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Ianr757

Colecovision Black Screen after Controller IC Replacement

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Hey all, a weird issue has arisen with one of my Colecovisions. I replaced the controller ICs using the kit from Console5, simply clipping the old ICs out, removing the legs with the iron and new solder, and cleaning up the old/new solder mixture before putting in the new socketed ICs. Once I finished that up, my CV would only boot to a black screen, with occasional tonal noise accompanying it. I thought maybe something went wrong during the install, like a short to another motherboard IC (didn't really see why this would happen, but I thought that stranger things have happened). So, I performed the 5v RAM upgrade. Nada. I desoldered the VDP, socketed it and tried a spare. Still nothing, black screen on boot. What could possibly have happened here? Are the controller ICs in any way connected to the Colecovision's power or video circuits, maybe the BIOS chip is getting shorted? I think some solder may have connected from pin 11 of the player one IC to the main board, which I could not seem to remove, but I didn't see any reason for why that would cause this issue, unless maybe it is causing a problem with the BIOS chip. I should also note, but Atari 2600 expansion module still runs fine, which tells me that the console is still getting power and that most components are still working. Any ideas? Thanks.

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Update, got it working again! Cleaned up the solder area, messed with the rf tuner, and corrected a broken trace from ram to vdp. All good. 

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Glad for the happy ending!  Especially if you were up all night trying to fix it, which would be the case if the times on your postings are correct.

Not poking fun at you, at all.  Been in that boat myself, more than once.

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