Instead of randomly swapping out parts, most novice repair individuals spend way too much time doing this; you should break your circuitry down into smaller functional parts to test and repair.

First you would start with the AC Input, followed by checking each circuit from the Rectifier to the PWM control, then to the Switch, then to the Transformer, then finally the Secondary Out Put and lastly back to the Feedback circuit; so, if you haven’t found the problem or repaired it from the previous step you can skip this step with confidence, because you already know where and or what the problem is with the circuit.

Using this very simple methodical approach for troubleshooting is not only extremely effective but will also save you a significant amount of time from trial and error and guesswork in replacing parts, because now you understand how all the circuits work together and the order that they need to be repaired.
#ElectronicsRepair #SMPS #Troubleshooting

Carter Ca the part for John Deer is written into their purchase agreements, they can only be serviced by authorized service providers or it voids the warranties and John Deer will cut all software on their new tractors (which basically bricks most of the useful functions) unless authorized service techs do repairs even after warranties expire.

Deere settles US right-to-repair lawsuit with $99 million fund, repair commitments
https://www.reuters.com/sustainability/boards-policy-regulation/deere-settles-us-right-to-repair-lawsuit-with-99-million-fund-repair-commitments-2026-04-07/

April 6 (Reuters) – U.S. agriculture equipment maker Deere (DE.N)
, opens new tab on ​Monday agreed to pay $99 million into a settlement fund for ‌farms and farmers that are part of a class action over costs and access to repairs.
The case is part of broader scrutiny in the U.S. over so-called ​right-to-repair practices, with regulators and plaintiffs arguing that some ​manufacturers limit competition by controlling access to repair tools and ⁠software.

Having a charger installed at home for your electric car is very convenient, not only for the obvious home charging, but also for having scheduling and other features built-in. Sadly, like with so many devices today, these tend to be tethered to a remote service managed by the manufacturer. In the case of the JuiceBox charger that [Nathan Matias] and many of his neighbors bought into years ago, back then it and the associated JuiceNet service was still part of a quirky startup. After the startup got snapped up by a large company, things got so bad that [Nathan] and others saw themselves required to find a way to untether their EV chargers.

The drama began back in October of last year, when the North American branch of the parent company – Enel X Way – announced that it’d shutdown operations. After backlash, the online functionality was kept alive while a buyer was sought. That’s when [Nathan] and other JuiceBox owners got an email informing them that the online service would be shutdown, severely crippling their EV chargers.

Escaping the chains of tethered products: the Juice Rescue project
https://natematias.com/portfolio/2025-08-22-unchaining-from-broken-software-tethers/

https://www.404media.co/developer-unlocks-newly-enshittified-echelon-exercise-bikes-but-cant-legally-release-his-software/

An app developer has jailbroken Echelon exercise bikes to restore functionality that the company put behind a paywall last month, but copyright laws prevent him from being allowed to legally release it.

Last month, Peloton competitor Echelon pushed a firmware update to its exercise equipment that forces its machines to connect to the company’s servers in order to work properly. Echelon was popular in part because it was possible to connect Echelon bikes, treadmills, and rowing machines to free or cheap third-party apps and collect information like pedaling power, distance traveled, and other basic functionality that one might want from a piece of exercise equipment. With the new firmware update, the machines work only with constant internet access and getting anything beyond extremely basic functionality requires an Echelon subscription, which can cost hundreds of dollars a year.

In the immediate aftermath of this decision, right to repair advocate and popular YouTuber Louis Rossmann announced a $20,000 bounty through his new organization, the Fulu Foundation, to anyone who was able to jailbreak and unlock Echelon equipment: “I’m tired of this shit,” Rossmann said in a video announcing the bounty. “Fulu Foundation is going to offer a bounty of $20,000 to the first person who repairs this issue. And I call this a repair because I believe that the firmware update that they pushed out breaks your bike.”

App engineer Ricky Witherspoon, who makes an app called SyncSpin that used to work with Echelon bikes, told 404 Media that he successfully restored offline functionality to Echelon equipment and won the Fulu Foundation bounty. But he and the foundation said that he cannot open source or release it because doing so would run afoul of Section 1201 of the Digital Millennium Copyright Act, the wide-ranging copyright law that in part governs reverse engineering.

“It’s like picking a lock, and it’s a lock that I own in my own house. I bought this bike, it was unlocked when I bought it, why can’t I distribute this to people who don’t have the technical expertise I do?” Witherspoon told 404 Media. “It would be one thing if they sold the bike with this limitation up front, but that’s not the case. They reached into my house and forced this update on me without users knowing. It’s just really unfortunate.”

“A lot of people chose Echelon’s ecosystem because they didn’t want to be locked into using Echelon’s app. There was this third-party ecosystem. That was their draw to the bike in the first place,” O’Reilly said. “But now, if the manufacturer can come in and push a firmware update that requires you to pay for subscription features that you used to have on a device you bought in the first place, well, you don’t really own it.”

“I think this is part of the broader trend of enshittification, right?,” O’Reilly added. “Consumers are feeling this across the board, whether it’s devices we bought or apps we use—it’s clear that what we thought we were getting is not continuing to be provided to us.”

Witherspoon says that, basically, Echelon added an authentication layer to its products, where the piece of exercise equipment checks to make sure that it is online and connected to Echelon’s servers before it begins to send information from the equipment to an app over Bluetooth. “There’s this precondition where the bike offers an authentication challenge before it will stream those values. It is like a true digital lock,” he said. “Once you give the bike the key, it works like it used to. I had to insert this [authentication layer] into the code of my app, and now it works.”

Witherspoon says that, basically, Echelon added an authentication layer to its products, where the piece of exercise equipment checks to make sure that it is online and connected to Echelon’s servers before it begins to send information from the equipment to an app over Bluetooth. “There’s this precondition where the bike offers an authentication challenge before it will stream those values. It is like a true digital lock,” he said. “Once you give the bike the key, it works like it used to. I had to insert this [authentication layer] into the code of my app, and now it works.”

Roberto Viola, the developer of a popular third-party exercise app called QZ, wrote extensively about how Echelon has broken his popular app: “Without warning, Echelon pushed a firmware update. It didn’t just upgrade features—it locked down the entire device. From now on, bikes, treadmills, and rowers must connect to Echelon’s servers just to boot,” he wrote. “No internet? No workout. Even basic offline usage is impossible. If Echelon ever shuts down its servers (it happens!), your expensive bike becomes just metal. If you care about device freedom, offline workouts, or open compatibility: Avoid all firmware updates. Disable automatic updates. Stay alert.”

Witherspoon told me that he is willing to talk to other developers about how he did this, but that he is not willing to release the jailbreak on his own: “I don’t feel like going down a legal rabbit hole, so for now it’s just about spreading awareness that this is possible, and that there’s another example of egregious behavior from a company like this […] if one day releasing this was made legal, I would absolutely open source this. I can legally talk about how I did this to a certain degree, and if someone else wants to do this, they can open source it if they want to.”

What can you do if your circuit repair diagnosis indicates an open circuit within an integrated circuit (IC)? Your IC got too hot and internal wiring has come loose. You could replace the IC, sure. But what if the IC contains encryption secrets? Then you would be forced to grind back the epoxy and fix those open circuits yourself. That is, if you’re skilled enough!

https://www.youtube.com/watch?v=9y7xRpFYLjk