Dead Commodore 64 with multiple faults repair - Shorted 9V, faulty video, strange keyboard input

Рет қаралды 4,436

2 жыл бұрын

An old and dirty Commodore 64 that was dead. No video, and a short on the motherboard.
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It turned out to have at least four different faults, and it took some time.
Can it be fixed ?
Part 1 of 2.
Part 2: • Dead Commodore 64 with...
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Пікірлер: 36

@tommyvanpelt2408 2 жыл бұрын

This is a far more valuable video than opposed to others where they go straight to the problems without any logical reasoning as to how to get there. Thank you! Also, greetings from Florida!

@Arcticretro 2 жыл бұрын

Thanks a lot. I've been to Miami. Great state !

@Doug_in_NC 2 жыл бұрын

I will second that. I much prefer repair videos with all of the wrong turns and mis-diagnoses than ones with just the correct solution. They are both more entertaining and more helpful.

@patkelley8293 Жыл бұрын

It's like you have one repair video to cover everything that can go wrong. I've learned a lot!

@Arcticretro Жыл бұрын

Thanks!

@HAGSLAB 2 жыл бұрын

Nice troubleshooting, looking forward to next video! :)

@Arcticretro 2 жыл бұрын

Thanks 👍 Coming tomorrow :)

@itrema Жыл бұрын

excellent work ! 20:55 i also faced to a screw that shorted a transistor. I isolated the metal plate of transistor from dissipator ( = ground ) and machine came back to life. I never understood why

@Arcticretro Жыл бұрын

Thanks :)

@force4200 2 жыл бұрын

Always so nice to watch have a nice weekend:)

@Arcticretro 2 жыл бұрын

Thank you! You too!

@roelandriemens 2 жыл бұрын

You might also check the zener diode near Q1, when Q1 was shorted between collector and base, it could be blown also.

@Arcticretro 2 жыл бұрын

Thanks. I tested it-it was good

@eddielegs344 2 жыл бұрын

Had to laugh again about you especially when you came with that Leister Fohn hahahA Worked 24 years with soon device was plastic welder. They are of good quality if you treat them well. What my colleagues sometimes did not do then they break down is a fragile heat spring in it. It is important that before you turn it off you put it on cold (turned) first let cold air go through and then after 5 minutes. Then turn it off. ! Looks like it's an old one to you. But with this method they last a long time. The spring is more expensive than the device. Also be careful with bumping or falling when it is hot and even more when it is cold. I had one in private once but it was confiscated during a drugs raid at a friend of mine's house and so were my belongings, including the Leister hairdryer. I had nothing to do with the drugs by the way. Hey but what a tough c64 this one would go crazy. What a disaster. But you're not giving up. Nooo, because there will be another part. 😅 🎉

@Arcticretro 2 жыл бұрын

We'll see :)

@TotallyAqua 2 жыл бұрын

Nice Storytelling. Keen to see if you can fix the board in part 2.

@Arcticretro 2 жыл бұрын

Next friday :)

@salvocristaldi1689 2 жыл бұрын

Waiting the second part to know the mistery ^_^

@Arcticretro 2 жыл бұрын

Working on it now.

@congestiontv Жыл бұрын

The case of this old breadbin looks as brown as my every day use one. Luckily mine is working just fine.

@coryengel 2 жыл бұрын

As you noted, moving Joystick 1 sends characters to the screen. Paddle controller signals are processed by the SID chip. Since the SID is performing poorly and characters are being sent to the screen, this could be at least partially a SID problem.

@Arcticretro 2 жыл бұрын

Thanks for the tips!

@claudioquintanilla1471 2 жыл бұрын

I would say 90% of those failures are false contact, rapidly you should suspect for IC socket base, just replaced it with round pin gold contact, putting a wire as a bridge wasn't too elegant, besides that light green socket already has bad contact issues... so soon or later more problems will come... another advice when you need extract a DIP IC first use a solder pump extractor (as you did) and then apply heat air gun noose over the entire body IC not only pins... because you will burn PCB as you did...

@minombredepila1580 2 жыл бұрын

It may be a short. Please notice that the two clocks in the tester screen do not match. Guess something is shorting one (or more) CIA pin(s)

@stevejakobsen2765 2 жыл бұрын

If you are dealing with alot of shorts on theese boards you might find a milliohm meter usefull. You simply meassure resistance to ground. The closer you are to the culprit the lower the resistance..

@Arcticretro 2 жыл бұрын

Thanks for the tips!

@Doug_in_NC 2 жыл бұрын

Wow, a 1540 drive! Those are pretty unusual, especially with the original ROM that isn’t compatible with the C64. As it’s next to a C64, I’m guessing it’s an upgraded one, right?

@Arcticretro 2 жыл бұрын

You will see it in tomorrows video :)