Photo: robin
  1. » Forum
  2. » Tech
  3. » Tech: Early solid state
  4. » Williams System 6 strange display problem
(Topic ID: 313844)

Williams System 6 strange display problem

By daly124

2 years ago



Topic Stats

  • 5 posts
  • 5 Pinsiders participating
  • Latest reply 2 years ago by PINTEC
  • Topic is favorited by 1 Pinsider

You

Linked Games

Topic Gallery

View topic image gallery

51f392e14ad2f6190c2875d7d3289d4ffdd1cd63 (1) (resized).jpg
20220418_160551 (resized).jpg
0
1
1
#1 2 years ago
OP
 
SPD

daly124

Pinside+ Frequent

US Brick, NJ

7y 57,800 310 13

Need help with displays on a Williams Scorpion.

Game works fine but displays look like this-some digits working, some not working and some are very bright. I've narrowed it down to the MPU as I've tried known working driver board, power supply and master display and the problem is still the same. Also tried disconnecting the slave displays and same problem.

I've changed IC18(PIA 6821) and IC6(decoder 74154) on the MPU and still the same problem. Any suggestions would be appreciated.

20220418_160551 (resized).jpg20220418_160551 (resized).jpg
0
0
0
#2 2 years ago
 
PAT

Brewchap

Pinside+ Frequent

7y 72,550 1,512 1

I would look closer at the Master Display board.

0
0
0
#3 2 years ago
 
TPR

frunch

Pinside member

US Point Pleasant, NJ

11y 135K 3,642 10

Check the edge connectors that plug into the master display board. Bad pins/connections there may also cause that sort of issue, in my experience...

0
1
1
#4 2 years ago
 
SJH

Zigzagzag

Pinside+ Frequent

NO Stavanger

4y 71,300 840 20 12

OP
Quoted from daly124:

Need help with displays on a Williams Scorpion.
Game works fine but displays look like this-some digits working, some not working and some are very bright. I've narrowed it down to the MPU as I've tried known working driver board, power supply and master display and the problem is still the same. Also tried disconnecting the slave displays and same problem.
I've changed IC18(PIA 6821) and IC6(decoder 74154) on the MPU and still the same problem. Any suggestions would be appreciated.
[quoted image]

What happens when you move the displays around - i.e. take the top left display and connect it to the bottom right connector (with power off, of course) ?
Does the problem follow the display (then it is a display issue) or does it follow the position (then it is a cable/connector and/or driver board and/or MPU issue, in descending order of probability) ?

0
1
1
#5 2 years ago
 
^^^

PINTEC

Pinside member

US Chicago, IL

6y 51,550 511

OP
Quoted from daly124:

Need help with displays on a Williams Scorpion.
Game works fine but displays look like this-some digits working, some not working and some are very bright. I've narrowed it down to the MPU as I've tried known working driver board, power supply and master display and the problem is still the same. Also tried disconnecting the slave displays and same problem.
I've changed IC18(PIA 6821) and IC6(decoder 74154) on the MPU and still the same problem. Any suggestions would be appreciated.
[quoted image]

Disconnect the 4 display plugs from the master display.

Power up while they are disconnected Check that the credit match 4 zeros return normal on the master.

51f392e14ad2f6190c2875d7d3289d4ffdd1cd63 (1) (resized).jpg51f392e14ad2f6190c2875d7d3289d4ffdd1cd63 (1) (resized).jpg
Promoted items from Pinside Marketplace and Pinside Shops!
From: $ 90.00
Tools
Pincoder Adapter Rev 1.1
Pincoder Store
 
$ 27.95
Eproms
ROM SCORPION-CPU
Pinballrom
 
$ 65.00
Boards
INKOCHNITO BRIDGE BOARD BY HOMEPIN
Pinball Haus
 
$ 170.00
Displays
Led Display Williams Sys 3 4 6, 4x6Num+CM
Digipinball Shop
 
$ 130.00
Electronics
Type 1 Sound Board for Williams games
KAHR.US Circuits
 
From: $ 11.00
Playfields
NMP--Sensors for Williams 1ST Generation Drop Targets
Troxel Repair
 
$ 11.00
Electronics
Power Supply Capacitor Rebuild Kit for Williams System 3-6
Yorktown Arcade Supply
 
$ 9.95
Eproms
ROM SCORPION -SOUND
Pinballrom
 
Hey modders!
Open a free Shop and start selling on Pinside
Your shop name here

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!

This page was printed from https://pinside.com/pinball/forum/topic/williams-system-6-strange-display-problem?hl=pintec and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.