Tx-29p20t - Shema.ru

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ORDER NO. MTV0001130C3 Colour Television TX-29P20T MX-8A Chassis Specification Power Source : Power Consumption : Aerial Terminal: Tuning System: Receiving System : AC AUTO 110 / 240V, 50/60Hz 75Ω Coaxial type Frequency Synthesizer Auto Search Tuning Pos : 100 Positions 17 System Receiving Channels : VHF UHF CATV 2-12 (PAL/SECAM B,K1) 0-12 (PAL B AUST)1-9 (PAL B N.Z) 112 (PAL/SECAM D) 1-12 (NTSC M JAPAN) 2-13 (NTSC M U.S.A) 21-69 (PAL G,H,I/SECAM G,K,K1)28-69 (PAL B AUST) 1357 (PAL D,K)13-62 (NTSC M JAPAN)14-69 (NTSC M U.S.A) S1-S20 (OSCAR) 1-125 (U.S.A CATV) C13-C49 (JAPAN) S21S41 (HYPER)Z1-Z37 (CHINA) Intermediate Frequency : Video Sound Colour 33.57 MHz (PAL)33.6 MHz (SECAM) 34.42 MHz (NTSC)33.75 MHz (SECAM) 170W (Max) 0.7W (Stand-by condition) Receiving Stereo Sound System : AV STEREO / TEXT Video / Audio Terminals : AV 1,2,3 IN S-Video Y:1.0V p-p 75Ω DVD IN S-Video C:0.3Vp-p 75Ω Y/PB/PR (Phone type) Y:1.0 Vp-p 75Ω PB, PR:0.7 Vp-p 75Ω Video 1.0 Vp-p 75Ω Audio Approx. 400mV 47KΩ Monitor Out : Video 1.0 Vp-p 75ΩAudio Approx, 400mV 1kΩ High Voltage : 31.0 kV (+0.7, -1.5kV )at zero beam current Picture Tube : M68LQK185X Type 29 (68 cm)Measured diagonally, 104° deflection Audio Output : 16W Dimensions : Mass : Height : 582 mmWidth : 688 mmDepth : 492 mm 47.6 kg (Net) Accessories Supplied Remote Control Transmitter x 1, R6 Battery x 2 38.0 MHz 31.5 MHz (D,K) / 32.5MHz (B,G) 32.0 MHz (I) / 32.5MHz (M) Specifications are subject to change without notice. Mass and dimensions shown are approximate. © 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. TX-29P20T CONTENTS Page Page 3 8 X-BOARDTNP4G108AP 16 1.1. General Guide 3 9 T-BOARDTNP4G115AC 16 1.2. Leakage Current Cold Check 3 10 L-BOARDTNP4G107AP 17 1.3. Leakage Current Hot Check 3 11 Schematic Diagram for models TC-15PM10R (MX-7 Chassis) 1.4. X-Radiation 4 1 Safety Precautions 18 2 Location of Controls and Circuit Boards 4 12 SCHEMATIC 1 19 3 Service Hints 6 13 SCHEMATIC 2 20 4 Special Service Procedure 6 14 SCHEMATIC 3 21 4.1. Market Mode Function 5 Adjustments 5.1. White Balance (MARKET MODE CHK 3) 6 G-BOARDTNP4G120AK 6.1. A-BOARDTNP4G104BC 7 H-BOARDTNP4G131AB 7 14.1. SCHEMATIC 4 22 9 14.2. SCHEMATIC 5 23 11 14.3. SCHEMATIC 6 (LEFT HALF) 24 13 14.4. SCHEMATIC 6 (RIGHT HALF) 25 14.5. EXPLODED VIEW 26 14 15 15 Replacement Parts List 2 27 TX-29P20T 1 Safety Precautions 1.1. General Guide 1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis. Fig. 1 2. When servicing, observe the original lead dress, especially the lead dress in the high voltage circuits. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 3. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shields, and isolation R-C combinations, are properly installed. 4. When the receiver is not to be used for a long period of time, unplug the power cord from the AC cord outlet. 5. Potential, as high as 31.7 kV. is present when this receiver is in operation. Operation of the receiver without the rear cover involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the picture tube to the receiver chassis before handling the tube. After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazards. 1.2. Leakage Current Cold Check 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. Fig. 2. Fig. 2 2. Turn on the receiver’s power switch. 3. Measure the resistance value, with an ohmmeter, between the jumper AC plug and each exposed metallic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts, etc. When the exposed metallic part has a return path to the Ω and 20 MΩ Ω. When the exposed metal does not have a return path to the chassis, chassis, the reading should be between 4 MΩ the reading must be zero. 1.3. Leakage Current Hot Check 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 2kΩ, 10W resistor, in series with an exposed metallic part on the receiver and an earth such as a water pipe. 3. Use an AC voltmeter, with high impedance type, to measure the potential across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. Fig. 3. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 1.0V rms. In the case of a measurement being outside of these limits specified, there is a possibility of a shock hazard, and the receiver should be repaired and rechecked before it is returned to the customer. Fig. 4. 3 TX-29P20T 1.4. X-Radiation Warning : 1. The potential sources of X-Radiation in TV sets are the High Voltage section and the picture tube. 2. When using a picture tube test rig for service, ensure that the rig is capable of handling 31.7kV without causing X-Radiation. Note: It is important to use an accurate periodically calibrated high voltage meter. 1. Set brightness to minimum. 2. Measure the High Voltage. The meter reading should indicate 31.0 +0.7, -1.5 kV. If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure. 3. To prevent possibility of X-Radiation, it is essential to use the specified picture tube. 2 Location of Controls and Circuit Boards Location and Function Name of Circuit Board A - Main L - Crt Board T - Text X - Pin Cushion H - Rear Av G - Power Board 4 TX-29P20T 5 TX-29P20T 3 Service Hints How to move chassis into service position 1. Remove 9 screws 2. Draw out Main Chassis 3. Stand the Main Chassis 4 Special Service Procedure 1. Self Check Function SELF CHECK is used to automatically check the Bus Lines and Option code of the TV set. Contents of the SELF CHECK are as follows: 6 TX-29P20T a. Confirmation result for IC function. b. Option code. Procedure a. Simultaneously push the OFF TIMER button on the remote control and the Volume Down button - on the TV set panel. b. The TV enters the selfcheck mode and the result is displayed on the screen (as shown below). Please note that the programme number will be changed to position “1”. c. Press any key to clear the selfcheck mode and return to the normal state. 2. How to replace memory IC (1102) Much data for controlling circuits in the TV set is memorized in the Memory IC (IC1102). a. Change the defective memory IC to the replacement IC. b. Turn the TV set ON and perform the SELF CHECK Function. c. When exiting SELF CHECK Mode the customer settings will return to factory setup. d. Confirm the correct Deflection and White Balance adjustment. 4.1. Outline : Market Mode Function MPU controls the functions switching for each IC through IIC bus in this chassis. The following settings and adjustments can be adjusted by remote control in Market Mode. 1. Selection of Market Mode Adjust VOLUME to “zero” and set OFF TIMER Button (turn on the timer). Then simultaneously press the RECALL Button on the remote control and the VOLUME DOWN Button on the TV set. 2. Selection of CHK Mode Cursor moves to each CHK mode by pressing “1” or “2” of 10 key buttons on the remote control. 1. Option Code Setting Mode (CHK 1) If the memory IC (IC1102) is replaced, option code should be re-memorized. Option code can be changed by pressing Volume “+” or “-” button. To memorize, press “0” of 10 key buttons. Fig. A. Display Colour sys Ch. Plan Noise Mute Speed Vcr / Game Av Stereo Geo Saso Text Pana Display Adj. Range 0~6 0~9 Off / On Off / On Off / On Off / On Off / On 0~2 Off / On 0~2 Off / On 2. VCJ Adjustment Mode To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume “+” or “-” button. Display RF AGC BELL FILTER BY RY SHARPNESS SUB Y CONTRAST CONTRAST SUB-BRIGHT BRIGHT SUB NTSC TINT NTSC-TINT SUB COLOUR COLOUR Adj. Range 00H ~ FFH 00H ~ 03H 00H ~ 0FH 00H ~ 0FH 0 ~ 63 00H ~ 1FH 0 ~ 63 00H ~ FFH 0 ~ 63 00H ~ 3FH 00H ~ 3FH 00H ~ 3FH 0 ~ 63 3. Pincushion Adjustment Mode To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume “+” or “-” button. 7 TX-29P20T Display PARABOLA V-HEIGHT (60Hz) V-HEIGHT (50Hz) V-CENTER 50 H.CENTER EW CORNER 2 EW CORNER 1 TRAPEZOID V-LINEAR 60Hz VS CORRECT 50Hz VS CORRECT H-WIDTH 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H 00H ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Adj. Range 3FH 7FH 7FH 07H 1FH 0FH 0FH 3FH 3FH 3FH 3FH 3FH Note: Picture will be changed to the one horizontal line by pressing “5” of 10 key buttons on the remote control (no. 1-5) 4. White Balance Adjustment Mode To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume “+” or “-” button. Display B.DR R.DR SUB.BR BRIGHT B-CUT G-CUT R-CUT Adj. Range 00H ~ FFH 00H ~ FFH 00H ~ FFH 0 ~ 63 00H ~ FFH 00H ~ FFH 00H ~ FFH 8 TX-29P20T 5 Adjustments Item / Preparation B Voltage 1. Operate the TV set. Adjustment Procedure Confirm the indicated test points for the specified voltage: TPA 140 : 140 ± 0.2V TPA 12 : 12 ± 1V TPA 9 : 9 ± 1V TPA 5 & TPA 32 : 5 ± 1V TPA 220 : 220 ± 15V 2. Set control: (MARKET MODE CHK 2) Brightness.............min imum Sub Bright.............minimum Volume.................min imum RF AGC 1. Receive a colour bar pattern. 1. Set RF AGC Control such as to procedure a snowy picture. 2. Set RF AGC Control at the point just before the voltage at AGC:TPA20 begins to drop. 2. Set the input level to 63 ± 1dB. (75Ω opened). 3. Connect an oscilloscope to AGC:TPA20 with DC mode. 3. Increase the input level by 2dB and confirm that the voltage changes. High Voltage 1. Operate the TV set. 1. Connect a DC voltage meter to TPD 16 and confirm the +B voltage is 141.0 ± 2.0V. 2. Receive the crosshatch pattern. 2. Connect a high voltage meter (Electrostatic Type) to an anode of the picture tube. 3. Set to 0 Beam. (Screen Control : min. CONTRAST : min) 3. Confirm that the high voltage is within the range of 31.0 ± 0.7 kV. Sub Contrast 1. Receive a colour bar pattern. 1. Adjust Bright Control: a=2.3 ± 0.2 Vp-p 2. Connect an oscilloscope to TPA41. 3. Connect a short jumper between TPA57 & TPA50 FBT pin3 & TPA32. 2. Adjust Sub Contrast Control: b=2.8 ± 0.1 Vp-p 4. Set controls: Picture menu....................Dyn amic Normal PAL Colour Output 1. Receive a PAL colour bar pattern. 1. Adjust Bright Control: a=2.3 ± 0.2 V 2. Connect an oscilloscope probe to TPA41. 3. Connect a short jumper between TPA57 & TPA50 FBT pin3 & TPA32. 2. Adjust Sub Colour control. 3. Connect the oscilloscope probe to TPA41. 4. Connect the waveform: b=2.2 ± 0.1 Vp-p 4. Set controls: Picture menu....................DYN AMIC NORMAL NTSC Colour Output 1. Apply 3.58MHz NTSC Rainbow pattern. 1. Adjust Bright Control: a=2.3 ± 0.2 Vp-p 2. Connect an oscilloscope probe to TPA40. 3. Connect a short jumper between D11-1 and D11-2 / TPA53 and TPA54. 4. Set controls: Picture menu....................DYN AMIC NORMAL 9 2. Confirm that the waveform: b=1.3 ± 0.5Vp-p TX-29P20T Before Colour Purity, Convergence and White Balance adjustments are attempted, V. Center, V. Height, H. Width, H. Centre and Focus adjustments must be completed. Colour Purity Convergence 1. Set the Brightness and Contrast controls to their maximum positions. 1. Apply a crosshatch pattern signal and set Contrast control to the maximum position. 2. Operate the TV set for over 15 minutes. 2. Adjust Brightness control to obtain a clear pattern. 3. Fully degauss the picture tube by using an external degaussing coil by rotating R-B static convergence magnet. 3. Adjust the Red and Blue line at the centre of the screen. 4. Apply a crosshatch pattern signal and adjust the static convergence magnets roughly. 5. Apply a green pattern signal. 6. Loosen a clamp screw for the deflection yoke and move the deflection yoke as close to the purity magnet as possible. 7. Adjust the purity magnetic so that a vertical green field is obtained at the centre of the screen. Fig. 22 Fig. 20 4. Adjust Red and Blue with Green line at centre of the screen by rotating (RB) -G static convergence magnet. 8. Slowly press the deflection yoke and set it where a uniform green field is obtained. 5. Lock convergence magnets with silicone sealer. 6. Remove the DY wedges and slightly tilt the deflection yoke vertically and horizontally to obtain the good overall convergence. 9. Adjust roughly the Low Light controls and make sure that a uniform white field is obtained. 10. Tighten the clamp screw. Fig. 23 7. Fix the deflection yoke by reinserting the DY wedges. Refer to Fig. 24. 8. If purity error is found, repeat “Colour Purity” adjustment. 10 TX-29P20T 5.1. 5.1.1. White Balance (MARKET MODE CHK 3) Note : Write down the original value for each address before adjusting anything. Preparation 1. Receive a colour bar signal with colour “OFF”, and operate the TV set for more than 15 minutes. 2. Set the picture menu to “DYNAMIC NORMAL” and the AI to off. 3. Connect an oscilloscope to TPL7 with DC mode. 4. Set the TV set to Market Mode : white balance adjustment (CHK 3). 5. Set the data level of SUB BRIGHT, R,G,B-CUT OFF and R,G,B-DRIV to the table values. Display R-CUT OFF G-CUT OFF B-CUT OFF R-DRIVE B-DRIVE SUB BRIGHT 5.1.2. Data Level 63 128 63 128 128 63 8. Wedge A shown in Fig. 2 should be fixed within a range of 45 to the left of the vertical line as shown. 9. After inserting wedge A, insert wedges B, C and D. The wedges should be set 90 degrees apart from each other. 10. Be certain that the four wedges are firmly fixed and the Deflection Yoke is tightly clamped in place otherwise the Deflection Yoke may shift its position and cause a loss of convergence and purity. Adjustment 1. Select G-CUT OFF adjustment mode and collapse vertical scan. 5.1.3. 2. Adjust G-CUT OFF control to become the DC=0V to video level at 180 V as shown in Fig. 1. Adjustment of Pincushion 1. Receive the crosshatch pattern. 2. Adjust the vertical line to straight line by PARABOLA. 3. Adjust the vertical line to straight line of bothside vertical line in Fig. 1 by TRAPEZOID. 4. Adjust the corner-pincushion in Fig. 2 by EW-CORNER 1 and EW-CORNER 2. 3. Slowly turn the screen control clockwise until a green colour horizontal line appears on the picture tube. This is the setting point for the screen control. Note that do not adjust the G-CUT OFF setting in the following procedure. 4. Adjust the remained R and B-CUT OFF contyrols so as to get a white horizontal line on the screen. 5. Return to full SCAN by pushing the position 5 key on the remote control. 6. Adjust the R-Drive and B-Drive controls as to obtain uniform white on the white bar of the grey scale pattern. 7. Confirm correct B/W rendition and greyscale tracking or repeat CUT OFF and drive control set up. 11 TX-29P20T 6 G-BOARD TNP4G120AK 13 TX-29P20T 6.1. A-BOARD TNP4G104BC 14 TX-29P20T 7 H-BOARD TNP4G131AB 15 TX-29P20T 8 X-BOARD TNP4G108AP 9 T-BOARD TNP4G115AC 16 TX-29P20T 10 L-BOARD TNP4G107AP 17 TX-29P20T 11 Schematic Diagram for models TC-15PM10R (MX-7 Chassis) IMPORTANT SAFETY NOTICE Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturer’s specified parts. Notes: 1. Resistor All resistors are carbon 1.4W resistors unless marked as follows: Unit of resistance is OHM (Ω) (K=1 000 M=1 000 000) Nonflammable Solid Wire Wound Metal Oxide Metal Film Fuse 2. Capacitor All capacitors are ceramic 50V capacitors unless marked as follows: Unit of capacitance is µF, unless otherwise noted. Temperature Compensation Polyester Metalized Polyester Polypropylene Electrolytic Bipolar Dipped Tantalum Z-Type 3. Coil Unit of inductance is µH, unless otherwise noted. Unit of resistance is OHM (Ω) (K=1 000 M=1 000 000) 4. Test Point : Test Point position 5. Earth Symbol : Chassis Earth (Cold) : Line Earth (Hot) 6. Voltage Measurement Voltage is measured using a DC voltmeter. Conditions of the measurement are the following: Power Source..........................AC 220V, 50Hz Receiving Signal.....................Colour Bar signal (RF) All customer’s controls............Maximum positions 7. Number in red circle indicates waveform number. (See waveform pattern table) 8. When arrow mark ( 9. ) is found, connection is easily found from the direction of arrow. : Indicates the major signal flow. 10. This schematic diagram is the latest at the time of printing and subject to change without notice. Remarks: 1. The Power Circuit contains a circuit area which uses a separate power supply to isolate the earth connection. The circuit is defined by HOT and COLD indications in the schematic diagram. Take the following precautions: All circuits except the Power Circuit are cold. Precautions: a b c d Do not touch the hot part or the hot and cold parts at the same time or you may be shocked Do not short-circuit the hot and cold circuits or a fuse may blow and parts may break Do not connect an instrument such as an oscilloscope to the hot and cold circuits simultaneously or a fuse may blow. Connect the earth of instruments to the earth connection of the circuit being measured. Make sure to disconnect the power plug before removing the chassis. 18 TX-29P20T 15 Replacement Parts List Important Safety Notice Components identified by ! mark have special characteristics important for safety. When replacing any of these components, use manufacturer’s specified parts. Note: Printed circuit board assembly with “NLA” is no longer available after production discontinuation of the complete set. Abbreviation of part name and description 2. Capacitor 1. Resistor Example: Example: ECKF1H103ZF C 0.01UF, Z, 50V Type Allowance ERD25TJ104 C 100KΩ, J, 1/4W Type Allowance Type Type Allowance Allowance C: Carbon C: ±0.25pF C: Carbon F: ±1% E: Electrolytic D: ±0.5pF F: Fuse G: ±2% M: Metal Oxide Metal Film J: ±5% K: ±10% P: Polyester Polypropylene F: ±1pF G: ±3% T: Tantalum J: ±5% S: Solid M: ±20% K: ±10% W: Wire Wound L: ±15% M: ±20% P: +100% -0% Z: +80% -20% 27 TX-29P20T 28 TX-29P20T 29 TX-29P20T 30 TX-29P20T 31 TX-29P20T 32 TX-29P20T 33 TX-29P20T 34 TX-29P20T 35 TX-29P20T 36 TX-29P20T 37 Printed in Malaysia 00050350