LG Electronics 30FZ4D Adjustment Instructions, Contrast Bright APC on Tint Color Sharpness

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions are applied to the AC-02SA/C chassis.

2.Notes

(1)Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of an isolation transformer will help protect test instruments.

(2)Adjustments must be done in the correct order.

(3)The input voltage of the receiver must remain at 120V±10% while adjusting.

(4)The receiver must be operated for about 20 minutes prior to the adjustment.

[Never operate the set over 10 minutes with a still picture because a fluorescent material may get damage.

3.Focus Adjustment

A

(1) Set Picture condition to “APC ON”.

CONTRAST : 100

BRIGHT : 50

APC ON TINT : 55

COLOR : 0

SHARPNESS : 55

(2)Set the Aspect ratio to Wide Mode.

(3)Receive a Cross Hatch Pattern, adjusting the FOCUS Knob on the flyback transformer for the best focus in the area designated “A” above.

[Heat run over 15 minutes before adjustment.

4-2. Adjustment

(1)Select EZ Adjust 3. CUT-OFF, by pressing the ADJ key on the SVC Remote control.

When it enters to adjustment mode, the pattern from a signal generator is being selected, it becomes with Normal image 16:9 and the CUT-OFF DRIVE data setting 31.

(2)Connect the oscilloscope ground lead to GND on the CPT board and the probe to the GK pin connector of the CPT socket.

Using the SCREEN knob on the Flyback Transformer, adjust the black level voltage to 180±2V.

180±2V

CUT-OFF Adjustment

(SCREEN voltage adjustment OSCILLOSCOPE, 100:1 PROBE, VOLTS/DIV : 0.5V/DIV SEC/DIV : 5us, The TRIGGER MODE it puts in the TV-H)

5. Deflection Adjustment

5-1. Preliminary Steps

Select EZ Adjust 1. Raster, Cent, H/V Size by using the ADJ key on the SVC Remote control.

In the adjustment mode a Digital Pattern signal signal is displayed.

5-2. Raster V-Center(V.Center) Adjustment

Select 62. V-Postition in the adjustment mode and adjust it to position the vertical center line in vertical center of the CPT.

5-3. Vertical Deflection Size Adjustment

(Overscan : 10%)

(1)Select 59. V-SIZE in the adjustment mode.

(2)Adjust until the smaller inscribed circle coincides with the outer frame of screen.

(3)Select 95. LO-VLIN or 94. UP-VLIN and adjust until the larger inscribed circle coincides with the outer frame of screen.

4.CUT-OFF Adjustment (Screen Voltage Adjustment)

4-1. Test equipment LO-VLIN UP-VLIN

(1)Service remote control

(2)Oscilloscope(100:1) Probe

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