The hardest (yet most satisfying) C64 repair I've ever done
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- čas přidán 27. 06. 2024
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C64 NORAMCHECK diagnostic: rasterirq.com/2022/04/c64-dia...
Kinzi Dead Test and Check64: www.forum64.de/index.php?thre...
C64 Keyboard test: csdb.dk/release/?id=98411
SID test: hackjunk.com/2017/11/07/commo...
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0:00 Intro
1:07 On the inside
5:10 First power on
6:35 Finding faults without removing anything
12:53 Checking socketed chips
15:20 Isolating suspect chips
24:01 Back to one flash?
26:29 How to chase your tail
30:23 Color RAM bad?
32:49 Not color RAM?
36:13 Not done yet
41:01 Port and keyboard tests
42:55 SID full test
45:21 SID results
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Thanks for watching! - Věda a technologie
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I have just finished watching the video in its entirety. I just want to thank you for the HUGE work you put into editing it and to clarify all the moments. I learned a lot from it.
Maybe someone's power supply brick failed and fried all those chips at once?
Definitely plausible
What a rollercoaster ride
Wow! What a lot of faulty chips. What is amazing is that the SID survived since the 6581 is so prone to failure. Nice Work!
Great work in repairing this c64! SiD sound drunk at 46:00 😁
I just started watching and I suspect after seeing the oscilloscope activity that you have a short between data line 7 and some other line on the system. Probably happened under one of those sockets when whoever owned this machine installed those sockets. I'm very curious to see what is the actual problem 😊
Ah I was so wrong! That was a ton of bad chips, wow!!!
"What the F....". Love it..
It's a haunted C64!!!
This is why we need chip replacement projects like ARMSID or Kawari.
What a journey!
ooh... a missing ground will or course be the cause of a total random behavior!
I'm not surprised the ROMs failed with how poorly the system seems to have been treated. They are easily damaged if treated poorly. The PLA looks like it was already replaced with a more recent one so I expected that to work. The pin replacement on the 8701 clock IC looked dodgy, but the fact you had video means it likely was working. The other ICs being bad in weird ways was quite unexpected, but it seems like this system has been through the ringer... or washer and back?
Fun to watch, but I'm sure it was quite the session of debugging.
Nice, a disaster which managed to kill 2 CIA's, ROM IC's but the SID and the PLA survives, that's a first for me. And a quick question, what id that transistor looking mod on the ArmSID?
It's a 3.3V regulator, I managed to kill the original one on the armsid putting it in a pla socket.
Back to the past🔥
I appreciate that you thoroughly explained your troubleshooting mental process
Great work and result!
"ground, ground, that's not ground" would make for a good tshirt.
Very good fault diagnosis! Thank you for the very good insight into how far a repair really can go!
That is one cursed C=64.
Great video! What a conglomeration of faulty chips. Great job troubleshooting along the way. I'm pretty sure I don't want to know how much time you invested in that board. :D
an actual useful testing mode for a test cart would actually be just toggling a selected address line every 500ms, same for a selected data line, so that you could "relaxedly" check the logic levels for each line with a oscilloscope...
Maybe that would only be possible with some sort of test module that replaces the 6502...
That would be nice, but yeah not sure if it's possible. You'd probably need to get the VIC-II to "agree" to such a thing
Great video mate. Tons of dead chips.
Wow, a rev 425 board that doesn't have all the big IC's socketed from factory that's different. I thought commodore only went back to soldiering the IC's with the rev 466 they made after the 425 as a cost reduced long board model.
The character ROM is not completely bad, it has a single bad bit.
Would Evapo-Rust do the job for this sort of thing? Derust and then wash? Seems like a better choice than a contact cleaner.
"Hardest, yet most satisfying..." > Don't say it, don't say it, don't say it...!!!!.
Hello is this the 8bit guy?
😢😴🍪
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czcams.com/video/6D5lEtKFC-M/video.html Sounds like one of Kraftwerk's earlier, more challenging albums.
1rd