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Posted Sun Jul 16, 2017 9:54 PM
Posted Mon Jul 17, 2017 5:33 AM
Have the controllers been switched to see if the same problem occurs for the second player?
Posted Mon Jul 17, 2017 5:41 AM
I have a similar problem with one of my consoles.
It automatically fires on port 2 without a joystick attached
Posted Mon Jul 17, 2017 7:02 AM
Posted Mon Jul 17, 2017 8:19 AM
Posted Mon Jul 17, 2017 8:21 AM
Posted Mon Jul 17, 2017 8:31 AM
Two larger IC's on the lower right hand side of the motherboard. TIA on top / RIOT on the bottom.
Here's a quick pic/label of the 4 major chips:
Posted Mon Jul 17, 2017 9:17 AM
Posted Mon Jul 17, 2017 12:38 PM
I would start with replacing the RIOT first and test from there.
Posted Mon Jul 17, 2017 4:28 PM
Posted Mon Jul 17, 2017 6:09 PM
I replaced the RIOT first, but it still has the problem. I'll have to try the other one tonight...
If the RIOT is known to be good, and you've got a socketed board, verify that all the pins are making good contact with the socket wipes. If there's nothing wrong with the chip or the socket, you'll need to pull out a multimeter and verify continuity all the way from the controller jack pin all the way to the chip. Something is shorting the pin making the system think the controller is being held. There's probably a tiny piece of conductive debris (solder blob from prior mods or repair work?) shorting the pin, or you've got a shorted capacitor on the line.
Posted Mon Jul 17, 2017 6:28 PM
Posted Mon Jul 17, 2017 6:36 PM
Only one of the ic has a socket, and it isn't the RIOT. I just desoldered the old one and took one off a parts board. I will check to see if there something wrong between the chip and the port. Maybe I will replace the capacitor first. Thanks!
Ah, too bad. I always recommend installing a socket if you remove an IC from a soldered board. That way on the off-chance your replacement chip is wonky or fails again, you can replace it more easily (bitter experience - having purchased two 2600's over the years with bad RIOT chips).
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