LG FB775B free download

File name flatron-FB775B.pdf

[ OSD Control ] H.V Signal Cable R G B VIDEO PRE-AMP (IC302) DY VIDEO MAIN AMP (IC303) CDT Heater ( 6.3V ) H-Sync Sig V-Sync Sig I2C DATA(SDA) I2C CLOCK(SCL) Screen G1 8V MICOM (IC401) 5V I2C 12V R/G/B Bias 15V I2C R/G/B Contrast OSD IC (IC301) 8V REG. (IC304) CUT OFF CONTROL 130V 8V Dynamic Focus Static Focus 5V H / V POSITION H / V SIZE SPCC TRAPIZODE PIN BALANCE PARALLELOGRAM ROTATION TOP CORNRE BOTTOM CORMOR RECALL DEGAUSSING COLOR CURVE MOIRE LANGUAGE RECALL SCL / SDA H/V Sync, PWM Control Sig 12V 15V 40V X-RAY Protection Circuit Vertical Blanking, Brightness Control - 120V E2PROM (IC402) 15V I2C TDA4856 H/V Sync H/V Sync Processor ( IC701 ) I2C TILT COIL BLOCK DIAGRAM DEGAUSSING COIL - 12 15V SMPS TRANS (T901) 175V 75V 15V -12V 6.3V 5V H-DRV B-DRV SMPS CONTROL (IC901) DPM CONTROL CIRCUIT VOLTAGE FEEDBACK 175V 6.3V TILT Control Circuit Degaussing Circuit V-OUT (IC601) TDA4866 30V FBT ( T701 ) H-OUT (Q706) B+ H-Linearity Correction 6.3V Line Filter DC/DC Converter Dynamic Focus Circuit Auto Beam Limit POWER INPUT 100~240VAC (50/60Hz) D/D Feed Back DESCRIPTION OF BLOCK DIAGRAM 1. SMPS(Switching Mode Power Supply) When you turn on the power switch, the operating procedure is as follows: 1) The AC line voltage is rectified by the bridge diodes D901, D902, D903 and D904. 2) The control IC(IC901) starts switching and generates switching pulses in the primary turns of the SMPS transformer (T901). 3) The switching pulses of the primary turns are induced the secondary turns of the transformer by the turn ratio. These pulses are rectified by each diode (D920, D922, D923, D924 and D926) . 4) Each rectified DC voltage (75V, 175V, 5V, 15V and 6.3V) is supplied to the main circuit. 2. Over Voltage Protection Circuit When the input voltage of IC901 Vin(pin 4) is more than 22.5V(typical), all the secondary voltages of the SMPS transformer (T901) down to low value. 3. Display Power Management Circuit 1) Stand-by and Suspend mode. When no input of horizontal or vertical sync, Q923 and Q930, are turned on and Q920, Q926 are turned off. Then input power consumption is below 15 watts. 2) OFF mode When no input of horizontal and vertical sync, Q923, Q926, Q930 are turned off and Q920 is turned on. Then input power consumption is below 5 watts. 4. X-ray Protection Circuit When the high voltage reaches to 29kV in an abnormal case, the high voltage detector circuit, R734, R717, R718, R719, R785, VR701, IC701 start operation to shut down high voltage circuit. 5. Microprocessor Control Circuit. The operating procedure is as follows : 1) Horizontal and Vertical sync signals are supplied to the microprocessor(IC401). 2) Microprocessor(IC401) discriminates the operating mode from the sync polarity and resolution. 3) After microprocessor reads these adjusted mode data stored at EEPROM, it controls operating mode data through IIC. 4) Users can control screen condition by the OSD, SET, UP, DOWN, RIGHT and LEFT buttons. 6. D/D Convert Circuit. To obtai