I lost all MPU controlled playfield lights on my Flash and was reseating connections (fuse OK, correct voltages on power board). Decided to reseat 40 pin connector, then once the boards were separated I decided I should finally replace the 40 pin female. When I pulled the driver board, I placed it on the glass of another pin and before I knew it, it slid onto the floor. So I had to replace two broken TIP42 transistors. So I did. And I put it all together with new 40 pin females. (Note: I replaced the IC3 on the sound board recently after losing sound, which brought back my sound.)

1. My playfield lights are back, but not consistently.
2. When they go out, my scoring displays go out. I disconnected/reconnected everything, they all came back.
3. My sound test button gives me one sound over and over.
4. When the PF lights and scoring displays are working, the only sound I get is the Flash explosion SFX but ONLY when i hit the flipper buttons. Same for EM sound mode, ding! on flipper hit.
5. When the PF lights and scoring displays are working, the two red MPU LEDs flash once and go out. When the PF lights/scoring are out, the lights stay on.
6. When I ran the solenoid test, it tested about 3 solenoids ... then some clicking in the cab and the PF lights went out, and scoring displays went out.

So, would a solenoid short possibly cause this strange stuff? Should I stay focused on connections, or possible additional damage to the driver board? Tests I should do?

Will do. Thanks.

Update: Waiting on GPE order for various parts, including a new 40 pin male AND re-replace the female interconnect. (I bent some of the female contacts when I seated it.) I don't have Scanbe on the power board (RN), but did find one under my sound board ROM. Planning to replace all.

Found a loose,toasty blue wire on the lamp bridge rectifier. Fixed that. And added the BR fuses per Vid. That seemed to stabilize a lot of issues.

Wondered if I had a bad diode on the right flipper since I was getting sound when I pressed the right flipper button. When I lifted the PF, the ground on the right coil came off and I started to study the wiring on the flipper coils and wondered something. There is a thick, like 12 gauge, red wire that runs between the power lugs of the lower coils, even though there are blue wires going to the power lugs from the PF fuse. I can't find that wire on any illustration on flipper coil wiring. Is it some "get it running" hack, or does it have a purpose?

Still no normal game sound, even though sound board test button works. Hoping Scanbe is the culprit.

I went ahead and disconnected the odd red jumper between flippers and it didn’t seem to affect flipper action. Now I’m left to wonder why it was added.

A little Vid Bulletproofing up next, with some flipper rebuilds.

The test button does what it should, just cycle through a single looping sound. I thought I remembered it cycling through all sounds but that was running the test in the diagnostics (not working for me). I’m also not getting sounds when I test grounding the pins at the upper left header pins like in this video.

I replaced the 40 pin, both sides. Replaced the RN sockets on the MPU including the PROM sockets.

Now it's booting to audit mode, (no PF lights, no diagnostics) but instead of getting 1486 2 game code in player 1, I'm getting 4040. It seems to cycle through a different set of settings as I push the coin door button, but they don't match up to the 1486 settings.

I put in new AA batteries.

So, from what I can tell from my reading:
1. Maybe my 5101 RAM went bad? I would probably replace with NVRAM.
2. Maybe I screwed up the ROM chips?

Any other ideas?

I hope I didn't screw up the 40 pin or socket installations. I tested continuity on all and everything thing seems to be OK. While extracting a PROM socket, I lifted a trace and had to use jumpers on the back of the PCB.

Aside, would Leon's test ROM help? Still available somewhere?

Big thanks for help.

Went ahead and ordered the 5101 and the 6810 replacements.

I added new sockets for the 6810 RAM and the 5101 chip. Also replaced those chips. Still getting the odd 4040 code in Player 1, still booting to audit mode.

When I power on, the LEDs flash once and go out. When I push the self test, the lower LED stays on.

I'm wondering if my ROMs were fried somehow. I just noticed that in the process I lost by "green flipper" labels on my ROM. Can't find them anywhere...

Is it rare for ROMs to go bad? Does the order on the PCB matter? I wonder if I screwed up the order when putting in the new sockets.

pincoder I don't have a ROM burner so I'd have to buy test ROMs, but wonder if it would just be easier to get new ROMs.

Here’s a video of what I’m getting as I go through settings. Not normal.

I've had it for two years and it was fine, then it started to get flaky. Fine one start. No PF lights the next. No sound the next. So I replaced the 40 pin interconnect on both boards. Then did some Vid bulletproofing: Replaced the RN sockets with machine pinned ones. Then replaced the TIP42 lamp matrix transistors with IRF9Z34N MOSFETs and 0 ohm resistors.

I should say that when I did the 40 pin female i lifted a trace but but jumpered it and tested the connection continuity and it seemed to be OK.

I found a pic I did before the work, and it looks like I have the right chips in the right locations. I really should learn to label things better.

Thank you for helping. I'm posting ROM pics and other work done.

ROM Right (resized).JPG

ROM Left (resized).jpg

RAM Right (resized).JPG

More pics for reference of other work done.

MPU (resized).jpg

Driver (resized).jpg

MOSFETs (resized).jpg

IMG_3252 (resized).jpg

IMG_3253 (resized).jpg

Recommendations on ROM sources? K's Arcade?

I'm wondering. My pics show I have three PROM chips and two ROM chips. If I replace, am I eliminating the ROMs at IC 17 and 20? Or keep those and just replace the PROM chips at IC21, 22, 26?

Screen Shot 2019-03-19 at 10.54.13 AM (resized).png