Jump to content
Sign in to follow this  
Ianr757

Colecovision Black Screen and Hum

Recommended Posts

I just got in a nonworking Colecovision that I thought I'd try and repair. Upon initial inspection, the console would power on, but the screen was black and there was a hum/sustained beeping noise every other power cycle. I tried the Atari expansion module and it worked fine, so I thought it was going to be either the RAM, VDP or both. Well, after replacing all RAM ICs using the 5v memory mod, and the VDP with a spare, it still has not improved. Any ideas of where to go next? Thanks!

Share this post


Link to post
Share on other sites

You check the cpu?  Normally I would say power supply first but I assume you've checked that already.

 

Black screen with a tone is either going to be your cpu and or the vdp most of the time.  

Share this post


Link to post
Share on other sites
8 minutes ago, Ruggers Customs said:

You check the cpu?  Normally I would say power supply first but I assume you've checked that already.

 

Black screen with a tone is either going to be your cpu and or the vdp most of the time.  

Aha, I was leaning towards the Z80, just didn't know if it would make a difference since the expansion module works. Thanks for the tip! And yes, the power supply is just fine, so it must be the Z80. I'll swap it out and report back.

Share this post


Link to post
Share on other sites

@Ruggers Customs Success, it's alive! Turns out the original VDP was fine, just the Z80 and maybe the RAM (which was going to be modified anyway). Thanks so much for the help!

  • Like 1

Share this post


Link to post
Share on other sites
22 minutes ago, Ianr757 said:

@Ruggers Customs Success, it's alive! Turns out the original VDP was fine, just the Z80 and maybe the RAM (which was going to be modified anyway). Thanks so much for the help!

Awesome, good job! :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...