ฝัง
- เผยแพร่เมื่อ 25 ส.ค. 2024
- Why has the sound become weird and crunchy on my A1200? Is it because all A1200's have failing capacitors? Well...
In this video we recap an Amiga 1200, and then find out what was really wrong.
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Amiga Metal Gear port - h0ffman.itch.i...
Music Credits:
Fynestlynk by Noir Et Blanc Vie - • FynestLyk
Vital Whales by Unicorn Heads - • Vital Whales
Most people might struggle to isolate & identify bad caps. So a complete recap is their best bet.
You say replacing capacitors you didn't need to but its a well documented problem and isn't is easier to replace them now before they leak causing problems? You did a good job with it and as you say that's it now done for many more years use.
It's definitely nice to have it done, always difficult to know with preventative maintenance if you 'needed' to do it yet!
These caps don't see much wear or high temperatures unless there's a 040 or higher accelerator and mechanical hdd in it. Still can't hurt if you don't damage pcb and bridge pins etc.
My first thought was to check voltages with an oscilloscope. That would've pointed you towards psu issues. I suspected the opamp.
Also consider getting low melt solder, it makes it much easier to get stuff out with large pin counts without damaging the pcb.
All in all you did a good job!
Oh can you use low melt solder to help melt the existing solder to remove things?
I recapped my “spare” A1200 the other month. All went well except a THT lost a pad. Very annoying but I rescued it. Didn’t fix the underlying poor video though. And then I broke the clip holding the space bar’s bar on. Very annoyinng! I used two layers of aluminium tape and hot air to remove the SMTs near the keyboard connector; much easier IMO.
For my “baby” (purchased in 1992 when I was about to start uni) I didn’t chance it and limited my surgery to fixing the non existent sound output. Turned out to be the quad opamp IC. Swapped it over and she sounds just like she did when new. Retrobrighted her too. Just went very very easy on the plucking the keys off this time. It’s great having her look great. I even found one of my newish Dell monitors does PAL and multisync, which is absolutely fantastic for workbench and games via WHDLoad.
Hope you are keeping well!!!
Oh that is some good luck finding a monitor that works well! Doing alright thanks, now I can treat myself to opening up my new thrift store purchase.
the music is so loud I can barely hear you.
Good to know, I'll tweak it a bit in future
have you recapped your 1084s?
No the insides of CRTs give me the fear! I have the 1081, it's Amiga branded which I haven't seen so much.
Yeah, sadly changing capacitors has become an internet meme. Everybody is doing because everybody else is doing it and not because it needs to be done. It is partly understandable as there was a short period, the late 1990s to early 2000s, when capacitors were being made sub-par and bad cap syndrome was a thing. Your Amigas, and many of the early home computers, are from a period before this time and clearly have decent quality caps. I see too many TH-cam videos of people with very poor soldering skills replacing perfectly good capacitors with ones of dubious quality to end up with a computer of worse reliability than when it started. Capacitors do fail, dont misunderstand me, but this blanket change mentality is bad.
It's tough to know where the truth lies. I did have some sympathy for the idea that these marked the change from through hole to surface mount, and that might mean they were new and risky at the time.