Samsung PLK405WX/XAC, Service Manual

Page: 29 / 101

Alignment and Adjustments
Samsung Electronics 5-9
5-6-1 LCD Control Board PLL Adjustment (CNL06)
1. Input a color bar signal.
2. Connect RPD,FPD to an oscilloscope, and check the waveforms (1V/div, 20
µ
s /div).
5-6-2 Signal Center Adjustment
1. Input a 5-STEP or 7-STEP signal (COLOR OFF).
2. Connect TPL304 (G1) to an oscilloscope, and check the waveforms (2V/div,10
µ
s /div).
5-6-3 Common Voltage Adjustment
1. Connect CNL08 (COMMON) to an oscilloscope (1V/div, 10
µ
sec/div).
2. Set the common control (#18) to DC 6.8V.
5-6-4 Center Convergence Adjustment
1. Input a lion head pattern from a pattern generator.
2. Adjust the LCD Horizontal/Vertical POS (#24, #25).
5-6-5 SH Position Adjustment
1. Input a lion head pattern from a pattern generator.
2. Adjust the SH position (#26) to balance the position of the sample/hold pulse.
5-6 Circuit Adjustments
RPD
FPD
Adjust so that the DC level
of RPD becomes 2.5V
Adjust so that the DC level of
FPD becomes 2.5V
Adjust the signal center (#19) so that the DC level of the signal center becomes 7V.
center