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Alignment and Adjustments
5. Alignment and Adjustments
5-1 Lens and Mirror Cleaning
1. Mix the alcohol and ethyl in appropriate proportions.
2. Use a clean cotton cloth or a cleaning paper.
3. Clean the top of the lens by turning it as shown. The pattern starts at the
center and proceeds outward, as shown below:
4. Use minimal pressure when rubbing the mirror. Otherwise, the surface
will be damaged.
5-2 Focus Adjustment for projection Lens
1. Loosen the 4 screws that secure the optical
assembly.
FOCUS SECURING SCREW
2. After setting the optical assembly on the front
cabinet, secure the unit temporarily using the two
screws.
3. After applying the liquid crystal panel signal,
input a lion head pattern from a pattern FOCUS
generator. ADJUSTMENT
SCREW
4. Move the focus adjustment screws right and left
until the liquid crystal picture element
is clearly displayed on the screen.
5. Reposition the optical assembly, and fasten all 4
screws.
6. Check the focus adjustment.
7. Repeat adjustments 1~5, if necessary. FOCUS SECURING SCREW
Fig. 5-1
Samsung Electronics 5-1
Alignment and Adjustments
5-3 Liquid Crystal Screen Center Adjustment
After replacing with the new liquid crystal panel, make sure that the liquid crystal screen center is
aligned with the screen center. If they are not aligned, make the following adjustments:
1. Using a hexagonal wrench, loosen the two screws that secure the liquid crystal panel.
Note: Loosen the screws just until the panel can move easily.
2. Using two fingers, lift the liquid crystal upward. (The screen moves downward.)
3. When moving the liquid crystal panel towards the left, the screen moves right (and vice versa).
5. Repeat adjustments 2~4 until the screen center is aligned vertically and horizontally.
6. Using a hexagonal wrench, refasten the two screws.
Fig. 5-2
5-2 Samsung Electronics
Alignment and Adjustments
5-4 Side Panel Controls
ACCESS TO MENU
PROGRAMME SELECTION
VOLUME ADJUSTMENT
LED INDICATORS
POWER
5-4-1 Rear Panel Jacks 5-4-2 Side input jack
Samsung Electronics 5-3
Alignment and Adjustments
5-5 Service Mode Adjustments
5-5-1 MATRIX IC (TDA4780) Adjustment
No. Item Range Initial value Description
00 RED DRIVE 63 19 Adjustment for the R gain
01 GREEN DRIVE 63 14 Adjustment for the G gain
02 BLUE DRIVE 63 23 Adjustment for the B gain
03 RED CUTOFF 63 32 Adjustment for the R cutoff
04 GREEN CUTOFF 63 32 Adjustment for the G cutoff
05 BLUE CUTOFF 63 32 Adjustment for the B cutoff
06 SUB BRIGHTNESS 20 11 Adjustment for the brightness
07 SUB CONTRAST 20 20 Adjustment for the contrast
08 SUB COLOR 20 00 Adjusts the color difference signal level of YUVIN 1
09 PEAK DRIVE LIMIT 63 53 Adjustment for the peak drive limit
10 P.YC DELAY 15 10 Adjustment for the P.YC delay
11 SUB TINT 17 09 Adjusts the center of tint (0 R 9 CENTER 17 G )
12 CORRECTION 63 00 Adjustment for the correction
5-4 Samsung Electronics
Alignment and Adjustments
5-5-2 LCD Interface IC (CXA1853_A) Adjustment
No. Item Range Initial value Description
00 Gamma gain 1 63 41 Adjusts the gain of black side on the gamma curve (R,G.B)
01 R gamma gain 1 63 29 Adjusts the gain of black side on the gamma curve for R
02 B gamma gain 1 63 48 Adjusts the gain of black side on the gamma curve for B
03 Gamma gain 2 63 16 Adjusts the gain of white side on the gamma curve (R,G.B)
04 R gamma gain 2 63 29 Adjusts the gain of white side on the gamma curve for R
05 B gamma gain 2 63 36 Adjusts the gain of white side on the gamma curve for R
06 Gamma ctrl 2 63 34 Adjusts the change point of the white side on the gamma curve (R,G,B).
The smaller the value, the more it moves towards white.
Adjust the DC level of R,G,B signal before doing the gamma adjustment.
07 Main bright 63 59 It determines the change point of the gamma curve. The greater the
value, the darker it gets.
Adjusts the DC level of R before doing the gamma adjustment. It deter-
08 R main bright 63 36 mines the change point of the gamma curve. The greater the value, the
darker it gets.
Adjusts the DC level of B before doing the gamma adjustment. It deter-
09 B main bright 63 37 mines the change point of the gamma curve. The greater the value, the
darker it gets.
Adjusts the limiter voltage of white peak of R,G,B video signal (applied
10 White limit 63 40 to LCD). The greater the value, the lower the limiter
voltage becomes.
Samsung Electronics 5-5
Alignment and Adjustments
5-5-3 LCD Interface IC (CXA1853_B) Adjustment
No. Item Range Initial value Description
00 Gamma ctrl 1 off 63 44 Adjusts the change point of the black side on the gamma curve
(R,G,B). The greater the value, the more it moves towards black
01 Black Stretch On 36 39 Adjusts the change point of the back side on the (R,G,B) gamma
curve. Moves the change point to the white side. The value is always
less than the one of the gamma ctrl 1 off.
02 R gamma ctrl 1 63 33 Adjusts the change point of the back side on the gamma curve for R.
The greater the value, the more it moves towards black.
03 B gamma ctrl 1 63 38 Adjusts the change point of the black side on the gamma curve for B.
The greater the value, the more it moves towards black.
Adjusts the brightness of R, G, B after doing the gamma adjustment.
04 Sub bright 20 04 No change of the gamma curve. The greater the value, the darker it
gets.
Adjusts the brightness of R after doing the gamma adjustment. No
05 R sub bright 63 38 change on the gamma curve. The greater the value, the darker it
gets.
Adjusts the brightness of B after doing the gamma adjustment. No
06 B sub bright 63 48 change on the gamma curve. The greater the value, the darker it
gets.
07 Common ctrl 63 31 Adjusts the common voltage (applied to LCD)
08 Signal center 63 18 Adjusts the DC level of composite video signals (applied to LCD). Set
the signal center to 7V.
09 Sub contrast 63 41 Adjusts the gain of R, G, B (applied to LCD).
10 R sub contrast 63 33 Adjusts the gain of R (applied to LCD).
11 B sub contrast 63 33 Adjusts the gain of B (applied to LCD).
5-5-4 LCD CONTROLLER (CXD2443Q) Adjustment
No. Item Range Initial value Description
00 LCD h pos 255 106 Determines the start location of horizontal indication by picture
element.
01 LCD v pos 15 3 Determines the start location of vertical indication (within 1H)
02 SH position 15 6 Determines the phase of the sample/hold pulse.
5-6 Samsung Electronics
Alignment and Adjustments
5-5-5 Lamp's Total Hours
No. Item Range Initial value Description
00 lamp total time 05999 Records total elapsed time (from the time where power is first applied).
Reset not possible
Records total elapsed time (from the point where power is first
applied). Reset (using the cancel key). The lamp time is displayed by
01 lamp time 05999 using the Display key. Reset must be done during the set shipment.
Reset must be done after lamp replacement.
5-5-6 Option
No. Item Range Initial value Description
00 Epg on/off off Electronic program guide
01 Av_link on/off on Av_link
02 Palplus on/off off -
03 27Mhz external on/off on 27Mhz external
04 16 : 9 wide on/off on 16 : 9 wide
05 Dolby prologic on/off off Dolby prologic
06 3d sound on/off on 3d sound
07 S-audio mute on/off off Scart audio mute
08 Blue screen on/off on Blue screen
09 UHF only on/off off UHF only
10 Vga on/off off Vga input
11 Atm one run on/off on Atm one run ("OFF" for France)
12 Size key on/off on Size key
13 Vert. peaking on/off on Vip option
Samsung Electronics 5-7
Alignment and Adjustments
5-6 Circuit Adjustments
5-6-1 LCD Control Board PLL Adjustment 5-6-4 Matrix G Output Signal Amplitude
Adjustment (Green Drive)
1. Input a color bar signal.
1. Input a 10-step signal (Color OFF).
2. Connect CNL06,RPD to an oscilloscope, and
check the waveforms. 2. Connect CNL07 (G output) to an oscilloscope,
(1 V/div, 20 u sec/div) and check the waveform.
(0.5 V/div, 10 u sec/div)
DC2.8V
3. Adjust the green drive so that the signal
RPD amplitude becomes 0.7Vp-p.
5-6- 5 Matrix B Output Signal Amplitude
Adjustment (Blue Drive)
5-6-2 Matrix IC (TDA4780) Sub Tint Adjustment
1. Input a 10-step signal (Color OFF).
1. Input a color bar signal.
2. Connect CNL07 (B output) to an oscilloscope,
2. Connect CNL07 (B output) to an oscilloscope, and check the waveform.
and check the waveform. (0.5 V/div, 10 u sec/div)
(0.5 V/div, 20 u sec/div)
3. Adjust the blue drive so that the signal ampli-
tude becomes 0.7Vp-p.
5-6-6 Main Brightness Adjustment
1. Input a 10-step signal (Color OFF).
5-6-3 Matrix R Output Signal Amplitude 2. Connect LCD CNL08(R1) input to an oscillo-
Adjustment (Red Drive) scope, and check the waveform.
(2 V/div, 10 u sec/div)
1. Input a 10-step signal (Color OFF).
3. Adjust the main brightness so that the Ref
2. Connect CNL07 (R output) to an oscilloscope, pulse is positioned on the center of signal.
and check the waveform.
(0.5 V/div, 10 u sec/div) Note : The change point (on gamma curve) is
determined by Ref.
3. Adjust the red drive so that the signal ampli-
tude becomes 0.7Vp-p.
4. Adjust the Sub-brightness of TDA4780 so that
the waveform (without sync) is seen as shown
in the figure below. REF Pulse
5-8 Samsung Electronics
Alignment and Adjustments
5-6-7 R Main Brightness & B Main Brightness 5-6-9 B Sub-brightness & B Contrast
Adjustments Adjustments
1. Input a 5-step signal (Color OFF). 1. Input a 5-step signal (Color OFF).
2. Connect CH1 to LCD G1 input and CH2 to 2. Connect CH1 to LCD G1 input and CH2 to
LCD R,B input. (1 V/div, 10 u sec/div) LCD B1 input. (1 V/div, 10 u sec/div)
3. Reverse the CH2 signal, and add CH1 and 3. Reverse the CH2 signal, and add CH1 and
CH2 in ADD mode. CH2 in ADD mode.
4. Adjust R,B main brightness for the waveform 4. Adjust B sub-contrast and B sub-brightness
shown below. waveforms, as shown below:
Note: The R,B main brightness adjustment should
be done with Gamma
Adjustment OFF (gamma ctrl1 = 63, gamma Contrast Adjustment
ctrl2 = 17).
Brightness Adjustment
Brightness Adjustment
5-6-10 Gamma Adjustment
5-6-8 R Sub-brightness & R Contrast
Adjustments 1. Input a 5-step signal (Color OFF).
1. Input a 5-step signal (Color OFF). 2. Connect LCD G1 input to an oscilloscope.
(2 V/div, 10 u sec/div)
2. Connect CH1 to LCD G1 input and CH2 to
LCD R1 input. (1 V/div, 10 u sec/div) 3. Adjust the gamma gain1, gain2 and the
gamma ctrl1, crtl2 for the waveform shown
3. Reverse the CH2 signal, and add CH1 and below.
CH2 in ADD mode.
4. Adjust R sub-contrast and R sub-brightness
waveforms, as shown below:
Contrast Adjustment
Brightness Adjustment
Samsung Electronics 5-9
Alignment and Adjustments
5-6-11 Sub-Contrast Adjustment 5-6-14 White Balance Adjustment
1. Input a 5-step signal (Color OFF). 1. Input a lion head pattern from a pattern
generator.
2. Connect LCD G1 input to an oscilloscope.
(2 V/div, 10 u sec/div) 2. Adjust the sub-brightness so that the white
cannot be saturated.
3. Adjust the sub-contrast so that the signal level
is 3V, as shown below: 3. Adjust R,B contrast for the high light of white
balance.
4. Adjust R,B sub-brightness when the middle
tone is not black and white,but colored.
Repeat adjustments 3 ~ 4 for optimum.
5. Adjust gamma crtl1 for adjusting the bright-
ness of the black side.
Center 7V
6. Adjust R,B gamma crtl1 while checking the
3V
tone of the black side so that any color is not
seen.
7. Repeat adjustments 2 ~ 6, if necessary.
5-6-12 Signal Center Adjustment
5-6-15 Center Convergence Adjustment
1. Input a 5-step signal (Color OFF).
1. Input a lion head pattern from a pattern
2. Connect LCD G1 input to an oscilloscope, and generator.
check the waveform.
(2 V/div, 10 u sec/div) 2. Adjust the LCD Horizontal/Vertical POS.
3. Set the signal center to 7V.
5-6-13 Common Voltage Adjustment
1. Connect LCD COMMON input to an
oscilloscope, and check the waveform.
(1 V/div, 10 u sec/div)
2. Set the common control to 6.8V.
5-10 Samsung Electronics
Alignment and Adjustments
5-7 LED Display Check
: OFF : ON : Blinking
No Status Stand By
Picture Lamp
Temp
1 Master Power ON (in the Stand-by Mode)
2 Normal operation
3 Lamp is warming up. or
The normal picture comes on after 25 seconds.
4 Air vent cover in the rear of the TV is not properly installed.
5 Inside temperature of the TV is over normal. Clean the air vent cover
in the rear of the TV. Turn the TV back on after 1 hour.
(see below "Temperature")
6 The lamp needs to be replaced.
x Temperature
Wen the inside temperature of the TV becomes too high, the TV set is automatically turned off.
You will observe the following.
1. "TEMP" LED is blinking for about 5 ~ 6 seconds.
2. The picture is turned to blue screen and "TEMPERATURE" character blinks for about 5 ~ 6 seconds.
3. The power is turned off and "TEMP" LED is blinking for about 20 seconds.
(This is not a TV set failure and normal operation)
Samsung Electronics 5-11