m0ckery Posted February 16, 2021 Share Posted February 16, 2021 Hi guys, I've got a PAL Rev D Colecovision that displays a black screen when powered on (no Coleco bios displayed/etc). I've tried using Expansion Module 1 and 2600 games work well - so at least I know the RF side of things works. Some of the original dram chips were quite hot to the touch so I figured I'd start troubleshooting by replacing the dram with the 5V mod. I've removed L2/L3 and the old dram chips - then linked L3 to 5V and installed sockets. I tested the connections from the dram to the VDP by the directions on the Console5 wiki and everything is connected as required there. I inspected everything thoroughly before adding the sockets and all traces looked good with no obvious shorts. A voltage test at pins 8 & 9 of the dram shows a voltage of 4.9V - however pin 1 is showing a voltage of around 1.7v. This links up with the voltage on the non -5v side of L2. Does anyone have any idea of where this might be coming from? Thanks in advance :) Quote Link to comment Share on other sites More sharing options...
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