I'm hoping the Pinside regulars will jump aboard this topic and lend some help. I'm a noob to WMS System 3-7 games, and I'm regretting being brave enough to learn! I have a WMS Pharaoh that came to me and it didn't boot. GI only. No life on the MPU, no displays. The game has original boards and a Rottendog WDP3211A power supply.

Here's what I've done so far before I did the initial power on:
- New sockets for ROMs and other chips on MPU.
- 40-Pin interconnect re-done.
- Re-flowed all pins.
- TIP-42 to MOSFET/resistor upgrade.
- Added fuses to the backbox rectifiers.
- Barakandl's solenoid saver conversion.

I've got the thing to power on and give steady voltages. I'm currently at a "0" on the MPU and one bottom LED light solid, with no score displays.

I'll be reading through Clay's guide this evening, if I can source a copy, but any leads on where to start with this issue would be appreciated.

R

OK...so I've burned and installed the test ROM and followed the guide here: http://www.flippers.info/system6repairpart4.asp

I jumpered the board to handle a 2732 test rom as that's all I had on hand.

The LEDs and digit pulsed upon applying 5V.

I get pulsing signals from pins 2-17 of the PIA.

When I press the diagnostic button, I get flashes of numerals 1-2-3 in the display and then it returns to normal pulsing. I'm not quite clear on if that is supposed to happen? Maybe I'm misinterpreting but I think the numbers would stay locked on if there was an issue?

I added the driver board via 40pin interconnect, and the LED pulsing occurred.

I added ROMs one at a time, and the pulsing occurred.

Removed the test rom and added the remaining flipper rom and put it in the machine....I still get no action on the MPU.

Direction please?

Yes, it works with the driver connected at the bench.

On the bench with driver attached, I add one rom at a time. The digits blink with each Rom addition. When I replace the last rom in place of the test rom at U17, I get a solid "0" and LEDs at both the bench and in the game.

In the game, it boots with the test rom (flashing) with only 1J2 and 2J8 connected. I can't get it to boot with the game roms (solid "0").

I do.

I probed the display PIA (as outlined in the above guide) and found it to be pulsing as it should.