(Topic ID: 102085)

LW3 CPU board issues?

By Ripcord

6 years ago

Topic Stats

  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 6 years ago by CadillacMusic
  • No one calls this topic a favorite


Linked Games

#1 6 years ago

Hi all,

So I picked up a LW3 a while ago, and it's been steadily developing worse issues.

Since I got it several months ago, occasionally the system would seem to sort of soft-reset: The DMD might re-initialize and show the bootup again, the startup sound might play, or both. In each case active games continued to play and what was happening on the playfield wasn't interrupted (or scoring, etc). Every so often what was happening on the DMD would lag behind in seeming to get updates from the game board - some sort of on-screen activity might complete, but the DMD not return to scoring screen. This includes cases where the DMD continued to update (as if the game didn't exit a particular game mode, but was still getting updated, even though the sound and playfield activity change), and so on. Every so often the game would "hang" - flippers still worked and and a few things still active, but the playfield generally become inactive.

Now I'm at a point where the game freezes like this after only about 5-30 seconds. Sometimes I can get through 3 minutes. Entering self-test will also occasionally freeze like this. In each case I hear the startup noises getting kicked off a few times before the freeze.

19 times out of 20 self-test passes, but occasionally it ends up in a failure state, with PIA LED flashing twice - check EEPROM in slot 5B. Except there is no EEPROM in 5B in this system, and there shouldn't be =)

I'm thinking about ordering a complete new EEPROM kit and replacing them (my first time doing that). Anyone have any other ideas before I do? Or advice if I replace the EEPROMs?


#2 6 years ago

Most often symptoms of the game abruptly resetting or ending at different times is related to bad caps on either or the power supply or elsewhere in the game. Checking for strong +5 voltages at the MPU and display board is the first step.

If voltage is low or waining, you likely need caps, or connectors addressed, or both.
Next most likely culprit are sockets on the MPU.

#3 6 years ago

I wouldn't say it specifically resets or ends exactly. Some component seems to reset, and I hear, for example, the startup noise again. And eventually seems to hang in some way, either temporarily or permanently.

My electronics testing kung-fu is improving but still weak. But let me see if I can figure out the best way to test strong (high?) +5 voltages at the MPU and display boards, like you suggested.

#4 6 years ago

Ok, as best as I can tell voltage is normal, between 4.87 and 4.98 volts. So I'm good there?

#5 6 years ago

Battery leakage? Any blue/green/white fuzzy stuff of the board below the battery holder? Look closely at the CPU (large chip below the batteries) legs and socket. If they're dull and not shiny metal, battery leakage is possible.

Rob Anthony
Pinball Classics
Quality Board Work - In Home Service
borygard at gmail dot com

#6 6 years ago

Nope, no battery leakage. Moved the batteries off-board to an external carrier which is on the bottom of the backbox and out of the way of harm. And not leaking.

#7 6 years ago

Check the connector for 5 volts on the power board, and make sure none of the pins have cracked solder joints. I spent a couple hours pondering over our LW3's sound resetting, and in the end the connector just wasn't pushed in enough. Whoops.

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