WILLIAMS DISPLAY HELP WILLIAMS SYS 3 to 6

[ddstoys]

Can anyone help me im trying to repair a williams display its the type with the million trasistors instead of chips.

  So far ive tested every resistor and diode which check out ok replaced the 6 ics it does have with no luck and anll the transistors test ok but the method isnt 100% acurate does anyone have a schemtic for this style of master display???  Or any idea what  to try next? I really dont feel like replacing all the transistors unless i have no other option

[ddstoys]

PROBLEM solved the firepower website saved the day again.      But if anyone has a schematic for this style board id appreciate a copy as i have a few of these in machines and would be handy if a fault occurs 

[Mr Pinbologist]

Daniel, i have the schematic.. i can scan and email it to you if you want

[goodolddays]

Hey Daniel .
Care to share what the solution was ?

Cheers
Dave

[ddstoys]

Thanks Mitch a copy would be great.

The problem was one of the transistors not functioning properly so was feeding the same digit info to two displays causing one to fail and the othr display very b right garbage.   I found this because with the one display unplugged one of the digits was brighter than the other found which strobe controled it and cut off the transistor and all display came good except for that digit

[goodolddays]

Sweet . You never know when that info might come in handy for someone else. Keep powering along on this project Daniel 

[Mr Pinbologist]

Thanks Mitch a copy would be great.

The problem was one of the transistors not functioning properly so was feeding the same digit info to two displays causing one to fail and the othr display very b right garbage.   I found this because with the one display unplugged one of the digits was brighter than the other found which strobe controled it and cut off the transistor and all display came good except for that digit

email sent