Toshiba Qosmio F50 Procedure1 Externaldeviceandconnectioncheck, Procedure2 Replacesystemboard

2￿Troubleshooting￿Procedures￿

To￿determine￿if￿the￿computer’s￿external￿USB￿devices￿are￿functioning￿properly,￿perform￿the￿ following￿procedures.￿Figure￿2-6￿outlines￿the￿process.￿Start￿with￿Procedure￿1￿and￿continue￿as￿instructed.￿

Procedure￿1:￿ External￿device￿and￿connection￿check￿

Procedure￿2:￿ Replace￿system￿board￿

Procedure￿1￿ External￿device￿and￿connection￿check￿

The￿USB￿device￿may￿be￿damaged￿or￿the￿connection￿may￿be￿faulty.￿￿Use￿windows￿application￿ to￿check￿device￿can￿work￿fine￿or￿not,￿Perform￿Check￿1.￿

Check￿1￿ Make￿sure￿USB￿device￿cable￿is￿firmly￿plugged￿into￿one￿of￿the￿USB￿sockets.￿If￿the￿ cable￿is￿connected￿correctly,￿go￿to￿Check￿2.￿

Check￿2￿ Plug￿the￿USB￿device￿into￿another￿USB￿socket￿(there￿are￿three￿in￿all).￿If￿the￿USB￿ device￿still￿does￿not￿work,￿go￿to￿Check￿4.￿

If￿the￿device￿functions￿correctly￿when￿connected￿to￿another￿USB￿port,￿go￿to￿ Check￿3.￿

Check￿3￿ Make￿sure￿that￿the￿USB￿socket￿is￿firmly￿secured￿to￿the￿system￿board￿of￿the￿ computer.￿If￿the￿malfunction￿remains,￿the￿system￿board￿or￿USB￿small￿board￿may￿ be￿damaged.￿Go￿to￿Procedure￿2.￿

Check￿4￿ Connect￿an￿alternative￿USB￿device￿to￿one￿of￿the￿computer’s￿USB￿ports,￿and￿then￿ boot￿the￿computer.￿The￿computer￿automatically￿detects￿the￿external￿device.￿

If￿the￿alternative￿USB￿device￿works￿correctly,￿the￿original￿device￿may￿be￿ damaged￿and￿should￿be￿replaced.￿

If￿the￿alternative￿USB￿device￿appears￿to￿have￿the￿same￿problem￿as￿the￿original￿ device,￿the￿system￿board￿or￿USB￿small￿board￿may￿be￿damaged.￿Go￿to￿Procedure￿ 2.￿

Procedure￿2￿ Replace￿system￿board￿

If￿the￿error￿persists,￿the￿system￿board￿or￿USB￿small￿board￿may￿be￿damaged.￿Replace￿it￿with￿a￿ new￿one￿following￿the￿instructions￿in￿Chapter￿4.￿

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QOSMIO￿F50-￿QOSMIO￿F55-￿DYNABOOK￿QOSMIO￿F50￿Series￿Maintenance￿Manual￿ ￿

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿20￿