Niki

So, I have a colecovision that has been giving me nothing but problems one after the other. I found out that my power brick has gone out and since I have a lot of spare capacitors/resistors/regulators, etc. I actually would prefer to attempt to fix it first before tracking down a new one and also to be able to have the experience of fixing it. The situation was that one day, it just wouldn't turn on, I would just get static that would get better or worse as I adjusted the power connection. So, I took out my voltage meter and found that on the 12V pin, I was only getting 2.35 Volts, all other pins were fine. So, I cracked the thing open with intent to change out the 12 V regulator. As I was testing it to see which one of the regulators was acting up, I found that for whatever reason, the readings I would get from the 12V regulator were inconsistent. Sometimes, I would get 2V, other times, it would read properly at 12V and other times, it would just jump around. So, I just decided to change out the regulator anyway and now, it's consistently reading 17V, so I bet something else is messing up in there or that I got a faulty part (It was bought way too long ago to return the part but it was new, as in I didn't scrap it from another unit.) I currently just put it away as I was frustrated with it. I probably will be able to figure it out after a while, but if anyone can point me in the right direction to save me some time, that would be very much appreciated. As I stated in the last post about the same colecovision, I have some basic electronics knowledge but not a lot. Kind of learning as I go here.

Thank you so much for all of your help! I'll order the part right away.

Thank you for the response. I attempted to use some small headphones on pin 7 and I did not get anything. The Logic tester goes active to high on both pin 5 and 6, Pin 14 goes to low. So, does that mean the the chip is bad or are there other things I should check first before ordering parts?

I have a Colecovision with a no sound problem. The video is perfect, it just doesn't have any sound. Occasionally, I will get a buzzing static-y sound, not with any particular game. I have tested it on multiple TVs all of which work with my friend's colecovision and I have verified that all my cables work. One odd thing is that I have the expansion module to play Atari games on it and the sound works perfectly on the Atari games I put in there. (Not sure if the expansion module has it's own sound chip...?) My first instinct is that it is the sound chip, SN76489AN, but I would like additional feedback from anyone who might have more experience with this kind of issue before tracking down obsolete parts from china that I may not need. I have soldering/desoldering experience and some general electronics knowledge, but not a whole lot. Any help would be greatly appreciated. Thank you.