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File name FB795C_6B.pdf

< OSD Control > H.V H-Sync Sig V-Sync Sig I2C DATA(SDA) 12V 5V I2C R/G/B Bias 15V I2C R/G/B Contrast OSD IC (IC301) CUT OFF CONTROL 125V 8V I2C CLOCK(SCL) Screen G1 MICOM (IC401) R G B VIDEO PRE-AMP (IC302) DY CDT VIDEO MAIN AMP (IC303) Signal Cable Heater ( 6.3V ) BRIGHTNESS CONTRAST H / V POSITION H / V SIZE SPCC TRAPIZODE PIN BALANCE PARALLELOGRAM CORNERTRAP DDC ON/OFF CLAMP BEEP TILT RECALL DEGAUSS COLOR CONTROL MOIRE LANGUAGE 5V HConver gence I2C Dynamic Focus Static Focus VIDEO LEVEL OSD POSITION PURITY CONVERGENCE SCL / SDA H/V Sync, PWM Control Sig 12V -12V 15V 30V X-RAY Protection Circuit PURITY COIL 6.3V I2C Purity Control 15V Circuit E2PROM (IC402) 15V I2C H/V Sync H-DRV H/V Sync Processor ( IC701 ) TDA4856 V-OUT ( IC601) TDA8172 H.V CONTROL H-OUT ( Q708) I2C Vertical Blanking, Brightness Control -120V 6.3V TILT COIL BLOCK DIAGRAM DEGAUSSING COIL - 14 12V 23V -12V SMPS TRANS (T901) 190V 125V 80V 15V 12V 6.3V -12V B-DRV DC/DC Converter 190V DPM CONTROL CIRCUIT VOLTAGE FEEDBACK H-Linearity Correction Sub Trans T903 5V VOLTAGE FEEDBACK TILT Control Circuit Degaussing Circuit FBT ( T701 ) 12V DUMMY TRANS 900V Dynamic Focus Circuit Auto Beam Limit Line Filter POWER INPUT 100~240VAC (50/60Hz) SMPS CONTROL (IC901) SubTrans Control (IC903) DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. This is used for suppressing noise of power input line flowing into the monitor and/or some noise generated in this monitor flowing out through the power input line. That is to say, this circuit prevents interference between the monitor and other electric appliances. 2. Degauss Circuit & Coil. The degauss circuit consists of the degaussing coil, the PTC (Positive Temperature Coefficient) thermistor (TH901), and the relay (RL901). This circuit eliminates abnormal color of the screen automatically by degaussing the slot mask in the CDT when turn on the power switch. When you need to degauss while using the monitor, select DEGAUSS on the OSD menu. 3. SMPS (Switching Mode Power Supply). This circuit works with power of 110-240Vac (50/60Hz). The operation procedure is as follows: 1) AC input voltage is rectified and smoothed by the bridge diode (D901) and the capacitor (C907). 2) The rectified voltage (DC voltage) is applied to the primary coil of the transformer (T901). 3) The control IC (IC901) generates switching pulse to turn on and off the primary coil of the transformer (T901) repeatedly. 4) Depending on the turn ratio of the transformer, the secondary voltages appear at the secondary coil of the transformer (T901). The switch IC(IC903) contrals input-pulse-width and generates secondary voltage by sub-transformer (T903). 5) These secondary voltages are rectified by each diode (D906, D907, D908, D909, D910, D911, D912, D913) and operate the other circuits. (Deflection, Video Amplifier, etc.) 4. Display Power Management Circuit. This circuit control power consumption of the monitor by detecting H and V sync signal. There