Modelos:
CN-14/20D90
CN-14/20D90G
CN-14/20D99
CN-14/20D99G
CHASIS: NC-6HA
♦
DESCRIPCIÓN DE CIRCUITOS
AVR ELECTRONICS, Santiago de Chile, Comuna Comuna de Santiago Centro, Calle Luis Cruz Martínez # 2370, F/FAX: 554 65 05
Dpto., de Investigación, Desarrollo y Capacitación Técnica de TV & Video. Escríbanos a nuestro E-Mail:
[email protected]
Visítenos en nuestra URL: http://www.geocities.com/avrelec/
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CONTENI DOS GENERALES GENERAL ES A. DIAGRAM A DE BLOQUES GENERAL GENERAL DEL CHASIS B. DESC DESCRI RI P CIÓN DE CIRCUITOS
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D I A G R A M A
D E B L O Q U E S G E N E R A L D E L C H A S I S
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1. LA FUENTE DE ALI MENTACIÓN 1-1.
Diagrama de la Fuente de Alimentación SMPS
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1-2.
El IC801 (STR-S5707 )
El STR-S5707 y el STR-S5708 están respectivamente diseñados para cumplir con los requerimientos de alta integración y confiabilidad de las fuentes de alimentación SMPS del tipo convertidores cuasi-resonantes cuasi-resonantes fuera de línea. Cada uno de éstos circuitos integrados (STRS5707 y 5708) incorporan el circuito de control del primario y el circuito excitador proporcional con un transistor conmutador de potencia (tipo SW) bipolar de alto voltaje y de tercera generación. Los parámetros cruciales del sistema tales como los l os tiempos máximos y mínimo del ENCENDIDO y del APAGADO del TR SW incorporado, vienen ya fijados de fábrica. La limitación de ciclo a ciclo, la l a interrupción de operación por deficiencia de voltaje con histérisis, la protección de sobrevoltajes, y la interrupción de operación térmica protegen a éstos circuitos integrados durante todas las condiciones, ya sean normales o ya sea de sobrecarga. La protección del sobrevoltaje y la protección térmica son retenidas t emporalmente después de un breve retardo. Se ha incluido un circuito amplificador de error del lado primario con su propia referencia para facilitar la regulación a partir de un bobinado auxiliar o de polarización del transformador conmutacional conmutacional (“CHOPPER”). El circuito de inhibición versátil de triple nivel incluye la sincronización del tiempo del APAGADO requerida para establecer el funcionamiento cuasi-resonante. La función de inhibición además ha sido expandida para iniciar el funcionamiento en la modalidad de STAND-BY en la cuál la fuente de alimentación al imentación genera una pequeña fracción de la potencia de salida en estado estable. Los dobles requerimientos de aislación dieléctrica y de de impedancia transiente térmica y la resistencia térmica de estado estable se satisfacen en éstos sencillos circuitos integrados encapsulados en una pastilla sobremoldeada de una sola hilera de terminales. Las características esenciales de éstos C.I. son las siguientes: Funcionamiento Cuasi-Resonante para una Alta Eficiencia y Baja EMI !" Modalidad de STAND-BY de Salida de Baja Potencia. !" La Realimentación Indirecta desde el Bobinado Auxiliar Reduce la Cantidad de Componentes Externos. !" Protección de Sobrecorriente de Pulso a Pulso !" Protección de Sobrevoltaje y Protección Térmica Retenidas Temporalmente. !" Transistor Conmutacional de Tercera Generación con Excitación Proporcional. !" Los Tiempos Máximos de ON (Encendido) y OFF (Apagado) se Sitúan Durante la Fabricación. !" Interrupción forzosa del Funcionamiento por Deficiencia de Voltaje (UVLO) con Histérisis !" SIP Sobre-Moldeado con Disipador de Calor Integral Aislado. !"
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1-2-1. DIAGRAM A DE BLOQUES IN TERNOS DEL STR-S5707 STR-S5707 & STR-S5708 (I C801)
UVLO: Under Voltaje Lock-Out (“I nterrupción forzada del funcionam iento por Deficiencia Deficiencia de Voltaje”). Este vigila el voltaje aplicado al Pin 9 del IC. Si éste voltaje desciende por debajo de cerca de +5VDC, el UVLO produce un ALTO lógico a ser aplicado al circuito generador de VREF interno, inhibiéndolo de operar, e interrumpiendo el funcionamiento del IC por algunos instantes. Luego el IC reintenta partir y si la condición de deficiencia de voltaje se mantiene, se repite el ciclo antes expuesto. TSD: Thermal Shut-Down (“I nterrupción del funcionamien to Térmica”). Cuando la temperatura operativa del IC alcanza a 150°C de calor, el circuito TSD produce un nivel lógico ALTO que es ingresado al circuito OR interno, el cuál a su vez saca un ALTO hacia el circuito LATCH y corta el funcionamiento del IC protegiéndolo de daños. OVP: Over-Voltage Protection (“ Protección del Sobrevoltaje). Este circuito vigila el voltaje que se ingresa en el terminal 9 del IC (VIN). Normalmente éste voltaje deberá ser de entre 8VDC a 9VDC. Con un voltaje de 10VDC, el circuito ci rcuito OVP se acciona produciendo un
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FAULT LATCH: Retención Temporal del a pagado por Fallo. Este circuito cuando es accionado internamente por haberse detectado una condición anormal de temperatura de funcionamiento, una condición anormal de voltaje de entrada (sobrevoltaje del Pin 9), o una condición anormal de voltaje en el Pin 6 (INH) del IC, bloquea y mantiene bloqueado el funcionamiento interno del excitador proporcional y del oscilador, impidiendo durante un período de cerca de 1 minuto máximo que el oscilador produzca pulsos. Con ello, la SMPS queda esencialmente muerta, pero el IC resulta protegido de daños. Cuando ocurra esto, desenchufe la fuente de alimentación de la entrada de AC de línea y vuelva a enchufarla después de unos 30 segundos de espera. Esto para dar tiempo para que se deshabilite la traba del funcionamiento por seguridad impuesta internamente por el circuito de Retención Temporal Temporal (“ LATCH”). TABLA DE FUNCIÓN Y DE VOLTAJES NORMALES PARA CADA PI N DEL IC801 PI N 1
NOMBRE C
2
E
3
B
4
SINK
5
OCP
6
INH (F/B)
7
SENSE
FUNCIÓN Y VOLTAJE DC Colector del PTR Conmutacional de Potencia interno. Entrada de voltaje principal de +290VDC vía el bobinado primario del T801. Emisor del PTR Conmutacional de Potencia interno. Conectado a GND a través de un resistor externo para el muestreo de la corriente funcional del PTR (para el OCP). (Típico = -0.17VDC) Base del PTR interno. Se ingresa la señal de pulsos PWM amplificada proporcionalmente que se saca desde el Pin 8 del IC, vía un capacitor y un resistor. Típico = 0.2VDC. Terminal de vertedero de corriente y de temperatura. Va conectado al disipador aislado integral del IC. (0VDC) ( 0VDC) Entrada para la protección de sobrecorriente integrada en el IC. Normalmente éste terminal trabaja con una tensión de entre –0.88VDC y – 1.12VDC. Lo típico es de –1.0VDC. Entrada para la función de inhibición del funcionamiento del IC. Normalmente éste terminal trabaja con tensiones t ensiones de entre 1.4VDC a 2.0VDC. Cuando se ingresan entre 0.65V a 0.85V aquí, la oscilación interna es detenida por breves momentos. Pero cuando se ingresan entre 3.2V a 5.8V aquí, entonces la oscilación interna es detenida y la condición de apagado del IC es retenida temporalmente mientras la SMPS esté conectada a la red. Este terminal t erminal trabaja bien con voltajes de entre 1.4V a 2.0V (y la oscilación interna se mantiene sincronizada establemente) Entrada del circuito sensor del IC. La corriente normal de ingreso aquí es de 3.2mA. Este terminal trabaja normalmente con voltajes comprendidos entre 31.7V a 32.3V, siendo lo típico, 32.0VDC. Salida de la forma de onda PWM excitadora de la base del PTR
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1-3.
La Modalidad de STAND-BY
1-3-1. La Partida del Funcionami ento de la SMP SMP S. Al principio, el voltaje de línea es acondicionado en nivel a través de los resistores R802 y R803 (los resistores de partida), y el capacitor C809 es cargado. Y el voltaje de partida es aplicado al Pin 9 del IC801. Cuando el voltaje alcanza a 8V, el IC801 comienza a operar. 1-3-2. Funcionami ento de la Modalidad de STAND-BY. Cuando el IC801 empieza a funcionar, empiezan a aparecer los voltajes en los bobinados secundarios del Transformador Conmutacional T801. Estos voltajes dependen del tiempo del encendido (ON) del transistor de potencia (PTR) dentro del IC801, como analizaremos a continuación: Ib (R824 # R826 # ZD805 # Q807) Ic ( R822 # IC802 # Q805) La corriente de colector que circula a través de los pines 1 y 2 del foto-acoplador IC802 (4N35GV), da origen a la corriente de realimentación que se genera en el fototransistor interno del IC802 (pines 3 y 4). Esta corriente de realimentación se suministra al IC801 a través del terminal 6 (INH). Y es la que se encarga de controlar el tiempo de encendido del PTR interno del IC801. Si la corriente aplicada al Pin 6 del IC801 aumenta, entonces el tiempo de ON del PTR se disminuye, y los voltajes secundarios del T801 disminuyen también. Si la corriente aplicada al Pin 6 del IC801 disminuye, entonces entonces el tiempo de ON del PTR se aumenta, y los voltajes secundarios del T801 aumentan también. Cuando el voltaje del capacitor C819 sobrepasa los 13V, la corriente de colector del Q802 aumenta. De ésta forma aumenta la corriente de realimentación aplicada al Pin 6 del IC801 y disminuye el tiempo de encendido del PTR interno del IC801. Finalmente, el voltaje en el C819 disminuye consecuentemente. A través de éstas operaciones, el voltaje en el capacitor C819 es regulado a alrededor de 13V. ♦
Línea de alimentación del microcomputador de control: T801 (Pin 12) # R820 # D821 # C819 # R813 # ZD803
#
C826
#
IC01 (Pin 12)
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De éste modo tendremos nuevamente una corriente de realimentación que de ésta forma regulará el voltaje del C820 (& C822) a 113V. ♦
♦
Línea de alimentación del microcomputador IC01: T801 (Pin 12) # R813 # ZD803 # C826 # IC01 (Pin 12). Línea de alimentación del IC801: T801 (Pin 1) # D802 (D805) # IC801 (Pin 9).
1-3-4. La Regulación. Si el voltaje en la línea de 113V disminuye, el voltaje del C819 disminuirá causando que que la corriente que se canaliza hacia el Pin 1 del fotoacoplador (IC802) disminuya también. De ésta forma, la corriente de realimentación ingresada al Pin 6 del IC801 disminuye ocasionando asín un tiempo de encendido del PTR más prolongado y una corrección de voltaje en la línea de 113V (regulación). Las constantes de tiempo para los tiempos de encendido y apagado estándares del IC801 vienen predeterminadas de fábrica mediante capacitores internos ligados estrechamente al oscilador. Las constantes de tiempo de carga y descarga de cada capacitor están directamente influenciadas por la corriente de realimentación ingresada en el Pin 6 del IC801.
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1-4.
LOCALIZACIÓN DE FALLAS EN LA SMPS.
1-4-1. NO ENCIEN ENCIEN DE LA SMP SMP S.
Desconecte la línea de R813, la línea de 12V, la línea de 113V y cortocircuite entre C y E el Q805 y el Q808
SI
El voltaje en el Pin 9 del IC801 ¿Es mayor que 8V?
NO
¿Aparecen 112VAC en el Pin 14 del T801?
SECCIÓN DE LA SMPS ESTÁ OK
NO ¿Existe voltaje de DC
SI
NO
Verifique el estado del
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MEMO
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MEMO
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2. EL MI CROCONTR CROCONTR OLADOR DEL SISTEMA 2-1.
Visi ón General
El IC01 (LG8608-22D o LC864725A-5F87) LC864725A-5F87) es el chip microcomputador de control de éste chasis de televisor. El IC02 (AT24C04-10PC) es la memoria EEPROM. El IC01 (MICOM) tiene las siguientes características generales: DIP de 42 pines, de diseño C-MOS Controlador de caracteres del OSP (192 caracteres) !" Rebanador de datos de subtitulajes cerrados (soporta un ajuste automático para XDS) !" Múltiples salidas PWM (6 canales de 7 bits) !" Receptor decodificador de control remoto !" Funcionamiento con un solo oscilador de Reloj de 32kHz. !" Entradas de A/D de 3 canales y 5 bits. !" Dos buses de comunicación de I²C y un (1) bus de comunicación trifilar para el sintonizador !" !"
2-2.
Descrip ción General
El IC01 se comunica con los restantes IC’s vía los dos buses de comunicación de I²C. El primer Bus (Pines 1 y 2) sostiene la comunicación con el IC02 (EEPROM), y el IC601 (decodificador de MTS & procesador de sonido). El segundo Bus (Pines 3 y 4) sostiene la comunicación con el IC501 (procesador de V/C/D) exclusivamente. El bus trifilar de los pines 5, 39 y 40 maneja las operaciones relativas a la sintonización de canales en el sintonizador a varactor, TU101. El cristal del reloj de 32kHz (X10) está conectado a los pines 10 y 11 del chip. El control del
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2-4.
La Matriz de Teclas (“ Teclado Digital”)
Este chip de microcomputador emplea un sistema de matriz de teclas en el teclado (muchas veces referido como el "Teclado Digital”), que hace uso de pulsos de barrido o exploración para el teclado generados periódicamente por el MICOM dentro de tiempos ti empos específicos y que al presionar una tecla dada, un pulso es retornado a un puerto de entrada específico pero con un tiempo (temporización) específica. Los puertos de entrada del teclado son los pines 35, 36, 37 y 38. Los puertos de salida de los pulsos de exploración del teclado son los pines 41 y 42 del chip.
2-5.
La Reiniciación (“ RESET”)
El terminal de entrada para la señal de la reiniciación del MICOM es el Pin Pi n 16. Para asegurar la inicialización del MICOM, el Pin 16 (RESET) debe ser mantenido a nivel lógico BAJO, por aproximadamente 1 ms; después el voltaje de alimentación al imentación de +5V estará en nivel normal. Esta reiniciación se consigue a través t ravés del IC03 (KIA7042), el circuito integrado reiniciador del MICOM. Cuando inicialmente se enchufa el televisor a la l a red, la SMPS empieza a operar y genera los voltajes de STAND-BY secundarios. Gracias a esto, aparece el voltaje de alimentación de +5V para el MICOM y la EEPROM. El MICOM se alimenta en el Pin 12. La memoria EEPROM (IC02) se alimenta en el Pin 8. En éste instante que llega l lega el voltaje de +5V a esos pines del IC01 y del IC02, el IC03 (RESET) recibe en el Pin 3 el voltaje de +5V. Al ocurrir esto, internamente el IC03 coloca en BAJO lógico la salida del Pin 1 y con ello pone en BAJO lógico el Pin 16 del MICOM (IC01). Este estado BAJO lógico es mantenido por un espacio de alrededor de 1ms aproximadamente, tiempo durante el cuál se reinician todos los registros internos del MICOM para el adecuado funcionamiento del software de control del MICOM. Luego de 1ms de tiempo, el nivel se torna ALTO (+5V) en el Pin
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2-9.
Líneas del Bus de I²C (SDA y SCL) SCL)
Dos buses de comunicación de I²C se usan en éste MICOM. El 1° Bus se encuentra en los pines 1 y 2 del chip. El 2° Bus se encuentra en los pines 3 y 4 del chip. Estos buses de esos pines son para realizar la transferencia de datos desde o hacia los circuitos asociados. En el caso del primer bus, la l a transferencia de datos es hacia el decodificador de MTS y la memoria EEPROM. Con ésta última, últi ma, la comunicación o transferencia es bi-direccional. En el caso del segundo bus, la comunicación o transferencia de datos es hacia el procesador de V/C/D. Si existe algún tipo de problema en ésta líneas, dependiendo del bus que tenga el problema, el síntoma podrá variar desde que el televisor no encienda, no haya sonido Imagen OK), no haya control de la modalidad de recepción del MTS, o no haya imagen (sonido OK), no haya control del brillo, o del contraste, del volumen, etc.
2-10. Métodos de Búsquedas de Fallas para la Sección Sección Microcontroladora del Sistema. 2-10-1. No Enciende el Televisor.
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2-10-2. No Funciona el Teclado 1. ¿Algunos de los terminales 35, 36, 37 y 38 del IC01 tiene nivel lógico BAJO? Lo normal es que no, pero si una de esas entradas de identificación de teclas está en nivel BAJO permanentemente, entonces el técnico deberá sospechar potencialmente en el MICOM defectuoso. De todas maneras, antes de concluir tajantemente en el MICOM defectuoso, el técnico deberá revisar el estado de los diodos D4, D5, D6, D7 y D8. Si éstos diodos no presentan fugas, o cortocircuitos, entonces proceda a reemplazar el MICOM. Pero si las entradas de identificación de teclas de esos pines están todas OK (Nivel ALTO), entonces prosiga al siguiente paso. 2. ¿Aparecen pulsos de exploración del del teclado desde los pines 41 y 42 del MICOM? MICOM? Estos pulsos se producen internamente en el MICOM sin intervención de circuito externo alguno. Cada pulso de cada puerto (Pin) de salida tiene una temporización diferente uno con respecto del otro. Si no aparecen los pulsos en una o ambas de las salidas de los pines 41 y 42 del chip, entonces revise de todas formas por un cortocircuito de los diodos D3 y D9. Si no presentan fugas o cortocircuitos, entonces el MICOM estará defectuoso y deberá ser reemplazado. Si todo está OK sin embargo, y el problema subsiste aún (teclado no funciona), entonces proceda a revisar el patrón de pistas del circuito impreso por pistas
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2-10-4. No Funciona la Memoria. 1. Verifique la forma forma de onda de los pines 1 y 2 del IC01. Si se ven mal o una de ellas no está presente, entonces verifique primeramente el estado del patrón de pistas del circuito impreso. Si todo se ve bien y aun subsiste el problema, entonces sospeche del IC01. Pero si las formas de ondas están OK, entonces vaya al siguiente paso. 2. ¿Se aplican +5V al Pin 8 del IC02? IC02? Si no es así, verifique entonces el estado de la línea de 5V. Si se están aplicando +5V en el Pin 8 del IC02, entonces vaya al siguiente paso. 3. Verifique la forma de onda de los pines 5 y 6 del IC02. Si se ven mal, entonces verifique verifique el estado del patrón de pistas del circuito impreso. Pero si las formas de onda se ven bien, entonces simplemente proceda a reemplazar el IC02. Una vez reemplazado, proceda a ajustar los ítems del Menú de Servicio del televisor. 4. Si el problema de memoria subsiste con con todo lo anterior, anterior, entonces reemplace reemplace el IC01 además. 2-10-5. No Funciona el Control del Balance, el Grave, el Agudo y/ o el Volumen.
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3. EL P ROCESAD ROCESADOR OR DE V/ C/ D (I C501: C501: LG7607) 3-1.
Descripción General del IC501 (LG7607/ LA76075)
El IC501 es el chip del procesador de señales de TV NTSC que incorpora los circuitos requeridos
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La sección procesadora de señal de Luminancia (Y) es similar a la de otros chips de procesadores de V/C/D analizados en otras Guías Técnicas de otras marcas de televisores de color controlados por Bus de I²C. La FI de Video (VIF) conformada en onda mediante el filtro SAW, Z101, procedente del sintonizador TU101, es acoplada a los pines 10 y 11 del chip. La señal de FI es procesada en el chip (amplificación y AGC, Demodulación sincrónica del video, obtención del voltaje del AFT, obtención del voltaje del AGC de RF, inversión de ruido del video, trampa de
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4. LA DEFLECCI DEFLECCI ÓN V ERTI CAL (I C301: LA78 40) 4-1.
Descrip ción General.
La señal de la excitación vertical (forma de onda de rampa V) viene desde el Pin 17 del IC501, el
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