODY DO THIS. I AM NOT A BOILER ENGINEER!
Other units: amazon.co.uk/powkey-200Watt-Portable-Generator-42000mAh/dp/B08CN8TLH3HP Pavilion Slimline, Black Screen no P.O.S.T. Power Supply FixPlan C2022-06-12 | A neighbour's old desktop PC showed strange behaviour. More often than not, it would not start and just show a black screen. It would not POST.
I fixed it by changing a capacitor in the proprietary power supply. Not the most exciting repair but I thought I would document the process.
The PC is an old Pentium Dual Core HP Pavilion Slimline desktop S3714UK but the principle would hold true for newer machines as well.
Good Luck AllAnother Acorn Archimedes A3000 Repair VlogPlan C2022-06-03 | A pretty detailed video log of an Acorn A3000 repair. The machine was purchased from Ebay and was apparently recovered from a skip years previously. It was in very good cosmetic condition but had several faults and would not even POST or boot initally.
The video covers the fault finding process, using the the service manual, schematics and an oscilloscope to get the machine to boot.
After that, the floppy drive, power supply, keyboard and mouse controls are serviced and/or repaired.
Key points: Intro: Initial cleanup and board repairs: 02:33 Fault finding steps per the Service Manual: 06:10 Floppy drive: 18:51 Keyboard: 20:53 PCB trace repairs: 25:24 Power supply tests: 27:44 Mouse trace repairs: 31:07 Keyboard ribbon repairs: 32:02 To do: 33:51
Good Luck AllMaking & Testing a NeatPLA for the Commodore 64Plan C2022-04-16 | 'NeatPLA' is an evolution of 'DodgyPLA'. Both are CPLD-based replacements which I have found to show good compatibility.
In this video, I build and test a 'NeatPLA'. Two simple tests are used - 1) Super Zaxxon and 2) a dedicated glitch test circuit designed by Eslapion. The test rig is a 250407 motherboard revision.
Music is "Inspiartion" (Filmora 11 Copyright Free)
Good Luck All.Bonus Turtle Feel Good Footage!Plan C2022-03-30 | Why not? We have all had a shit couple of years.
Good luck AllAcorn A3000 Extreme Refurb : Acid Damaged Acorn and a Magic POSTBoxPlan C2021-09-19 | This video documents the repair of an Acorn Archimedes A3000 which had suffered extreme battery damage. It was pretty much a complete strip and rebuild of the motherboard. The unit is then tested and brought back to full working order. A diagnostic tool called a POSTBox, which helped greatly with the repair, is also showcased.
The unit was very kindly donated to the channel by GadgetUK164 and featured in his recent video: "Acorn Archimedes A300 Repair (From Hell)" youtu.be/iGhJbeUrA0Y
A massive thank you to GadgetUK for both the donation and all the help as well as to Zarchos, who donated some machines to GadgetUK in the first place. I am blown away by the generosity.
The memory test script used in the repair can also be found there.
This repair actually took months and was only possible thanks to the in-depth knowledge and patience of the people at Star Dot so a massive thank you to them as well.
The POSTBox diagnostic toll was sourced from Star Dot. Details of the unit can be found here: myelin.nz/acorn/postbox
Please note: There were times when I gave up on the repair for weeks at a time and there were some parts I did not set out to video. I had to cobble together some of the footage. There are a few short sections of handheld video towards the end. A few sections have less than perfect audio. Not terrible but I have tried to limit them as much as possible.
Credits:
Music: "Mind Over Matter" by Jay Man - http://ourmusicbox.com Creative Commons — Attribution-ShareAlike 3.0 Unported— CC BY-SA 3.0 http://creativecommons.org/licenses/b...
"drum-roll-sound-effect"
"Free Sounds Library" Free Sound Effects Site. Licence: License: Attribution 4.0 International (CC BY 4.0). http://www.freesoundslibrary.com
Good luck AllRandom Fix: Clone XBox 360 Wireless Gamepad RepairPlan C2021-07-25 | I fixed a Xbox 360 controller clone (Easy SMX) for a neighbour. Nothing Earth shattering. The right hand analogue stick didn't go up or down.
In this video, I replace the offending stick and make the parts sourced from Ebay fit this particular model. Fwiw, I think the controller was using gimbals based on the PS2.
I assumed that these parts would be interchangeable - a clone Xbox controller would suit Ebay parts described as for Xbox controllers. I was wrong...
Good luck all!ARMSID vs Real 6581 SID (Re-Upload)Plan C2021-05-10 | I originally put this up in September 2019 and then took it down with a bunch of other videos in a panic after some rap artist put a copyright claim in for me having a telly on in another room whilst I was doing a board repair video. (It turned out to be rubbish but it put me off Youtube for a few months).
I have re-uploaded this video to try to help people hear a fair comparison of the ARMSID to the original 6581 SID as many 6581 chips are failing now and we need to figure out how to make a replacement. I have tried to pick the tunes that may highlight any differences.
I do not pretend to own any of the 1 bar clips in this comparison video. All effort has been made to limit the use of any such material to a bare minimum in order to enable a fair comparison of hardware under reasonable use scenarios.
Copyright Disclaimer: Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship and research. Fair use is a use permitted by copyright statute that might otherwise be infringing.
The clips used in this video and their respective (and truly talented) creators are:
The Last Ninja - Ben Daglish The Last Ninja 3 - Reyn Ouwehand Monty on the Run - Ron Hubbard Thing on a Spring - Ron Hubbard Alien - Paul Clancey R-Type - C. Huelsbeck & R. Vaca Wizball - Martin Galway Golden Axe - Jeroen Tel
If anybody has an issue with me using these audio clips then I will take them down. Please let me know in the comments. Thanks.
The ARMSID was using the original firmware in this video.
Good luck All.Building a 128K ZX Spectrum Clone with an LED KeyboardPlan C2021-04-29 | In this video I show the process of building a brand new 128k ZX Spectrum clone complete with LED backlit keyboard. The Harlequin is a clone of the 128k Spectrum which is designed to fit in the original rubber key 48k case and uses off-the-shelf components to replicate the workings of the custom ULA chip used by Sinclair. As the original ULA chips age and fail, the Harlequin offers a way to continue using the ZX Spectrum.
Video shows the key steps of each stage of construction of both the computer and the keyboard.
Finishes with a reverse polarity protection mod to avoid any future problems.
Zelux Soldering Video: youtu.be/IhV53v_CBtERandom Fix: 12v Switch Mode Power Supply RepairPlan C2020-10-20 | A neighbour asked me to try and fix the charger for his robotic vacuum cleaner. I figured I would video it as it is a common failure in many switch mode power supplies.
Video shows disassembly, finding the faulty component and selecting a suitable replacement from my spare parts bin.
There will be some more retro computer stuff coming shortly.
Good luck AllAmiga 500 (Heavy) PSU Brief Walkthrough & RepairPlan C2020-09-15 | Repair of linear type Amiga 500 power supply from Ebay. Pretty simple fix. I love the simplicity and repairability of this type of unit. Quick waffle about how it works then on with the actual repair: Time Stamps: Getting into it: 0:27 How it works: 01:39 Actual Repair: 03:54
(More detailed reverse engineering video about this power supply with hand drawn schematics here:) youtu.be/kWHNvDOai-A
Good luck AllC64 Re-Brick Reloaded (re-uploaded!)Plan C2020-09-10 | Opened up the notorious C64 power brick. Tried to de-epoxy it and ended-up designing a modern replacement power supply to fit in the existing case. Video shows schematic, build and test under load.
Re-upload of a video that was removed due to copyright strike. Dates from 2017. Any copyright music removed.
I hope to do another improved version in the not too distant future...
Good luck AllEbay PS4 WLOD Repair (HDMI Port) & Clean upPlan C2020-09-06 | Bought a PS4 off Ebay which showed a black screen but a white light.
Replaced the mangled HDMI port,
Video shows: sped up disassembly, replacement of HDMI port, my method of port alignment, sped up replacement of thermal paste on APU, sped up cleaning of Blu Ray drive and sped up re-assembly.
Tools used: Aoyue 968A+ re-work station (soldering iron) Quick 861DW hot air station (on port) Duratool 80w desoldering gun (to unblock holes + hot air) Amtech NC-559-V2-TF flux Kapton tape Leaded solder T10 security screwdriver Phillips screwdriver Artic MX-4 thermal paste cocktail stick part of old credit card.
Good luck AllRandom Fix: Fixing a Blown XBox One Power Supply (PCB Repair)Plan C2020-08-28 | Bought and repaired a broken Day One Edition XBox One from Ebay. Ended-up repairing the power supply as it had failed fairly catastrophically.
Detailed the repair in the hope it may help others.
Component / values used in repair:
Switchmode chip: TNY277PN (or better)
R801: 1206 SMD resistor 2.2 Ohms / 2R2 C806: SMD Cap 37 pf R806: SMD Resistor 0608 '30C' OR 20KOhms Onboard fuse: T4A - 4 Amp time delay fuse Elecrolytic capacitor on burned trace: 10 uf/50v Cracked ceramic cap on 5v standby line: 10 uf / 50v MOV: 14N471K X/Y CAP: 0.47uf Mosfets on 5vsb rail: 2N7002,N, 60V
Adapter Used to convert XBox 360 supply for testing can be found on Amazon for about £6. Use at own risk but I don't see why it wouldn't work. I get nothing from it.
Good luck All...LED TV Black Screen Fix (Backlight)Plan C2020-07-20 | Fixed an LED TV for a mate and thought I would document it. Quick teardown, test of power supply, a way you can get away with bodging LEDs if there are just a couple of failed ones. I decided to change them all.
00:23 - How to check remote 00:45 - Check backlight 01:51 - Power supply overview 07:00 - Teardown summary 10:18 - Testing LED strips 11:26 - Finding individual bad LEDS and potential bodge fix
This machine is an LG 42LN5400.
Got the full set of LEDs from eBay for about £20.
Shopjimmy's detailed teardown vid for this particular model before starting here (most of these TVs are fairly similar) youtu.be/T2FboV-1PJg
Good Luck All.PS4 Washer Fix, 2 Year Tweak!Plan C2020-06-26 | I 'fixed' a broken PS4 off eBay using the washer fix about 2 years ago. It started playing-up recently ... just as I sat down with a new copy of The Last of Us Part II on Disc!
Since I had it open, I thought it would be worth showing the washer fix in case it is useful to anybody else. This is a well-known trick and not my idea.
This PS4 is an older model CUH1116A. It was originally sold to me (wrongly) as white light of death. I replaced the HDMI chip (not shown in this video) but it turned out it was really a blue light of death unit, which can be a bit of a nightmare.
The washer fix got it going and it has been working ever since ... touch wood.
Hopefully, this video may help others.
Good luck All.Amstrad CPC6128 Gotek, Bwack Saver and Mosfet Reverse Polarity Protection from Scrap Drone PartsPlan C2020-06-07 | I decided to tidy-up my Amstrad CPC6128 because it was running off two wall warts - one for the computer and one for the disk drive. One was centre pin positive 5v and one centre pin negative 12v!
To protect against future mishaps, I fitted a Bwack saver over-voltage unit in series with an n-channel mosfet that I pilfered from a broken drone ESC. I do some tests out of circuit to make sure it all works. I also fit a Gotek with an OLED screen and 3d printed bracket.
Video shows:
Wiring of Gotek to existing Amstrad cables Overview of programming Gotek (very brief) How to wire the Bwack saver into the Amstrad How the Reverse polarity protection mosfet works. Tests out of circuit. Fitting
youtube.com/watch?v=ZI-4UPEGNYQ&t=12s youtube.com/channel/UCEXX5i6961zc4-L8thTctBg3D Printed Surgical Mask StrapsPlan C2020-04-06 | Putting my 3d Printers to use to help fight the pandemic. These are easy to print and helpful to medical staff. Not my idea but worth promoting. Kudos to original developer. Will be printing and sending to my local areas of need.
Maker Mask - 3d Printed Mask: makermask.comRandom Fix: Hoverboard. No Power. Wont ChargePlan C2019-12-01 | Fixed a hoverboard for a friend. Symptoms were no power and wouldn't charge. Video shows teardown, replacement of component on mainboard (transistor), quick look at battery and charger, and sped-up re-assembly.
Good luck All.
Music: Busy As A Bee - Comedy | Super Fast - Royalty Free Music Music by: Jay Man
Links: http://OurMusicBox.com youtube.com/watch?v=R9CtCeqBgxUMaking and Testing a DodgyPLA (Open Source CPLD PLA for C64)Plan C2019-11-09 | Thought I would test the limits of my home etching and build a few CPLD PLAs for the Commodore 64.
Video shows cold toner transfer method, building of board from scratch, programming with a Xilinx programmer and iMPACT and then a quick test in one of my fussiest C64s with an especially fussy Super Zaxxon cartridge.
All of these are based on original work by skoe: bitbucket.org/skoe/pla/src/default Detailed Analysis of the C64 PLA: http://skoe.de/docs/c64-dissected/pla/c64_pla_dissected_a4ds.pdf
Music: –––––––––––––––––––––––––––––– Track: Affect — Vishmak [Audio Library Release] Music provided by Audio Library Plus Watch: youtu.be/5uh7qw3NPWA Free Download / Stream: http://alplus.io/AffectVishmak ––––––––––––––––––––––––––––––
🎵 Track Info:
Title: Affect by Vishmak Genre and Mood: Dance & Electronic + Dramatic License: Royalty free music for YouTube, Facebook and Instagram videos giving the appropriate credit.
———DIY C64 EPROM PLA Board with FiltersPlan C2019-10-13 | I threw together a single-sided PCB to convert an EPROM to be a PLA in a C64 breadbin. The design is based on filtering designed by Ray Carlsen. Video shows etching, construction and testing.
Original idea: Ray Carlsen. Idea for PCB from Mindflareretro's rePLAcement which was inspired by GadgetUK's OTP EPROM video.
Good luck All.eBay C64 Flaky CPU & Srange SD2IEC Read Error Fix (Re-upload)Plan C2019-09-28 | This is a re-upload of an old video. I took a few down after receiving an (erroneous) copyright strike from some rapper I have never heard of called liluzisomething (I had a TV on in another room on a different video)!
I put it back up with free to use music and sound effects as it is an unusual fault and may help somebody else to diagnose a problem.
It is an old mic so apologies for some of the audio. I since got a better one.
Correct: Triange - public domain - creative commons 0.Making & Programming a Nano Swinsid-bPlan C2019-09-22 | I followed Tolaemon's excellent tutorial to make a few SID replacements for some C64s. I used a cheap USBASP programmer and ProgISP instead of an expensive AVR programmer and Atmel Studio. Bonus drunk footage of un-bricking a mis-programmed Atmega using a TL866ii at the end
Good Luck AllTesting a Few DIY PLA Options (A Bit More Scientifically)Plan C2019-09-16 | I hooked-up a 74LS279 Latch circuit to my C64 test rig to test some DIY PLA solutions. The circuit tests for glitches in the PLA by means of a set/reset latch. I got the idea from MindFlareRetro's video below. I tested 45ns OTP ROMs with and without filters designed by Ray Carlsen, a supposed '906B' chip from eBay (supposed to be the only true drop-in EPROM - if you can find a real one), a couple of pre-programmed PLS100N's (the chip Commodore copied) and a known glitchy MOS PLA for reference. For the record, the eBay vendor that I bought the PLS100Ns from was very professional and issued my with a replacement without issues. He couldn't have been more helpful.
The chips tested were:
1) Atmel AT27C512R4RU - OTP Chip - Just CASRAM capacitor
ps I recently got a copyright strike from Youtube for using, of all things, circus music! I have taken down two other videos as a precaution:
C64 Flakey PLA Fix & C64 Re-brick reloaded
If I can find them, I will re-upload with no circus music!
Good luck All
Music is: –––––––––––––––––––––––––––––– Track: Affect — Vishmak [Audio Library Release] Music provided by Audio Library Plus Watch: youtu.be/5uh7qw3NPWA Free Download / Stream: http://alplus.io/AffectVishmak ––––––––––––––––––––––––––––––
🎵 Track Info:
Title: Affect by Vishmak Genre and Mood: Dance & Electronic + Dramatic License: Royalty free music for YouTube, Facebook and Instagram videos giving the appropriate credit.
———Fix Ethernet Cable Clip with Two Zip TiesPlan C2019-09-07 | Easy way to fix an Ethernet cable which has a broken clip and keeps falling out. There are variations on this technique and it is not my idea but, as I had a broken cable, I thought I would demonstrate it.
Requires only two 2.5mm wide cable ties. Saves an otherwise good cable.
Also a good excuse to test out a new mic lol.
Good luck AllRe-Homing a Repaired A500+ Board (The Hole Story Part II)Plan C2019-08-25 | I wanted to turn the last A500+ board I repaired back into a full Amiga as the board was in very good condition.
I sourced a damaged A500+ case that somebody had hacked-up cheaply from eBay and set about repairing it with a mix of 3d printed parts, putty & paint. Also programmed and fitted a Gotek floppy emulator in a non-destructive manner.
Music: Bleeps Galore by Roccow - www.freemusicarchive.org Planetcruizer by Skip - www.freemusicarchive.orgeBay C64: Numerous Faults & Repairs (250407)Plan C2019-08-20 | This C64 had been in the wars. After cleaning and fixing some obvious faults, it lead me a merry dance, despite repeatedly passing diagnostic tests! The diag cart reported the bad RAM (which I should have paid more attention to) but missed a flaky PLA and a glitchy SID.
List of faults & fixes with timestamps:
Pre-powerup tests 00:35 Graft new leg onto VIC II Chip 02:38 Out of Memory Piggyback RAM tests 03:44 Case repair using Acetone 06:07 Strange PLA graphics issue 06:56 Gitchy SID 09:04 Cleanup montage 05:54
Music Credits: –––––––––––––––––––––––––––––– Track: Affect — Vishmak [Audio Library Release] Music provided by Audio Library Plus Watch: youtu.be/5uh7qw3NPWA Free Download / Stream: http://alplus.io/AffectVishmak ––––––––––––––––––––––––––––––
🎵 Track Info:
Title: Affect by Vishmak Genre and Mood: Dance & Electronic + Dramatic License: Royalty free music for YouTube, Facebook and Instagram videos giving the appropriate credit.
———Fixing a Faulty Amiga 500 Plus Board: The Hole StoryPlan C2019-08-07 | I bought a 'non-working, for parts only' A500+ board off eBay as I wanted to rescue it. I negotiated a price but still probably overpaid lol.
It had all chips stripped and was claimed to have a grey screen/no boot. When it arrived, I had a bit of a surprise! The hole wasn't the issue though...
The fixes were pretty simple so I have detailed the whole process.
To save you having to look at the schematic, I have linked a helpful picture that I found on the web and my half-arsed spreadsheet of the main connections below. The picture was by kipper2k on eab.abime.net. The thread is also linked below for reference.
Music is: –––––––––––––––––––––––––––––– Track: Affect — Vishmak [Audio Library Release] Music provided by Audio Library Plus Watch: youtu.be/5uh7qw3NPWA Free Download / Stream: http://alplus.io/AffectVishmak ––––––––––––––––––––––––––––––
🎵 Track Info:
Title: Affect by Vishmak Genre and Mood: Dance & Electronic + Dramatic License: Royalty free music for YouTube, Facebook and Instagram videos giving the appropriate credit.
———Building and Fitting a Bwack C64 Saver v2.4Plan C2019-08-02 | Thanks to Bwack for open-sourcing version 2 of his awesome C64 saver!
In this video, I build one, do a quick test and then fit inside a previously repaired C64.
A lot of work went into the design of the Bwack saver and it's predecessor, the Ray Carlsen saver. They are both designed to protect a C64 from a failing power supply which can kill irreplaceable chips through over-voltage.
Thanks to Bwack and Ray for keeping these machines alive.
Here is the BOM I got from the schematic: Q2 = IRFR5305 (SMD) Q1 = 2N7000 D1 = TL431 C1 = 47uf 16V D2 & D3 = 6v8 Zener R1 = 3K9 R2 = 3K3 R3 = 3K3 R4 = 330K R5 = 3K3 R6 = 3K9 R7 = 33K R8 = 82K
No 0.1uf cap required
Good luck all.Getting into & Attempting to Back-Engineer an Amiga 500 (Heavy) PSUPlan C2019-07-20 | In this video I gently open an Amiga 500 power supply which has very well-hidden screws and then attempt to reverse engineer it with a few homemade schematics.
This is the 'heavy' / linear version of Amiga power supply. I take it apart in a non-destructive way so it can be put back as original. I just wanted to check the caps etc out but while I was in there I thought it would be interesting to try and figure out how it works.
I go through my understanding of how each rail works one at a time.
I did this purely to aid my own understanding but thought it may be useful to others somehow. Please let me know if you think I got anything wrong lol!
The model is 312-503-02. Made in West Germany. I usually use a converted ATX but like to have the originals as well.
Good luck All.Is this Samsung Travel Adapter Genuine?Plan C2019-07-16 | Wasn't sure if a Samsung charger I bought online was fake so I compared it against some known genuine ones on an old oscilloscope and then I tore it apart...
What was inside was slightly unexpected.
It is an ETA-U90WE. Apparently, Rev 1.4
I modify it slightly to improve the output and will keep it as a spare.
Update: I am now pretty convinced it is a good fake. I bought an identical unit from a reputable source for comparison. The fake weighs 47g, the real one weighs 53g. The model numbers are identical. The text is identical and the ink is identical. The real one shows shows max 50mV ripple at 2 amps and tops-out at 2.2a before folding back. The fake manages maybe 1.7a with severe voltage sag and more than 400mV ripple before collapsing. It also shows 200mV ripple at 1 amp. The real one increases output voltage to compensate for losses as the amps drawn increase. The fake does not. I also noticed a listing on Alibaba showing an identical board to the suspect one and the vendor has disappeared lol. It may be that this was an inadequate early revision but I doubt it. In any event, it hasn't given me any problems (apart from providing noisy power to my phone).
Very difficult to spot. The main giveaway was the improper safety capacitor.
Good luck all.
Test Equipment Used: Hameg 20MHz Oscilloscope - Second-hand, eBay Unit-T UT658 USB tester - Purchased online British Standard Isolation Transformer - Second-hand, eBay 60 Watt 30V Electronic Load - Purchased onlineReplacing the MOVs in an Ageing Surge Protection StripPlan C2019-07-04 | After a lightning strike knocked out the router at my parent's house, I figured it was time to replace the Metal Oxide Varistors in my ageing surge protector strip. It was getting on and they wear out over time. Quick walkthrough of how I did it.
Not the most exciting repair. Pretty simple preventative maintenance. Just a couple of pence on parts and a bit of soldering.
Should keep it going for a while and keep it out of landfill anyway...
It is also a good idea to put surge suppression on the cable modem coax...
Good luck all.Netgear Power Supply Repair (& Moan About Some eBay Chargers)Plan C2019-06-16 | Overview of a simple fix for a Virgin Superhub 12v power supply. Turned out to be the output cap.
Quick overview of main components followed by a whinge about some other USB and wallwart power supplies that I have torn-down.
EDIT: THE BLUE CAP IS A CLASS Y1 SAFETY CAP NOT Y2. For more explanation about the different types see here:
These smoke alarm and shut-off systems are hobby grade projects made in my spare time and are not intended to be a substitute for monitoring your 3d printer. Use at your own risk and never leave your 3d printer unattended. If you are in doubt about working with mains power then leave it alone and ask somebody who is qualified to help you.
Good luck all.Acorn A3000 Repair Part 2, Case, Keyboard Connector & Membrane Fixes + Sound ModPlan C2019-04-26 | Follow on to previous video where I repaired a battery damaged A3000. In this video I fix all the broken case catches, do the Zarchos sound mod, repair the keyboard membrane, make new keyboard connectors, clean the floppy drive, scope the power supply and test it (it is fine!)
Good luck allArchimedes A3000 Mods: Gotek with OLED & Compact Flash Hard DrivePlan C2019-04-02 | With help from the guys on the Stardot forums and using a Gotek floppy emulator (flashed to the latest firmware), I finally got a compact flash 'hard drive' working in my A3000! Video shows steps taken. May or may not be the correct approach but seems to work so far... Not perfect. Very occasional filecore error on initial first boot if case open. I am currently blaming that on a bad connection as it seems to go away with the lid closed lol. I also saved some ailing discs in the process and show a 3d printed CMOS battery mod designed to fit in the bay provided.
Good Luck All.Unscientific Testing of DIY PLAs on Five C64sPlan C2019-03-25 | I made a couple of DIY PLA chips by following the instructions on GadgetUK164's excellent video here: youtu.be/sT4OBNvboJ0
I then tested the substitute PLAs in each of my five C64's.
The tests are not very scientific and were done more out of interest than anything else.
For an in-depth discussion of the workings of C64 PLA (and different replacement option including the PLAnkton) see Mindflareretro's excellent video here: youtu.be/ofg33zk9uCA
UPDATE: I subsequently repeated this experiment on these 5 machines with some M27C512-90B6 Chips from Ebay. I am not sure if they are genuine or not. They are marked 'Korea' and claim to be made by ST Microelectronics. These worked in ALL my 250407 boards (1*Rev A, 2*Rev B and 1*RevC) for at least 20 passes of the diagnostics cart and no capacitor was needed between CASRAM and Gnd. I got all excited and bought 10... Then I discovered that the chip does not work on my 250425 board. The diagnostics would not run and strange key presses were returned under normal operation. It has been suggested that removing Capacitor 203 on this board may improve things with this chip, but I could not find C203 on my particular 250425 board!
Good luck all.PLAying Around with a Black Screen eBay Commodore 64 (Fix)Plan C2019-03-01 | Repair of Breadbin C64 with black screen from eBay. Tests with a PLAnkton PLA substitute and chip swapping with my test bench had me scratching my head. Pretty simple fix in the end but not what I was expecting.
The PLAnkton I used in the first part of the video is Detailed here:
Good Luck AllSinclair QL Fixes, White Screen, Easy Composite PAL, ATX Power Mod, MicroDrive TestsPlan C2019-02-13 | Had these sitting around for a while with no power supply. Fix of one QL with a white screen (upper ram fault), replacement of keyboard membrane, composite PAL video without mods and how to power the unit inc microdrives from an ATX in a way that can be easily reversed later.
Later part shows my ham-fisted testing of the microdrives on two QLs with some cartridges from ebay and some attempts at fixing one microdrive which refused to read. 3/4 worked in the end.
Good Luck All.Easy Fix for Loose HDMI PortPlan C2019-02-10 | 5 minute fix. Will work for any HDMI port. Shown on a GTX 970 graphics card as the connection on mine was playing-up. No soldering or special tools required. Worth a try if your image is cutting out and getting annoying.
Good luck alleBay Retro Joystick RepairPlan C2019-02-03 | Used a broken HDMI cable to repair a C64/Amiga/Atari/ Joystick with a strange fault. Probably just should have bought another cable but it turned into a bit of a mission lol.
Quick look at and fix of the auto-fire (555 timer circuit).