Introduction and Basic Capacitor Function

• Early 2000s reports of abnormal PC motherboard failures with leaking/popping capacitors
• Symptoms: loud pop sound, fishy smell, black screen, computer won't reboot
• Capacitor basics: stores electricity, discharges quickly (microseconds)
• Structure: two electrodes (anode/cathode) separated by dielectric material
• Electrolytic capacitors (ecaps): use electrolyte as cathode, can be solid/gel/liquid

Electrolytic Capacitor Construction and Usage

• Made from two aluminum foil strips with porous paper separator
• Paper and gaps saturated with electrolyte
• Anode foil coated with aluminum oxide (dielectric)
• Sealed in protective aluminum housing with possible vent
• PC motherboards contain ~60 ecaps for power filtering and decoupling
• Used to smooth AC-to-DC conversion and voltage fluctuations
• Also found in camcorders, VCRs, televisions, stereos, LCD screens

Industry Scale and Aging Characteristics

• Multi-billion dollar industry: $3-3.5B in 2002, $5-6B today
• Suppliers mostly Japanese, Taiwanese, Chinese
• 2002: 22.5 billion ecaps made in Taiwan (30% of market)
• Natural lifespan: 10-20 years due to electrochemical aging
• Aging measured by equivalent series resistance (ESR)
• Parametric failure vs catastrophic failure (bulging/explosion)
• Heat and humidity accelerate aging process

Timeline of the Capacitor Plague

• Reports began late 2002, possibly mid-2002
• Gary Hedley (Utah repairman): replaced 40,000 leaky capacitors on 1,500 motherboards in one year starting summer 2002
• Also affected Mitsubishi TVs, JVC VCRs, Sony camcorders
• Carrie Holzman started posting online about Taiwan-made motherboard failures October 2002
• Affected brands: Abit, Asus, and others

The Rubicon Industrial Espionage Story

• Reported by Dennis Zogby in Passive Component Industry Magazine Sept-Oct 2002
• Material scientist left Japanese Rubicon Corporation for Taiwanese Luminous Town
• Scientist replicated Rubicon's P50 water-based electrolyte formula
• Staffers defected from Luminous Town with incomplete formula
• Missing additives caused hydrogen gas buildup and rupture
• Formula sold to 5-11 Taiwanese producers or electrolyte providers
• Luminous Town denied making bad electrolyte but didn't deny stealing from Rubicon

Industry Response and Affected Companies

• Failed capacitors bore unknown brands: Ta Choyo, Chushi, or unmarked
• Some showed Jackcon name, but company hadn't made motherboard capacitors in 2 years
• IBM acknowledged "minuscule" problem affecting <1% of computers
• Abit sued as early as 1999, settled and repaired boards
• Cost may have contributed to Abit's 2006 motherboard business exit

Electrolyte Company Accusations

• IEEE Spectrum named Leyang in Taoyuan as accused electrolyte buyer
• Leyang denied accusations, called it Japanese FUD to win back Taiwan business
• Luxon (major Taiwan supplier) blamed Leyang, emphasized in-house electrolyte development
• Electrolyte described as critical trade secret determining operating conditions

Technical Analysis of Failures

• 2004 University of Maryland study found missing depolarizer additive
• Depolarizers reduce gas generation within ecaps
• Missing depolarizer made electrolyte more alkaline than proper
• Aluminum oxide dielectric lacked phosphate ion protection
• Dielectric dissolved into alkaline electrolyte, thinning middle layer
• Caused unnaturally high capacitance (key bulging indicator)
• Exposed aluminum foil to reactions creating hydrogen gas

Skepticism About Single-Source Theory

• Author skeptical entire plague blamed on single Rubicon defector
• Believes extended series of unconnected industry challenges
• Xbox capacitor failures often blamed on plague but used different technology
• Xbox used PowerStor Aerogel super capacitor by Cooper Industries (American, carbon-based)
• Timeline inconsistencies: many failures continued years after 2002 incident

Later Capacitor Failures (2005-2007)

• Late 2005: Apple, HP/Compaq affected
• Dell most affected: May 2003-July 2005 shipped 11.8M Optiplex PCs with faulty capacitors
• Dell capacitors 10x more likely to bulge
• Dell sued in 2007, spent $300M on replacements
• Bad capacitors from single manufacturer: Nichon (Japan)
• Nichon products made by Taiwanese subcontractor
• 2002: Nichon claimed no Taiwan plants

Alternative Technical Explanation

• 2005: Industry scientists suggested water-based electrolytes problematic for high-speed microprocessors
• Low ESR aluminum ecaps with water-based electrolytes introduced late 1990s
• Early 2000s: Intel/AMD aggressively pushing single-core clock rates
• End of Dennard scaling: chips consuming more power, getting hotter
• Failed Dell Optiplex PCs ran hot Pentium 4 chips
• Theory: hot microprocessors heated capacitors until water-based electrolytes boiled
• Problem ended when AMD/Intel transitioned to multicore CPUs (2005) and capacitor makers improved formulations

Supply Chain and Counterfeit Issues

• Increasing supply chain complexity with outsourcing to cheapest suppliers
• Counterfeit capacitors during supply disruptions
• OEMs turn to unauthorized distributors when legitimate supply interrupted
• 2014 study of counterfeit Nichon ecaps after March 2011 earthquake
• Counterfeit electrolyte lacked sufficient ethylene glycol
• Lowered boiling point, made unstable at higher temperatures

Conclusion

• Author believes Rubicon story likely urban legend accompanying real technical issues
• Aluminum ecaps with water-based electrolytes still used today
• Vendors largely worked out problems over time
• Still offer best capacitance for size and price