Denial

Hi, It is the 2 prong version. The trimmer tweaking you are explaining as alteady been done (There are 2 plastic round trimmer one for video and one for black I believe) as I wasn't happy with the picture output. Anyway this strange artifact is still coming out from time to time. Maybe I need to tri...

Hi, I have a strange video artifact popping out randomly at power up for one Vic20. Sometimes VIC prompt will look like this https://s16.postimg.org/54k73dgc1/IMG_4907.jpg A rapid recycling of the power switch will put back video to normal. https://s16.postimg.org/mvvthtvqp/IMG_4908.jpg Any idea? :?...

Hi Eslapion, Thanks a lot for your proposal :) , I will bookmark you and revert once I know what's wrong with the VIC. :wink: So made some testing as suggested : at the PIN 40 of the CPU (6501) there are 5 volts as requested. Tested also the PIN 40 of the 6561 and also 5 volts. Both get hot more tha...

Any good address where to buy Vic IC's not too expensive ?

OK so first test. I have switched on and let it running for about 10 mins. Still no video and noticed that the vic chip runs pretty hot together with the CPU.

Hi mrr19121970 I have read about issues concerning a very long booting time. I have never left the Vic20 powered on for a longer period than a few seconds so I will also try this and check the capacitor. Strangely the last time I used the Vic20 almost 6 years ago it was working flawlessly. Then I sh...

So I will start by checking 6502 condition. How much should be the input voltage at pin 40?

Hi, I have a spare vic20 with me but all IC's are also socketted on this one. I would like anyway to try fixing the other one and keep it as a spare. It will be more and more difficult to find those machines working in the future ;-). Only think I can do is to definitely unsolder suspicious IC's and...

Hi, Thanks for the guide :-) I confirm it's a NO screen at all. There is no video signal input going to the LCD screen which is displaying a "no signal" message. Also the cassette player is dead but with a black screen it should normally spin according to the guide so this could be as you ...

Hi,

Thanks for the first tip, I will do and revert then

Hi to all, yes, unfortunately I am another lucky owner of a "black screen" vic 20 :cry: After many years having this baby shelved I decided to power it up again and here we go. -There is NO video signal at all (no black screen just no switch to video on the lcd screen). the video to Scart ...