Categories
Computing

15″ MacBook stiff screen

My 15″ MacBook dating to early 2013 (or so it claims) had been getting very difficult to open recently. This culminated in the screen popping up about a quarter of an inch when closed, the magnet just not strong enough to hold on. So, time to get the diddy screwdrivers out. I had looked on the Web for tips and found some discussion of removing the screen to clean the hinges, not something I was looking forward to but I decided to have a look anyway.

On removing the base I was presented with this!

That’s a lot of fluff! Ok, I’ve had it from new, so it’s 8 years of fluff (has it really been 8 years?).

Anyway, after de-fluffing all I did was very carefully, and with a teeny bit of WD40 sprayed onto a cotton bud cleaned the parts of the hinge that I could see. And that did the trick. No need to dismantle or otherwise adjust anything fortunately. YMMV of course, but it worked out for me.

But… 8 years! And it will not take the latest OS… sad.

Categories
Computing

MacBook Pro battery replacement

Recently the battery in one of our old MacBook Pro laptops gave up the ghost, big time. First, it would run for a few minutes but not long after it was totally dead, with the Mac loosing power completely if the charger was removed. We replaced this Mac as it was a vital component in our IT armoury but I wanted to fix it and, hopefully sell it as working. It’s a 2015 13″ model.

So, off to the excellent iFixit site, specifically in our case this. The guys that put these pages together are a huge help to those of us daring to venture into repairing our own kit. Anyway, I have a decent range of tools for abusing small electronic devices such as phones and laptops, so why not?

The case comes apart quite easily:

Getting the battery unstuck – my goodness they glue them in well – is hard but not so much so that it cannot be done with care. A note here, this is solely from my own experience, do not rely on this!

It took maybe 20 minutes and 4 old credit cards to very carefully unstick the entire battery. I had a new OEM battery from the Replace Base that arrived within a day, came in a neat package and included the necessary screwdrivers but I already have plenty. The price of the battery was somewhere between the cheapest eBay price for a non-OEM part and the price from Apple. Everything went back together with no screws left over (!) and the Mac works nicely, holding 100% charge and with a battery recharge indicator of 1. oh yes and I managed to throw Big Sur onto the Mac too.

I have to say though, I went through this because I have some time, being retired, and I wanted to not be beaten by something that should be simple, i.e. changing a battery. Having been through the exercise, and bearing creases on my palms for a couple of days from the force needed to unstick the battery, paying Apple to do this is actually fairly good value for money!

Categories
Computing

Why is this so hard

I had to edit and then print an official form downloaded from a Government website today. All it needed was some names and addresses putting in at the prescribed lines. Easy… hmmm.

First off, the form is an MS Word document. Ok, I have Pages on the Mac. Ah, but the format is wrong and lines appear in places they should not. Oddly, the first half is fine, but the second where it needs a date entering ends up with a line through the date.

Ok. Borrow a laptop that has Word. Download the form again and it was filled in properly. I had to struggle to get a USB stick to be recognised even though it has been in there before – two goes and it found it. This is because I did not want to store the edited document on the laptop at all, well, other than whatever temporary files Windows wants to create.

So, to print.

The laptop will not find the printer

The copy of Word will not print to PDF

Ugh!

Finally I managed to export to PDF, stuff it on the USB, put the USB in the Mac, open it (and check the format is still ok! The ‘p’ in PDF is not always what it makes out to be) and print it.

Two laptops, one USB stick, about 10 edited lines in a document.

Easy.

Categories
Computing

Random PC woes

This morning the rig would not go into transmit via wsjt-x. It worked fine last night up to when everything was shut down and there were no changes to anything, hardware or software. Rebooting the PC made no difference. CAT control was working both ways and it was receiving FT8 fine. I noticed that transmitting would sometimes change the rig settings e.g. from data to non-data.

I tried the flrig / fldigi combination but transmitting via this messed the FT450D’s settings up in that it was rapidly triggering tx and the rig decided to engage its internal tuner.

Plugging the two USB connectors into the front USB sockets on the PC made it work but the transmit levels are mad – ALC is triggering and the rig does not generate any decent power with this turned down. ALC is on a knife-edge where it goes from very little power / no ALC via the SignaLink TX control to 50% ALC and proper power output with nothing in between. Fiddling with the audio settings on the PC and in wsjt-x makes little difference.

But changing the Mode to Data/Pkt in Settings -> Radio does improve the ALC business. This was set to None and I cannot remember if this is a change or not.

The audio settings via pavucontrol are set to 100% for the USB audio. This was 120% before as otherwise the rig would keep falling out of Tx on 40m. Wsjt-x’s tune function is holding up on 40m at 100% so there is a change there for no apparent reason.

All the PC USB ports are USB2.0 so there is no difference there. Trying a few CQs on 17m shows that FT8 is being received across Europe so it is all working. The same is true to 40m.

Weird. The only physical differences between it not working at all this morning and now are the two USB cables are plugged into the front sockets and the USB leads are away from the antenna coax. But the latter, i.e. the cable routing has always been along the same path as the coax and it has worked every day without issue.

Categories
Computing

Corrupt SD cards

Those of you with Raspberry Pi systems or similar (other small sized computers are available!) will feel my pain…

A few days ago my little web and all-sort-of-other-stuff server fell over. I had no idea why but it seemed to reboot ok. I suspected we’d had a very short power outage but checking the other Pi systems (there are 4 here) all had long uptimes. Anyway, it all came back ok, or so it seemed.

It runs a process every minute to grab data off the weather station and displays this on my private website, which it also serves. The website simply tails a log file and was now showing a Linux error message which looked ominous. Checking the Pi it has gained a nice little file system error and the temp file the weather station grabber creates was corrupt. Rebooting cured this (it runs fsck on boot). That cured the weather station data but the problem persists.

So far there are no other obvious issues except it writes ext4-fs warnings to syslog every time something does anything. No biggie, these are only log files.

So, thought I, I’ll fsck the SD card. Ok, can’t do that running so it needs to be mounted on another system. Where do I have an SD reader? My little Samsung Netbook has a version of Ubuntu on it so I can use that.

This is where things went south. The Netbook takes a while to boot but takes an age for the GUI to settle. And I mean 30+ minutes and still it sits there! Come on, I can do a Windows update faster… Ah, found a USB SD card reader, I can use my desktop instead (the Netbook is destined for eBay I suspect). So, let’s plan this logically. I shut the Pi down (a caveat here is it’s also the NFS server and serves a disk to another Pi that does all the CCTV recording… probably better that one had its own disk!!), pull the SD card, stuff it on the desktop Linux box and fsck the filesystem. There’s a danger it will fsck to death and become useless but everything is backed up or can be reinstalled, all I need is a clean SD card. Um…

Ok… scratch that and order some SD cards first! Ugh.