So first a bit of a disclaimer - I am a bit of a noob when it comes to electronics repair et all - my soldering is crap, and I am definitely learning this stuff as I go along - so please pardon what I am certain is going to be apparent ignorance.
I have a 2600 jr rev E which is displaying poor colors (screen appears mostly greyscalish/monochromatic with some yellow/green tinting on the sprites. I tried adjusting the color pot, which you can tell is affecting the underlying colors but onscreen the result is just changing the grey levels so the screen still remains mostly monochromatic. Adjusted the RF pot to no effect either.
Low hanging fruit (IE assumption on my part) seemed like it might be a bad cap, so I purchased a recap kit from console5 for the JR. Replaced the caps (polarity on the caps is correct)
Turned the machine back on, colors were perfect for 1 second, and then it reverted to the same symptoms, only this time with audio distortion as well.
Ordering ESR meter from amazon to check caps, but while I wait the two days for prime to deliver, I would love to get the communities input.
1) What should I be checking to troubleshoot this?
2) I have another 2600 jr that works (I haven't opened it yet so not sure what rev the board is) - so I could desolder and swap TIA if that's appropriate (my inclination is to socket the chips as well, my board has all three chips soldered to board - so if there is room, I think I will socket them)
3) This is probably a really dumb question - but I am curious all the same, the Jr cap kits comes with new caps for C20, C26, C27, C29, C37
- c26 is obviosuly the big cap @ 2200uF 16v
- the other four c20, c27, c29, c37 are listed @ 4.7uF 35v in the console5 wiki (https://console5.com/wiki/Atari_2600)
- That said the kit from console5 only comes with 3 replacement caps instead of four.
- My particular revision lacks c29 so 3 caps were fine, but are there revisions which have all four caps on them? Or does each board revision have only a combination of three of those four caps?