omgaz

I had nearly the same garbled graphics. installed the 5v memory and now it works.. Thanks!

For future generations.... After reading some more guides online I ended up connecting the leg of C43 to the right leg of L3, worked fine. This fixed my garbled graphics

Hi, I am trying to install the 5v memory in my rev C colecovision. The motherboard is a bit different than the guides posted online. The guides online have you connecting the middle capacitor to the right leg of L3. My board already has a trace connecting the two. The right capacitor (C43) is showing 5V. Do i simply connect the leg of C43 to the right leg of L3?. Pin 9 of the memory chips already has 5v going to it, i assume this is ok to leave? any insight would be great. Thanks!

I bought a logic probe and it appears the memory is OK. Is there a way to test the 9928 chip with a logic probe? Because I a can't seem to find any help/documentation on the internets i am going to replace the 9928 chip. If that doesnt work i guess it'll go in the closet for another 10 years.

Hmmm well thats not what i was hoping to hear. Is there any way to narrow it down further as to what the problem is? I am not that skilled at soldering, however I have replaced 40 pin ICs before with success and this one looks no different. Is there a way to test the VDP?

I have a CV that I have been meaning to fix for a long time -- and its finally time. It has always had the garbled screen on boot. If I put a cart in, it does appear to play the game(audio and movement on screen), however I cannot make anything out. The power supply has the correct voltages. I disassembled the power switch, cleaned and greased it and no change. I suspect the video ram is on its way out. I was probing around with a multimeter and when I check for resistance on pin 11 of the bottom right memory chip, the missing letters in colecovision appear and almost everything else goes out on the screen. Because of this I think I am going to replace them all with the 4161 chips and sockets. Are these the correct chips? eBay Auction -- Item Number: 180613081623 Does it sound like i'm on the right path to getting this fixed? pic of boot screen