Philips BJ2.4U Service Manual

Service Modes, Error Codes, and Fault FindingEN 20 BJ2.4U/BJ2.5U PA5.Figure 5-6 “Off” to “Semi Stand-by” flowchart (part 1)All I/O lines have a “high” default state:- Assert the Viper reset.- Sound-Enable and Reset-Audio should remain “high”.- NVM power line is “high”, no NVM communication possible.OffStandby Supply starts running.+5V2, 1V2Stb, 3V3Stb and +2V5D become present.In case of PDP 3V3 Vpr to CPU PDP becomes present.st-by μP resetsStand-by orProtectionMains is applied- Switch Sound-Enable and Reset-Audio “high”.They are “low” in the standby mode if thestandby mode lasted longer than 2s.Enable the +1V2 supply (ENABLE-1V2)detect-5Vreceived within2900 ms after POD-MODEtoggle?NoYesactivate +5V supply detection algorithm+12V errordetect-12VSW received within2900 ms after POD-modetoggle?NoSPactivate +12VSW supplydetection algorithmYes+5V, +8V6, +12VS, +12VSW and Vsound are switched onSwitch “on” all supplies by switching LOW the POD-MODEand the ON-MODE I/O lines.Initialise I/O pins of the st-by μP, start keyboard scanning, RCdetection, P50 decoding. Wake up reasons are “off”.If the protection state was left by short circuiting theSDM pins, detection of a protection condition duringstartup will stall the startup. Protection conditions in aplaying set will be ignored. The protection mode willnot be entered.In case of FHP PDP: Switch PDPGO “low”CPUGO (inverse of the stby I/O line POD-MODE) and PDPGOare then both “low” and the PDP is in the “low power” mode.Switching the POD-MODElow in an FHP PDP setmakes the CPUGO go “high”and starts the PDP CPU.except in an FHP PDP ColdBootFHP PDP Set?Switch PDPGO high:PDP should start: 5V, 8V6 and12V are activatedYesNo+5V errordetect-5Vreceived within2900 ms after PDPGOtoggle?NoSPSPYesSwitching the PDPGO “high”will give a visual artefact andshould only be done if reallynecessary.Switching the POD-MODE and the“on” mode “low” in anSDI PDP setmakes the PDP supplies go to the“on” mode.Within 4 seconds, avalid LVDS must be sent to thedisplay to prevent protection.(valid for V3 version)Wait 50ms and then start polling the detect-5V, detect-8V6 and detect-12V every 40ms.The availability of the supplies is checked through detect signals (delivered bydedicated detect-IC's) going to the st-by μP. These signals are available for+12V, +8V6, +5V, +1V2 and +2V5. A low to high transition of the signals shouldoccur within a certain time after toggling the standby line. If an observers isdetected before the time-out elapses, of course, the process should continue inorder to minimize start up time.Start polling the detect-1V2 every 40msSwitch “low” the NVM power reset line. Add a 2ms delaybefore trying to address the NVM to allow correct NVMinitialization.+8V6 errordetect-8V6 receivedwithin 6300 ms after POD-mode toggle?Startup shall not wait for this detectionand continue startup.NoSPNo need to wait for the 8V6 detection at this point.activate +8V6 supplydetection algorithmYesreturnECO Baby Jaguar?? Auto ProtectionLine High??Audio ErrorYes YesNoF_15400_096a.eps230606To part B To part Bautonomous actionaction holder: St-byaction holder: MIPSOnly applicable for sets with CableCARDTM slot (POD)***** **