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WG K7000 dead... flyback? (SOLVED)
MKFan4Life:
Hey hey! Got the K7197 running! I replaced that diode, D10, that I accidentally snapped in half after an Ebay order for a 100 pack came in. Then I desoldered the voltage regulator (STR30130) and tested it once again out of circuit. Still shorted between pins 3 & 4. Tested the new one and installed it on the board. Put the whole works back into old MK1 and Whoohoo! She's running again.
I checked the B+ at R301 and it was around 172V on the input side, and 132V on the output side. Doesn't look perfect but damned close.
After adjusting a little, the picture looks really good. Nice focus and good brightness. I do see one anomaly. Some vertical lines on the left-hand side that are only apparent when a plain dark screen pops up. Just looks like 3 or 4 vertical static lines that don't quite cover half the screen. Randy Fromm's flowchart points to C57. Sound right to you guys?
I capped the chassis maybe 10 years ago, then when the HV Shutdown problem happened, the game sat from 2016 until now. The caps might have been older to begin with. They were from Bob Roberts, and lately I've seen some posts that his kits had aged caps to begin with. I know his site had stated he was once into various things (pinball, pool tables, jukeboxes, etc.) and had kept classic gaming parts and electronic parts, but I was never sure if his caps were being freshly replenished or were all NOS.
Either way, I likely need to go ahead and install a fresh cap kit in this one. Thank you to ALL the people here for helping! Now I can start my summer semester of industrial electronics with ---my bottom--- sitting where I am now on this computer in the morning! Lol! Nothing like learning to troubleshoot and build electronic circuits via computer! Damned Corona.
;D