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TV - Conventional CRT, LCD Projectors, TFT, Plasma, Big Screen, HDTV, Home theater - Service manuals, repair tips

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Descr: LG TV cf-20-21s12e(mc84a) 84aadj.pdf
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ADJUSTMENT Y Safety Precautions 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to TUNER 6700VPF002A(ALPS) 6700VPF003B(LGEC) prevent the risk of electric shock and protect the AGC Voltage 3.5 ! 0.1V 2.7 ! 0.1V instrument. 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. 4. The adjustment must be done by the correct appliances. But this is changeable in view of productivity. : Screen Voltage Adjustment 5. Unless otherwise noted, set the line voltage to 230Vac!10%, 50Hz. Test Point : RK (Red Cathode of CPT Board) Adjust : Screen Control of FBT Y Test Equipment required 1. RF signal generator (with pattern generator) 2. DC Power Supply 1) Tune the TV set to receive a digital pattern. 3. Multimeter (volt meter) 2) Press PSM (RED) button on remote controller. (standard 4. Oscilloscope picture) 5. Color analyzer 3) Connect the probe of oscilloscope to the RK (Red Cathode) of CPT Board. 4) Adjust Screen Volume of FBT so that the waveform is the same as below figure. : RF AGC (Automatic Gain Control) Adjustment Horizontal Test Point : AGC TP (J2) FlyBack Time Black level Adjust : Remote Control 140Vp-p The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions. White level Readjustment of RF AGC should not be necessary unless GND for dc unusual local conditions exist, such as ; The waveform of RK(Red Cathode) of CPT Board 1) Channel interference in a CATV system. 2) Picture bending and/or color bea

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