Pioneer PDP-5020FD Service Manual

Contents

49PDP-5020FD5 6 7 85 6 7 8ABCDEF5.2 DIAGNOSIS FLOWCHART OF FAILURE ANALYSISFlowchart of Failure Analysis for The Whole UnitSTARTIs the STB LED lit? Is STB 3.4 V power supplied?(Check the power at the IF micro-computer on the MAIN Assy.)Can the unit be turned on(Relay ON)?Is the panel arbitrary turned on oroff repeatedly? Or do luminescentspots appear on the screen?A shutdown occurs. See "5.4 DIAGNOSIS OF SD (SHUTDOWN)."Are the voltages at AC_DET andMSW_DET on the POWERSUPPLY Unit high?Replace the POWER SUPPLYUnit.Check if the cable that connectsthe POWER SUPPLY and MAINAssys is firmly connected.In the power startup, the Main microcomputercontrols a relay port earlier than modulemicrocomputer.• Check the DRF SW.• Before turning the drive off with the RS-232Ccommands or using the remote control unit,turn the unit off.In a case where luminescent spots appearor the panel is repeatedly turned on or off.In a case where luminescent spots appear.(*1): As reset lighting of the 9th-generation panel is faint,reduce the ambient lighting when checking the display.Is the voltage at the RELAY portof the connectors between theDIGITAL Assy and POWERSUPPLY Unit H (3.4 V)?NoNoIs the drive off? Turn the drive on.NoYesYesYesA shutdown occurs. See "5.4 DIAGNOSIS OF SD (SHUTDOWN)."YesA power-down occurs.Does the screen display resetlighting? (*1)See "5.3 DIAGNOSIS OF PD (POWER-DOWN)."YesWhen the panel drive-power is in OFF state, there will be no PD,except PS_PD.When the panel drive-power is in OFF state, there will be no PD,except PS_PD.A power-down occurs. See "5.3 DIAGNOSIS OF PD (POWER-DOWN)."YesNoNoYesNoNGNoYesYesYesYesNoNoYesNoNoNoYesProblems concerning STB statusNote: Check that the Main power SW is ON side.Problems concerning the powerProblems concerning lighting of the panelFailure analysis for theMAIN Assy => MA1Failure analysis for theMAIN Assy => MA2Failure analysis for thePOWER SUPPLY Unit => PS1Failure analysis for thePOWER SUPPLY Unit => PS2Failure analysis for thePOWER SUPPLY Unit => PS3Failure analysis for thedrive system => DR1Failure analysis for thedrive system => DR2AThe green/red LEDs on the DIGITAL Assy indicate ON/STBof the panel and causes for a power-down or shutdown.If neither the green nor red LED lights, it is likely that thepower to the STB system is not supplied. (failure, PASV-STB status)If AC_DET or MSW_DET is Low, LED goes off.[1] WHOLE UNIT