TimTheKoala

Yo guys, I'm having problems with a colecovision i found in my grandads garage that used to belong to my uncle. The unit used to work absolutely fine till the day he put it away. Ive already done some troubleshooting with it, I've actually replaced the power switch and ive tested the voltages from the power supply and all seems to be fine but no matter what i do, i can't get it to work properly. It keeps displaying garbled graphics and wont load games properly. Sometimes it shows the coleco load screen with game name but all the letters are screwed and may sometimes also go to the blue selection screen but wont do anything. I really wanna fix this thing in time for my uncles birthday for early next year as he has fond memories of it as a child. Here is a video i posted on youtube of the problems I'm having:

I dont have a smaller game like that unfortunately.

I think its the tms4764nl rom chip. I tried probing that chip and i managed to progress through some game screens and the solder points of that chip look burnt to a crisp. Does anybody know where i may be able to get the tms4764nl chip? Or does anybody have one spare?

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I think i just found the problem, my uncle probs tried to mod it! i can see some extra capacitors and resistors poorly soldered onto one of the chips!

I just tried it and it didn't work, thanks though!

Thank you a lot for the website with the pdf's! i think i need a new chip.

It was supposed to work back in the day before it was put away, and the display only goes full retard when a cart is inserted. do i really need to use alcohol? could i use mentholated spirits? i rubbed the carts down with a cloth and used a tooth brush to clean the cart port on the console.

The image on the box is a little misleading don't ya think?

I need some help with this ASAP i only have a month to get it going!!!

Hi all, I've come to this forum because i have had no luck elsewhere regarding my problem. I acquired the console from my granddads place, it was in a cupboard hidden away in the garage. and it needed a bit of work to get it going again such as a new Internal RF cable (because its the PAL version). its now working............well kinda. When i start it up without a cart it displays the logo and text perfectly. The problem with my Colecovision is when i insert a cartridge to play some classic video game goodness the console freaks out! some carts screw the console up as soon as i turn the thing on, and the others come up with the player select screen but they screw up after that! The game Smurf turns my tv into a Rainbow machine while turbo just keeps resetting the console. some other games come up with the player select screen but won't respond to any button. i tried spraying WD40 into the power switch and it has made the switch click again but it seems to have done nothing! I also tested the power supply with the console on and off with a multimeter and it displays the proper -5v, +5v, +12v and ground even at the switch pins! I really wanna get this thing working again as it was my uncles and i wanna fix it up for him for xmas.