Stern LOTR: Help, I Somehow Killed an Entire Switch Column


By DANGERTERROR

3 months ago


Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 3 months ago by DANGERTERROR
  • No one calls this topic a favorite

Find

Search this topic for posts matching certain words or written by a specific Pinsider. Or both!




Linked Games



Topic Gallery

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

IMG_5285 (resized).jpg


#1 3 months ago

My right slingshot was misfiring so I began to fiddle with the switch blade spacing. While doing that, the switch died completely -- along with the entire GRN-GRY column (lanes and slings). I yanked the diode out and tested it, and it was indeed bad, so I thought I'd found the issue. I reflowed the solder on the switch and added a new diode and ... no change. The column is still dead.

So: I have a few more wire continuity tests to do (game is on location and I'll be back this weekend) but I have a bad feeling this is a board issue. Could a bad diode or some other sort of under PF issue knock out a switch column?

And: I saw that upstream from the column connector are transistors (confused by that), is that likely the component that's bad? I do have a donor board I can mess with.

I did a bunch of searching and couldn't find any Stern switch matrix problems/solutions like this. Any advice on testing or potential board issues is welcome.

IMG_5285 (resized).jpg

#2 3 months ago

If you think it might be a board problem disconnect the playfield and test the switch matrix with jumpers. If it's still bad it's a board problem.

#3 3 months ago

If you verify if this is a board problem,you will need an o'scope or logic probe to troubleshoot further, but most likely you blew Q8 and replacing it should fix the problem.

#4 3 months ago

For the jumper test, would I simply “close” the switch on each pin by jumping the GRN-GRY column to each switch row pin?

I think a have a transistor year I can do on Q8 after that.

Thanks for the ideas so far!

#6 3 months ago

It’s pictured but not explained: but basic enough. No diode needed, you jumper the row and column pins in Switch test mode. I can do this. Will report back.

#7 3 months ago

Pin test confirmed column is dead on the board. No switches activate when jumped from pin 9. Replacing Q8 — still worried something under the pf can blow it again. Or maybe it was bad from the start? Yikes.

#8 3 months ago

Replaced Q8 and all is good.

Promoted items from the Pinside Marketplace
€ 159.00
Cabinet - Toppers
FlipperLED
Wanted
Machine - Wanted
Stafford, VA
From: $ 16.95
From: $ 119.99
Lighting - Backbox
Rock Custom Pinball
From: $ 35.00
Lighting - Interactive
Professor Pinball
$ 12.00
Playfield - Protection
Pin Mods
5,900 (Firm)
Machine - For Sale
Jefferson, NJ
$ 35.00
Cabinet - Decals
Bright Lights Pinball
$ 99.99
Lighting - Other
Lighted Pinball Mods
From: $ 42.00
Cabinet - Shooter Rods
ModFather Pinball Mods
$ 219.99
$ 229.99
Playfield - Toys/Add-ons
PinballBulbs
$ 40.00
$ 22.00
Cabinet - Sound/Speakers
ModFather Pinball Mods
From: $ 35.00
Lighting - Interactive
Professor Pinball
$ 150.00
Lighting - Interactive
Professor Pinball
$ 9.95
$ 130.00
Playfield - Toys/Add-ons
ModFather Pinball Mods
$ 48.00
Cabinet - Other
ModFather Pinball Mods
$ 96.95
Cabinet - Shooter Rods
Super Skill Shot Shop
$ 15.50
Lighting - Led
Lermods
From: $ 19.50
Apparel - Unisex
ArcadeMade

Reply

Wanna join the discussion? Sign up for a Pinside account, or log in if you already have an account.


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