It seems strange that I didn't adjust the default TV settings for the coax input. Most of the other games I own have a discernible image. My Atari 2600 is even more clear and bright on the same input. Nonetheless, I still feel silly that I didn't try it.
I increased the brightness from 50 to 80 and now the image is good. Hnh, I didn't know the bases in Space Invaders have a shifting rainbow pattern. Neat.
I still think there is something weak about the output given the 2600 looks great at the default settings.
Could this brighten the picture? What does it actually do to the components? Does it cause some component to draw more current?
I know I may be stepping ahead, but could replacing the voltage regulators improve the picture? In my search for info to help with the repair, I found this video where the voltage regulators and their heatsink are removed and replaced: https://www.youtube....h?v=2rSlqt_VmjY
I only ask since I remember reading something about a faulty NES voltage regulator (same type used in the 5200) causing some similar problems.
Yes the bases are subtlety animated. It’s kinda cool.
Adjusting that potentiometer adds or decreases the color delay in the burst signal. It won’t harm any components. If it’s been tweaked, a darker an image could result. It’s an adjustment, specifically built in for color correction. Simple enough to check. Use your fingers.
There’s nothing wrong with your voltage regulators as they are. If your system powers up (which it obviously does) there is no fault here. The 7805s and the MJE220s are doing their jobs, and they would have zero impact on color reproduction. This is a go / no go condition. They work or they don’t.
Try some other games that don’t have such a dark background, like Dig Dug or Moon Patrol etc. to see if they are more vibrant than the dark background in Space Invaders.
Also, what does the system look like on a different Television? Same “dark/dim” problem? If this condition doesn’t travel to another TV, you can rule out the console
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Edited by atari-dna, Fri Jun 15, 2018 6:29 PM.