Haier DTA-1518 User manual

SERVICE MANUAL
Colour Television
Haier model:
DTA-1518
Customer model:
TV/DVD-1533FL
FEATURES
zDVD-TV 15” COMBO
zAUTO TUNE/250 CHANNES
zDVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3 COMPATIBLE
zFORMATO DE VIDEO 4:3PS、4:3LB
zDOLBY AC-3 DECODE
zPANATAL LOCK
CAUTION
READ THIS MANUAL CAREFULLY TO
DIAGNOSE TROUBLE CORRECTLY BEFORE
OFFERINGSERVICE.

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2
CONTENTS
1. Safety precautions……………………………………………………………..……………3
2. TV block diagram……………………………………………………………………..…….4
3. Replacement of memory IC………………………………………………………….……5
4. Service adjustment……………………………………………………………..…………...5
5. ICs functional description…………………………………………………………………8
6. Test point waveform………………………………………………………………………10
7. All ICs voltages……………………………..……………………………………………….10
8. Purity / convergence adjustment………………………………………………………12
9. DVD maintenance…………………………………………………………………………13
10 Circuit diagram ……………………………………………………………………………16

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3
1. SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many
circuits and components especially for safety purposes. For
continued protection, no changes should be made to the
original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to those
used in the original circuits. Service should be performed by
qualified personnel only.
2. Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void the
manufacturer’s warranty and will further relieve the
manufacturer of responsibility for personal injury or property
damage resulting therefrom.
3. Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics
are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by using
replacement components rated for higher voltage, wattage,
etc. Replacement parts which have these special safety
characteristics are identified in the parts list of Service
manual. Electrical components having such features are
identified by shading on the schematics and by ( ！) on
the parts list in Service manual. The use of a substitute
replacement which does not have the same safety
characteristics as the recommended replacement part
shown in the parts list of Service manual may cause shock,
fire, or other hazards
4. Don’t short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing. Some model’s power circuit is
partly different in the GND. The difference of the GND is
shown by the LIVE: ( ) side GND, ISOLATED
(NEUTRAL): ( ) side GND and EARTH: ( ) side GND.
Don’t short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure with a measuring apparatus (oscilloscope etc.) the
LIVE side GND and ISOLATED (NEUTRAL) side GND or
EARTH side GND at the same time. If above note will not be
kept, a fuse or any parts will be broken.
5. If any repair has been made to the chassis, it is
recommended that the B1 setting should be checked or
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).
6. The high voltage applied to the picture tube must conform to
that specified in Service manual. Excessive high voltage can
cause an increase in X-Ray emission, arcing and possible
component damage, therefore operation under excessive
high voltage conditions should be kept to a minimum, or
should be prevented. If severe arcing occurs, remove the AC
power immediately and determine the cause by visual
inspection (incorrect installation, cracked or melted high
voltage harness, poor soldering, etc.). To maintain the proper
minimum level of soft X-Ray emission, components in the
high voltage circuitry including the picture tube must be the
exact replacements or alternatives approved by the
manufacturer of the complete product.
7. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10kΩ2W
resistor to the anode button.
8. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer’s replacement components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
terminals, video/audio input and output terminals, Control
knobs, metal cabinet, screw heads, earphone jack, control
shafts, etc.) to be sure the product is safe to operate without
danger of electrical shock.
10. The surface of the TV screen is coated with a thin film which
can easily be damaged. Be very careful with it when handle
the TV. Should the TV screen become soiled, wipe it with a
soft dry cloth. Never rub it forcefully. Never use any cleaner
or detergent on it.
(1) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second.
(…Withstand a voltage of 1100V AC (r.m.s.) to an appliance
rated up to 120V, and 3000V AC (r.m.s.) to an appliance
rated 200V or more, for a period of one second.)
This method of test requires test equipment not generally
found in the service trade.
(2) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
line isolation transformers during this check). Using a
“Leakage Current Tester”, measure the leakage current from
each exposed metal part of the cabinet, particularly any
exposed metal part having a return path to the chassis, to a
known good earth ground (water pipe, etc.). Any leakage
current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
●Alternate Check Method
Plug the AC line cord directly into the AC outlet ( do not use
a line isolation transformer during this check.). Use an AC
voltmeter having 1000 ohms per volt or more sensitivity in
the following manner. Connect a 1500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an
exposed metal part and a known good earth ground (water
pipe, etc.). Measure the AC voltage across the resistor with
the AC voltmeter. Move the resistor connection to each
exposed metal part, particularly any exposed metal part
having a return path to the chassis, and measure the AC
voltage across the resistor. Now, reverse the plug in the AC
outlet and repeat each measurement. Any voltage measured
must not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.).
This corresponds to 0.2mA AC (r.m.s.)

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4
2. Block diagram TDA9351PS/N2 series with mono intercarrier sound demodulator

5
3. REPLACEMENT OF MEMORY IC
1. MEMORY IC.
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection
circuits.
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC
Be sure to use memory IC written with the initial data values.
(3) Power On
Plug the power cord into the AC outlet and switch the power on.
(4) Check and set SYSTEM default value:
1) Press “MUNE” x3+1752buttons in sequence to enter into factory status.
2) If the memory IC haven’t been written with the initial data, press [P+] / [P-] to select item INIT and press
[V+] / [V-] to start initialize memory IC.
3) Check the setting value of the SYSTEM default value of Table below. If the value is different, select
items by [P+] / [P-] keys and set value by [V+] / [V-] keys.
4) Press “TV/AV” button to return to the normal screen.
4. SERVICE ADJUSTMENT
Specific operation: use remote controller
Press “MENU” x3+1752” buttons in sequence to enter into factory mode.
Press [P+] / [P-] to select items and press [V+] / [V-] key, to make data adjustment of corresponding factory
menus.
Press “AV/TV” key to exit factory mode.
Focus adjustment
1. Receive a crosshatch signal.
2. While watching the screen, adjust the FOCUS VR on the FBT to make the vertical and horizontal lines as
fine and sharp as possible.
Geometrical adjustment
Receive PAL standard complete pattern signal.
Adjustment steps：
a) Adjust VSL, to the centre horizontal line just appears from half bottom shadow.
b) Adjust VAM, to get 92% of vertical picture contents would be displayed on CRT.
c) Adjust VSH, the centre horizontal line corresponds to CRT vertical centre.
d) Adjust SCL, to the linearity of P card field is in proper condition.
e) Adjust HSH, to get the picture horizontal centre correspond to CRT horizontal centre.
Receive NTSC signal and repeat above adjustment.
AGC Adjustment
Receive 60dBµ (1mV) VH colour bar pattern signal.
Select TOP item.
Adjust value, to noise reduce gradually and just disappeared point.
CRT cut off and white balance adjustment
a) CRT cut off adjustment
1. Select item VG2B, then adjust value to 32.
2. PRESS “0” key, when the screen shows”VG2” adjust the SCREEN control on Fly back transformer to
make the screen show alternating flashing characters of “INSIDE HIGH INSIDE LOW”.
b) White balance adjustment
1. Receive a Black and White pattern.
2. Adjust WRP, WRG, WRB items to get colour temperature 9300K ±3 JND.

6
Adjustable Items
Direct access key Items Preset Remark
“1” 5/6HSH 19/27 A HORIZONTAL SHIIFT
“1” 5/6PAR 31/31 A HORIZONTAL
PARALLELOGRA
M
“1” 5/6BOW 35/31 A HORIZONTAL
BOW（PAL）
“1” 5/6EWW 33/34 A EW WIDTH
（NTSC）
“1” 5/6EWP 19/19 A EW PARABOLA /
WIDTH（NTSC）
“1” 5/6UCR 33/34 A EW UPPER
CORNER
PARABOLA（PAL）
“1” 5/6LCR 18/10 A EW LOWER
CORNER
PARABOLA(PAL)
“1” 5/6EWT 43/44 A VERTICAL EW
TRAPEZIUM
（PAL）
“2” 5/6VAM 10/11 Vertical amplitude
“2” 5/6VSH 22/23 A Vertical Shift
“2” 5/6VSL 31/30 A Vertical slope
“2” 5/6RGH 38/38 A RGB level center
“2” 5/6VOF 63/31 A OSD Vertical Offset
“2” HOF 36 A OSDHorizontalOffset
“2” ZOOM 32 A 16：9 scene extent
“2” VOL0 6 A MIN volume
“2” VOL16 16 A SET VOLUME 16
“2” VOL32 32 ASET VOLUME 32
“2” V63 63 A MAX volume
“3” WPR 31 A White Point R
WPG 31 A White Point G
WPB 31 A White Point B
RED 32 A Black level offset R
RGN 32 A Black level offset G
YDFP 8 A Y-D elay for PA L
TTBR 10 A TELETEXT brightness
ODBR 10 A OSD brightness
MDEL 30 A Boot-strap time-lapse
MUTE
INIC 16 A EEPROM
FILT 2 A TDA9874initialization
NGAN A NICAM frequency out
pressure
NMNG A DTA-9874 M frequency
out pressure
FGAN A DTA-9874FMfrequency
out pressure
DVDB 240 A DVD black electrify
time
CORI A CORING enactment
THDO 4 A TELETEXT cathode
ray tubes
AGC 27 A IF AGC speed
AGCL 27 A SCEAM L IF AGC
speed

7
FLRE A
“4” VOL 63 A Volume
IFFS 2
Vision IF
HDOL 2 A Cathode drive level
SPD 1 A
VG2B 42 A VG2 Brightness
BBRI 70 A Soft Brightness
WBRI 50 A Whirt Brightness
WCON 50 A WWhirt contrast
WCOL 50 A Whirt color
T1 32 A DVD START
DELAY TIME
T2 67 A DVD TRIGGER
TIME
T3 63 A DVD OFF
DELAY TIME
PWL 24 A peak value whirt
confine
“5” CONO 4 A Enactment contrast 0
BRI0 4 A Listen Brightness
COL0 3 A Listen Color
SHP0 0 A Listen Sharpness
CO32 70 A Contrast 50
BR32 40 A Brightness 50
CL32
240 ASaturation 0
SH32 60 A Definition 50
CONF 100 A Contrast 100
BRIF 100 A Brightness 100
SHPF 100 A Listen Sharpness
RGBL 8 A boot-strap wait for time
ONMT 1F A boot-strap black time
“6” LCOL 3 A factory standard color
SIZE 3 A factory standard size
ICON 5 A Soft CONtrast
ITEM 0 A MENUcharacter diploid
highness
TXMT 40 A TELETEXT X 位置
5TYM 38 A TELETEXT Y 位置
NOTE: THE ITEMS WITH REMARK “A” IS ADJUSTABLE DATA.
Optional data
1. OP1
Bit Function Description Preset Remark
Bit 0 AV2 1=Enable 1 EA
Bit 1 AV3 1=Enable 0 EA
Bit 2 YPRPB 1=Enable 0 EA
Bit 3 SVHS 1=Enable 0 EA
Bit 4 DVD 1=Enable 1 EA
Bit 5 YUV 1=Enable 0 EA
Bit 6 VG2_MODE 1=Enable(0=BACKCURRENT DETECT 1=水平亮线 0 EA
Bit 7 BAND 1=Enable 0 EA
2. OP2
Bit Function Description Preset Remark
Bit 0 AVL 1=Enable 0 EA
Bit 1 AUTO_SOUND 1=Enable 0 EA
Bit 2 EUROUP_SET 1=Enable 1 EA

8
Bit 3 CYRILLIC_SET 1=Enable 0 EA
Bit 4 FARSI_SET 1=Enable 0 EA
Bit 5 ARABIC_SET 1=Enable 0 EA
Bit 6 SOY 1=Enable 1 EA
Bit 7 DVB-T 1=Enable 0 EA
3. OP3
Bit Function Description Preset Remark
Bit 0 COLOR-AUTO 1=Enable 1 EA
Bit 1 COLOR-PAL 1=Enable 1 EA
Bit 2 COLOR-NTSC 1=Enable 1 EA
Bit 3 COLOR-N4.43 1=Enable 1 EA
Bit 4 COLOR-SECAM 1=Enable 0 EA
Bit 5 COLOR-PAL358 1=Enable 1 EA
Bit 6 NOISE REDUCE 1=Enable 1 EA
Bit 7 BLACK-STRETCH 1=Enable 0 EA
4. OP4
Bit Function Description Preset Remark
Bit 0 FMWS 1=Enable 1 AE
Bit 1 DIRECT_SWITCH-ON 1=Enable 0(X 射线保
护)
AE
Bit 2 WOOFER 1=Enable 0 EA
Bit 3 LOGO 1=Enable 1 EA
Bit 4 CHANNEL_IN_SCART 1=Enable 1 EA
Bit 5 IDENT_SENSITIVE 1=Enable 0 EA
Bit 6 HALFTONE 1=Enable 0 EA
Bit 7 ZOOM 1=Enable 0 1=Enable
遥控器
ZOOM 功能
EA
5. OP5
Bit Function Description Preset Remark
Bit 0 SOUND_BG 1= Enable 1 EA
Bit 1 SOUND_DK 1= Enable 1 EA
Bit 2 SOUND_I 1=Enable 1 EA
Bit 3 SOUND_L 1=Enable 0 EA
Bit 4 SOUND_M 1= Enable 0 EA
Bit 5 SEARCH_SOUND_SYS_OSD 1= Enable 0 EA
Bit 6 STANDBY——PIN 1=Enable 1(1= 高位
开机，0=
低位开机)
EA
Bit 7 STORE_AV 1=Enable 1 EA
6. OP6
Bit Function Descriptionn Preset Remark
Bit 0 MENU_BLUE 1=Enable 1 EA
Bit 1 BLUE_SCREEN 1=Enable 1 EA
Bit 2 CALENDAR 1=Enable 1 EA
Bit 3 CHILDLOCK 1=Enable 1 EA
Bit 4 TELETEXT_COLOUR_KEY 1=Enable 1 EA
Bit 5 HOTEL_MODE 1=Enable 1 EA
Bit 6 POR_WHEN_BLUE 1=Enable 0 EA
Bit 7 GAME 1=Enable 1 EA
7. OP7
Bit Function Description Preset Remark
Bit 0 SERVICE_KEY 1=Enable 0 EA

9
Bit 1 PROG_SET_ENABLE 1=Enable 0 EA
Bit 2 SVO 1=Enable 1 EA
Bit 3 TV_RC 1=Enable 0 EA
Bit 4 POWER_ALWAYS_ON 1=Enable 1 EA
Bit 5 PAL_PEAK_CENTRE0 1=Enable 1 EA
Bit 6 PAL_PEAK_CENTRRE1 1=Enable 1 EA
Bit 7 TIME 1=Enable 1 EA
8. OP8
Bit Function Description Preset Remark
Bit 0 FARSI 1=Enable 1 EA
Bit 1 ARABIC 1=Enable 1 EA
Bit 2 TURKISH 1=Enable 1 EA
Bit 3 KEY7_DVD 1=Enable 0 EA
Bit 4 MONO 1=Enable 0(POWER
KEY,)1=TV/DVD
KEY
EA
Bit 5 LOGO_CHANGE_CILOUR 1=Enable 1 EA
Bit 6 DISABLE TELETEXT TOP
MODE
1=Enable 1 EA
Bit 7 +6DB 1=Enable 0 EA
9 OP9
Bit Function Description Preset Remark
Bit 0 ENGLISH 1=Enable 1 EA
Bit 1 FRANCE 1=Enable 1 EA
Bit 2 GERMANY 1=Enable 1 EA
Bit 3 ITALY 1=Enable 1 EA
Bit 4 RUSSIA 1=Enable 1 EA
Bit 5 SPANISH 1=Enable 1 EA
Bit 6 PORTUGUESE 1=Enable 1 EA
Bit 7 DUTCH 1=Enable 1 EA
Note：Don’t adjust any OPTION items, please inform the engineer about any change.
5. ICs functional description
1. IC101:TDA9351
SYMBOL PIN DESCRIPTION
STANDBY 1 In STAND BY mode, low level (Power OFF).
For Power ON this pin will be high.
SCL 2 I2C-bus clock line
SDA 3 I2C-bus data line
VT 4 TUNER voltage
SYSTEM 5 TV system control
KEY IN 6 Control keys input
B1AND0(VOL) 7 Sound Volume control PWM output
VOL0 8 Sound mute output
GND 9 Digit ground for µ-controller core and periphery
DVD POWER 10 DVD power control
BAND1 11 STANDBY control
VSSA 12 Analog ground of digital ground of TV-processor
SEC PLL 13 Internally connected
VCC 14 2nd supply voltage TV-processor(+8V)
DECDIG 15 decoupling digital supply of TV-processor

10
PH2LF 16 Phase-2 filter
PH1LF 17 Phase-1 filter
GND3 18 Ground 3 for TV-processor
DECBG 19 Band gap decoupling
AVL 20 Automatic volume levelling
VDIVERB 21 Vertical drive B output
VDIVERA 22 Vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 Reference current input
VSC 26 Vertical sawtooth capacitor
RF AGC 27 Tuner AGC output
SIF 1 28 Audio deemphasize or SIF input
SIF 2 29 Decoupling sound demodulator
GND2 30 Ground 2 for TV processor
SIF AGC 31 Narrow band PLL filter
AV SWITCH 32 Avswitch
H DIR VER 33 Horizontal output
FBT 34 Flyback input/sandcastle output
AMIN 35 AM input
EHT 36 EHT/over voltage protection input
PLL IF 37 IF-PLL loop filter
VIDEO OUT 38 IF video output / selected CVBS output
8V 39 8v
V IN 40 internal CVBS input
GND 41 ground for TV processor
CVBS/Y 42 CVBS/SVHS(Y) input
C IN 43 SVHS (C) input
AUDIO 44 Audio output
INSW2 45 YUV insertion input
S.R 46 R input / V (R-Y) input / PR input
S.G 47 G input / Y input
S.B 48 B input / U (B-Y) input / PB input
BCL 49 Beam current limiter input
BLKI 50 Black current input
RO 51 Red output
GO 52 Green output
BO 53 Blue output
VDDA 54 Analog supply of Closed Caption decoder and digital supply of TV-processor (3.3 V)
VPE 55 Ground
VDDC 56 Digital supply to core (3.3 V)
OSCGND 57 Oscillator ground supply
XTALIN 58 Crystal oscillator input
XTALOUT 59 Crystal oscillator output
RESET 60 Ground
VCC 61 Digital supply to periphery (+3.3 V)
AV/TV 62 AV1 / AV2 mode Output.
SCARTIN/DVD
TRIGGER
63 SCARTINPUT/DVDmode Output.
REMOTE 64 Remote control signal input.
Note Pin TV SVHS AV1 AV2
62 1 0 0 1
63 1 1 0 0
2. IC102 24C08B/PCF0539
PIN Function
1 GND
2 GND
3 Upper resistance
4 GND
5 SDA data wire
6 SCL clock wire
7 GND

11
8 +5V Power
3. TV sound AM-demodulator and audio source switch (TDA9830)
Symbol PIN Function Symbol PIN Function
IFIN 1 sound IF differential input signal EXTIN 9 input signal (from external) to audio switch
n.c. 2 not connected SWITCH 10 switch input select control
CAGC 3 AGC capacitor Vp2 11 supply voltage +12 V (alternative)
CREF 4 REF voltage filtering capacitor MUTE 12 mute control
n.c. 5 not connected GND 13 ground (0 V)
AMOUT 6 AM demodulator output Vp1 14 supply voltage +5 to +8 V
AMIN 7 input signal (from AM) to audio switch n.c. 15 not connected
AFOUT 8 output signal from audio switch IFIN 16 sound IF differential input signal
4. Vertical deflection booster (TDA4863AJ)
Symbol PIN Function Symbol PIN Function
VP1 1 positive supply voltage 1 V-OUT 5 vertical output
VP3 2
flyback generator output INN 6 inverted input of differential input stage
VP2 3
supply voltage 2 for vertical output INP 7 non-inverted input of differential input stage
GND 4
ground or negative supply voltage
5.Tuner
PIN Function PIN Function
1 AGC 7 +5V
2 vacant 8 vacant
3 Gnd 9 Vt 33V
4 SCL 10 Gnd
5 SDA 11 IF Out
6 +5V
6. Test point Waveforms
7. IC voltages
TDA9351
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
5Vpp
0.9Vpp
1.3Vpp
H H
1Vpp
V
CRTKB
CRTKGCRTKR
95Vpp
95Vpp
95Vpp
H H H
TDA9351PIN53
2.5Vpp
2.5Vpp
3.8Vpp
H H
H
TDA9351 PIN52 TDA9351 PIN51
TDA9351 PIN33 TDA9351 PIN34
0.8Vpp
V
TDA9351 PIN21 TDA9351 PIN22 TDA9351 PIN59
1.2Vpp
2.6Vpp
H H
TDA9351 PIN40
TDA9351 PIN38

12
V 0 3.8 3.6 3.3 3.5 4.4 5.1 1.8 0 0.18 0.17 0 2.3 8 5 3
PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
V 4 0 4 0.5 0.7 0.8 1.9 1.9 3.9 3.8 1.6 3.2 2.3 0 2.3 0.2
PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
V 0.5 0.3 0 1.7 2.4 3.4 8 3.9 0 3.3 0 3.6 1.4 2.5 2.5 2.5
PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
V 1.9 5.0 2.4 2.4 2.4 3.1 0 3.2 0 1.8 1.7 0 3.2 5.1 3.3 5
TDA4863AJ
PIN 1 2 3 4 5 6 7
13 10.5 13.1 0 0.22 0.2 0.2
TDA9830
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1.75 0 2.32 4.37 0 2.2 2.2 2.3 2.2 0 12 3 08 0 1.75
24C08B/PCF0539
PIN 1 2 3 4 5 6 7 8
V 0 0 5.1 0 3.2 0 0 5.1
8. PURITY / CONVERGENCE ADJUSTMENT

13
PURITY ADJUSTMENT
1. Demagnetize CRT with the demagnetizer.
2. Loosen the retainer screw of the deflection yoke.
3. Remove the wedges.
4. Input a green raster signal from the signal generator,
and turn the screen to green raster.
5. Move the deflection yoke backward.
6. Bring the long lug of the purity magnets on the short
lug and position them horizontally. (Fig2)
7. Adjust the gap between two lugs so that the GREEN
RASTER will come into the centre of the screen.
(Fig. 3)
8. Move the deflection yoke forward, and fix the position
of the deflection yoke so that the whole screen will
become green.
9. Insert the wedge to the top side of the deflection yoke
so that it will not move.
10. Input a crosshatch signal.
11. Verify that the screen is horizontal.
12. Input red and blue raster signals, and make sure that
purity is properly adjusted.
CRT
WEDGE
DEFLECTION YOKE
P
4
6
P: PURITY MAGNET
4: 4-POLES (convergence magnets)
6: 6-POLES (convergence magnets)
P/C MAGNETS
Fig. 1
PURITY MAGNETS
Long lug
Short lug
Bring the long lug over the short lug and
position them horizontally.
Fig. 2
(FRONT VIEW)
GREEN RASTER
CENTER
Fi
g
. 3

14
STATIC CONVERGENCE ADJUSTMENT
1. Input a crosshatch signal.
2. Using 4-pole convergence magnets overlap the red
and blue lines in the center of the screen (Fig. 1) and
turn them to magenta (red/blue).
3. Using 6-pole convergence magnets overlap the
magenta (red/blue) and green lines in the center of the
screen and turn them to white.
4. Repeat 2 and 3 above, and make the best
convergence.
DYNAMIC CONVERGENCE ADJUSTMENT
1. Move the deflection yoke up and down and overlap
lines in the periphery. (Fig. 2)
2. Move the deflection yoke left to right and overlap the
lines in the periphery. (Fig. 3)
3. Repeat 1 and 2 above, and make the best
convergence.
After adjustment, fix the wedge at the original position.
Fasten the retainer screw of the deflection yoke.
Fix the 6 magnets with glue.
(FRONT VIEW)
Fig. 1
(FRONT VIEW)
RED GREEN BLUE
BLUE
RED
GREEN GREEN
RED BLUE
BLUE GREEN RED
Fig.2
(FRONT VIEW)
RED GREEN BLUE BLUE GREEN RED
RED
GREEN
BLUE
BLUE
GREEN
RED
Fig. 3

15
9. DVD Part: Introduction of MTK1389D maintenance
NOTE: MTK1389D is a type of LSIC for DVD decode .MTK1389D IC consists of
RF,SERVO,DSP,DECODE,VIDEO DAC and AUDIO DAC.
1. Under normal power supply conditions, the maintenance plan for MT1389D mono-chip is: first the reset
circuit resets the MT1389D, after the crystal oscillator circuit gave the clock signal to MT1389D, MT1389D will
start the initialization check for Flash、E2PROM、SDRAM, after everything is checked to be normal, it will start
initialization check for built-in Audio DAC, servo and motor Driver IC .
2. If the all the a.m. parts are good, then MT1389D will send signal to motor Driver to drive the servo
system，pick up then to generate DVD light for collection, tracing the main shaft to check if there is any disc, and
confirm if it is CD format or DVD format disc. If the disc is in DVD format, the system will read the data from the
disc directly; if it is in CD format built-in servo will drive the CD laser to send out CD light and read the data, the
data then will be amplified through built-in RF amplifier and sent to MT1389D decode part for data processing,
released by MPEG and resolved into video data and audio data, then they will be returned to analog signals
through built-in VIDEO DAC、AUDIO DAC.
Decoder section
3. There is power supply, clock and reset, but the system does not work.
1）Check if all the address wires required for FLASH are exist, and if they are in normal status,
especially check if the A0~A15 of FLASH have normal signals, if there aren’t, then inspect MT1389D to see if
there is faulty soldering. If there are normal signals at A0~A15, check if the address data signal of MT1389D
and SDRAM is normal. If it is normal, then check the signal at A16~A19 of MT1389D; if there are also signals,
then check the video output wires and AV filter circuit; if there is no signal, then check the corresponding pins
of MT1389D to see if there is any short circuit, break or faulty soldering.
4. System in normal operation, but the audio has no sound.
1）Because the AUDIO DAC is built in MTK1389D IC.you need to check the lower passing amplifying
circuit and the MUTE circuit at the back of the LPF circuit. Also check if there is any power supply to the LPF
circuit.
2）Check if the power supply voltage required for playing is at normal level.
Servo Section
5. After the LOGO of the machine shows normally, there is no OSD display. This problem mainly is caused
by the abnormality built-in RF and servo, possible problems may be:
1）Built in RF and its surrounding circuits have problems.
2) Servo part of MT1389D has problems.
6. OSD display is normal，while there is no action of servo part（feeding motor does not work, main shaft does
no turn, possible fault status are:
1) The corresponding signals giving by MT1389D to DMSO、FMSO are missing, the reason may be the
problem of MT1389D or the communication between MT1389D and motor Driver IC SA5668.
2) Not output from Motor Driver, the reason may be the problem on motor Driver or its corresponding
circuit.
7. Servo part in good status, while there is no pick up action（no light, no focus）
1）No light, check the power supply（power supply for pick up）, or the light producing driving circuit to see
if they are in normal status.
2）No focus, check MT1389D to see if there is signal output from FOSO、TRSO.
Secondly, check motor driver to see if there is F+、F-、T+、T-signal output.
Thirdly, check the external corresponding circuit of the motor driver to see if there is any problem.
8. All the servo part has action, while it cannot read out the disc
1）Check MT1389D if there is RF net picture output, if there isn’t, then it must be the problem of
MT1389D and external surrounding circuits, it there is output, then it might the problem of MT1389D
and its surrounding circuits.
2）There is RF signal，but not in normal status，then check MT1389D and surrounding circuits.
3）Everything is normal, but the disc cannot be read out, check MT1389D and its surrounding circuit

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Haier Group
Haier Industrial Park, No.1, Haier Road
266101, Qingdao, China
http://www.haier.com