Had the boards reworked and NVRAM installed. Now after about 10 minutes of play the pin will either lock up in the middle of a game or finish a game and refuse to restart another. When I power it down and back up I get the7 blinks on the MPU but no game. If I let it sit for 15 minutes and come back...All is well and we play...at least for 10 minutes then BOOM Locked up again. Something must be getting warm but what? Where to look and how to check.. I am new to SS games. My equipment is a craftsmen Multi meter...LOL My experience is mostly EM Thanks gents!

I cleared the audit. It helped!!! I played five games in a row. That would not have happened before but now from time to time when I go to PacMan saucer the vidgrid plays really slowly. And the lights are dimmer and kinda flickering until I come out of maze. Then game plays straight again. I am about to replace the vid grid with the led version.

Spoke too soon. Problem persists. And sometime when turning the pin on it goes really slowly through the start up displays as in BALLY etc. then all the GI just flickers and won’t start a game. Uhgh

would the transistor under the resistor cause an intermittent problem?

Ok. Now to find transistor on Marcos site. I got to place an order anyway

ordered the transistor... We shall see in a few days.. LOL

Snyper 2099 I think you may have NAILED IT. While waiting on the delivery of parts from Marcos I played it until it locked up. I didn’t have any spray but I put some ice cubes in a sandwich bag and touched the questionable transistor with it. About 5 seconds later it went into tilt and reset. I then played again and repeated.

Are you familiar with the VID Grid? I had a bulb or two out on the old board so I replaced it with the LED version One of the LEDs still doesn't light so that must be a problem with the pin. I checked continuity of the line from the lamp driver to the vid grid Good also checked the resistor and transistor associated with said light (number 3 yellow) and they check out the same readings as all the other transistors and resistors...

vid grid problem was bad connection on the J2 plug at the lamp driver transistor 5 did not solve the reset problem waiting on 2 watt resistor now...

Ok So I replaced the Q 5 transistor and the 2 watt 82 ohm resistor next to it... the reset problem persists and the new resistor still gets hot as heck. When the game locks up I can cool down the new 2 watt resistor with the ol icecube in a bag trick and we can play again.. Something is making that 2 watt resistor get hot Any idea what it my be? Do you think the kit you mentioned above will solve the problem?

BINGO. Carefully cooled U 14 by holding the bag on it from above so as not to contact R 11. She tilted and reset. So what’s next. U11 replacement?

yes
it tilts then plays normally

when I cool it the game says "BAd Move" which is tilt then it starts the next ball and plays proper for a bit then repeat

this is the deepest I have been into a solid state game A great learning experience order from Great Plains? I also need to replace the connector on the lamp driver board J2 ? i believe I can monkey around with the wires and get ALL OF THE LEDS working on the new VID grid what tool and supplies should I order and have on hand for this task?

wouldnt you know/// out of stock at GP

I have had all of the yellow and red lamps working but I have to manipulate the wires going into J2 So I GUESS it needs to be repinned. I have never done that before but this is a learning experience I need to buy the proper tools I have Lost World with a bad connector too

I will check for cracked solder tonight... meanwhile. I ordered a nice pair of nippers to cut the IC chip legs and 10 IC chips "Just for a stockpile" from DigiKey and I also ordered the Light board J1 J2 J3 and J4 repinning kit and crimpers from Big Daddy. Should be ready for a learning curve now

Solder on the pins was not the prob I reheated all the spots and the problem was still there on the vid grid. I will re pin J3 when the bits arrive. If anyone could point me to the link on removing the 2 watt resistor (NVRAM mod) I would appreciate it AND THANKS TO ALL FOR THIS GREAT HELP!

I found the post Now I have to find zero ohm jumpers

thanks Quench my repin bits should be here next week

J1 and J2 repinned problems still have a few lights out My first pin job I will track down the wires for the particular lamp and re repin them

I have removed the CR5 and CR7 and replaced with jumpers also removed R11 Still waiting on the backordered Chip Now I have a flipper coil problem to track down Right side gets hot after about 5 games and drags EOS maybe?

and now f 4 fuse blows... I am thinking the flipper coil is fried

this has been a money pit and the game is not worth it but I am looking at it as the price of SS pinball education

I ordered new coils and eos just in case
Now back to the vidgrid lights that are out ( Yellow numbers 2 and 3 ) I have repinned and replaced the connector at the lamp driver. Remember I could fiddle with the wires there and get the lights on.... I also reflowed the solder on the pins of the connector on the back of the lamp driver ... still out but I can put side pressure on the connector at the lamp driver and get lights on. I have scuffed the old pins with a scotch bright pad to clean them. Bad pins??? I ordered new male pins and plan on replacing the pins on the driver... I dont know what else??? LOL thanks for all you guys help! I have learned much that I hope to apply to my LOST WORLD pin that I have in Que

So I replaced the vid grid with led version No fix. Then I repinned the connectors at the lamp driver. (My first time with that lovely job). No fix. Then I replaced the header pins on lamp driver (again first time with that job) and voila. We have all yellow lights! I replaced the Lower right flipper coil and both eos switches. Now no flipper problems. I learned A ton of new stuff and have more tools and supplies now. All that’s left is a few gi bulbs.

Would never have been possible without the great help here. Thank you. I will be bugging you all again soon I am sure. Now on to installing 4 plasma pop bumpers from lighted Pinball mods into the Black Hole.