32bit Commodore Amiga Repair-a-thon - Part 3 (A1200 x 4)

If you would like to support the channel via Patreon (keep the channel running) - / gadgetuk164
You can also buy me a coffee or donate via Ko-fi - much appreciated! ko-fi.com/gadg...
In this part of the series we start looking at 4 x Amiga 1200 motherboards with various faults.
Thanks to Stefan Skotte and Raj for providing these for repair!
Part 4 - • 32bit Commodore Amiga ...
Part 2 - • 32bit Commodore Amiga ...
Part 1 - • 32bit Commodore Amiga ...
#commodore #amiga #repair

[@GadgetUK164]

Part 4 - kzbin.info/www/bejne/n2XXmJV-bdd7n9k Part 2 - kzbin.info/www/bejne/pYnLeXtrfdWIars Part 1 - kzbin.info/www/bejne/qJSzcqV6oJJ6qqc A4000 Repairs (Playlist) - kzbin.info/aero/PLMjdUTC-GcRORUqaYrbvrbym3fzi16E0N

[@FirstWizardZorander]

That small beer joke made me smile for the first time today. It's the small things :)

[@RetroMarkyRM]

An amiga repairathon on a Friday night?....Oh yes please! :-)

[@omegamsx]

Good stuff! Proper diagnosis there! Top tip: if the ADV101 type dac is used, the LM385 and C215/R215 (bottom) need to be fitted. If the VP101 dac is used, those three components aren't fitted but the small cap below the LM385 is (~0.1-1uF)

[@GadgetUK164]

Thanks, I wasn't aware the ADV101 needed the LM385! In the next part I totally omitted that after swapping the VP101 for an ADV101 on one board. However, I measured 1.2v there on the vref, and it behaved totally normally!?! I've let the owner of the board know (he can easily fit an LM385-1.2 and the other components if needed.

[@omegamsx]

@@GadgetUK164 I think it's worse the other way around, if D215 is fitted when a VP101 is used, you get offset white levels I think (too much brightness). If it works ok now, no need to change it I guess!

[@8BitRetroJournal]

So much fine soldering...I struggle with surface mount stuff so much. BTW, apologies if I already invited you but May is celebrating the Amiga (just add hashtag #AMayGA to your May Amiga videos if you want to join). I'm getting an A600 soon that will need recapping so I'll get another crack at fine soldering :-/

[@LeftoverBeefcake]

Thanks for this video series! I was hoping you'd get around to fixing more A1200 boards. I have a stubbornly broken PAL A1200 board I got off eBay a while back with many problems and this gives me more things to consider. I already know there's an issue with the video DAC, as I could trace the blue video signals going into the chip but almost nothing coming out. It also had some bad ferrite beads going into the RGB connector, and someone had already removed the RF modulator and did a crappy job doing it... it's a real nightmare. Also there's the case of the missing mouse pointer - the pointer image is gone but it registers mouse clicks like normal. It's so very close to working... and maybe with the help of your videos I can get it completely solved.

[@TheHighlander71]

I like nightmares Chris. It's always fun to watch you find your way through the problems to solve these things. I'd be frustrated out of my sanity :)

[@GadgetUK164]

Thanks Wouter =D

[@georgelea4297]

Another Amiga repair video Chris, yes eating my dinner watching this

[@AdamSommer70]

Very interesting, thanks for posting!

[@SabretoothBarnacle]

Nice repairathon there👍🏻 I'm assuming that hot air station is the one with the fan in the handle? If so it is probably the same one as I had a few years back. I was quite underwhelmed by the airflow so I chopped the fan intake grills out as they are massively restricted, it made a notable difference👍🏻

[@GadgetUK164]

Yes, they aren't that good for larger chips! This IC was really too much for it without underheating, or low melting point solder. For the larger chips with this station, I would just use low melting point solder I think.

[@Neffers_UK]

You should patent the Flexibox™ Gadge :D A bit like "Fred "Thickie" Holden's tension sheet" - a Red Dwarf reference for those that don't know. Yo guys, please consider supporting GadgetUK via whatever mans you have available, be it simply watching the vid from beginning to end (that really helps), liking (or disliking, that also helps, despite being counter intuitive! - it's an interaction), subscribing or if you have the ability supporting via Patreon and Ko-Fi. He's a proper down to earth genuine guy, not some stupid influencer or anything, and his community is awesome.

[@GadgetUK164]

LOL =D And thanks for mentioning Patreon support!

[@muttBunch]

Please tell me there will be some signature poking with the small screw driver ❤️

[@haraldhimmel5687]

Damn I wish pcb explorer would exist for other systems too.

[@williamsquires3070]

This video brought to you courtesy of Blobby Solder, Inc.🤣

[@GadgetUK164]

Haha

[@williamsquires3070]

@@GadgetUK164 - Blobby Solder, Inc. is a division of Stikky Fluxx Int’l.

[@jasmynguo4823]

hello sir,I am really loving your personal style and enjoy following your journey on your KZbin channel so I am wondering if I have the opportunity to support you via offering you some products to create more content:)

[@TheMadmagik]

BUS exception error i think for BEER.

[@GadgetUK164]

That's correct, but BEER was a typo, it's supposed to be BER.

[@overdrive39]

IF i send you my Amiga 2000 can you repair it I know it would not be cheap to ship but I would like to have it up and running again. I live in the US

[@GadgetUK164]

I cannot offer customer repairs at the moment sorry!

[@overdrive39]

@@GadgetUK164 Very sad indeed. Thank you for your reply.

[@RetroMarkyRM]

LOL. where on earth did you MM go? :-)

[@GadgetUK164]

🤣

[@RetroMarkyRM]

First! :)