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retroborg

Member Since 1 Oct 2013
OFFLINE Last Active Dec 31 2014 5:50 AM

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Atari 2600 4-Switch NTSC RCA displays Black & White on EURO TV

Sun Dec 28, 2014 12:55 AM

Good day!

I have an Atari 2600 4-Switch Darth Vader NTSC PCB CO15519 REV 16 © 1980

IMG_7741_zps696db73f.jpg

On which I performed the Composite RCA AV Mod as described in this Link:

http://retro.mmgn.co...ari-2600-AV-Mod

I specifically used the following components and connected them to 2 RCA Jacks as I did on my other PAL Atari 2600 4-Switch console.

"Green TIA Pin 2 (Sync): Direct to video
Yellow TIA Pin 5 (Lum 1): 1k Resistor
Yellow TIA Pin 6 (Lum 2): 220 ohm Resistor
Yellow TIA Pin 7 (Lum 0): 1K Resistor

Red A is for Audio
Blue C is for Color

Pins A and C don’t need any components but you can use\should put a 100p ceramic capacitor on Blue C. Both A and C will then go directly to you RCA jack's."




DSC01805.JPG


Everything works fine and the display is much clearer in relation to the RF output without distortions, however both the RF & RCA output only display in black & white on my EURO CRT 21" SONY TV KV-21FQ10 which is more than capable of display in in colour at 60HZ as it suppots PAL-60 and all my other modded consoles play fine on it with color via RGB Scart.

Is this natural because this is an NTSC console, or is it something which I’ve done wrong, or is there a problem with this specific console?
I note that the RF Output displayed in black & white even before I performed the RCA mod, but I thought it would be OK with RCA.

By the way, this specific PCB has this weird circuit enclosed in a huge plastic block like a brick, which is connected on various points on the PCB which I do not recognize their use. I have no idea of its purpose nor have I ever seen anything similar before.

I considered removing it, but decided not to in case it replaces / fixes some defective components or IC on the PCB and has been added as an external fix.

Could this be causing the black & white display?

http://s1356.photobu...h?sort=3&page=1

Any help will be highly appreciated
Thanks in advanced