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ColecoVision thick vertical lines issue

8 replies to this topic

#1 Dr.Buddha OFFLINE  


    Combat Commando

  • 2 posts

Posted Fri Mar 2, 2018 4:33 PM

Hi guys. I'm having an issue with a ColecoVision I just got. I've looked through the forum for a similar issue, but it doesn't look like the super thin vertical line issue that comes from a bad on switch, and I've tried 2 different power supplies with no change so thats also unlikely. Ideas?


#2 Dr.Buddha OFFLINE  


    Combat Commando

  • Topic Starter
  • 2 posts

Posted Mon Mar 5, 2018 3:40 PM

no one?...

#3 Vectorman OFFLINE  


    Chopper Commander

  • 246 posts

Posted Tue Mar 6, 2018 10:18 AM


#4 digress ONLINE  



  • 1,104 posts
  • Location:Toronto, Ontario, Canada

Posted Tue Mar 6, 2018 10:46 AM

1. Try a different power supply if you have one.

2. try leaving it warm up for a while see if that helps. It help with my system

3. It could be your video ram going bad so you could buy a kit and replace the vram or get an f18a upgrade board

4; it could be your power switch - you could disassmble and clean it up or as some of us have doen replace it witha rocker switch. This was a good solution for me.


System is work other wise? check to see if your joysticks are working in games as well.


no one?...

#5 4300 OFFLINE  


    Chopper Commander

  • 160 posts

Posted Mon Mar 12, 2018 9:05 AM

Give cleaning the switch a shot. That's exactly what mine looked like prior to cleaning.

#6 orrko8791 OFFLINE  


    Space Invader

  • 31 posts

Posted Thu May 17, 2018 1:18 PM

In Your Rf Modulator There Are 2 Adjustment Screws; (1) For Sound / (1) For Picture,There Is A Third Screw But It Is Not A Function It Is Only A Fastener.Due To Age Of These Consoles,They Sometimes Need Adjusted,It Is Important To Remember These Systems Can Sometimes Be Fixed With "Small Work" Adjustments And Basic Principles,We Do Not Always Want To Perform Overwork Where It Is Not Needed,Therefore Examine All Basic Principles Of The System,Power Supply,Possible Adjustments Available,Overlooked Cables,Connections Etc.

Also A Cartridge Exchange In The System,(Clean Cartridge)

Hope This Helps

#7 orrko8791 OFFLINE  


    Space Invader

  • 31 posts

Posted Mon Jun 18, 2018 1:53 PM

Here Is A Picture Of The RF Modulator Adjustments

Attached Thumbnails

  • Colecovision-RF-Alignment-Map-768x612.jpg

Edited by orrko8791, Mon Jun 18, 2018 1:54 PM.

#8 rodge2001 OFFLINE  


    Star Raider

  • 95 posts

Posted Wed Jun 20, 2018 4:53 PM

Can any damage be done by overturning these?  I'd be afraid to do so especially with power on and all that exposed unless safe to do so as far as getting shocked and damage to console.  Might either of these adjustments help regarding RF signal quality? 

#9 orrko8791 OFFLINE  


    Space Invader

  • 31 posts

Posted Thu Jun 21, 2018 12:05 PM

Always Unplug Console No Power When Working On Any Console

These Results Will Vary,Possibly Help Or Not Help At All,However Worth While To Narrow Down Source Of Issue

Keep Power "OFF","UNPLUG CONSOLE" Adjust By Trial (Adjust Then Power On Console) Power Off Console To Readjust-Then Power Back On

Turn These Just Slightly For Results

RF Quality Would Be Based On How Well System Is Tuned In,These Are Basic Adjustments And Keep In Mind All These Systems Are Old and RF Modulators Sometimes Need Re-Built,Although This Would Be A Good Starting Point To See What Response Your System Will Have

Channel B Adjustment Is For The "Picture" Perhaps This May Give Better Quality Depending On Current Issues,If These Adjustments Do Not Prove To Help,Then At Least It Can Be Considered A Process Of Elimination. Rather Than Do Un-Neccessary Work Elsewhere On The System.

Remember "POWER OFF" Never Take Chances,Safety First When Working On These Consoles.

Edited by orrko8791, Thu Jun 21, 2018 12:22 PM.

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