Philips BJ2.4U Service Manual

Service Modes, Error Codes, and Fault Finding EN 35BJ2.4U/BJ2.5U PA 5.5.5 Error Codes5.5.1 IntroductionThe error code buffer contains all detected errors since the lasttime the buffer was erased. The buffer is written from left toright, new errors are logged at the left side, and all other errorsshift one position to the right.When an error has occurred, the error is added to the list oferrors, provided the list is not full or the error is a protectionerror.When an error occurs and the error buffer is full, then the newerror is not added, and the error buffer stays intact (history ismaintained), except when the error is a protection error.To prevent that an occasional error stays in the list forever, theerror is removed from the list after 50+ operation hours.When multiple errors occur (errors occurred within a short timespan), there is a high probability that there is some relationbetween them.Basically there are three kinds of errors:• Errors detected by the Stand-by Processor. Theseerrors will always lead to protection and an automatic startof the blinking LED for the concerned error (see paragraph“The Blinking LED Procedure”). In these cases SDM canbe used to start up (see chapter “Stepwise Start-up”).• Errors detected by VIPER that lead to protection. In thiscase the TV will go to protection and the front LED will blinkat 3 Hz. Further diagnosis via service modes is not possiblehere (see also paragraph “Error Codes” -> “Error Buffer” -> “Extra Info”).• Errors detected by VIPER that do not lead toprotection. In this case the error can be read out viaComPair, via blinking LED method, or in case you havepicture, via SAM.5.5.2 How to Read the Error BufferUse one of the following methods:• On screen via the SAM (only if you have a picture). E.g.:– 00 00 00 00 00: No errors detected– 06 00 00 00 00: Error code 6 is the last and onlydetected error– 09 06 00 00 00: Error code 6 was first detected anderror code 9 is the last detected error• Via the blinking LED procedure (when you have nopicture). See next paragraph.• Via ComPair.5.5.3 How to Clear the Error BufferUse one of the following methods:• By activation of the “RESET ERROR BUFFER” commandin the SAM menu.• With a normal RC, key in sequence “MUTE” followed by“062599” and “OK”.• If the content of the error buffer has not changed for 50+hours, it resets automatically.5.5.4 Error BufferIn case of non-intermittent faults, clear the error buffer beforeyou begin the repair (before clearing the buffer, write down thecontent, as this history can give you significant information).This to ensure that old error codes are no longer present.If possible, check the entire contents of the error buffer. Insome situations, an error code is only the result of another errorcode and not the actual cause (e.g., a fault in the protectiondetection circuitry can also lead to a protection).There are several mechanisms of error detection:• Via error bits in the status registers of ICs.• Via polling on I/O pins going to the stand-by processor.• Via sensing of analogue values on the stand-by processor.• Via a “not acknowledge” of an I2 C communicationTake notice that some errors need more than 90 secondsbefore they start blinking. So in case of problems wait 2minutes from start-up onwards, and then check if the front LEDis blinking.Table 5-2 Error code overviewError Description Error/Prot Detected by Device Defective module Result1 I2 C1 P VIPER n.a. I2 C1_blocked Protection + 3 Hz blinking2 I2 C2 P VIPER n.a. I2 C2_blocked Protection + 3 Hz blinking3 I2 C3 P Stby μP n.a. / Protection + Error blinking4 I2 C4 P VIPER n.a. I2 C4_blocked Protection + 3 Hz blinking5 VIPER does not boot P Stby μP PNX8550 / Protection + Error blinking6 5V supply P Stby μP n.a. / Protection + Error blinking7 8V6 supply P Stby μP n.a. / Protection + Error blinking8 1.2V DC/DC P Stby μP n.a. / Protection + Error blinking11 3.3V DC/DC P Stby μP n.a. / Protection + Error blinking12 12V supply P Stby μP n.a. / Protection + Error blinking14 Audio P Stby μP / / Protection + Error blinking16 MPIF1 main supply E VIPER / / see extra info17 MPIF1 audio supply E VIPER / / see extra info18 MPIF1 ref freq E VIPER PNX3000 IF I/O Error logged25 Supply fault P Stby μP / Protection + Error blinking27 PNX2015 HD subsystem part E VIPER / / see extra info29 AVIP 1 E VIPER / / see extra info31 AVIP 2 E VIPER / / see extra info32 MPIF1 E VIPER PNX3000 / Error logged34 Tuner1 E VIPER / Tuner 1 Error logged37 Channel decoder E VIPER NXT2003 / Error logged39 POD Interface E VIPER STV701 / Error logged43 Hi Rate Front End E VIPER TDA9975 HDMI Error logged44 Main NVM E VIPER M24C64 / Error logged45 Columbus 1 E VIPER PNX2015 Comb filter Error logged46 Pacific 3 E VIPER / / TV to stand-by + Error logged53 VIPER P Stby μP PNX8550 / Protection + Error blinking63 PDP Display (n.a.) P VIPER / Display Protection + 3 Hz blinking