(Topic ID: 130700)

Sega Baywatch Display driver board voltage problem


By Brandje

5 years ago



Topic Stats

  • 15 posts
  • 6 Pinsiders participating
  • Latest reply 5 years ago by thedefog
  • Topic is favorited by 2 Pinsiders

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#1 5 years ago

Ok, I'm i need of some assistance here.

I have a problem getting the display board on my baywatch to work, Ive been reading alot about how these things can cause lots of trouble with the slightest deviation in the 5 volt line.

Now when its powered on, without the display board connected I measure a steady 5 volts, but with the board connected, it drops to around 3 volts.

any help would be appreciated

#2 5 years ago

check the bridges and the caps, most of the time it is the capacitor leaking causing lower voltages. I have had to do this on 2 baywatch machines and one frankenstein

#3 5 years ago

So you mean the caps on the display board, or power board?

#4 5 years ago

These are the Power Supply Board in top left.

#5 5 years ago

Wel that's the strange thing, all my voltages are ok.

I hooked up an external 5 volt to my display board, and as soon as I connect it power drops to 3 volts again, this thing is driving me nuts :p

#6 5 years ago

Have you done the upgrade kit to the power wire yet? http://mad-amusements.com/product.php?id_product=1379

I realize they are out of stock, but Pinballife usually has them, but their website is down until the end of the month.

Here is a link to the bulletin: http://www.sternpinball.com/upload/downloads/sb106.pdf

#7 5 years ago
Quoted from PTHermes:

Have you done the upgrade kit to the power wire yet? http://mad-amusements.com/product.php?id_product=1379
I realize they are out of stock, but Pinballife usually has them, but their website is down until the end of the month.

Yes, the kit itself takes 5 minutes to make yourself if you have some wire and IDC or molex connectors. Resolves some of the reset issues.

#8 5 years ago

Kit is already installed, yet the problem persists, nice 5 volts when not connected but a drop when connected.

#9 5 years ago
Quoted from Brandje:

Kit is already installed, yet the problem persists, nice 5 volts when not connected but a drop when connected.

5v cap replaced on PSU?

#10 5 years ago

Does the game even boot when the display board is connected? If the voltage drops to +3v, the CPU probably won't boot either

#11 5 years ago
Quoted from Brandje:

I hooked up an external 5 volt to my display board, and as soon as I connect it power drops to 3 volts again, this thing is driving me nuts :p

If the external power supply provided sufficient current to the DMD then something on the DMD board is pulling the voltage down.

#12 5 years ago

ordered some new caps for the power board, but I'm still convinced the problem is in the display board.

Quoted from Hana9so:

Does the game even boot when the display board is connected? If the voltage drops to +3v, the CPU probably won't boot either

Yes, boots just fine, i can play without any problems, just no display

Quoted from terryb:

If the external power supply provided sufficient current to the DMD then something on the DMD board is pulling the voltage down.

My thoughts exactly, but i cant figure out what.

#13 5 years ago
Quoted from Brandje:

My thoughts exactly, but i cant figure out what.

This type of issue is not easy to narrow down. It's often easiest to cut the 5 volt traces to narrow down the issue to a general area and then narrow it down from there by removing components.

#14 5 years ago

found a new display board, and things are up and working again, no clue what caused the other boards problems. thanks for all your help!

#15 5 years ago

Good to hear.

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