(Topic ID: 212013)

TOM power issue. Need pointers!


By RigidCollision

1 year ago



Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by RigidCollision
  • No one calls this topic a favorite

You

Linked Games

Topic Gallery

One image has been uploaded to this topic. (View topic image gallery).

606.jpg

#1 1 year ago

Hi guys,
I have TOM that I have been running for 15 years. My greatest purchase!
Today I powered it on and I got a scrambled display, transformer hum, a single *bing!* and then nothing. No lights on the play field or header. No apparent power to the play field at all, no further sound. I think the scrambled display is power related. It's a new colour replacement screen.

The machine has not been moved, is in awarm and dry environment etc.

Fuses all seem fine. I am stumped where to start investigating further.

Any tips would be greatly appreciated.

Kind regards,

#2 1 year ago

Are you getting 5 volts to the cpu?

#3 1 year ago

Hi Tony,
At the moment I am not sure. I have LEDs on the boards lit which I know isn't the same but may be an indication of power. As you can appreciate in 15 years I have rewired and changed components, connector blocks, solanoids etc but I have never had a power issue before and so have no idea where is safe/applicable to test for voltages (my electrical safety and general skills and tools are ok).

#4 1 year ago

If you have a meter check the power driver board for the 5 volts. There is a 5 volt test pin on the board.

#5 1 year ago

Pin 32 on the WPC rom any good?

#6 1 year ago

Found it...
TP2 5v is reading a fraction under 5.
TP3 12v is just under 12

#7 1 year ago

And TP1 ?

#8 1 year ago

TP1 is 13v.

The symptoms are repeatable. E.g every time I power up I get the *bing* and scrambled screen with no power as described above.

#9 1 year ago

Check the wires in connectors at J116/117/118.
And does J606 have both voltages ?

606.jpg

#10 1 year ago

Hi,
Checked 116,117,118. Can't see any obvious loose/disconnects, no scorching. No signs of obvious degradation/dirt/corrosion

Tested 606 with its plug connected.
12v unr = 13v
5v = 4.8v
Checked ground was OK.

#11 1 year ago

Check your ribbon cables

#12 1 year ago

Ribbons all checked. I have noticed that the blinking LED which indicates the CPU is alive is not blinking and it doesn't change anything if I remove the two data cables from the cpu board and boot the machine.

Promoted items from the Pinside Marketplace
6,850
Machine - For Sale
Menasha, WI
Trade
Machine - For Trade
Hermosa Beach, CA
From: $ 233.10

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside