(Topic ID: 190005)

CPU won't boot (WPC-S)


By RonaldRayGun

2 years ago



Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by PinballManiac40
  • Topic is favorited by 1 Pinsider

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#1 2 years ago

My CPU (WPC-S) won't boot. All cables to the CPU board are removed except J210, which is the power from the driver board.
D19 is on.
D20 is off.
D21 is on.

Voltage measurements:
TP2 5.02V
C31 4.98V
D1 4.98V positive side, 4.77V negative side.
U21 pin 14 4.77V
U8 (RAM) pin 28 4.77V
U25 (Game ROM) pin 32 4.98V

Anyone knows where to start troubleshooting?

#4 2 years ago
Quoted from cosmokramer:

Disconnect everything from the cpu except power and see if it boots...

All cables are removed except J210 (power).

#6 2 years ago
Quoted from The_Director:

Is this a new board that has had any chips transferred or a board that was working that now doesn't?

It's an old board that was working and now doesn't.

The background story is it had resetting problems so I reseated J210, and it worked fine after that.
Later I took the board out to relocate the battery box and when I put the board back in it booted up but didn't fire solenoids and lights. I reseated the ribbon cable to the power board and after that it doesn't boot anymore.

#8 2 years ago
Quoted from PinballManiac40:

Try pushing on the U9 ASIC chip.

I tried a gentle tap on the ASIC but nothing happened.

#10 2 years ago
Quoted from PinballManiac40:

I actually mean push down on the ASIC chip with the power off to make sure it is seated in thr socket. Actually it it is best if the board is laying flat on a table when you do this.

Got it. I will remove the board and try it out. Thanks.

2 weeks later
#11 2 years ago

I reseated the ASIC chip and the game now boots up. Thanks PinballManiac40 for the help!

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