Commodore 64 - PSU and capacitor testing - what to check before powering on your
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- Опубликовано: 8 авг 2024
- Our first video in a series of retro restorations. In this video we look at the Commodore 64 power supply - often referred to as the brick of death. And a few other things to test before plugging in your trusty old - or newly acquired C64.
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0:00 Intro
2:13 Testing without a load
8:07 Testing under load
10:47 Retest after 30mins under load
13:23 Looking inside a breadbin
16:49 Let's go!
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#c64 #c64psu #commodore64 
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Can't wait to go through mine. Just picked up two 1983 models from someone on Craigslist for free. Got a disk drive, cassette, monitor, two printers, a modem, and a bunch of manuals along with them.
6 years of trolling Craigslist paid off
Didn't you want to pay anything?
OK, just saw this suggested video from RUclips. Crazy to see a whole new look and different channel from what I am used to.
There's a how it started, how it's going meme in here
Thanks for this! Simple and easy to follow.
Thanks for the info
Great info thanks
Hi very informative video. I have a different case. I see you are using a resistor when testing the PSU under load. I ordered a new PSU which after some time get disconnected by the protection psu circuit due to overload current probably greater than 4A (declared by the vendor). What should be the value of the resistance seen by the psu ? I am reading 4.18 Kohm (multimeter set on 20K), no external device connected (joistick....ecc) between pin2 and 5. Thank you.
Great video. I'm gettin 10.60 AC and 5.16 DC. Without testing it with a load resistor would I be fairly safe at those readings you think to try out my c64 ?
You should be fine
I replaced all the caps on a Breadbin 64 I have and used some recycled heatsinks. I felt a bit sad to remove the original caps but I thought it was important. Even if they look ok they can be dried out after 40 years.
I have read enough tales of terror about the original c64 power supply to convince me that a new one is required.
I have the white block psu. I'm looking at getting a C64 Saver kit and just go with that. Have you seen these kits?
Hi Sawickipedia, 4 years ago my C64 was still working (without any problems).
Now I'm afraid to turn it on... Bcoz, I get 10.68v AC and 5.25v DC. Without testing it with a ceramic load resistor, is it safe to turn on my C64? TIA
Those voltages are fine, but who knows if everything else inside still works. Good luck
Black power supply on left is the best orginal one. Great. Not potted. I put a inline regulator board inside and left it otherwise original.
I'm a lay person. So do I need to get a resistor to test it under load? or is it good enough to just test the voltage at the pins? (I don't have a resistor so I'd have to find one)
Testing the voltage without a load will give you a rough idea of the condition. The voltage will drop under load but you won't be able to tell by how much.
As long as you make sure you're not getting anything higher than 5.2v unloaded you *should* be ok. If the system becomes unstable while powered on then chances are it's dropping too much voltage, but it shouldn't do any damage
i am getting 9.6V AC (and 5.16 DC) I noticed that the label on the device says 9V so is this an okay reading? ( in your video you say not good if below 10V so... was wondering)
9.6vac will be ok.
Forget checking them. Don't use any of these power supplies at all because they can fail at any time and fry your C64! All of them should be replaced with power supplies that fail in a safe way, period. If you have a C128 power supply, then you can use that with an adapter cable. A 1764 power supply would be fine, too. There are also a bunch of aftermarket power supplies that seem to work fine, and will shut down when they fail instead of blasting 8+ volts into the 5-volt input of the C64.
The unit says 9VAC. Why were we wanting within 10-11VAC?
When it's connected to the Commodore it will drop back down to around 9v
Im getting 5.12 on the dc but 0 on the ac. Ive aldready used it and it works, but after 10 min the screen starts to flicker.
Double check the AC again, it's the two top pins near the notch at the top of the plug. Make sure your multimeter is set to AC. There must be some voltage otherwise the C64 wouldn't work at all
@@Sawickipedia Yes i was on AC on thoose pins. Maby i touched the ground? Il check again. Btw i checked a c128 power supply on ebay but that ac was 9 volts?
Hi.. my power supply is 5V without load , but when I connect to the c64, it down to 1.7V (So, with load it fail) . How can i Repair the power suppy with that issue? Thanks!
Oh wow, it could be the power supply OR a short inside the C64. Do you have access to another power supply or C64 to rule out one or the other?
@@Sawickipedia i Check that after a couple of minutes the VIC turn too hot , others IC almost cold . I don't know if is normal that VIC turn hot in few minutes .?
The VIC will always be hotter than everything else, and yes they do get very hot. But in saying that, it is not powered from the 5V on the power supply. The VIC and SID get their power from the AC side that then gets regulated to 5V and 12V DC inside the C64.
@@Sawickipedia I remove the SID and c64 power on ok.. maybe it can be the SID itself or PLA ..
If it powers on ok without the SID, then it's most likely the cause. You will need to source a replacement. An original SID would be best, but failing that there is also the ARMSID which sounds very close to the real thing, and the swinSID which doesn't sound as good but it's better than nothing
hi, i have 5.23 V, its ok? :/
You should be fine for now but keep an eye on it.
is nice for the wedding of the goat. yes?