Commodore 64 Repair Dead Screen- No Video Repair

Рет қаралды 3,624

Күн бұрын

Power up - not even a glitch on the screen - I post a lot of these with different issues so it may help anyone troubleshoot their C64 and bring their system back from the dead :)

Пікірлер: 31

@JamesBricker-lq3nu Жыл бұрын

Rule 1 in troubleshooting is always check your power supply and regulators FIRST. I like these videos of yours. Please keep them coming. Thanks

@revivingretro Жыл бұрын

Though they would have shown good in this case, you are absolutely right. It is best practice to do that. Even the diagnostic manual has you do that first. :) Thank you for being a good voice of reason here :)

@doctorsocrates4413 5 ай бұрын

I love these old commodore computers.People think i'm weird because i still use them but they were a huge part of my childhood.i have the c64c ..Thanks for the video and best wishes.

@atarimex2643 2 жыл бұрын

Before powering on, one should remove all socketed chips and checking 5v and 12V rails. Then is best to do testing without the sid, roms And cia’s chips with the dead cartridge. Just a suggestion

@revivingretro 2 жыл бұрын

Thanks for the suggestion. I think I've pointed out in several of my past videos that I usually take out the SID since that is most sensitive, but I may not always go through all the motions in the interest of time. But still, everyone will have their way of doing things. Keep in mind also I make these videos to show symptoms and ultimately the fix so folks can hopefully have fun fixing their own systems if they are so inclined. In the interest of time though, I do cut corners. I don't think I have a single video where I've used my scope which would just suck up more time :) For the purpose of these videos and time, I do make assumptions - i.e., since non-working systems I receive have already been turned on before I get them, me turning them on as received won't typically cause any more damage than what's already been done or if there's a signal - your odds are quite good the rails have power. I appreciate the input anyone posts though so others might get more suggestions in helping them do things their own way as well :) Here are some pictures of just a couple of my computer rooms - every one of them restored and working :) I think I have a few systems under my belt ;) drive.google.com/drive/folders/1f0OZgfmCMk52T-gul5e2nUzOYr4GEsQK?usp=sharing

@atarimex2643 2 жыл бұрын

@@revivingretro ok, man. No problema. Just thought to mention it since It appeared a VIC was cremated during troubleshooting on your video. Good luck to you!

@revivingretro 2 жыл бұрын

I promise, no chips were harmed in the making of this video :) :)

@madeinjapan3485 Жыл бұрын

Hi, great video where did you get the chip extraction tool? Plan on socketing most of my chips, what size chip sockets will I need for the various chips that are soldered in.

@revivingretro Жыл бұрын

Ebay for the chip extractor - or you could go to Mouser or Digi-key for a new one. As far as sockets go - it depends on the board. Different board have different numbers. You'd just have to count the chips/pins on your board. Typical long boards will have something like: IC Sockets 40 pin - (4) 28 Pin - 2 (wide) 24 Pin - 3 (wide) 20 Pin - (1) 18 Pin - (1) 16 Pin - (4) 14 Pin - (5)

@ariel85 11 ай бұрын

Great video! I own the exact same model of a C64 that you are showing in here. Quick question, what is that "Chip Tester" that you are using in there? Where do I get it?

@revivingretro 11 ай бұрын

Backbit Chip Tester (store.backbit.io/product/chip-tester/)

@madeinjapan3485 Жыл бұрын

If my psu is reading outside the testing parameters of the voltage requirements (high) would it just blow the fuse first protecting the motherboard chips like the vic,pla or ram chips or cause further problems as in this case.

@revivingretro Жыл бұрын

The fuse does not protect your 5v rail which is what the chips are using. If you are outside the 5v parameters, you will start frying chips. Most voltage protectors trigger at around 5.3-5.4v

@caswick1014 Жыл бұрын

Hi, im new to the wonderful world of C64 repair. I bought a C64 with this exact same motherboard layout as the one you are working on circa 1982. Was wondering - what make/model is the chip tester you are using? Trying to find one on Amazon ATM and cant seem to - might be searching for it under the wrong name. (using Computer chip tester) Thank you for the video - it was very informative!

@revivingretro Жыл бұрын

You can Google Backbit Chip Tester. It's not available on Amazon :)

@Chris_Longstreet 8 ай бұрын

Just confirming - you used a 3 amp fuse, correct? I couldn’t find 1.5 at the store which is what I currently have in mine, but found 3s

@revivingretro 8 ай бұрын

It's a 3AG 1.5A fast-blow fuse - you should be able to pick them up on Ebay or Amazon inexpensively if your local store doesn't carry them. A 3 amp fuse may be a little too high if you really had a problem on the 9v rail. I mean it would work, but if you had a problem on the 9v rail and your fuse didn't blow fast enough you may damage a CIA chip since the 9v ac generates the 60Hz/50Hz signal needed for the real time clock built into the CIA chip. The 9v also regulates at 12vdc which among other things is used to power the SID. So that could get damaged as well. It's rare I've ever encountered the fuse blown on the well over 100 systems I've repaired and if all you had was a 3 amp, you may get away with it unless there was something seriously going on with the board or power supply. But at least now you know what could be effected if that were the case :)

@tudra6961 Жыл бұрын

Hello There! What IC tester do you use to check the ICs? Thanks!

@revivingretro Жыл бұрын

BackBit Pro

@tudra6961 Жыл бұрын

@@revivingretro Thank you!

@revivingretro Жыл бұрын

@@tudra6961 Yes - that is the BackBit tester: store.backbit.io/product/chip-tester/

@dannous 10 ай бұрын

17 minutes video and it was the fuse?!!!!

@revivingretro 10 ай бұрын

I know... but these videos are more about the troubleshooting - and of course here the lesson learned - check the simple things first :)

@birdman8649 2 жыл бұрын

Looks like you placed SID in tester one pin too low at 5:19 because I see two empty slots on top of the chip. Hopefully that didn't damage the chip and hopefully you tested that SID properly later. Was that replacement VIC-II already bad before adding it on this board?

@revivingretro 2 жыл бұрын

Nice catch on the pin mismatch!! Good eyes (mine are going with age!) - that wouldn't have fried the chip - the 5v to the chip is on the top right socket which was empty so chip would have no voltage going to it. The issue with the VIC-II turned out to be oxidation on the pins. I put all these chips I test bad in a box and test them all at once on a C64 loaded with zif sockets (never hurts to triple check - I believe that is your valid point). The SID was definitely bad. The VIC-II actually ended up testing fine after I cleaned the pins. I know I leave a lot of superfulous stuff out of these videos (they get so long and I tend to ramble) so hopefully these constructive comments provide more insight. Really appreciate you keeping me honest! :)