tidjo12 Posted August 24, 2014 Share Posted August 24, 2014 I need help for a colecovision repair. When I plug any controllers on port 2 of my colecovision, the triggers won't work, even if they work in port 1. I've ordered some controller chip and soldered a new one but the triggers still doesn't work. I don't know what to do anymore but I don't want to throw it away and buy another colecovision, this one is important for me. If someone could help me I would really appreciate it. Thank you for your time^^ Quote Link to comment Share on other sites More sharing options...
bradd1978 Posted August 24, 2014 Share Posted August 24, 2014 Try reflowing the solder on the 9 pins of the controller port where it connects to the PCB. This should help. Also make sure the controller chip is soldered in the right way Quote Link to comment Share on other sites More sharing options...
tidjo12 Posted August 24, 2014 Author Share Posted August 24, 2014 I resoldered the 9 pins and checked if the chip was correctly soldered but the triggers still doesn't work on port 2. :s Quote Link to comment Share on other sites More sharing options...
SkydivinGirl Posted August 25, 2014 Share Posted August 25, 2014 I have the same issue on one of my CVs but, in addition to the side buttons not working, a couple of the numbers on the pad don't work either. Heather Quote Link to comment Share on other sites More sharing options...
CrazyBoss Posted August 27, 2014 Share Posted August 27, 2014 It make sense. But dont know what you problem, is - did you change the controller ic's ? Firebutton is bit 6 and bit 0-3 is the pattern for the keypad. I had a mainboard, where the controller didn work - i did change the controller ic's But still have problems, so god a "new" mainboard and then it worked. Quote Link to comment Share on other sites More sharing options...
SkydivinGirl Posted August 27, 2014 Share Posted August 27, 2014 I had replaced the old controller chips on mine and tried a known and even swapped the chips between the ports because port 1 works perfectly. Still not working. I'll probably just have to get in there with a meter and maybe a scope to see what's up. Heather Quote Link to comment Share on other sites More sharing options...
+nanochess Posted August 27, 2014 Share Posted August 27, 2014 I would test pin 19 of each 74LS541 with a logic probe to see if it's being decoded. Quote Link to comment Share on other sites More sharing options...
SkydivinGirl Posted August 27, 2014 Share Posted August 27, 2014 Unfortunately, I don't have a logic probe, but I can capture it with my scope to get the information. Too many projects, not enough time. Heather Quote Link to comment Share on other sites More sharing options...
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