Colour TV Service Manual
Model: 21WHS3/BN Chassis: UOC-TDA9381 Model No: 21WHS3-Bn Version 1.
CONTENTS SAFETY NOTICE ................................................................................................................................... 4 GENERAL DESCRIPTION .................................................................................................................... 6 TECHNICAL SPECIFICATION ............................................................................................................. 7 GENERAL SPECIFICATION .......................................................
SAFETY NOTICE WARNING: BEFORE EXAMINING AND SERVICING THIS CHASSIS, READ CAREFULLY THE FOLLOWING SAFETY INSTRUCTIONS. X-RAY RADIATION PRECAUTION 1. The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X-RADIATION.
4. When replacing a burnout fuse, use the one with the same specifications as the original. 5. When replacing old wire, wind new one round the shaft to weld. When replacing components with safety in performance, use the same type as that specified by AKIRA and install it in the former way. 6. Never place wire near high-temperature or high-voltage components. 7.
GENERAL DESCRIPTION AKPH02 chassis series are applied in A14P01/A21P01 respectively which uses mainly Philips’ advanced UOC-ultimate chip TDA935X/6X/8X and I2C-bus controlled IC. With combination of microcontroller and small signal processor, the TDA935X/6X/8X series feature high-integration, high-performance-to-price ratio and high-reliability and advanced functions with fewer external components, which provide much convenience for manufacturing and technical service.
TECHNICAL SPECIFICATION Test Item AC Operating Range Total Power Consumption EHT Anode Current Heater Voltage B+ Sound power output Model No: 21WHS3-Bn Version 1.0 Conditional TD171 RF&AV signal input with sound loud speaker (volume maximum) & Picture set in Dynamic mode 140Vac ~ 240Vac Philips or Mono-scope pattern signal with howling sound Contrast & Brightness set in Maximum, sound increase maximum 90Watts Standby Mode 14 Watts Brightness & contrast set in Maximum Min: 26.
GENERAL SPECIFICATION Power consumption Receive system Color system Vision intermediate frequency Inter-carrier frequency Chroma if frequency PAL Antenna type Channel receiving Tuning system AV IN/ OUT Component IN AV IN/ OUT specification OSD language Audio output power Safety authentication standard LED indicator Hand set type Hans set power supply Color picture tube Remote control distance External input/output I2C Bus Control Auto Search Off/On Timer Teletext Model No: 21WHS3-Bn Version 1
SAFETY CAUTIONS FOR PRODUCTS Many electric and mechanical components in AKPH01 chassis have special safety performances, which are always neglected. Even if replacing them with some components with the same voltage and power, you can not get effective protection to X-ray. In the circuit diagram, these special electric components are indicated by the special mark ! and on the shadow. When replacing any of them, use the one with the same specifications as the original’s.
ADJUSTMENT MODE Item B+ adjustment, TV signal receiving AKPH01 chassis Measuring Equipment Preparation Before Adj. TV SG (Signal Generator) Digital multi-meter The set is turned on Connect the TV SG to RF input terminal of the set. Adjustment procedure 1, Turn VR501 potentiometer to adjust B+ to specified voltage.
Item TV system adapting & AV in/output inspection AKPH01 chassis Measuring Equipment Preparation before Adj. SG (with NTSC3.58). User remote controller Dual trace oscilloscope Input TV and AV signal Inspection procedure 1, Input the TV signal which system is designated in technical specification 2, Switch TV system to the set by pressing SYS key on user remote controller according to the TV system in SG. The picture and sound must be normal. 3, Press TV/AV key, to select AV input.
To be fine H. line V. line Magnified drawing of Item part White balance adjustment AKPH01 chassis Measuring Equipment Preparation before Adj. SG and white balance meter service remote controller Warm up the set for more than 30 min. Brightness, contrast and color should be set in standard MENU9 CRT cut-off and white balance and sub-brightness adjustment. Receive gray and white 2 steps signal. a) CRT cut off adjustment. 1.
Item RF. AGC adjustment AKPH01 chassis Measuring SG and digital multi meter Equipment service remote controller Preparation Connect a digital multi meter to AGC point on the chassis before Adj. Adjustment procedure 1, Receive the color bar signal that is 87.5% modulation and 60dBu level 2, Press AGC-TOP on service remote controller to select AGC-TOP adjustment, press + or – key to adjust the voltage of AGC-TOP to 6.2±0.05V that is read on the digital multi meter.
Item OSD position adjustment AKPH01 chassis Measuring Equipment Preparation before Adj. service remote controller Brightness, contrast and color should be set in standard Adjustment procedure 1, Press 5 key on service remote controller to set the set into design mode adjustment 2, Press ↑ or ↓ key to select OSD VPOS item, press → or ← key to adjust the OSD to the center position on the screen or press OSD HPOS on service remote controller and press + or – key to adjust the OSD position.
CHASSIS BLOCK DIAGRAM V-in2 A-in2( L) A-in2( R) SIF TRAPS Z351,Z352,Z354 Video-out Audio-out ( L) Audio-out ( R) Video-in1 Audio-in1( L) Audio-in1( R) V352 12 6 15 14 13 AV SWITH N801( CD4052) V351 42 38 7 40 63 5 14 S-video 11 15 4 2 TV AUDIO OUT 3 13 AV SWITH N161( CD4052) 10 9 46 12 1 53 62 44 47 SP162 L 8Ω5W 2 9 10 R 10 4 8 9 11 Y Cr Cb AUDIO AMPLIFIER (N101) AN7522N SP161 8Ω5W PHILIPS UOC TDA9351/61/81 52 51 VIDEO AMPLIFIER V912, V913 V922, V923 V932, V933 CR
FAULT FINDING TREES A Three-None(no raster, no picture, no sound) This failure is mainly caused by big-power circuit such as power supply, horizontal scanning, vertical scanning. The detail checking and repairing steps are as follow.
B Two-None (no picture, no sound) The failure shows that the set does not display the picture but it has noise wave or blue background or OSD on the screen. This means that the circuits of power supply, horizontal scanning, vertical scanning and video amplification are normal and they are not considered in the repairing. The failures are mainly in the small signal processing circuits. Before checking these circuits, a kind of practical test method is introduced. It is called “Signal-input way ”.
<2V Exam the voltage of “ AGC ” on A101 without antenna Check R317, R318, R316,C307,A101,N301 >3.
5. No sound In this kind of failure, first of all we should observe if there is the picture on the CRT. It proves the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound amplification circuit. The repairing method(B1) may be referred without picture. The detail checking and repairing steps are as follow. Note: Before repairing, assure that the volume is on and the state of set is in “TV” .
C Only horizontal line in the middle of the screen: If vertical deflection circuit does not work, this kind of failure will happen. In deflection yoke, there only has horizontal sweeping , the electron beam in the CRT only moves in the horizontal orientation , so form this failure. (While checking horizontal and vertical deflection circuit’ s failure , we have better to use an oscilloscope).
D Only vertical line in the middle of the screen This is a dangerous failure. It probable causes flashover and smoking inside the set. Don’ t let your TV work for a long time as this failure appears. Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit. We mainly check the open-circuit fault in horizontal deflection circuit.
E UOC does not work In television, remote-control system is similar with the computer system. In theory , it can work if it holds two conditions as follow: 1. The power supply: In general, it is 5V, the error is not above 10% and the disturbance pulse is as small as possible. 2. The clock pulse: In TDA93XX circuit, the clock pulse is generated by pin58 / pin59 of N301 and 12M crystal oscillator. Television’ s remote-control system also needs reset circuit that can preset the values in internal register.
IC BLOCK DIAGRAM Fig 1: UOC-TDA9381 Illustration Model No: 21WHS3-Bn Version 1.
MAIN CHIP INSTRUCTION Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9, Pin 12, Pin 18, Pin 30, Pin 35, Pin 41, Pin 55 Pin 10 Pin 11 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 Pin 21, Pin 22 Pin 23, Pin 24 Pin 25 Pin 26 Pin 27 Pin 28 Pin 29 Pin 30 Pin 31 Pin 32 Pin 33 Pin 34 Pin 35 Standby control, “1” is on, “0” is off. SCL SDA Tuning PWM output Auto AV control SW, connected with the SCART 8th pin. Input. The rising edge or the falling edge operates. Key board input.
Pin 36 Pin 37 Pin 38 Pin 39 Pin 40 Pin 42 Pin 43 Pin 44 Pin 45 Pin 46, Pin 47, Pin 48 Pin 49 Pin 50 Pin 51, Pin 52, Pin 53 Pin 54 Pin 55 Pin 56 Pin 57, Pin 58, Pin 59 Pin 60 Pin 61 Pin 62 Pin 63 Pin 64 EHT tracking /over voltage protection. If something is wrong, the anode high voltage rise the heater voltage will rise too. When the rising voltage arrive some limit, the V406 works, the voltage of pin 36 will exceed 3.9V. The OM8370 will stop working. PLL loop filter. CVBS output.
Fig 2: HEF4052BP Illustration Model No: 21WHS3-Bn Version 1.
FUNCTION TABLE OF N4052 Input Channel On Ē L L L L H A1 L L H H X A0 L H L H X Y0A – ZA; Y0B – ZB Y1A – ZA; Y1B – ZB Y2A – ZA; Y2B – ZB Y3A – ZA; Y3B – ZB NONE Notes: H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial Model No: 21WHS3-Bn Version 1.
IC N402 LA78040 (or STV9302) Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
1 2 3 4 5 6 7 Inverting input Vcc Pump up out GND VER output Output stage Vcc Non inv. Put Model No: 21WHS3-Bn Version 1.
Fig 4 AN7522N Illustration Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Model No: 21WHS3-Bn Version 1.
Fig 5: KA5Q0765RT Illustration Model No: 21WHS3-Bn Version 1.
FACTORY MENU Main power +B setting Receive standard color pattern RF signal. Set picture to “Standard Mode”. Adjust VR501, to get +B (VD542 -) voltage =110V. I2C bus control adjustment method How to enter and exit factory mode (with customer’s remote controller) 6. Press [menu] key → display picture menu 7. Press digital key “8” “5” “0” “0” → display “M” 8. Push [standby] key two time to exit factory mode and return to normal.
MI M4 Items SUBCON SUBCOL SUBSHP SUBTINT YDLY PAL YDLY NTSC YDLY SEC YDLY AV UOC VOL CATHODE SC BRI Variable 0~63 0~63 0~63 0~15 0~15 0~15 0~15 0~15 ON/OFF 0~15 0~63 Preset 63 63 63 15 12 12 12 12 Off 15 10 M5 OSD VPOS OSD HPOS WIDE ZOOM NENU TITLE E2PROM ADRESS E2PROM VALUE E2PROM WRITE SHIPMODE SEARCH SPEED AGC-TOP AGC-SPEED 0~63 0~59 0~63 0~63 0~6 0~33 0~95 53 15 15 59 3 0~3 0~63 0~3 0 25 2 0~63 0~63 0~63 0~63 0~63 50HZ 30 42 37 19 39 M6 M7 M8 M9 FREQUENCY VSLOPE VSHIFT VAMP VSCOR HSHI
Directions for use 1. M1/AV CFG: Mode Function select 0 TV→AV 1 TV→AV1→AV2 2 TV→AV1→AV2→S-VIDEO 3 TV→AV1→AV2→S-VIDEO→YUV 4 TV→AV→S-VIDEO 5 TV→AV→S-VIDEO→YUV 6 7 TV→AV→YUV TV-EURO 8 TV-AV-EURO 2. method of LOGO input: 3) when E2PROM ADRESS = 0, to adjust E2PROM VALUE may be changed horizontal position of LOGO. It’s range is from 10 to 20. 4) when E2PROM ADRESS =1, to adjust E2PROM VALUE may be changed vertical position of LOGO. It’s range is from 1 to 30.
EXPLODED VIEW AND PART NAME Model No: 21WHS3-Bn Version 1.
BOM LIST Ref. No R411 R312 R871 R914 R924 R934 R398 R806 R368 R708 R911 R921 R931 R354 R355 R304 R801 R313 R301 R302 R363 R365 R366 R381 R382 R383 R401 R402 R452 R723 R724 R743 R815 R824 R861 R862 R815A R848 R852 R353 R311 R917 R927 R937 R913 R923 R933 R805 R916 R926 R936 R322 R308 Part No.
Ref. No R1517 R316 R482 R128 R129 R369 R460 R464 R481 R734 R802 R803 R816 R818 R825 R827 R305 R560 R397 R732 R430 R405 R1523 R351 R371 R451 R463 R701A R321 R702 R721 R722 R728 R735 R736 R737 R741 R742 R455 R462 R131 R133 R154 R158 R306 R733 R370 R540 R701 R1511 R153A R157A R126 R127 Part No.
Ref. No R163 R380 R395 R396 R434 R461 R548 R551 R704 R705 R706 R707 R709 R816A R818A R825A R827A R851A R852A R912 R922 R932 R331 R162 R384 R804 R1515 R1556 R484 R487 R171 R175 R317 R385 R172 R732A R745 R173 R483 R802A R803A R807 R318 R174 R465 R404 R468 R513 R561 R486 R161 R1526 R485 R1522 Part No.
Ref. No R539 R539A R1554 R942 R407 R453 R1555 R507 R1520 R406 R300A Ref. No R466 R941 R530 R454 R546 R467 R703 R915 R925 R935 R556 R519! R918 R928 Part No. D10C513J-T D10C513J-T D10C154J-T D10C334J-T D10D271J-T D10D102J-T D10D473J-T D10D124J-T D10D124J-T S10E1R2J-C S10E220J-C Part No.
Ref. No C732 C381 C323 C308 C311 C340 C401 C402 C481 C721 C861 C335 C324 C336 C162 C302 C309 C312 C313 C332 C362 C472 C475 C535 C703A C723 C744 C752 C756 C482 C405 C452 C451 Part No.
Ref. No C363 C364 C367 C751 C807 C841 C871 C745 C116 C171 C333 C352 C561 C723A C811 C823 C361 C743 C525 C532 C801 C406 C471 C471A C474 C474A C161 C522 C524 C453 C530 C121 C123 C372 C374 C153 C157 C163 C337 C804 C806 C813 C815 C825 C837 C339 C755 C303 C304 C325 C464 C703 C462 Part No.
Ref. No C466 C528B C477 C941 C458 C507 C326 C338 C365 C411 C331 C334 C404 C461 C321 C154 C158 C1515 C1517 C403 C408 C1513 C427 C1514 C460 C705 C706 C707 C467 C415 ! C501 ! L414 L351 L302 L331 L361 L751 Ref. No L752 L753 L401 L911 L912 L913 L501 ! N504 ! VD1001 VD171 VD461 VD462 VD482 VD561 VD734 Part No.
Ref. No VD911 VD921 VD931 VD1514 VD1516 VD1518 VD912 VD922 VD932 VD401 VD470 VD471 VD525 VD1517 VD503 VD504 VD505 VD506 VD436 VD472 VD524 VD521 VD543 VD300A VD481 VD564 VD1561 VD381 VD382 VD383 VD1519 Ref. No VD460 VD483 VD822 VD861A VD941 N703 N161 N505 N121 N801 N301 N401 N702 N503 V1511 V171 V542 V308 V911 V921 V931 Part No.
Ref. No V913 V923 V933 V912 V922 V932 V450 V1512 V1513 V121 V122 V173 V351 V352 V354 V395 V504 V801 V1553 V451 V701 Z352 Z354 Z351 Z301 F501 ! A1001 A101 SW1001 SW1002 SW1003 SW1004 SW1005 SW1006 Z761 Part No.
CIRCUIT DIAGRAM Model No: 21WHS3-Bn Version 1.