VIDEO Problem with VIC-20 NTSC

[Sid1968]

Hello,
i have a problem with my "new" VIC-20 NTSC. I use it in germany with a standard german powersupply. Same that i use with VIC-20 PAL.

OK. This is what i got:

Original VIC-20

01.jpg (451.25 KiB) Viewed 2479 times

Now i changed the electrolytic Capacitors and added the S-Video Mod.

The Board with new electrolytic Capacitors and S-Video Mod.

02.jpg (460.25 KiB) Viewed 2479 times

S-Video MOD works, but the Video error is the same:

Video-Output with new electrolytic Capacitors and S-Video Mod.

03.jpg (246.64 KiB) Viewed 2479 times

Any idea what is wrong with my VIC-20?

[Kweepa]

Interesting. It looks like stripes of the same character are randomly written into screen memory.
Doesn't seem like a video error...?

[Imperious]

Looks like a faulty Character Rom to me.

From Ray Carlsen's repair info

UD7 901460-03 ROM CHARACTER
Startup screen characters missing (just blocks or flashing lines where
characters should be) and alphanumerics missing from games. Game carts that
use mostly graphics characters may look normal while running

[Sid1968]

I solved the problem. If you are interested look on our webside. Its writen in german.

http://orecc.dd-dns.de:8088/mybb/showthread.php?tid=1

[joshuadenmark]

I solved the problem. If you are interested look on our webside. Its writen in german.

http://web265.tribus.ns-wn.de/phpBB3/vi ... 0&p=93#p93

I've had german in school super guide and pictures, huge thanks for taking the time sharing this.

[Sid1968]

Thx.

Maybe the nongerman folks can use http://translate.google.com

[metalfoot76]

So just a cold solder joint? That's not too bad a fix then.

[Sid1968]

I bought this one and another one (That have the SHIFT-LOCK Problem - read in this forum) for together 60 EUR.

The seller told me that both "VIC-20 NTSC made in USA" were never in use! They really look like they are completly new!!!
But the long storage time may result in that problem. My other VIC-20 had problems too, that resulted in a keyboard problem. I could fix that,
but the "SHIFT-LOCK Problem" is not solved at all.