I have a problem with my lw3. One day it started to "energize" coils while powering on the machine. And if I hold 2-3 seconds - fuses in my home were blown.
(it was something with CN11 on the CPU) - after a check - there was one transistor blown. After replacing it with a new one, machine starts up (the "energizing coil" sound is still there but it is much shorter now) and there is nothing on the DMD (i have checked with another DMD - so DMD is not the reason) - for like few minutes (1-2, I didnt time it...) THEN the animations show up (and PIA led on the CPU is finally turned off) but there is no sound.
So when I leave the pinball turned on for few another minutes - the sounds start to be heard...at first stuttering and restarting, but after a while it is ok - I can play and everything is ok. Turninig off and turning on again - boots up instantly, with sound etc...
So it looks like after a "warm up" it is ok.. pin is kept in 16-18 C... Reseating the connectors didn't help with it...
do you have any idea what might be causing this weird behaviour? I have NVRAM since some time but that is not the reason..
Thank you for all the help.