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#electronicsrepair

1 post1 participant0 posts today
Public *
in_sympathy

You can’t always win - two Pi’s arrived today - both are not fixable. One is a Raspberry Pi 4B with a dead CPU - a really rare case tbh. It gets to 80+ °C while taking a fixed (dead) amount of current around 800 mA.

The second one is a Raspberry Pi 5 with an exploded (!!!) RP1 chip - impossible to buy, so 99% unfixable as well. Only if customer will source a donor with a good RP1, which is next to impossible sadly.

#raspberrypi#electronics#repair
Public
in_sympathy

New day - new Raspberry Pi brought back to life 😃

This one probably fell down because it had no shorts, all voltages from DA9090 were present, but it didn’t start most of the time - it did once but then I spent quite some time trying to figure out where is our issue.

Reflowing CPU and RAM chips must have helped ✅

#raspberrypi#repair#ifixit
Public
Sunflower Björnskalle 🌻

Wow, this was a surprisingly detailed article about how to fix a jumpy mouse scroll wheel by fixing or replacing the encoder.

Unfortunately, I do not feel up for this right now actually. It's cool to know it's possible though.

makeuseof.com/fix-mouse-scroll

MUO · How to Fix a Mouse Scroll Wheel Jumping Up and DownMouse scroll wheel jumping up and down and making control difficult? Here's how to fix it.
#electronics#consumerelectronics#electronicsrepair
Public
rawe

So my #Bosch #Intuvia display started to fail to wake up the battery/motor on power on. Its still possible to press the button on the battery to wake it and the motor up but... eh.

Now it got a new smol LiPo. It lasted 25000 km / 1990 hours / 10 years so not bad.

25007 / 1990 hours - thats way too slow? Yes, it counts the time on the charger as well so this is ride time + charge time = total on time (minus the time where I charged the battery directly / not in the bike).

Odometer reading 25007 km
1990 hours total runtime
Disassembled unit with new LiPo
#diy#electronicsrepair#mdrza
Public
in_sympathy

Something a bit different - a #Raspberry Pi #CM4 with a CM4-NANO-B carrier board by #Waveshare.

Customer accidentally put this assembly on a metal surface and it did got shorted.

DA9090 PMIC was dead and had been replaced, but it took me quite while to figure out how to make it work again - see the thing is that when you flick the switch on a baseboard CM4 won't turn on. You have to power the whole thing down, flick the switch to ON then then power it 🤦🏻‍♂️.

#repair#electronicsrepair
Continued thread
Public *
in_sympathy

But this time I was finally ready - I received this large universal reballing stencil from AliExpress where the first 18x18 option fits the RP1 perfectly.

So instead of reflowing again I just took it off the board, reballed and soldered nicely.

After letting it cool down for 10 minutes next to an open window it works as it should now 👍.

aliexpress.com/item/4001204908

#raspberrypi#raspberrypi5#repair
Continued thread
Public *
in_sympathy

There also was a Raspberry Pi 5 with ripped capacitors of the RP1 chip. Without them Pi would not start and would not even get the firmware updated.

I restored those and later covered all of that with UV mask.

But that wasn't enough - had to also reflow RP1 chip because its contacts were damaged too.

This customer was really lucky because that not doesn't always work well, but it did this time.

#raspberrypi#repair#ifixit
Public *
in_sympathy

Interesting Raspberry Pi repairs today.

First - Pi 3A Plus. Clear burn marks and dead short on a 5V rail.

Usually it's the diode, so I didn't even check it - just got it replaced.

And - surprise - it was not the diode 😂. It turned out to be a 50 uF capacitor right next to it.

A nice and easy fix - one more happy customer ✅

#raspberrypi#repair#ifixit
Public *
Zero Otterwolf

Okay, I'm sending out a call for help. I'm trying to repair my soldering iron, after I turned it on one day and it went "POP" and wouldn't heat up.
I located the damaged part, a transistor that is half missing.
I can't identify the part however. All I can make out is "A6" and "322" on the part.
Help me Mastodon, you're my only hope!
#ElectronicsRepair
#electronics

Public *
in_sympathy

But it's not all failures. Some other customer sent in his NanoPi NEO 512. It a was nice, fast and easy fix - MP2143DJ IC got hot up to 150+° C, so I ordered and replaced it right away ✅.

Again - life is so much easier with schematics:
wiki.friendlyelec.com/wiki/ima

And here's a datasheet for that part:
monolithicpower.com/en/documen

#sbc#orangepi#repair
Public
in_sympathy

Someone sent me an Orange Pi 5 Pro the other day for repair and sadly I was not able to fix it, thought the issue was quite obvious.
RK806-1 PMIC not only blew up - it catched fire and welded itself to the board so badly that I was unable to remove it. It also took an SY8089AAC with it.

How did that happen? He used a DC-DC step-down converter. No idea why and how, but I''d avoid using those converters at all costs.

#sbc#orangepi#repair
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