PHILIPS AA5 (AA) Chassis

Recommended Safety Parts

Item Part No.

051 20008

Description

1ohm 5% 0.33W 10 ohms 5% 0.33W 5 ohms 6 5% 0.5W 1ohm 5% 0.33W 1ohm 5% 0.33W 4 ohms 7 5% 0.33W 10 ohms 5% 0.5W 1k 5% 0.5W 4 ohms 7 5% 0.33W 8 ohms 2 5% 0.33W PTC/PTC/36 ohms / 265V 4M7 5% 0.5W 4M7 5% 0.5W 4 ohms 7 1% 0.6W 47k 1% 0.6W 1 ohm 5% 0.33W 1k8 1% 0.6W 68 ohm 5% 2W 270 ohms 5% 2W 4k7 5% 0.1W 10k 2% 0.25W 10uH10% Line output transformer AT2079/40 10uH 10% Linearity coil AT4042/92 10uH 10% Mains filter 2.2kH 20% 10uH 10% 10uH 10% 1N4148 1N4148 1N4148 1N5061 1N5061 1N5061 1N5061 1N4148 BYD74G 1N4148 TLXR5400 LED 1N4148 BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B CQY80NG BC337 BC558B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC848B BC337 BC337 BC848B BC848B BC848B BC848B BC848B BC848B Holder valve mini neck 22nF 10% 63V 100 ohm 5% 0.33W 1ohm 5% 0.33W BC848B BC848B BC848B Holder valve narrow neck 500mA fuse 1 A fuse 100 ohm 5% 0.33W BC848B BC558B BC848B BC848B

41982 41982

Fuse holder Mains switch 2 pins male for degeussing 2 pins male for mains 21 pins euroconnector UV915E/IEC UV913/IEC U943C/IEC UV917/IEC 3.15 A fuse 800 mA fuse 250 mA fuse 100uF 20% 25V 4.7nF 10% 63V 4.7nF 10% 63V 4.7nF 10% 63V 22nF 10% 63V 4.7nF 10% 63V 4.7nF 10% 63V 22nF 10% 63V 10nF 20% 50V 100uF 20% 25V 1nF 10% 50V 4.7nF 10% 63V 10nF 20% 50V 4.7nF 10% 63V 10nF 20% 50V 22nF 10% 63V 10nE 20% 50V 22nF10% 63V 1nF l0% 50V 1nF 10% 50V 10nF 20%50V 10nF 20%50V 10nF 20% 50V 4.7nF 10% 63V 10nF 20% 50V 4.7nF 10% 63V 22nF 10% 63V 820pF 10% 2KV 1.2nF 10% 2KV 8.2nF 5% 1.6KV 12uF 5% 1.6KV 47uF 200V 330nF 5% 250V 680nF 10% 250V 470nF 10% 250V 2.2nF 10% 1KV 2.2nF 10% 1KV 68kF 20% 385V 3.3nF 20% 400V 2.2nF 10% 1KV 1nF 10% 1KV 10nF 50V 47kF 200V 1.5nF 10%1KV 1nF 10% 1KV 1nF 10% 50V 4.7nF 10% 63V 4.7nF 10% 63V 100uF 20% 25V 22nF 10% 63V 10nF 20% 50V 47uF 20% 25V 47uF 20% 25V 4.7nF 10% 63V 10 ohms 5% 0.33W 22 ohms 5% 0.33W 3 ohms 5% 0.33W 75 ohms 5% 0.125W Jumper 120 ohms 5% 0.1W 10 ohms 5% 0.33W 4k7 2% 0.25W 75 ohms 35% 0.125W 10k 2% 0.25W 10k 2% 0.25W Jumper 22 ohms 5% 0.5W 47 ohms 5% 0.5W 10 ohms 5% 0.5W 2k2 5% 0.33W 68 ohms 5% 1W 2 ohms 2 5% 0.33W 2 ohms 7 5% 0.33W 3 ohms 3 5% 0.33W 4 ohms 7 5% 0.33W 2 ohms 2 5% 0.33W 3 ohms 3 5% 0.33W 1k8 1% 0.6W 1k8 1% 0.6W Jumper
2. For 4 page teletext execution the possibility to store 4 pages: - 1 display memory; for the page displayed on Description diagram E the TV screen Teletext - 3 background memories; for reducing the waiting time There are 2 different executions for teletext - the content of the 3 background memories processing; a 1 page TXT execution by teletext depends on the teletext system. Dedecoder IC7700 only or a 4 page TXT execution pending on the transmission the teletext by teletext decoder 107700 and extra microdecoder selects one of the following possibiliprocessor IC7702: ties: * WST: page -1, page +1, page +2 * 1 page TXT by teletext decoder IC7700; * FLOF: 3 pages coupled to the coloured ROFor the 1 page teletext execution a 40 pins buttons (red/green/yellow) SAA5254 VT 1.1 (VIP + ECCT + 1 k RAM * TOP: next group, next page and basic top memory) teletext decoder is used with built-in 1k table RAM memory. This teletext decoder makes use of the central microprocessor 107600 and is The main functions of both IVT teletext controlled via the 120 bus (at pins 24-25 decoders: 107700). 1. Analogue part for: * 4 page TXT by teletext decoder IC7700 and * Sync-separation extra microprocessor IC7702; * Teletext data extraction For the 4 page teletext execution a 48 pins * Data clock regeneration SAA5281 VT 1.8 (VIP + ECOT +4k RAM * Transfer of clock, data and composite sync memory) teletext decoder with 4k built-in RAM signals to the digital part and an extra C IC7702 is used. This C is a 2. The sync-separator slicing level is adaptive so slave of the master C IC7600 and controls the that it can operate with a range of video extra featuring of WST, TOP and FLOE. amplitudes and signal distortions In both cases: 3. The data-slicer uses an adaptive signal *CVBS-TXT signal is coming from the CVBSrecognition and clock-phasing algorithm so INT or CVBS-EXT (see IC7140 source select), that it can operate with a wide range of clock so teletext from both the antenna-signal and run-in amplitudes from pin 20 of the scart can be displayed. 4. Digital part for decoding of the world teletext * Peaking filter C2736, L5734, R3734 and standards R3755 is only present in scandinavian sets and * On board 4 pages memory (for 4 page teletext is used for peaking filter. execution only) * RGB teletext info (R-TXT, B-TXT and G-TXT) * Automatic detection of WST, FLOF or TOP is directly fed to the video controller IC7015-60 * Packet 26 flicker free character processing on diagram D). * The fast blanking signal from teletext (FBL Teletext TXT) is added to all other fast blanking signals (see diagram A). The total FAST BLANKING signal is used for blanking and source select control of IC7015-6D. * NIL (Non Inter Lace) signal is fed to the frame amplifier to switch the frame to 25Hz non interlaced mode which is needed for teletext displaying. * CONTRAST signal is used to set a minimal level of contrast in TXT mode. * Supply voltages +50 and +50 supply the teletext processing. These supply voltages are derived from the +8T coming from the LOT. In both cases 1 page and 4 page execution, the teletext concept is of the so called VT type; this means that the VIP and CCT are combined in one VT teletext decoder.

Teletext Adjustments

1.4 Vertical centring Can be adjusted by eventually mounting one of the resistors R3401 and/or R3408. 1.5 Focusing Is adjusted with the focusing potentiometer in the line output transformer. 1.6 IF filter (only for sets with SECAM LL reception possibility): Connect a signal generator (e.g. PM5326) via a capacitor of 5p6 to pin 17 of the tuner and adjust the frequency for 40.4 MHz. Connect an oscilloscope to pin 1 of filter 1015. Switch on the set and select system Europe (BG/L is low for BGIDK reception). Adjust L5012 for a minimum amplitude. 1.7 AFC a. For sets with SECAM LL reception possibility: Connect a signal generator (e.g. PM5326) as indicated in point 1.6. Connect a voltmeter to pin 44 of IC7015/6A. Adjust the frequency for 33.9 MHz and select system France (L/L is high for L reception). Adjust L5040 for 3V5 (DC). Next adjust the frequency for 38.9 MHz and select system Europe (L/L is low for BGIDK reception). Adjust L5043 for 3V5 (DC). b. For sets without SECAM LL reception possibility: Connect a signal generator (e.g. PM5326) as indicated above and adjust the frequency for 38.9 MHz (for PAL I at 39.5 MHz). Connect a voltmeter to pin 44 of IC7015/6A. Adjust L5040 for 3V5 (DC). 1.8 RF AGC If the picture of a strong local transmitter is reproduced distorted, adjust potentiometer R3021 until the picture is undistorted. Or: Connect a pattern generator (e.g. PM5518) to the aerial input with RE signal amplitude =1 mV. Connect a multimeter (DC) at pin 5 of tuner. Adjust R3021 so that voltage at pin 5 of tuner is 7V5 0V5 (DC). 2. Adjustments on the CRT panel (Fig. 7.2) 2.1 Vg2 cut-off points of picture tube Apply a pattern generator (e.g PM551 8) and set it to a white raster pattern. Adjust contrast and Vg2 at minimum (Vg2 with potentiometer in line output transformer to the left). Adjust brightness until the DC voltage across potentiometer 3213 is 0V. Adjust R3207 (B), R3220 (G) and R3234 (R) for a level of 115V on the collectors of transistors 7205, 7218 and 7227 (resp R3264 (B), R3274 (G) and R3302 (R) and T57265-7275-7285 for 20 narrow neck). Adjust Vg2 potentiometer until the gun that first emits light is just no longer visible. Adjust the two other guns with the respective controls (3207, 3220 or 3234 or for 20 3264, 3274 or 3302 for 20) until just no light will be visible. 2.2 Grey scale (white D) Apply a test pattern signal and adjust the set for normal operation. Allow the set to warm up for about 10 minutes. Adjust R3213 and R3214 (R3263 and R3273 for 20) until the desired grey scale has been obtained.
Main carrier (component side)
CRT panel mini neck 14-15-17-21

CRT panel narrow neck 20

Repair facilities
Functional blocks On both the service printing on the copper and the component side, functional blocks are indicated by a line and text. Test points The AA5 chassis is equipped with test points in the service printing on both sides of monoboard. These test points are referring to the functional blocks as mentioned above: P1-P2-P3, etc: Test points for the power supply L1-L2-L3, etc: Test points for the line drive and line output circuitry E1-E2-E3, etc: Test points for the frame drive and frame output circuitry S1-S2-S3, etc: Test points for the synchronisation circuitry V1-V2-V3, etc: Test points for the video processing circuitry A1-A2-A3, etc: Test points for the audio processing circuitry C1-C2-C3, etc: Test points for the control circuitry T1-T2-T3, etc: Test points for the teletext processing circuitry The numbering is done in a for diagnostics logical sequence; always start diagnosing within a functional block in the sequence of the relevant test points for that functional block.

General specification for both IVT decoders: 1. Suitable for processing the following teletext signals: - the World System Teletext (WST) - the UK page choice system; FLOF (Full Level One Feature) The teletext page is extended with a status line which gives information about pages coupled by the transmitter to the coloured RO-buttons (FastText) - the german choice system; TOP (Table Of Pages) the teletext page is extended with a status line which gives information about the 1. Adjustments on the main panel (Fig. 7.1) next information block and group.

Electrical Adjustments

1.1 +100V power supply voltage Connect a voltmeter (DC) across C2530. Adjust R3535 for a voltage of +100V (14 to 17) or +92V5 for 20-21 at a black picture (beam current 0 mA). 1.2 Horizontal centring Is adjusted with potentiometer R3354. 1.3 Picture height Is adjusted with potentiometer R3410.
Teletext Diagram / Electrical Adjustments / Safety Parts / Repair Facilities / Repair Facilities Contd / CRT PCB (20 narrow neck) Power Supply Diagram / Control Diagram / Video Audio CRT 14/15/17/21 mini neck Diagram / Teletext Diagram / Tuner IF Diagram

Repair facilities Contd

Service default mode (SDM) The service default mode is a pre-defined mode which can be used when for faultfinding (especially when the TV gives no picture at all). All oscillograms and DC voltages in this service manual are measured in the service default mode. Entering the service default mode can be done in 2 ways: 1. By short-circuiting the service pins Si and S2 of the microcomputer (pin 7 of 107600) while switching on the set with the mains switch 2. From normal operation mode by pressing the button DEFAULT on the DST (Dealer Service Tool) RC7150. Leaving the service default mode to normal operation can only be done by the stand-by on the remote control (so not via mains switch off; after mains switch off and then on again the set will start up in the Service Default Mode again to enable easy faultfinding). Functions of the service default mode (see Fig 8.1): 1. All analog settings (volume, contrast, brightness and saturation) are in the mid position (in iC with Vi.0 the volume in the SDM is set at 25%, from Vi.1 onwards the volume in the SDM is set at 50%). 2. For VST sets are to program number 1 indicated in the right top corner 3. For PLL sets are tuned to 475.25 MHz 4. Delta volume settings are not used (delta volume setting per program in reference with the PP volume setting which is valid for all programs) 5. OSD error message (present available error code) is displayed continuously 6. Store open and store close commands will act as search and auto store 7. Automatic switch off function (set switches off after 15 minutes no DENT) will be switched off 8. Hotel mode will be disabled 9. All other functions remain normal controllable 10.A counter in the middle of the screen indicate the normal operation hours of the set in a hexadecimal code (every time the set is switched on the counter is incremented by 1 hour, so +i at the counter). 11. An S in the middle of the screen (next to the counter) indicate that the set is in the service default mode For reading a new option setting, the set must be switched on by the mains switch (so not by stand-by as by then the EEPROM settings are not read). Functions of the service menu (see Fig 8.2); 1. Software version of the microprocessor used in that typical set is displayed in the right top corner 2. A counter in the middle of the screen indicate the normal operation hours of the set in a hexadecimal code (every time the set is switched on the counter is incremented by i hour, so+1 at the counter). 3. The S in the middle of the screen next to the counter indicate that the set is in the service default mode 4. Error code history; The 5 last different error codes occurred are stored in the EEPROM memory; last error code detected will be displayed on the right side (see for an overview of all possible error codes Fig. 8.4), 50 e.g.: 00000 means no error codes present in the buffer 00003 means one error code present in the buffer; error code means two error codes present in the buffer; last detected error code is error code 2, previous detected error code is error code 3 The error code history buffer is cleared as soon as the Service Menu is left by the stand-by command. In case the Service Menu is left by the mains switch off the error code history buffer will not be cleared. Counter + S for SM active + software version Error code history Option setting bar

Text displayed in the upper option row in the service menu SINGLE SYSTEM I SYSTEM BG+L SYSTEM BG+L+l PLL TUNER NO TXT 1P TXT 4P TXT 16/9 SWITCH S-VIDEO SCART
switching on the set from stand-by mode). The following table indicates the possible options and there technical consequences:
In case the N or Y blinks, it can be changed NN NY YN YY N Y NN NY YN N Y N Y N Y The technical consequence for the selected option
Hotel mode * Hotel mode on The hotel is activated when pressing simultaneously the MENU button on the local keyboard and the SLEEPTIMER or OSD button on the remote control while program 38 is selected for at least 3 seconds. When the hotel mode is activated, this is indicated by a H+ on the OSD (this will be displayed until the set is switched of by the mains switch or via stand-by). * Hotel mode off Repeat above mentioned procedure once again. When the hotel mode is de-activated, this is indicated by a H- on the OSD (this will * -

SHARPNESS LOCAL MENU

N Y N Y N Y N Y N Y
40 PROGRAMS SLEEPTIMER FOR GERMANY ONLY
For a PAL BG only set For a PAL I only set For a PAL BG + SECAM LL set For a PAL BGI or PAL EGOKI + SECAM LL set For a VST tuner set For a PLL tuner set For a set without teletext For a set with 1 page WST teletext For a set with 4 page FLOF teletext Disable 16/9 switching possibility Enable 16/9 switching possibility For a set without SVHS connectors For a set with SVHS connectors For a set without a scart connector For a set with a scart connector Note: The SCART option can only be changed when the S-VIDEO option is N Disable sharpness control Enable sharpness control No ring menu after pressing MENU on the local keyboard Ring menu after pressing MENU on the local keyboard 70 programs can be stored 40 programs can be stored Disable sleeptimer function Enable sleeptimer function Disable ATS function Enable ATS function only works when ATS software is present)
be displayed until the set is switched of by the mains switch or via stand-by). Functions of the hotel mode The volume present on the moment the hotel mode was switched on is the maximum volume level in the hotel mode. The install mode can not be opened (the message LOCKED will be displayed for 3 seconds if a store open command is given). The delta volume menu can not be entered. PP (personal preference) can not be stored (the message LOCKED will be displayed for 3 seconds if a PP-store command is given). At switch on (by mains switch or remote control) program number 1 will always be selected.

CRT PCB (20narrow neck) Diagram
Fig. 8.3 Error messages The microcomputer also detects errors in circuits connected to the I ~ (Inter IC) bus. These error messages are communicated via OSD (On Screen Display) and a flashing LED both in normal operation and in the service menu (error code history buffer): 1. In normal operation; In normal operation both the OSD error message and the LED error indication will display the present detected error. The displaying of both the OSD and the LED error indication will only take a limited time. 2. In the service default mode; In the service default mode both the OSD error message and the LED error indication will display the present detected error. In the service default mode both the OSD and the LED error indication will be displayed permanently. 3. In the service menu; In the service menu both the OSD error number (in the error code history) and the LED error indication will display the present detected error. In the service default mode both the OSD and the LED error indication will be displayed continuously. Reset volume/program (delta volume) for all programs at once It is also possible to leave the service menu with the MENU button. After one time pressing the MENU button in the service menu, a new menu is entered (see Fig. 8.5) in which the volume/ programs-settings (also called delta volume settings) of nil. programs can be deleted. In case YES is selected via the MENU+ button, all volume/program-settings are deleted at once. After another time pressing the MENU button the TV will switch to normal operation (when the service menu is entered via the pins Si and S2) or service default mode (when the service menu is entered with the DST). Counter +S for SM active + software version Error code history Reset all volume 0023 S 1.0

0023 S

00032 - SYSTEM BG+l + YNNYYNNNYYYN Fig. 8.2
5. Option setting; The options of the set can be changed in the service menu. In the 2 bottom lines the options are given. Control of the options is with the following keys on the remote control: * PROGRAM +/ -
00032 - RESET VOL/PROG + NO Fig. 8.5 YES
Counter + 5 for SDM active + prog nr.
Fig. 8.1 Service Menu (SM) Entering the service menu can be done in 2 ways: 1. From service default mode by simultaneously pressing the buttons - and + buttons on the local keyboard. 2. From normal operation mode by pressing the button ALIGN on the DST RC7150. Leaving the service menu to normal operation can be done in 2 ways: 1. Via the stand-by on the remote control 2. Via mains switch off
Select the option to be changed; Via the PROGRAM +/- button to option to be changed can be selected by scrolling through the possible options in the upper row from left to right (via the PROGRAM + button) or from right to left (via the PROGRAM - button). The selected option will be displayed in the upper row, the present Y or N status of that option (see table 8.3) will be blinking in the bottom row (when arrived at the end of the row the scrolling will be continued at the other side). * MENU +/Change the selected option via MENU +/- buttons the selected option can be changed. The selected Y (yes) or N (no) blinks and via either MENU + or the MENU you toggle through the Y or N possibility. The options (both the changed and the notchanged options) are stored in the EEPROM as soon as the service menu is left (by stand-by or mains switch off). The new option settings are only read after mains switch on (so not after