Can anyone tell me what's going on here? I bought this Vic a while ago and it has random characters disappearing/flickering on the screen. Seems to get worse as is warms up. It's a UK PAL machine with only one adjuster next to the graphics chip which doesnt seem to have any effect on this issue.
Odd fault, dissapearing text!
Moderator: Moderators
-
- Vic 20 Newbie
- Posts: 4
- Joined: Mon Jun 12, 2017 2:14 pm
- Website: http://www.goforlaunch.co.uk
- Location: Plymouth
- mrr19121970
- Vic 20 Nerd
- Posts: 873
- Joined: Tue Jan 19, 2016 9:22 am
- Location: Germany
- Occupation: IT service manager
Re: Odd fault, dissapearing text!
Looks like 6560 or more likely the char rom. The R has the same defect in both places.
-
- Vic 20 Newbie
- Posts: 4
- Joined: Mon Jun 12, 2017 2:14 pm
- Website: http://www.goforlaunch.co.uk
- Location: Plymouth
Re: Odd fault, dissapearing text!
Yes, the defects are consistent with each character. Is there any way to fix it? Or is this Vic just trash now? All the chips except for the graphics chip are soldered.
- mrr19121970
- Vic 20 Nerd
- Posts: 873
- Joined: Tue Jan 19, 2016 9:22 am
- Location: Germany
- Occupation: IT service manager
Re: Odd fault, dissapearing text!
You can fix it for sure. Desolder the chip, pop in a socket and then a new CHAR ROM.
The problem is that you can't burn the CHARROM, you need an old replacement or an expensive NOS
http://www.ebay.de/itm/182592247956
The problem is that you can't burn the CHARROM, you need an old replacement or an expensive NOS
http://www.ebay.de/itm/182592247956
Re: Odd fault, dissapearing text!
if you want consider this:
http://sleepingelephant.com/ipw-web/bul ... f=3&t=7933
http://sleepingelephant.com/ipw-web/bul ... f=3&t=7933
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." (Albert Einstein)
Re: Odd fault, dissapearing text!
Do you have any cartridge games that all graphics? Running something that doesn't need the character ROM would help determine if it's that or the VIC (or RAM)
-
- Vic 20 Newbie
- Posts: 4
- Joined: Mon Jun 12, 2017 2:14 pm
- Website: http://www.goforlaunch.co.uk
- Location: Plymouth
Re: Odd fault, dissapearing text!
Just tested with 2 carts, definitely looks like it's connected to the character rom. Below are shots of Omega Race (graphics) and Adventureland (text), difference is clear. The text fades and shimmers and seems to get worse gradually.
Re: Odd fault, dissapearing text!
I think that pretty clearly indicates it is the character ROM. If you say it gets worse as the system heats up you could try spraying some freezer spray but I'd be looking to replace it if were mine. Is it socketed?
Re: Odd fault, dissapearing text!
See this thread about an adapter for a 2732.mrr19121970 wrote:You can fix it for sure. Desolder the chip, pop in a socket and then a new CHAR ROM.
The problem is that you can't burn the CHARROM, you need an old replacement or an expensive NOS
http://www.ebay.de/itm/182592247956
http://sleepingelephant.com/ipw-web/bul ... php?t=7058
“In religion and politics people’s beliefs and convictions are in almost every case gotten at second-hand, and without examination... whose opinions about them were not worth a brass farthing.”
-Autobiography of Mark Twain
-Autobiography of Mark Twain