Color Isues after AV MOD on Atari 2600 JR Model NTSC

[CotoX]

Helo guys,

 

Im facing this problem on my Atari 2600 Jr NTSC board revision B.

 

After installation of the AV MOD following this procedure:

http://www.coolretroprojects.com/Atari_2600_AV_Mod_Installation_Guide.pdf

 

With the little circuit with 2 resistors and 1 Transistor from this site:

https://www.instructables.com/id/ATARI-2600-Video-Composite-mod/

 

I´ve follow the procedure step by step to AV mod on NTSC, I really don’t know if this is a capacitor related issue, and also if it is the problem, which capacitor I should replace.

 

It is not a PAL/NTSC cartridge issue, because the color was normal before the AV mod.

 

Here you can se the photos and screenshots.

 

all help is welcome

 

[+-^CrossBow^-]

Have you tried to adjust the color like is stated in the installation doc for the JR? It is the large flat wheel just to the lower right of the large filter capacitor on the left hand side of the system board.

 

BTW I would have attached the ground off pin 8 from the 4050 IC. This way the RF shielding can be put back on without a bulge of solder and wire preventing it from seating flush around the main ground plain.

Edited November 27, 2018 by -^Cro§Bow^-

[CotoX]

I´ve tried the flat wheel, but the fault continues.
I dont know if it´s a power regulator problem (7805) or a capacitor problem.
I will replace the power regulator as soon as I get a new one, but I dont know which capacitor should I replace.

[+-^CrossBow^-]

Try putting in R17 and C33 back in if you can and see if anything changes... Again the guide doesn't state they HAVE to be removed only that they remove them. I tend to test mods with as little removed as possible so it is easier to go back to stock condition if I need to.

Edited November 27, 2018 by -^Cro§Bow^-

[CotoX]

I no longer have the R17 and C33, i just need to get the original values from the components, then I will buy new ones when I go for the 7805.

But, from my understanding, only the red component was optional to remove from the guide, both capacitor and resistor must be removed.

I found a guy with similar problem, in his case was a cold solder joint on the voltage regulator:

 

 

 

 

Its not exactly the same issue, but I will try to replace it and see what happens.

 

What is difficult to me is to identify all the capacitor values, in order to replace it. If someone have this list, please feel welcome.

[CotoX]

I´ve founded also this kit, but since i´m in Brazil, it will be easier for me to get the items by here:

 

https://console5.com/store/atari-2600-total-refresh-kit-new-capacitors.html

 

What is still missed the value of the 4 green capacitor, the ones that looks like Chiclets.

[Keatah]

I so wanted to eat those when I was a kid!

[CotoX]

Guys, color problem solved after replacement of the 7805 power regulator, C26 and C20.
Now the image is a little bit blurred, but the color is fine.