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CTV-221SR IC,LA 76814
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Service Adjustments
Please notice the following before alignment and equipment
1. Don't short any two soldering points, which should not be shorted and don't touch any components,
which should not be touched.
2. Please pull out plug before equipment.
3. For safety reasons, all components equipped or replaced should be identical with BOM.
4. Must be warm up for 30 minutes or more and degauss CRT thoroughly with demagnetizer before
alignment.
The data of EEPROM must be stored before the adjustment for main chassis. And EEPROM must be
corrected by the correct file "3Y03_ROM_CORRECT.hex" to avoid signal of CH6 weaken. R.bias,
G.bias, B.bias, R.drv, G.drv, B.drv should be set to proper values. Sub_bright is set to 63 usually.
Tools and equipments for adjustment
1. small "-" screwdriver
2. screwdriver without inductance
3. Pattern Generator
4. DC Regulated power supply
5. Digital Voltmeter
6. Sweep Signal Generator
7. 20MHz 2-channel Oscilloscope
Signal condition
PICTURE SOUND
ITEMS LOGO PATTERN SYSTEM REMARK
CARRIER MODE
MONO
1 CH14 471.25 MHZ COLOR BAR NTSC/M
1KHz
BTSC
2 CH3 61.25 MHz GRAY SCALE NTSC/M
0.3k,3kHz
MONO
3 CH8 181.25 MHz MONOSCOPE NTSC/M
MUSIC
MONO
4 CH12 205.25 MHz CROSS HATCH NTSC/M
1KHz
Adjust for main chassis
PIF Adjustment (45.75MHz)
a. Tuner AGC connects to GND. Pattern Generator outputs 45.75MHz I.F. signal (70dbµV)and connects to SAW filter
output terminal through a capacitor .
b. Connect Digital voltmeter across C227. DC Regulated power supply positive terminal output +14V to C617.
c. Adjust L203 coil to obtain 3.6V Digital voltage meter reading.
NOTE: To cancel this adjustment , L203 can be adjusted before inserted to the chassis with a special equipment.
-12-
Service Adjustments
B+ adjustment
a. Disconnect horizontal load. Connect a bulb (100 W) AC 250V across C321.
b. Add 220V AC 50HZ to CN601 and switch on power switch.
c. Test the voltage with digital voltage meter between C321 two terminals.
d. Adjust VR601 to obtain +110V¡À0.5V.
AGC alignment
a. Receive 60dB RF signal. Connect Digital voltmeter positive terminal to tuner AGC terminal and negative terminal
to GND.
b. Press "MENU" key, then press "Q.VIEW" key, "MUTE" key in turn on telecontroller. TV SET will go to factory mode.
Press "TIMER" key to go to the next factory menu. Go to MENU5 status by this means. Press "MENU" key to exit
factory mode.
c. Select RF.AGC by pressing "CH+" and "CH-"keys. Adjust "VOL+" and "VOL-" keys to obtain 4V Digital voltage
meter reading.
COMPLETE MACHINE GENERAL ADJUSTMENT
Go to factory mode according to 4-2-2 before warm up line
Focus Adjustment
a. Receive monoscope pattern.
b. Set TV to work in dynamic status.
c. Adjust the focus knob of FBT to get the clearest picture.
Screen Voltage Adjustment
a. Check the R.bias, G.bias, B.bias, R.drv, G.drv, B.drv and sub_bright. Go to factory mode "MENU2" status
according to 4-2-2. Usually G.bias should be same as the value of auto white balance equipment. And
SUB_BRIGHT is 63.
b. Set Cross_BW `3". Then the picture will be a white "+". Cross_BW is in factory menu 3.
c. In menu 5, select SUBB.ADJ and set it to "1". Adjust the screen knob of FBT to get a faintness "+".
d. Restore the SUBB.ADJ to "0" and CROSS.BW to "0".
White Balance Adjustment (Applied in factory)
a. Set TV AV status in custom mode(Or other mode need for the adjustment) . Receive black white pattern.
b. Insert six-row-wire into CN002.Press adjustment keys, and then go to automatic white balance adjustment.
c. PIN DISCRIPTIONN OF CN002:
1£ºSDA£¬ 2£ºSCL£¬ 3£ºGND£¬ 4£ºGND£¬ 5£ºSCL£¬ 6£ºSDA¡£
d. After adjusting well, pull out six-row-wire.
-13-
Ver tical size and pincushion adjustment
Service Adjustments
White balance adjustment (Applied when servicing)
a. Set TV AV status and receive GREY SCAL.
b. The one sampling tube of CRT color analyzer (CA-100) covers on GREY signal and
the another covers on white signal.
c. Go to factory mode "MENU2". Obtain GREY signal X=281 and y=311 by adjusting R-CUT and B-cut. Obtain white
signal X=281 and y=311 by adjusting R-DRV and B-DRV. Obtain both X=281 and Y=311 by adjusting the two
status repeatedly.
Sub_bright adjustment
Receive the gray scale . Get into the menu5 of factory mode. Set SUBB.ADJ to "1". Then adjust the SUB..BRI
option to get a scale to be seen a little brightness(Only two rows can be seen).
Vertical Size and PinCushion Adjustment
a. Receive monoscope pattern. Set TV standard status. Adjust V.size to obtain picture's vertical redisplay ratio more
than 90% in factory mode "MENU1".
b. Receive cross hatch pattern. Set TV standard status. Adjust V.LINE and V.SC to obtain picture's vertical pin
cushion a good status in factory mode "MENU1".
c. Receive cross hatch pattern. Set TV standard status. In factory mode "MENU1" adjust V.POS to obtain picture's
vertical center at the center of CRT screen.
Horizontal Center Adjustment and horizontal position of OSD adjustment
a. Receive monoscope PATTERN. Set TV standard status. Adjust H.PHASE in menu 1 to obtain horizontal center
at the center of CRT screen.
b. Adjust the "OSD.HPOS" to get right display position.
SUB.TINT ADJUSTMENT
Receive the color bar signal of NTSC system. Set the picture mode at normal mode. Adjust the `SUB.TINT' option
in menu5 at sevice mode to get the right hue .
MTS ADJUSTMENT
Receive the RF CROSS-TALK signals , but FM with BTSC .Enter into the factory mode. Set ADJ.FREQ to 1 in
"9852 AUTO.ADJ". Wait 1 second . Quit factory menu after "ADJUSTING " change to "0".
-14-
Ver tical size and pincushion adjustment
Service Adjustments
COLOR PURITY ADJUSTMENT
a. Before color purity adjustment, Warm up the TV set over 15 minutes and fully degauss.
b. Receive pure white signal in AV status and set the TV receiver dynamic.
c. Go to factory mode "MENU2". After write down the values of R-BIAS and B-BIAS, set the values of R-BIAS and
B-BIAS zero.
d. Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color purity magnetic loop.
e. Adjust color purity magnetic loop to make the green area at the center of CRT screen.
f. Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is obtained.
Tighten the clamp screw of the deflection yoke.
g. Restore the values of R-BIAS, G-BIAS and B-BIAS.
CONVERGENCE ADJUSTMENT
a. Receive a dotted pattern. Set the TV receiver dynamic.
b. Loose the convergence magnet clamper and align red with blue dots at the center of the screen by rotating (R, B)
static convergence magnets.
c. Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static convergence magnet.
d. Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the good overall
convergence. Fix them after the good overall convergence got.
e. Fix the convergence magnets by turning the clamper.
f. If purity error is found, follow "PURITY ADJUSTMENT" instructions.
Purity Magnet
RB-G RB
Magnet Clamper
Static Magnet
-15-
Ver tical size and pincushion adjustment
Service Adjustments
APPENDIX
FACTORY MENU DISCRIPTION
MENU1 VALUE DISCRIPTION
1 V.SIZE 101 Align vertical amplitude
2 V.POS 32 Align vertical DC bias
3 V.LINE 16 Align vertical linearity
4 V.SC 0 Align vertical S-correction
5 H.PHASE 8 Align sync to flyback phase
6 H.BLK.RL 4 H-blanking Control(Width /Phase)
7 H.FREQ 22 Align ES Sample horizontal frequency
MENU2
1 V.KILL 0 Disable vertical output
2 R.B 138 Align Red out DC level
3 G.B 182 Align Green out DC level
4 B.B 148 Align Blue out DC level
5 R.D 67 Align Red out AC level
6 G.D 8 Align Green out AC level
7 B.D 45 Align Blue out AC level
MENU3
1 RG.GAM 1 Disable R/G gamma correction (0/ON; 1/OFF)
2 B.GAM 3 Select and Disable B gamma correction(0~2/ON;3/OFF)
3 R.B.ANG 1 Adjust the demodulation angle of R-Y and B-Y
4 AT.FLESH 0
5 GRAY.MODE 0 Select Test mode (0/White; 1/Gray)
6 CROSS.BW 0 Service Test mode (0/TV; 1/Black; 2/White; 3/Crosshatch)
7 AFC.GAIN 0 Select Horiz. 1st loop gain & H-sync gate on/off(0/auto;1/enforce)
8 H.BLK.SW 0 H BLK R&L selection(0/right side blanking can be adjusted;1/left)
MENU4
1 FILT.SYS 1 Select Y/C filter mode(0,2/3.58 unsymm.; 1,3/3.58 sym.; 4~7/no filt)
2 CORING 1 Enable Luminance coring( 0/Off; 1/ON)
3 OSD.CONT 1
4 OSD.HPOS 30 Align the horizontal position of OSD
5 BLK.STR.D 0 Disable black stretch
6 BRIABL.T 0 Align brightness ABL threshold
MENU5
1 RF.AGC 31 Align RF AGC threshold
-16-
Ver tical size and pincushion adjustment
Service Adjustments
OPTION
1 2 AV.CH 3 Select AV numbers(0/ No AV;1/1 AV; 2,3/2AV)
2 SRH.SPEED 0 Select auto search speed(0/fastest, 7/lowest)
3 TDA9852 1 Disable 9852(0/disable; 1/able)
4 TUN.AS.V 1 Select the Tuner address(0/Tuner pin3 to ground;1/pin3 not used)
9852 AUTO.ADJ
1 ADJ.FREQ 0 Disable auto adjusting(0/disable; 1/get into autoadjust mode)
2 ADJUSTING 0
3 FM.LVL 16
4 76075.VOL 0
5 L3-L0 0 input level adjust
6 TC2-TC0 0 timing current alignment data
7 A14-A10 0 stereo alignment data for wideband expander
8 A24-A20 0 stereo alignment data for spectral expander
TDA1
1 VOL.RIGHT 125 volume control right
2 VOL.LEFT 125 volume control left
3 GMU 0 mute control for all outputs (general mute )
auto volume control (with 0.1Vrms-1.1Vrms input to get constant output
4 AVLON 0
0.2Vrms)
5 LOFF 0 switch loudness on/off
6 CCD 0
7 SC2-SC0 2 selection between line in and line out
8 SAP.ID 0
TDA2
1 STERO.ID 1
2 TZCM 0 zero cross mode in volume operation
3 LMU 0 mute control for line out
4 EF2-EF0 0 selection between mono, stereo linear, spatial stereo and pseudo mode
5 L3-L0 0 input level adjust
6 A14-A10 0 stereo alignment data for wideband expander
7 A24-A20 0 stereo alignment data for spectral expander
8 STS 0 stereo level switch
-17-
Ver tical size and pincushion adjustment
Service Adjustments
TDA3
1 ADJ 0 stereo adjust on/off
2 AT1-AT2 0 attack time at AVL
3 TC2-TC0 0 timing current alignment data
4 WR.ERR 0
5 RD ERR 0
6 MANU ADJ 0
7 STEREO 0 mode selection for line out
8 SAP 0 mode selection for line out
White Balance address
White Balance address
LA76814 ADDRESS
Data Name E2PROM Address
#1011 1010B
bright 12H #0001 0100B
contrast 11H #0001 0101B
color 10H #1011 1010B
Sub-bright 24H #0001 0011B
R.B 1EH #0000 1101B
G.B 1FH #0000 1110B
B.B 20H #0000 1111B
R.D 21H #0001 0000B
G.D 22H #0001 0000B
B.D 23H #0001 0010B
-18-
Purity and Convergence Adjustment
COLOR PURITY ADJUSTMENT
(1) Before color purity adjustment,warm up the TV set over 15 minutes and fully degauss.
(2) Receive pure white signal in AV status and set the TV receiver dynamic.
(3) Go to factory mod MENU2. After write down the values of R-BIAS and B-BIAS, set the values of R-
BIAS and B-BIAS zero.
(4) Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color purity
Magnetic loop.
(5) Adjust color purity magnetic loop to make the green area at the center of CRT screen.
(6) Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is
Obtained. Tighten the clamp screw of the deflection yoke.
(7) Restore the values of R-BIAS,G-BIAS AND B-BIAS.
CONVERGENCE ADJUSTMENT
(1) Receive a dotted pattern. Set the TV receiver dynamic.
(2) Loose the convergence magnet clamperrrrr and align red with blu dots at the center of the screen by
rotating(R,B) static convergence magnets.
(3) Align Red/Blue with green dots at the center of the screen by rotating(RB-G) static convergence
magnet.
(4) Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the
good
Purity Magnet
RB-G RB
Magnet Clamper
Static Magnet
-19-
Control Location
1. Remote Sensor
2. Power Indicator
3. Main Switch
4. Speakers
5. Program Down & Up Button
6. Volume Down & Up Button
7. Menu Button
8. AV/TV Button
9. Front AV In (Option)
10. Audio/Video - In/Out Jack
11. AC Power Cord
12. Terminal Antenna (75 Ohm)
4 9 5 6 7 8 2 1 3 4
(STEREO)
(MONO)
11 10 12
-20-
Input and Output Terminals
VIDEO AND AUDIO INPUT/OUTPUT TERMINALS
1. Video / Audio input for playback for VCR.
2. Video / Audio output for TV monitor output.
*Please keep AC cord unplugged when connecting TV system.
(STEREO)
AV-OUT AV-IN
L L
VIDEO AUDIO VIDEO AUDIO
R R
(MONO)
OUT IN
VIDEO AUDIO VIDEO AUDIO
NOTE:
This is a mono CTV even though there are R & L audio input & output jack. These
audio R/L input terminals are parallel connected inside and make mixed monaural
sound output .There are same monaural audio output come from R/L output terminals.
-21-
Operation Instructions
Turn the TV set on, then power indicator will light up. After a few seconds , the currently program number is
displayed on the top right -hand corner of the screen.
MENU BUTTON
1.Press this button to select menu. VIDEO, TIME, and SETUP menu can be selected cyclically.
Video Menu Audio Menu Time Menu Setup Menu Exit Menu
(Option)
2.After enters each menu, you can select the desired adjusting item by the PROG.+/- buttons, and adjust the
item by the VOL. +/- buttons.
*When you select a item, symbols¡° / ¡±will display both sides of the item.
Video menu
1.Enter the video menu , you can select the picture quality instantly among four
Video Custom
preset modes and one user-set mode.
Contrast 16 (User-set mode)
Audio Bright 16 Custom Standard Sports Movies Mild
Sharpness 16
Time Color 16
Tint -15
Setup
*You can adjust CONTRAST ,BRIGHT , SHARPNESS , COLOR and TINT items
by pressing the VOL. +/- buttons . The adjusted level is stored in Custom mode.
Audio menu(option)
Video 1.ST:
Press the VOL.+/-buttons can select the stereo mode , the order shown below:
Audio ST Mono
SAP On Mono Spatial Linear Psuedo
Balance 00
Time
Setup
2.SAP:
You can adjust the SAP ON to SAP OFF by the VOL+/-buttons ,.
You can use the Second Audio Program when you select the SAP ON .
3.BALANCE:
Press the VOL+/-buttons can adjust the left or right volume balance .
* The MTS/SAP function is only an option for some models.
Time menu
1.CLOCK:
Video Press the VOL.- button to set hour, and the VOL.+ button set minute .
Clock --:--
Audio Timer Off
TV On --:-- 2.TIMER£º
Time TV Off --:--
When you select the "Timer ON" mode, you can set the time of TV ON or TV
Setup OFF.
*TV On: The TV will automatically turn on at the preset time.
TV Off: The TV will automatically turn off at the preset time.
-22-
Operation Instructions
Setup menu
1.After enters the setup menu, you press the PROG+/-buttons to select
Video PRESET MENU, CCD MENU and V-CHIP MENU.
Audio
Preset 2.Select the Language item by the PROG+/-buttons, and press the VOL.+/-
Time Captain
V-Chip
buttons to select the desired language . The screen menu is automatically
Setup Language displayed in that language.
The order shown below:
English Espanol Portugues
PRESET MENU , CCD MENU AND V-CHIP MENU
PRESET MENU
1.SYSTEM
Preset you can switch two signals :CABLE and ANTENNA .
System Antenna
2. CHANNEL
Channel 03
Select the cable signal ,there are 01~125 channels
Skip Off
Auto Search
Select the antenna signal , there are 02~69 channels .
Fine Tune
3.SKIP
Select "Skip ON" by VOL.+/- Buttons to skip unnecessary program
number.
4.AUTO SEARCH
Press VOL.+/-buttons to start auto searching.
5.FINE TUNE
In areas of inferior broadcast conditions where adjustment is necessary for
CCD MENU
1.CAPTION
ClosedCaption Set the caption OFF or ON .
Caption Off 2.MODE
Mode Capt. Select the caption mode or teletext mode .
Channel 1 3.CHANNEL
Field 1
Select channel 1 or channel 2 .
4.FIELD
Select field 1 or field 2 .
V-CHIP MENU
V-Chip 9999 ¡± call up V-Chip, MPAA and TVPG item.
Input the password¡° to
Input Pwd
V-Chip 1.V-CHIP
V-Chip On Set the V-Chip OFF or ON .
MPAA PG
TVPG TV-14
2.MPAA movie rating
Content-V B Select the type of program
Content-S B
Content-L B
3.TVPG(TV Parental Guidelines)
Content-D B Parents can guide their children watching some programmes by the item.
-23-
Mechanical Disassemblies
CABINET BACK REMOVAL CHASSIS REMOVAL
1. Refer to Figure 1,remove 9 screws. 1. Remove cabinet back.
2. Pull off cabinet back and remove. 2. Discharge the picture tube anode(2nd anode lead) to the
dag coating (picture tube grounding lead).
3. Disconnect Degaussing coil socket(KE),Picture tube socket,
Deflection yoke connector (KDY), Speaker connectors(KL
and KR), and 2nd anode lead.
4. Remove chassis completely by sliding it straight back.
PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke
or magnet assembly on the picture tube
Neck. Care must be taken to keep these
assemblies intact, unless picture tube is
being replaced. Discharge the picture tube
to the coating before handing the Tube.
1. Remove chassis, referring to Chassis Removal instructions.
2. Place cabinet front face down on the soft surface.
3. Remove the screw on each corner of the picture tube and
GENTLY lift the picture tube out of the cabinet.
4. Install a replacement picture tube in reverse order.
Properly install the degaussing coil and picture tube
grounding lead on the picture tube. See Figure 2.
Note: If the Picture Tube is being replaced, mount the
Degaussing Coil on the picture tube. See following..
DEGAUSSING
COIL
DEGAUSSING
COIL HOLDER
PICTURE TUBE
GROUNDING LEAD
DEGAUSSING To CRT Unit
COIL SOCKET ground
-24-
Cabinet Parts List
1 6 2 7 4 3 5 1 10
8 9
11
12
Key No. Part No. Description
1 SK140121NZM001(2) SPEAKER GRILLE(L&R)-SILVER BLUE #Sb001 (PVC)
2 SK100121NZM002 FRONT CABINET-METAL SILVER GREY #MSG001 W/AV (O-R-L-V)
3 SK100721NZM002 FRONT LENS (REMOTE CONTROL WINDOW)
4 SK100721NZM002 FRONT LENS (LED WINDOW)
5 Sk190100821210 POWER KNOB SPRING - DIA.0.6SPRING WIRE
6 SK100425TM0002 SIDE AV JACK BRACKET-DARK GREY #DG001(ABS)
7 SK100821NZM001 CONTROL KEY KNOB-ELECTROPLATING SILVER(ABS)
8 SK060121NZM001 BACK LABEL " SKYWORTH " OVERSEAS ENG
9 SK100221NX0001 BACK CABINET-DARK GREY #DG001
10 SK1015HS080002 BOTTOM CABINET - NORMAL GREY #NG001(ABS)
11 SK1016HS080003 BATTERY DOOR-NORMAL GREY #NG001(ABS)
12 SK1014HS080012 TOP CABINET - NORMAL GREY #NG001(ABS)
,, ,,
,, ,,
-25-
AR IN 9V(2)
R114 AR-OUT
RFAGC
R407
ADD
SDA
VCC
VCC
220
SCL
2.2K
NC
IF1
NC
IF2
9V(2)
33V
R408
2.2U/50V
R409 12/1W
C419
2.2K C418
R108 C114 R109 L102
TUNER 5.6K 0.01U 270 0.82UH X401 0.22U/M C415
220U/16V IC402
0.0082UF
503F58
2.2U/50V C426
C107 R105 ZD401
R103 0.01U
R410 C442 LA4285
4.7U/50V
4.7U/50V
0 20K 8V2
10U/16V
2.2U/50V
1
2
3
4
5
6
7
8
9
10
11
0.47U/M
120K
0.015UF
0.015UF
100U/16V
C109
GND
GND
0.01U
OUT
VCC
VOL
EXT
0.01U
INT
SW
C427
NF