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Alignment and Adjustments
4. Alignment and Adjustments
4-1 General Alignment Instructions
1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync and focus. 2. Observe the picture for good black and white details. There should be objectionable color shading; if color shading is present, demagnetize, perform purity and convergence adjustments described below. 3. Use the specified test equipment or its equivalent. 4. Correct impedance matching is essential. 8. To protect against shock hazard, use an isolation transformer. 5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test results. 6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate. 7. Do not attempt to connect or disconnect any wires while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.
4-2 Automatic Degaussing
A degaussing coil is mounted around the picture tube, so that external degaussing after moving the TV should be unnecessary. But the receiver must be properly degaussed upon installation. The degaussing coil operates for about 1 second after the power is switched ON. If the set is moved or turned in a different direction, the power should be OFF for at least 10 minutes. If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to a distance of about 6 feet before turning power OFF. If color shading persists, perform the following Color purity and Convergence adjustments.
4-3 High voltage Check
CAUTION : There is no high voltage adjustment on this chassis. The B+ power supply should be +135 volts (with full color- bar input and normal picture level).
1. Connect a digital voltmeter to the second anode of the picture tube. 2. Turn on the TV. Set the Brightness and Contrast controls to minimum (zero beam current). 3. Adjust the Brightness and contrast controls to both extremes. Ensure that the high voltage does not exceed 32 KV under any conditions.
Samsung Electronics
4-1
Alignment and Adjustments
4-4 Dynamic Focus Adjustment
1. A dynamic focus adjustment should be done after replacing the CRT PCB, FBT or CRT. 2. Input a crosshatch pattern.
3. Enter " STANDARD " in video mode. 4. Turn the static focus VR fully clockwise (maximum). 5. Turn the dynamic focus VR fully counterclockwise (maximum). 6. Slowly turn the static focus VR counterclockwise. Adjust until the vertical line in the middle of the screen has maximum clarity. 7. Slowly turn the dynamic focus VR (clockwise) and adjust the 3rd horizontal line for maximum clarity. 8. Repeat 4-7, if necessary.
DYNAMIC FOCUS VR V
STATIC FOCUS VR H
SCREEN
4-5 SCREEN Adjustment
1. Input Toshiba Pattern 2. Enter "Service Mode".(Refer to "Service Mode") 3. Select "G2-Adjust". 4. Set the values as below. IBRM = 245 WDRV = 55 CDL = 255 COL = 200 5. Turn the SCREEN VR until "MRCR G B" and "MRWDG" are green and those value are about 100. (The incorrect SCREEN Voltage may result that "MRCR G B" and "MRWDG" should be red)
4-2
Samsung Electronics
Alignment and Adjustments
4-6 E2PROM (IC902) Replacement
1. When IC902 is replaced, all adjustment data revert to the initial values. So, all adjustment values when servicing should be readjusted. 2. After IC902 is replaced, connect the AC power supply cord. 3. Turn the power switch ON. 4. In stand-by, warm up the TV for at least 10 seconds. 5. Power on the TV.
4-7 White Balance Adjustment
s Equipment : Color-Analyzer (CA-100) s Input Signal : Pattern signal (Toshiba pattern) 1. Select STANDARD from the menu. 2. Input an 100% White pattern. 3. Enter the "Service Mode". (Refer to "4-8 Service Mode") 4. Warm up the TV set at least for 30 minutes. 5. Input a Toshiba pattern signal. 6. Enter the "Video Adjust1". - Adjust "Sub Contrast" so that Y (luminance) becomes 40 ft ± 3. - Use "Red Drive" and " Blue Drive" to adjust High-Light (x : 290, y : 300) - Adjust "Sub Bright" so that Y (luminance) becomes 1.3ft ± 0.3. - Use "Red Cutoff" and "Blue Cutoff" to adjust Low-Light (x : 290, y : 300). 7. Adjust CA-100 so that the final adjustment value can be fixed. 8. Use the Channel Up/Down (v/w) buttons to move the cursor on the adjustment modes. 9. Use the Volume +/- buttons to change the adjustment value.
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4-3
Alignment and Adjustments
4-8 Factory Adjustment
4-8-1 Service Mode
1. To enter the "Service Mode", Press the remote-control keys in this sequence : - If you do not have Factory remote-control
PICTURE OFF DISPLAY ( ) MENU MUTE PICTURE ON
- If you have Factory remote-control
PICTURE ON DISPLAY ( ) FACTORY
2. After the Service Mode is entered, the initial screen is as shown in the figure below.
*
These hexa * depends on digits are check sum value which the MICOM version. If check sum value is changed, the value of 2 E PROM Data newly initialed.
3. Use the Channel Up/Down buttons to move the cursor in the adjustment parameters. Note : - When CRT, CRT PCB, FBT, E PROM (sometimes MICOM) is replaced, the adjustment values should be controlled. - After the Service adjustment is completed, Do not select "Reset" in the service mode menu. (After above procedure is done, power is on initially and the "Plug and Play" will be operated.)
2
4-4
Samsung Electronics
Alignment and Adjustments
4-8-2 Deflection (Memory Data)
4-8-2(A) GEOMETRIC ADJUSTMENT VALUE
Fixed Value No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OSD V Shift V Amp V Slope V SC H EW H Trapizium H Parabola H Symmetry H Corner H Shift 4:3-Zoom Para 4:3-16:9 Para Wide-4:3 Para Wide-Zoom Para TTX Position D-TTX Posi Range 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 0 ~ 255 -20 ~ 20 -20 ~ 20 -20 ~ 20 -20 ~ 20 Initial Value 100 120 124 122 200 80 120 140 150 140 -7 3 0 0 0 0 Function Adjust Vertical Picture Position Adjust Vertical Picture Size Adjust Vertical Slope Correction Adjust Vertical S-Correction Adjust Horizontal Picture Size Adjust Horizontal Trapeziod Adjust Horizontal Parabola Wave Adjust Horizontal Symmetry Adjust Horizontal Corner Adjust Horizontal Position Adjust Horizontal Parabola in Zoom Mode Adjust Horizontal Parabola in 16:9 Mode Adjust Horizontal Parabola in 4:3 Mode Adjust Horizontal Parabola in Zoom Mode Adjust Horizontal OSD/TTX Position Adjust Horizontal OSD/TTX Position Wide CRT 4:3 CRT Not to be adjusted Not to be adjusted Remark
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4-5
Alignment and Adjustments
4-8-2(B) SCREEN CHANGE (I2C BUS GEOMETRIC ADJUSTMENT)
1
V Shift
6
V Amp
2
V Slope
7
V SC
3
H EW
8
H Trapizium
4
H Parabola
9
H Symmetry
5
H Corner
10
H Shift
4-6
Samsung Electronics
Alignment and Adjustments
4-8-2(C) VIDEO ADJUST 1
Fixed Value No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 OSD Red Cufoff Green Cutoff Blue Cutoff Red Drive Green Drive Blue Drive Sub Bright Sub Contrast Sub Color Sub Tint BCL Threshold BCL Gain BCL Time TTX Contrast YC Delay Range Initial Value 0 ~255 0 ~255 0 ~255 0 ~255 0 ~255 0 ~255 0 ~ 200 0 ~ 13 0 ~ 27 0 ~ 100 0 ~ 255 0 ~ 15 0 ~ 15 0 ~ 255 0~8 127 127 127 127 127 127 100 7 20 80 40 7 4 90 * Adjust OSD/TTX Contrast Refer to Table 1 Adjust Beam Control Limit Refer to Note 1 Not to be adjusted Adjust Red Cutoff Level Adjust Green Cutoff Level Adjust Blue Cutoff Level Adjust Red Output Gain Adjust Green Output Gain Adjust Blue Output Gain Adjust Brightness Level Adjust Contrast Level Adjust Color Level Adjust Tint Low Light High Light High Light Low Light Function Remark
Note 1. Beam Control Limit Characteristic
beam
MIN 1.8mA 1.6mA BCL THESHOLD BCL GAIN MAX
WDRGB
50
IRE
Table 1. YC Delay Adjustment Table YC Delay Value PAL Def. 2 BG 3 DK 6 I 6 L 8 Def. 4 BG 8 SECAM DK 8 I 8 L 5 NTSC Def. 3
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4-7
Alignment and Adjustments
4-8-2(D) VIDEO 2 ADJUST
No. 1 2 3 4 5 6 7 8 9 10 11 OSD B stretch-BTHR B stretch-BTLT B stretch-BAM Coring
1
Range 0 ~ 55 0 ~ 15 0 ~ 31 10 ~ 31 0 ~ 10 0 ~ 20 0 ~ 255 0 ~ 255 0 ~ 15
Initial Value 0 0 0 31 3 8 92 26 0 90 108 Black Stretch Threshold
Function
Remark
Black Stretch Tilt Position Black Stretch Amount Luma Peaking Filter Coring Noise Reduction off value Adjust "Melody" Volumn Level OSD/TTX RGB Bright OSD/TTX RGB Contrast Electronic High Tension Response Time Electronic High Tension Coefficient Vertical Set-Up Time
NR off Value Melody Volumn RGB Bright RGB Contrast EHT Time
EHT Compensation 0 ~ 255 2 VSU 96 ~ 111
1 Coring : The Value of Center Frequency for the active bandwidth. 2 VSU : Vertical Sync Delay Time for OSD/TTX jutter-free, or OSD bounding.
4-8-2(E) VIDEO 3 ADJUST
No. 1 2 3 4 5 6 7 OSD Peak Threshold Soft Limit Slope B Hard Limit Peak Video Ref Peak Video Gain Range Initial Value 0 ~ 255 0 ~ 15 0 ~ 255 0~4 0~5 185 4 160 1 3 20 20 Function White Peak Level Threshold Refer to Picture Below White Peak Level Threshold Reference White Peak Level Threshold Gain Auto Color Control Refer to Note Below Remark
ACC-REF(PAL/NTSC) 0 ~ 20 ACCR(SECAM) 0 ~ 39
Note 2. Soft Limit & Hard Limit Characteristics
Output 511
Part 1
Part 2
Slope 1 [0...15]
Hard limiter
0 2 4 6 8 10 12 14
Slope 2 [0...15]
400
300
200
0 2 4 6 8 10 12 14
Soft Limit Slope B
range=256...511
"Soft Limit" is that Limitting the peak white without feed-back, but "Peak Limit" is that with feed-back for white peak level
100 tilt 1 [0...511] 0 0 100 200 300 400 500 600 700 800 900 tilt 2 [0...511] Li 1023
4-8
Samsung Electronics
Alignment and Adjustments
4-8-2(E) VIDEO 3 ADJUST
Initial Value CW Off Select Video System Set the model without AV Key in front panel to "on"
No. 1 2 3 4 5 6 7 8 9 10 11 System
OSD
Function
Remark
AV by CH key Sound CRT AV Mode Speaker X-Ray TTX To P Tilt Control Auto FM Txt Language
A2/NICAM Depending on the sound IC (IC601) 4:3 2Scart Dome Spk Off Off On On West Europe Depending on the Model Depending on CRT size Depending on External Jack
Select OSD/TTX Language
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4-9
Alignment and Adjustments
4-9 MICOM
4-9-1 Pin Layout
Write Protect EEPROM SDA EEPROM SCL Bus-Stop Main SDA Main SCL Sound Reset Video Reset VDD 2.5V GND VDD 3.3V CVBS Input VDD 2.5V GND AFT Scart1 Ident Scart2 Ident Key 1 H-Sync V-Sync Key 3 Key 2 X-Ray Protect IR Input Stand-By LED Time LED
1 2 3 4 5 6 7 8 9 10 11 12 13 14
I/O I/O IO I/O I/O I/O I/O I/O
PWM I/O I/O
52 51 50 49 48 47 46 45
15 ADC 16 ADC 17 ADC 18 ADC 19 20 21 I/O 22 I/O 23 I/O 24 I/O 25 I/O 26 I/O
S D A 5 5 5 X
44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 I/O 27
Tilt N.C. Power Sound Mute N.C. N.C. PX. Y PX. Y VDD 3.3V GND VDD 2.5V CORE OSD-B OSD-G OSD-R VDD 2.5V GND X-TAL Out X-TAL In MICOM Reset N.C. N.C. VDD 3.3V GND N.C. Relay
4-10
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Alignment and Adjustments
4-9-2 Pin Assignment Specification
PIN NO FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 I/O I/O I/O I/O I/O I/O I/O I/O Vdd GND Vdd CVBS Vdd GND ADC ADC ADC ADC HS VS I/O I/O I/O I/O I/O I/O
ASSIGN Write Protect ROM SDA ROM SCL Bus Stop Main SDA Main SCL Sound Reset Video Reset VDD 2.5V
IN/OUT Out I/O I/O In I/O I/O Out Out
ACTIVE H/L Low
DESCRIPTION EEPROM Write Protection EEPROM Serial Data Line EEPROM Serial Clock Line
Low
Disable Micom IIC Peripheral IC Serial Data Line
Low Low
Peripheral IC Serial Clock Line MSP IC Initial Control VDP IC Initial Control
VDD 3.3V CVBS Input VDD 2.5V In TTX CVBS Input Analog B+ Analog Ground AFT SC1-ID SC2-ID Key1 H-Sync V-Sync Key3 Key2 X-Ray IR-In STD-LED TIM-LED In In In In In In In In In In Out Out Auto Fine Tuning Control Scart1 Ident Scart2 Ident Key1 Input Horizontal Sync Input Vertical Sync Input Key3 Input Key2 Input X-Ray Protection Remocon Signal Input LED Drive Output(Red) LED Drive Output(Green)
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4-11
Alignment and Adjustments
4-9-2 Pin Assignment Specification (Continued)
PIN NO FUNCTION 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 I/O N.C. GND Vdd N.C. N.C. Reset X-In X-Out GND Vdd R G B COR Vdd GND Vdd I/O I/O N.C. Not Used (Programmed Gound Level) N.C. I/O I/O N.C. I/O Tilt Out PWM S-Mute Power Out Out High Low Sound Amp Mute Picture On/Off Control Not Used (Programmed Gound Level) Tilt Control Output VDD 3.3V PX.Y PX.Y In When The Caption Function Adopted, Used. Out VDD 2.5V OSD-R OSD-G OSD-B CORE VDD 2.5V Out Out Out Out Reset X-TAL In X-TAL Out In In Out Low 6MHz 6MHz VDD 3.3V ASSIGN Relay
IN/OUT Out
ACTIVE H/L Low
DESCRIPTION Activate Degausssing Coil Not Used (Programmed Gound Level) Analog Ground Not Used (Programmed Gound Level) Not Used (Programmed Gound Level) Micom Hardware Reset Crystal Oscillation Input Crystal Oscillation Output Analog Ground Analog B+ OSD/TTX Output (Red) OSD/TTX Output (Green) OSD/TTX Output (Blue) Fast Blank/Half Contrast Output
4-12
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