Mattel intellivision

Hi folks, Anyone have any troubleshooting expertise on these things? Got one of my spares out for sale and typically the bloody thing is pretty dead. I say *pretty* dead 'cos I get the cart intro screen on power up, but with the computer module attached I get nothing. I've left it powered up for 15 minutes in case it's a warm up problem but that makes matters worse :) According to the service manual I have to replace either the RAM or CPU in that order, but since spares for those will come from working intellivisions I don't want to do that! Also, off the top of my head I can't think of any other videogames that use the General Instruments GI1610 CPU, assuming it's that that's croaked. The RAM is a GI-specific chip too. Spares, anyone? TIA :) -- Adrian/Witchy Owner & Webmaster, Binary Dinosaurs www.binarydinosaurs.co.uk - possibly the UK's biggest online computer museum www.snakebiteandblack.co.uk - ex-monthly gothic shenanigans :o(