Related Manuals for Changhong Electric PF29GA18A
Summary of Contents for Changhong Electric PF29GA18A
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Page 1: Service Manual
COLOR TELEVISION SERVICE MANUAL PF29GA18A MODEL NO. CHASSIS NO. ETA-1D Please read this manual carefully before service. -
Page 2: Table Of Contents
TABLE OF CONTENTS SAFETY INSTRUCTIONS AND MAINTENANCE ........1 X-RAY RADIATION PRECAUTION................…..1 SAFETY PRECAUTION ....................…..1 PRODUCT SAFETY NOTICE..................…..2 SAFETY SYMBOL DESCRIPTION ................…..3 MAINTENANCE......................…..3 ADJUSTMENTS .......................…..4 SET-UP ADJUSTMENTS .....................…..4 CIRCUIT ADJUSTMENTS....................…..7 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION .....…..13 STRUCTURE BLOCK DIAGRAM ..................…..13 CHASSIS DESCRIPTION..................……..14 SERVICE DATA ....................…..…..15 TECHNICAL DATA OF KEY ICS ................…..…..15... -
Page 3: Safety Instructions And Maintenance
SERVICE MANUAL SAFETY INSTRUCTIONS AND MAINTENANCE “ WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION ” “ ” “ ” PRECAUTION SAFETY PRECAUTION PRODUCT SAFETY NOTICE INSTRUCTION BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. -
Page 4: Product Safety Notice
SERVICE MANUAL 4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W). 5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT. 6. -
Page 5: Safety Symbol Description
SERVICE MANUAL SAFETY SYMBOL DESCRIPTION The lightning symbol in the triangle tells you that the voltage inside this product may be strong enough to cause an electric shock. Extreme caution should be exercised when working on the TV with the back removed. This is an international hazard symbol, telling you that the components identified by the symbol have special safety-related characteristics. -
Page 6: Adjustments
SERVICE MANUAL ADJUSTMENTS SET-UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in the following order: 1. Color purity 2. Convergence 3. White balance Notes: ①... - Page 7 SERVICE MANUAL Fig. 1 2. Convergence Adjustment Preparation: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. 2.1 Center convergence adjustment 2.1.1 Receive dot pattern. 2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture. 2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed each other on the center of the screen.
- Page 8 SERVICE MANUAL deflection yoke assembly on the picture tube. 2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection yoke assembly on the picture tube. 2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal convergence.
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Page 9: Circuit Adjustments
SERVICE MANUAL CIRCUIT ADJUSTMENTS Preparation: Circuit adjustments should be made only after completion of set-up adjustments. Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with C bus control, first change the bus data. 1. - Page 10 3. High Voltage Inspection Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high voltage with the high-voltage testing equipment and heater voltage with the high-frequency effective voltmeter. The rated values are shown as below. Table 2 Test Point Voltage (V)
- Page 11 SERVICE MANUAL degaussing coil to be over 20MΩ. 6. SERVICE mode 6.1 To enter the DESIGN/SERVICE mode Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the MENU button on the TV to enter the SERVICE mode. In this case, blue “D” is displayed on the upper center of the screen.
- Page 12 SERVICE MANUAL SHPN SHARP MIN(difference from center) SHPX SHARP MAX(difference from center) ABCL ABL date in detail DCBS A part of Video date in detail The date when TV mode & SOUND SYS CLTB = B/G The date when TV mode & SOUND SYS CLTD = D/K PAGE5...
- Page 13 SERVICE MANUAL OSDF OSD PLL DATE TB_COL Menu top OSD area plane color set BB_COL Menu itmes OSD area plane color set CL_COL1 Calendar OSD color CL_COL2 Calendar OSD color PAGE11 PYNX Normal H.SYNC max PYNN Normal H.SYNC min PYXS Search H.SYNC max PYNS Search H.SYNC min...
- Page 14 SERVICE MANUAL LOGO1COLOR LOGO2COLOR LOGO1LINE LOGO2LINE PAGE18 LOGO1SIZE LOGO2SIZE WIDS DPCS PAGE19 KEYS ECCT ECCB HEHT DPC69 HIT69 TREC PAGE20 TREX VEHT SECD SEC29 BASC BASX PAGE21 MODE3 BALC FVOL NVOL Notes: ① The data sheet may differ dependent on different models. ②...
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Page 15: Structure And Chassis Function Description
SERVICE MANUAL STRUCTURE AND CHISSIS FUNCTION DESCRIPTION 1.STRUCTUE BLOCK DIAGRAM Video Amplifier H.OUT TMP8897 TUNER V.OUT Audio Power Supply Amplifier Circuit Structure Block Diagram for ETA-1Ｄ Chassis Series... -
Page 16: Chassis Description
SERVICE MANUAL 2. CHASSIS DESCRIPTION General Description ETA-1D chassis is applied in PF29GA18A series. By use of Toshiba V/C/D-MCU 2IN1 IC for TV small signal processing and bus control, the chassis enables TV tuning, adjustment, control and picture correction, featuring high-integration, high-performance-to-price ratio and high-reliability and compact circuit with fewer external components. -
Page 17: Service Data
SERVICE MANUAL SERVICE DATA TECHNICAL DATA OF KEY ICS 1.MCU and Signal Processor for a PAL/NTSC TV TMPA8897CMANG /CPANG/CRANG /CSANG 1.General Description The TMPA8897CPANG is an integrated circuit for a PAL/NTSC TV. A MCU and a TV signal processor are integrated in a 64-pin shrink DIP package. - Page 18 SERVICE MANUAL 2.Features CCD Decoder ●High speed 8-bit CPU (TLCS-870/X series) ●Digital data slicer for NTSC ●Instruction execution time: 0.5 s (at 8 MHz) ●(TMPA8873CPANG) ●Clock generation for OSD display 48-Kbytes ROM, 2-Kbytes RAM ●Clock generation for OSD display ●ROM correction ●Font ROM characters: 384 characters ●12 I/O ports...
- Page 19 SERVICE MANUAL 3.Block Diagram...
- Page 20 Monolithic Linear IC LA42102 10W 2-Channel BTL Power Amplifier Tentative LA42000 series is power IC which made Pin compatible possible altogether in 3 to 20W. It enables communization of a set board. （mono, stereo, mono with volume function , stereo with volume function.）. They realized PCB layout communalization of an audio power block of TV.
- Page 21 Operating Characteristics at Ta = 25℃,V = 14V,R = 8Ω,f = 1kHz,Rg = 600Ω Ratings Parameter Symbol Conditions Unit Standby current Amplifier off Quiescent current Rg=0 , R =open Output power THD=10% Total harmonic distortion Po=1W 0.06 Voltage gain Vo=0dBm Output noise voltage Rg=0,BPF=20Hz to 20kHz mVrms...
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Page 22: Block Diagram
Block Diagram Standby Input amplifier + OUT1 Output amplifier 30kΩ - OUT1 MUTE Vcc / ground shorting protection circuit Load shorting protection circuit Thermal protection circuit + OUT2 Output amplifier 30kΩ - OUT2 Input amplifier Ripple Filter Equivalent Circuit LA42102 Ripple STBY MUTE... - Page 25 SERVICE MANUAL 5. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041 Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little bit difference between the two amplifiers, that is, LA78040 has supply voltage of 24V and output current of 1.8AP-P while LA78041 has supply voltage of 30V and output current of 2.2AP-P. LA78040/LA78041 (N602) Vertical Deflection Output Circuit 1) Features...
- Page 26 SERVICE MANUAL 6. EEPROM AT24C04/08/16 1) Features Low-voltage and Standard-voltage Operation -2.7 (Vcc=2.7V to 5.5V) -1.8 (Vcc=1.8V to 5.5V) Internally Organized 128x8(1K), 256x8 (2K), 512x8 (4K), 1024x8 (8K) or 2048x8 (16K) 2-wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bi-directional Data Transfer Protocol 100kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility Write Protect Pin for Hardware Data Protection...
- Page 27 SERVICE MANUAL 3) Pin Configuration Table 12 8-lead MAP 8-lead TSSOP Pin Name Function A0-A2 Address Inputs Serial Data Serial Clock Input Write Protect No Connect Bottom View Fig. 14 8-pin PDIP 8-lead SOIC Fig. 15 4) Pin Description SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device.
- Page 28 SERVICE MANUAL protection. The Write Protect pin allows normal read/write operations when connected to ground (GND). When the Write Protect pin is connected to Vcc, the write protection feature is enabled and operates as shown in table 14. Table 13 WP Pin Part of the Array Protected Status...
- Page 29 www.fairchildsemi.com FSCQ1265RT Green Mode Fairchild Power Switch (FPS ) for Quasi-Resonant Switching Converter Features OUTPUT POWER TABLE • Optimized for Quasi-Resonant Converter (QRC) 230VAC ±15% 85-265VAC • Advanced Burst-Mode operation for under 1 W standby PRODUCT power consumption Open Frame Open Frame •...
- Page 30 FSCQ1265RT Internal Block Diagram Sync Drain Quasi-resonant (QR) switching Threshold controller 9V/15V Soft start 4.6V/2.6V : Normal QR Vcc good 3.0V/1.8V : Extended QR Burst mode Auxiliary Controller Vref Main bias Burst Normal operation Burst Switching Normal Internal operation Vref Vref Vref bias...
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Page 31: Pin Configuration
FSCQ1265RT Pin Definitions Pin Number Pin Name Pin Function Description Drain High voltage power SenseFET drain connection. This pin is the control ground and the SenseFET source. This pin is the positive supply input. This pin provides internal operating current for both start-up and steady-state operation. This pin is internally connected to the inverting input of the PWM comparator. - Page 32 FSCQ1265RT Absolute Maximum Ratings (Ta=25°C, unless otherwise specified) Parameter Symbol Value Unit Drain-Source (GND) Voltage Drain-Gate Voltage (R =1MΩ) Gate-Source (GND) Voltage ±30 Drain Current Pulsed Single Pulsed Avalanche Energy Continuous Drain Current (Tc = 25°C) Continuous Drain Current (T =100°C) Supply Voltage -0.3 to 13V...