On 04/09/2016 5:29 AM, Noel Chiappa wrote: If you suspect solder try simply reheating the legs of the suspect chip to see if that cures it. It could also be that the chip is drifting out of tolerance and the clip you put on it added enough extra capacitance (we're talking picofarads here) that it was happy again. The IC socket may add just enough capacitance again to help the chip get back into its operation band. Has anyone else got a similar board and that particular chip has a very small value cap on one or more of its legs? I see this on my 1970s video game boards from time to time - a board the schematics or in my meagre collection of service bulletins for that game. The job was obviously factory as the connection is as clean as all the other connections on the board. Data books don't talk much about this bypass caps issue either, I believe it is part of the 'magic smoke' of TTL logic... John :-#)# -- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"