Philips BJ2.4U Service Manual

Service Modes, Error Codes, and Fault FindingEN 14 BJ2.4U/BJ2.5U PA5.5. Service Modes, Error Codes, and Fault FindingIndex of this chapter:5.1 Test Points5.2 Service Modes5.3 Stepwise Start-up5.4 Service Tools5.5 Error Codes5.6 The Blinking LED Procedure5.7 Protections5.8 Fault Finding and Repair Tips5.9 Software Upgrading5.1 Test PointsAs most signals are digital, it will be almost impossible tomeasure waveforms with a standard oscilloscope. Therefore,waveforms are not given in this manual. Several key ICs arecapable of generating test patterns, which can be controlled viaComPair. In this way it is possible to determine which part isdefective.Perform measurements under the following conditions:• Service Default Mode.• Video: Color bar signal.• Audio: 3 kHz left, 1 kHz right.5.2 Service ModesService Default Mode (SDM) and Service Alignment Mode(SAM) offer several features for the service technician, whilethe Customer Service Mode (CSM) is used for communicationbetween a Customer Helpdesk and a customer.There is also the option of using ComPair, a hardware interfacebetween a computer (see requirements below) and the TVchassis. It offers the ability of structured troubleshooting, testpattern generation, error code reading, software versionreadout, and software upgrading.Minimum requirements for ComPair: a Pentium processor,Windows 95/98, and a CD-ROM drive (see also paragraph“ComPair”).5.2.1 Service Default Mode (SDM)Purpose• To create a pre-defined setting, to get the samemeasurement results as given in this manual.• To override SW protections (only applicable for protectionsdetected by stand-by processor) and make the TV start upto the step just before protection (a sort of automaticstepwise start up). See paragraph “Stepwise Start Up”.• To start the blinking LED procedure (not valid in protectionmode).SpecificationsTable 5-1 SDM default settings• Tuning frequency 61.25 MHz for NTSC: The TV shall tuneto physical channel 3 only if channel 3 is an analog channelor if there is no channel 3 installed in the channel map. Ifthere is a digital channel installed in channel 3, then thefrequency to which the set will tune, would be as specifiedin the channel map and could be different from the onecorresponding to the physical channel 3.• All picture settings at 50% (brightness, color, contrast).• All sound settings at 50%, except volume at 25%.• All service-unfriendly modes (if present) are disabled, like:– (Sleep) timer.– Child/parental lock.– Picture mute (blue mute or black mute).– Automatic volume levelling (AVL).– Auto switch "off" (when no video signal was receivedfor 10 minutes).– Skip/blank of non-favorite pre-sets.– Smart modes.– Auto store of personal presets.– Auto user menu time-out.How to Activate SDMUse one of the following methods:• Use the standard RC-transmitter and key in the code“062596”, directly followed by the “MENU” button.Note: It is possible that, together with the SDM, the mainmenu will appear. To switch it "off", push the “MENU”button again.• Short for a moment the two solder pads [1] on the SSB,with the indication “SDM”. They are located outside theshielding. Activation can be performed in all modes, exceptwhen the set has a problem with the Stand-by Processor.See figure “SDM service pads”.Figure 5-1 SDM service padsAfter activating this mode, “SDM” will appear in the upper rightcorner of the screen (if you have picture).How to NavigateWhen you press the “MENU” button on the RC transmitter, theset will toggle between the SDM and the normal user menu(with the SDM mode still active in the background).How to Exit SDMUse one of the following methods:• Switch the set to STAND-BY via the RC-transmitter.• Via a standard customer RC-transmitter: key in “00”-sequence.Region Freq. (MHz)DefaultsystemEurope, AP-PAL/Multi 475.25 PAL B/GNAFTA, AP-NTSC, LATAM 61.25 (ch. 3) NTSC MG_15930_084.eps1906061