Need help, Colecovision triggers doesn't work on port 2

[tidjo12]

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^^

 

[bradd1978]

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

[tidjo12]

I resoldered the 9 pins and checked if the chip was correctly soldered but the triggers still doesn't work on port 2. :s

[SkydivinGirl]

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

[CrazyBoss]

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.

[SkydivinGirl]

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

[+nanochess]

I would test pin 19 of each 74LS541 with a logic probe to see if it's being decoded.

[SkydivinGirl]

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