LG 8CB adj free download

File name 8CB_adj.pdf

ADJUSTMENT Y Safety Precautions : Screen Voltage Adjustment 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to Test Point : RK (Red Cathode of CPT Board) prevent the risk of electric shock and protect the Adjust : Screen Control of FBT instrument. 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. 1) Tune the TV set to receive a color bar pattern. 4. The adjustment must be done by the correct appliances. 2) Press PSM (RED) button on remote controller. (standard But this is changeable in view of productivity. picture) 5. Unless otherwise noted, set the line voltage to 3) Connect the probe of oscilloscope to the RK (Red 230Vac!10%, 50Hz. Cathode) of CPT Board. 4) Adjust Screen Volume of FBT so that the waveform is the Y Test Equipment required same as below figure. 1. RF signal generator (with pattern generator) 2. DC Power Supply 3. Multimeter (volt meter) Horizontal FlyBack Time 4. Oscilloscope Black level 5. Color analyzer 150 3V for 25" LG CPT 150 3V for 29" LG CPT White level : RF AGC (Automatic Gain Control) Adjustment GND for dc Test Point : AGC TP (J2) The waveform of RK(Red Cathode) of CPT Board Adjust : Remote Control The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions. : Focus Adjustment Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as ; NOTE: This adjustment should be performed after warming up for 10 minutes. 1) Channel interference in a CATV system. 2) Picture bending and/or color beats, which are unusually Test Point : Ob