Outgassed displays and the 5 V supply

An outgassed display draws no more high voltage than a working one; HV draw follows how many dots are lit. It probably does load the 5 V supply more, and outgassed displays have been linked to resets, so replace them, especially on games like Twilight Zone. Some display makes draw much more 5 V than others, nearly double in one case.

Systems

• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Games

• Twilight Zone

Related tips

• Dot matrix display goes blurry within minutes
• Random display lines and all flippers energising at power-on
• DMD dead though display and controller work in other games: CPU board fault
• Dot matrix display supply voltages
• +62 V reads over 70 V
• +62 V collapses to about +12 V under load
• +5 V or +12 V missing at the display
• Which dot matrix displays fit WPC games

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)