PHILIPS 312278514990
Manual de Servicio

EN 18 5.6
5.6.1

5.

FTP2.2E AA

Service Modes, Error Codes, and Fault Finding
To get a quick diagnosis, this chassis has three service-modes implemented: � The Customer Service Mode (CSM). � The Service Default Mode (SDM). Start-up of the set in a predefined way. � The Service Alignment Mode (SAM). In this mode, items of the set can be adjusted via a menu. You can activate both SDM and SAM modes via the �service pads� on the SSB, via an RC-transmitter (DST or standard RC), or via ComPair. It is not possible to activate the SAM in �standby�; the TV has to be in �normal operation� mode. The �Protection Diagram� shows the structure of the protection system. See diagram below.

The Blinking LED Procedure
Introduction Via this procedure, you can make the contents of the error buffer visible via the front LED. This is especially useful for fault finding, when there is no picture. When the SDM is activated, the front LED will show (blink) the contents of the error-buffer. Error-codes > 10 are shown as follows: � A long blink of 750 ms (which is an indication of the decimal digit), � A pause of 1.5 s, � �n� short blinks (where �n� = 1 - 9), � When all the error-codes are displayed, the sequence finishes with a LED blink of 3 s, � The sequence starts again. Example: Error 12 9 6 0 0. After activation of the SDM, the front LED will show: � � � � � � 1 long blink of 750 ms (which is an indication of the decimal digit) followed by a pause of 1.5 s, 2 short blinks followed by a pause of 3 s, 9 short blinks followed by a pause of 3 s, 6 short blinks followed by a pause of 3 s, 1 long blink of 3 s to finish the sequence, The sequence starts again.

DC_PROT (from audio)

IRQ-DIGITAL (98)

+8V_CON

+8V SENSE (105)

+5V_CON

+5V SENSE (106)

OTC

TUNER FAST I2C BUS BLOCKED SLOW I2C BUS BLOCKED

Note: If errors 1, 6, or 18 occur, the LED always gives the last occurred error even if the set is NOT in service mode. 5.6.2 How to Activate Use one of the following methods: � Activate the SDM (only via soldering pads marked �SDM� on SSB). The blinking front LED will show the entire contents of the error buffer (this works in �normal operation� mode and in �protection� mode). � Transmit the commands �MUTE� - �062500� - �OK� with a normal RC. The complete error buffer is shown. Take notice that it takes some seconds before the blinking LED � starts. Transmit the commands �MUTE� - �06250x� - �OK� with a normal RC (where �x� is a number between 1 and 5). When x= 1 the last detected error is shown, x= 2 the second last error, etc.... Take notice that it takes some seconds before the blinking LED starts. � �DIAGNOSE X� with the DST (where �x� is a number between 1 and 5). When x= 1 the last detected error is shown, x= 2 the second last error, etc.... When x = 0 all errors are shown.

EPLD + FBX + 3D COMB

DC/DC PROTECTION

I2C

E_14650_032.eps 170604

Figure 5-7 Protection diagram There are several types of protections: � I2C related protections. � OTC related protections (via polling on I/O pins or via algorithms). � Hardware protection All protections are explained below. I2C Related Protections In normal operation, some registers of the I2C controlled ICs are refreshed every 200 ms. During this sequence, the I2C buses and the I2C ICs are checked. An I2C protection will take place if the SDA and SCL lines are short-circuited to ground, or to each other. An I2C error will also occur, if the power supply of the IC is missing. DC/DC protection: When a 3V3 supply is short-circuited, the DC/DC converter switches �off� and goes in protection. The FBX, EPLD IC, and 3D comb IC have no supply voltage and give no acknowledge. In this case, the set should go into protection. An error code is written in the NVM: DC/DC error. FBX protection: the FBX protection is not available any more. It is replaced by the DC/DC protection. 5.7.3 OTC Related Protections If a protection is detected at an OTC input, the OTC will start to scan all protection inputs every 200 ms for 5 times. If the protection on one of the inputs is still active after 1 s, the microprocessor will put the set in the protection mode. Before the scanning is started, a so-called �ESD refresh� is carried out. This is done, because the interrupt on one of the inputs is possibly caused either by a flash or by ESD. As a flash or ESD can influence IC settings, the HIP, MSP, 3D Comb and wireless module (not used in this set) are initialised again, to ensure the normal picture and sound conditions of the set.

5.7.2

5.7
5.7.1

Protections
Introduction This chassis has only one microprocessor (OTC), which remains active during Stand-by. This because power of the microprocessor and the attached memory chip set is coming from the 3V3 supply, which is derived from the 5V Stand-bycircuitry. Therefore, in both Power-on as in Stand-by mode, the microprocessor is connected to this power supply. If a fault situation is detected, an error code will be generated and if necessary, the set is put in protection mode. The protection mode is indicated by the blinking of the front LED at a frequency of 3 Hz (or by a coded blinking in special cases). The content of the error buffer can be read via the service menu (SAM), the blinking LED procedure or via DST/ComPair.