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Model no.:CT-21CBS5CPH.doc
version 1.0

38

4. 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

Low power dissipation due to
built-in pump-up circuit Vertical
output circuit Thermal protection
circuit built in Excellent
crossover characteristics DC
coupling possible

2) Block Diagram

Fig. 13 Block Diagram

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Содержание CT-21CBS5CPH

Страница 1: ...C C Co o ol l lo o or r r T T TV V V S S Se e er r rv v vi i ic c ce e e M M Ma a an n nu u ua a al l l...

Страница 2: ...Model no CT 21CBS5CPH doc version 1 0 2 Model C C CT T T 2 2 21 1 1C C CB B BS S S5 5 5C C CP P PH H H C C Ch h ha a as s ss s si i is s s E E ET T TA A A 1 1 1...

Страница 3: ...ESCRIPTION 7 MAINTENANCE 8 MECHANICA DISASSEMBLING 9 ADJUSTMENTS 11 SET UP ADJUSTMENTS 11 CIRCUIT ADJUSTMENTS 14 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 20 STRUCTION BLOCK DIAGRAM 20 SERVICE DATA 2...

Страница 4: ...using an accurate EHT voltmeter 2 The only source of X RAY radiation in this TV is the CRT The TV minimizes X RAY radiation which ensures safety during normal operation To prevent X ray radiation the...

Страница 5: ...und when the TV is in operation Install a suitable isolating transformer of beyond rated overall power when servicing or connecting any test equipment for the sake of safety 4 When replacing ICs use s...

Страница 6: ...ead the parts list in this manual carefully Substitute replacement components which do not have the same safety characteristics as specified in the parts list may create X ray radiation 2 Do not slap...

Страница 7: ...Model no CT 21CBS5CPH doc version 1 0 7 SAFETY SYMBOL DESCRIPTION...

Страница 8: ...3 Allow enough space at least 10cm between the TV and wall or enclosures for proper ventilation 4 Slots and openings in the cabinet should never be blocked by clothes or other objects 5 Please power o...

Страница 9: ...ck and remove CHASSIS REMOVAL 1 Remove cabinet back 2 Discharge the picture tube anode 2nd anode lead to the dag coating picture tube grounding lead 3 Disconnect Degaussing coil socket KE Picture tube...

Страница 10: ...Remove chassis referring to Chassis Removal instructions 2 Place cabinet front face down on the soft surface 3 Remove the screw one ach corner of the picture tube and GENTLY lift the picture tube out...

Страница 11: ...wer switch of the TV set 1 3 Operate the TV for at least 15 minutes 1 4 Degauss the TV set using a specific degaussing coil 1 5 Set the brightness and contrast to maximum 1 6 Counter clockwise rotate...

Страница 12: ...nvergence is obtained 2 2 Circumference convergence adjustment 2 2 1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting 2 2 2 Temporarily put the first wedge between the...

Страница 13: ...alance Adjustment Generally white balance adjustment is made with professional equipment It s not practical to get good white balance only through manual adjustment For TVs with I C bus control change...

Страница 14: ...away from the TV 1 5 Repeat the above steps until the TV is degaussed completely 2 Confirmation and Adjustment for Voltage Caution B voltage has close relation to high voltage To prevent X ray radiat...

Страница 15: ...ved 4 1 After removing the back cover look for the FBT on the main PCB There should be a FCB on the FBT 4 2 Power on the TV and preheat it for 15 min 4 3 Receive a normal TV signal Rotate knob of the...

Страница 16: ...f the screen To exit from the S mode turn off the TV set by the POWER button on the remote control Caution The user service mode adjustment can be changed only when service personnel adjust the whole...

Страница 17: ...Model no CT 21CBS5CPH doc version 1 0 17...

Страница 18: ...Model no CT 21CBS5CPH doc version 1 0 18...

Страница 19: ...Model no CT 21CBS5CPH doc version 1 0 19...

Страница 20: ...Model no CT 21CBS5CPH doc version 1 0 20 STRUCTURE and CHASSIS FUNCTION DESCRIPTION 1 BLOCK DIAGRAM...

Страница 21: ...ium TVs provides much more convenience for manufacturing and technical service It includes 2IN1 IC TMPA8873PSANG 4VB6 for PAL NTSC small signal processing and bus control EEPROM AT24C16 for data memor...

Страница 22: ...ed in a 64 pin shrink DIP package The MCU contains 8 bit CPU ROM RAM I O ports timer counters A D converters an on screen display controller remote control interfaces IIC bus interfaces and the Closed...

Страница 23: ...Model no CT 21CBS5CPH doc version 1 0 23 2 FEATURE...

Страница 24: ...Model no CT 21CBS5CPH doc version 1 0 24 3 BLOCK DIAGRAM...

Страница 25: ...are controllable through the IIC bus of the internal connections 2 Power Supply TMPA8873 has some power supplies and GND pins Power supplies related MCU must be applied at the first Power supplies for...

Страница 26: ...Model no CT 21CBS5CPH doc version 1 0 26 5 TERMINAL INTERFACE...

Страница 27: ...Model no CT 21CBS5CPH doc version 1 0 27...

Страница 28: ...Model no CT 21CBS5CPH doc version 1 0 28...

Страница 29: ...Model no CT 21CBS5CPH doc version 1 0 29...

Страница 30: ...Model no CT 21CBS5CPH doc version 1 0 30 SIGNAL PROCESSOR BLOCK...

Страница 31: ...Model no CT 21CBS5CPH doc version 1 0 31...

Страница 32: ...Model no CT 21CBS5CPH doc version 1 0 32...

Страница 33: ...Model no CT 21CBS5CPH doc version 1 0 33...

Страница 34: ...Model no CT 21CBS5CPH doc version 1 0 34 Microcontrollers Descriptions MROM version TMPA8873CMANG CPANG CRANG CSANG...

Страница 35: ...n pin 7 The TFA9842AJ contains a unique protection circuit that is solely based on multiple temperature measurements inside the chip This gives maximum output power for all supply voltages and load co...

Страница 36: ...Model no CT 21CBS5CPH doc version 1 0 36 3 Block Diagram...

Страница 37: ...Model no CT 21CBS5CPH doc version 1 0 37 4 2 Pin Description...

Страница 38: ...iers 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 Circu...

Страница 39: ...otive Grade and Extended Temperature Devices Available 8 lead PDIP 8 lead JEDEC SOIC 8 lead MAP and 8 lead TSSOP Package 2 wire Serial EEPROM AT24C01A 1K 128 x 8 AT24C02 2K 256 x 8 AT24C04 4K 512 x 8...

Страница 40: ...ssed in detail under the Device Addressing section The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may be addressed on a single bus system The A0 pin is a...

Страница 41: ...nternally organized with 32 pages of 8 bytes each the 2K requires an 8 bit data word address for random word addressing AT24C04 4K SERIAL EEPROM Internally organized with 32 pages of 16 bytes each the...

Страница 42: ...wer MOSFET with a high precise error amplifier The ICs feature fewer external components small size and standard power supply The series STR G8600 use Chip on Chip technology with the same operation p...

Страница 43: ...Model no CT 21CBS5CPH doc version 1 0 43 SERVICE DATA OF KEY ICs Table 16 Ground Resistance of TMPA8873 Pins...

Страница 44: ...Model no CT 21CBS5CPH doc version 1 0 44 Table 17 Operating Voltage of TMPA8873 N202 s Pins...

Страница 45: ...Model no CT 21CBS5CPH doc version 1 0 45 Table 18 Functions and Service Data TFA9842J s Pins Table 20 Functions and Service Data LA78040 s Pins...

Страница 46: ...Model no CT 21CBS5CPH doc version 1 0 46 Table 21 Functions and Service Data of AT24C08 16 Pins Table 22 Functions and Service Data of STR G5653 S Pins...

Страница 47: ...Model no CT 21CBS5CPH doc version 1 0 47 APPENDIX...

Страница 48: ......

Страница 49: ...2M10 CERAMIC CAP CD85 E2GA102MYHS 52582102M30 CERAMIC CAP CT81 1KV 10C 2B4 1000PFM 4 C805 C806 C807 C808 52592471K30 CERAMIC CAP CT81 2KV 10C 2B4 470PFK 1 C818 50640022840 CERAMIC CAP CT1 500V 06C 2B4...

Страница 50: ...10X 35V 100 FM 1 C303 52617010MV0 ELECTROLYTIC CAP CD110X 50V 1 FM 2 C306 C304 611120RU251 DIODE 2CZRU2 1 VD302 61216075075 DIODE ZENER 1Z75 1 VD301 50620071680 CARBON RES RT13 0 166W 27 J 1 R004 5111...

Страница 51: ...S RT13 0 166W 680 J 1 R621 51113103JU0 CARBON RES RT13 0 166W 10K J 4 R603 R604 R601 R602 51113153JU0 CARBON RES RT13 0 166W 15K J 2 R605 C601 50620071640 CARBON RES RT13 0 166W 24K J 2 C602 C603 5062...

Страница 52: ...OLYTIC CAP CD110X 50V 10 FM 1 D903 50640061890 ELECTROLYTIC CAP CD110X 50V 22 FM 1 D904 61411075DT0 DIODE 1N4148 6 D905 61411075DT0 DIODE 2CK75D D906 V905 V904 V901 V902 62210150YW0 AUDION 3CG1015 Y 1...

Страница 53: ......

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