Haier DTA21F81 User manual

SERVICE MANUAL
Colour Television
Haier model:
DTA21F81
Customer model:
TCF20
 FEATURES
 DVD-TV 20” COMBO
 AUTO TUNE/181 CHANNES
 DVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3 COMPATIBLE
 FORMATO DE VIDEO 4:3PS、4:3LB
 DOLBY AC-3 DECODE
 PANATAL LOCK
 ATSC TUNER
CAUTION READ
THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLE CORRECTLY BEFORE OFFERING
SERVICE.
TV-8888-113

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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…………………………………………………………………12
6. Test point waveform………………………………………………………………………14
7. All ICs voltages……………………………..……………………………………………….15
8. Purity / convergence adjustment………………………………………………………16
9. DVD maintenance…………………………………………………………………………18
10. Circuit Diagram …………………………………………………………………………19

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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 R2J10165GC series with stereo 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 “MENU”
“8””8””9””3” buttons in sequence to enter into factory status.
2) If the memory IC haven’t been written with the initial data, press [Program+] / [Program-] to select
item INIT and press [VOLUME+] / [VOLUME-] 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 [Program+] / [Program-] keys and set value by [VOLUME+] / [VOLUME-] keys.
4) Press “EXIT” button to return to the normal screen.
4. SERVICE ADJUSTMENT
Specific operation: use remote controller
Press “MENU” “8””8””9””3” buttons in sequence to enter into factory mode.Press “MENU” to enter into
next factory menu.
Press [Program+] / [Program-] to select items and press [VOLUME+] / [VOLUME-] key, to make data
adjustment of corresponding factory menus.
Press “EXIT” 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 NTSC standard complete pattern signal.
Adjustment steps：
a) Adjust
V SC, S emendation
b) Adjust
V SIZE, to get 92% of vertical picture contents would be displayed on CRT.
c) Adjust
V POS, the centre horizontal line corresponds to CRT vertical centre.
d) Adjust
V LIN, to the linearity of P card field is in proper condition.
e) Adjust H PHASE, to get the picture horizontal centre correspond to CRT horizontal centre.
Receive NTSC signal and repeat above adjustment.

6
AGC Adjustment
Receive 60dBµ (1mV) VH colour bar pattern signal.
Select RF AGC 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 “MENU” key to page 2, when the screen shows”VK” adjust the SCREEN control on Fly back
transformer to make the screen show alternating flashing characters to darkle.
b) White balance adjustment
1. Receive a Black and White pattern.
2. Adjust RC, GC, BC,RD,BD items to get colour temperature 9300K ±3 JND.
A3. Error Detection Process
1.
Check to see if
Fuse is normal
No light and sound
A
bnormal
Check D901~D904,
C914, IC9601, Q901
Check to see if the
collector voltage of
D909 is 13.5V
The failure ofhorizontal unit
orN204
Check to see
if , ZD201 8v,
is normal
Check the control
voltage of Q207 or
CPU power pin
Check IC602 ,ect
Normal
Normal
Normal
A
bnormal
Check to see 110V、180V
etc. voltage is normal
Test to see all terminal
Resistance of load
Check switch
power unit
Check to see if
rectifying tube
is normal
Check the
Loader
Change
rectifying diode
A
bnormal
Normal
Abnormal
Normal
A
bnormal
Normal
A
bnormal
The failure of horizontal
unit or IC201
Maintenance Service and Trouble shooting

7
2
Normal
A
bnormal
Video amplifying
board is abnormal
T401, D402 or
C419,C420 are
broken
Q402 is not well
welded or open
Higher Lower
Inspect the circuit
from pin51 、52、
53 of IC201 to
video amplifying
Check the voltage
of Q402 collector is
normal
InspectT402、R427
etc.
Normal
A
bnormal
NO
YES
A
bnormal
Normal Normal
A
bnormal
A
bnormal
Normal
Check the voltage
of all pins of SK501
Heater Resistor
open
Check to see if be
voltage of Q402 is
existed?
Check the circuit
from pin15 of IC201
to Q402
No raster
Whether G2 voltage is normal
Change wrong component
or check
Check to see if +8V
voltage is normal at
PIN 10 or 14 of IC201
Check X201、IC201 and
peripheral circuit of IC201
Check +8V ,+5V power
A
bnormal
Normal
Test filament voltage Test the base voltage of Q402
Maintenance Service and Trouble shooting

8
3
4.
Check to see if the deflection
yorks are connected, C404 is
open or weldless. Inspect
peripheral component of IC401
and IC401 itsel
f
Inspect +28V
p
ower su
pp
l
y
Inspect IC201
and peripheral
components of
I
C
2
0
1
Change IC201 and
repair circuit
Normal
Yes No Yes No
Check to see if the voltage o
f
pin 11 and pin12 of IC201 is
normal
Check to see if voltage of pin2 at
IC401 is normal
Yes No
Make R429 open. Multimeter is at range RΧ1K. Red
probe connects to ground. Touch No.5 of IC401 with
black probe. Bright line flashes for a moment
Horizontal bright line
Snowy noise exist
No sound and picture
Not exist Exist
Check to see if RAGC is
at 00 mode
Check to see if voltage
output available at tuner
Enter D-MODE with
customer remote controller.
Make RAGC tuned to 25 or
so. Noise on picture just
disappears.
Inspect SAW101、
IC201and PIF part
Yes No
Antenna
or tuner is
abnormal
Inspect the
circuit from
CPU to tuner
Yes No
Maintenance Service and Trouble shooting

9
5
6.
Make C713/C714 open. Multimeter is at band RΧ1K. Red
probe connect to ground. Touch No.6 OR No.8 of IC701 with
Picture exists but no sound
Make C713 OR C714 collector
open. Touch No.6 OR No.8 of
Q702 with black probe to see if
Power amplifier is abnormal.
Inspect IC701 and peripheral
components of IC701
Inspect C713、C714 Check to see if
+16V exists
Inspect IC201 and peripheral
component of IC201
Inspect +16V
power supply
Yes No
Yes No
Yes No
Have noise
N
o noise
Inspect Inspect the circuit from
No.51 of IC201 to
No.3 of SK501
Yes
No
Change V501 or
weld V501 again
Check to see if voltages of SK501
are normal
Lack of red
Check to see if V501 is
open or not well welded
Inspect R502,R503,R504
Maintenance Service and Trouble shooting

10
Adjustable Items
P1：
Items Preset Remark Description
H PHASE 0 ~ 31 14 ★Horizontal shift
VSIZE 0~63 20 ★Vertical amplitude
VPOS 0~7 2 ★Vertical shift
VLIN 0~63 29 ★Vertical slop
VSC 0~63 32 ★S emendation
PARABOLA 0 ~ 63 32 ★S-correction
TRAPEXIUM 0 ~ 63 32 ★Echclon distortion correction
HSIZE 0~63 32 ★Horizontal amplitude
CORNER 0 ~ 63 40 ★TOP Vertical distortion correction
注：
P2：
Items Preset Remark Description
RC 0 ~ 255 120 ★White point R
GC 0 ~ 255 120 ★White point G
BC 0 ~255 120 ★White point B
RD 0 ~ 127 70 ★Black level offset R
BD 0 ~ 127 75 ★Black level offset B
SB 0 ~ 127 47 ★Aassistant brightness adjust
VK 0~1 0 ★Horizontal line choice [field surge stop choice]
WB BRI 0 ~ 127 47 ★Horizontal line brightness
P3：
Items Preset Remark Description
RB YUV -128~ 128 0 ◆IN YUV，Black level offset R
GB YUV -128~ 128 0 ◆IN YUV，Black level offset G
BB YUV -128~ 128 0 ◆IN YUV，Black level offset B
RD YUV -128~ 128 0 ◆IN YUV，White point R
BD YUV -128~ 128 0 ◆IN YUV，White point B
CR PEDDOT 0~15 8 ◆CR benchmark voltage adjust
CB PEDDOT 0~15 8 ◆CB benchmark voltage adjust
CRCB PED ON 0~1 1 ◆YUV benchmark voltage switch
CRCB GAIN UP 0~1 0 ◆YUV benchmark voltage plus
P4：
Items Preset Remark Description
VIF VCO OK OK ◆Picture IF adjust
STRAP OK OK ◆Sound frequency adjust
RF AGC 0 ~ 127 35 ◆AGC adjust
VIDEO LVL 0 ~ 7 7 ◆Video demodulation output voltage control
P5：
Items Preset Remark Description
OSD HP 0 ~ 63 35 ◆OSD Horizontal vision position adjust
OSD VP 0 ~ 31 21 ◆OSD Vertical vision position adjust
HTONE 0~1 0 ◆Translucence ON-OFF
AOSD 0~1 0 ◆A/D OSDchoice; 0 = D OSD; 1 = A OSD;
OSDL 0~1 0 ◆D OSD output voltage choice; 0 = 70%; 1 = 90%
TITLE 0 ~ 127 57 ◆OSD title color choice
MENU 0 ~ 127 79 ◆OSD color choice
MENU HL 0 ~ 127 57 ◆OSD pitch on color choice

11
P6：
Items Preset Remark Description
ENG 0~1 1 №English OSD ；ON = Y；OFF = N
FRE 0~1 1 №French OSD ON = Y；OFF = N
SPA 0~1 1 №Spanish OSD ON = Y；OFF = N
POR 0~1 0 №Portugal OSD ON = Y；OFF = N
DVD MD 0 ~ 3 1 №DVD signal format，0:CVBS；1:YC；2:YUV；3：hold
DVD OFF T 0~ 127 0 №Power off DVD off delay time
2DVD BLK T 0~ 255 70 №Tv to DVD black screen time
P7：
Items Preset Remark Description
ON DLY T 0 ~ 15 6 №Power on black screen time；0-15s
AVS MUTE TIM 0 ~ 255 30 №Change channal black screen time;10ms
LOGO COLOR 0 ~ 7 1 №Label color choice
LOGO 0 ~ 1 0 №Label choice ON-OFF ON =Y; OFF =N
INT AUDIO 0 ~ 1 1 №Inside volume cortrol choice；ON = IN；OFF = OUT PWM
BTSC 0~1 0 ◆MTS ON-OFF
FACSW 0~1 0 №Foctory adjust hotkey；ON = Y；OFF = N
POWMD 0~3 0 №Power 0=standby，1=power ON，2=memory，3=else
C_10164/5 070119 №ATV software edition
P8：
Items Preset Remark Description
AUTO/N/PM/PN 0 ~ 1 1 ◆AUTO/N/PM/PN function choice
AUTO/N/N4/P 0 ~ 1 0 ◆AUTO/N/PM/PN function choice
PAL 0~1 0 ◆PAL ；0 = N；1 = Y
NTSC 0~1 1 ◆NTSC；ON = Y；OFF = N
N443 0 ~ 1 1 ◆NTSC4.43；ON = Y；OFF = N
P358 0 ~ 1 0 ◆3.58PAL；0 = N；1 = Y
PALM 0~1 0 ◆PAL – M；ON = Y；OFF =N
PALN 0~1 0 ◆PAL-N；ON = Y；OFF = N
P9：
Items Preset Remark Description
AV2 0~1 1 ★AV 2 ；1= Y；0 = N
YUV 0~1 0 ★YUV；1 = Y；0 = N
DVD 0 ~ 1 0 ★DVD；1= Y；0 = N
P10：
Items Preset Remark Description
YDL 0~7 5 №Brightness signal delay time adjust
YLPF 0~1 0 №Brightness signal output low pass choice switch;0 = flat
out; 1 = low out(fc = 700kHz)
BLK STE OFF 0 ~ 1 0 №Black voltage extend function switch; 0 = ON; 1=OFF
GAMMA 0~3 0 №GAMMA adjust control; 0 = OFF; 1~3 = ON(3 mode)
ABCL 0~1 0 №AUTO brightness and contrast limit; 0 = AUTO contrast
limit; 1 = AUTO brightness and contrast limit
ABCL GAIN 0 ~ 1 0 №AUTO brightness and contrast limit plus switch; 0 = low; 1
= high

12
UDL 0~3 3 №U signal delay adjust
VDL 0~3 0 №V signal delay adjust
LCNR 0~63 32 №Down pillow shape distortion
P11：
Items Preset Remark Description
CTRAP 0~3 2 №Colour trap wave adjust
HVCO 0~7 3 №Row frequency adjust
SIFBFP 0~3 0 №SIFstrap pass width choice
SIF45 G DN 0 ~ 1 0 №4.5Mhz sound plus attenuation switch；0 = normal；1 =
attenuation。
STRAPOFF 0~1 0 №Sound trap wave switch
AFC1 UP 1 0 ~ 1 1 №Level AFC1 plus adjust
AFC1 UP 2 0 ~ 1 1 №Level AFC1 plus adjus
AFC2 DOWN 0 ~ 1 0 №Level AFC2 plus adjus
AFC2UP 0~1 1 №Level AFC2 plus adjus
.
5. ICs functional description
1. IC201 R2J10165GC
SYMBOL PIN DESCRIPTION
SP00/14bPWM 1 SP00/14bPWM
SP01/PWM 2 SP01/PWM
SP02/PWM 3 SP02/PWM
SP03/PWM 4 SP03/PWM
TEST0 5 TEST0
P04/AD2 6 P04/AD2
P05/AD1 7 P05/AD1
P06/TIM31 8 P06/TIM31
AFT(AD0) 9
SIF auto phase control
DEF VCC(8.0V) 10 8V POWER
V RAMP(+) 11 V RAMP(+)
VRAMP CAP 12 VRAMP CAP
AFC 1 FIL 13 SIF auto phase control filter
DEF VCC(5.0V) 14 5V POWER
H OUT 15 Horizontal SIGNAL OUT
FBP IN 16 FBP IN
DEF GND 17 GND
VRAMP AGC 18 VRAMP AGC
Cb IN YcbCr 19 Cb IN YcbCr
Cr IN YcbCr 20 Cr IN YcbCr
C-APC 21 C-APC
XTAL 22 XTAL
CHROMA GND 23 CHROMA GND
Y SW OUT 24 Y SW OUT
TEST/EW OUT 25 TEST/EW OUT
MCU 5.7 VDD OUT 26 MCU 5.7 VDD OUT
PAL ID FIL 27 PAL ID FIL
8.7V REG OUT 28 8.7V POWER OUT
EXT AU(L)IN/EXT AU2
IN
29 EXT AU(L)IN/EXT AU2 IN
EXT2 IN/C IN YC 30 EXT2 IN/C IN YC
CHROMA VCC(5.0) 31 CHROMA VCC(5.0)
EXT 1 IN/YIN YC/YIN Y
CbCr
32 EXT 1 IN/YIN YC/YIN Y CbCr
5.7V REG OUT 33 5.7V POWER OUT
VIF VIDEO OUT 34 VIF VIDEO OUT
VIF GND 35 GND

13
VIF APC 36 VIF APC
RF AGC 37 RF AGC
VIF IN2 38 VIF IN2
VIF IN1 39 VIF IN1
VIF AGC 40 VIF AGC
VIF VCC F/B 41 VIF VCC F/B
VIF VCC(5.0V) 42 5.0V POWER
EXT AU（R）IN/EXT AU1
IN
43 EXT AU（R）IN/EXT AU1 IN
AU BYPASS 44 AU BYPASS
SIF MIX F/B 45 SIF MIX F/B
AU ATT（R）OUT/ATT
OUT
46 AU ATT（R）OUT/ATT OUT
DIRECT OUT 47 DIRECT OUT
AU ATT（L）OUT/ATT
OUT
48 AU ATT（L）OUT/ATT OUT
ACL/ABCL 49 ACL/ABCL
HI VCC（8.0）50 HI VCC（8.0）
R OUT 51 R OUT
G OUT 52 G OUT
B OUT 53 B OUT
VREG VCC（8.7V）54 VREG VCC（8.7V）
MNITOR-OUT 55 MNITOR-OUT
MCU RESET 56 MCU RESET
P20 57 P20
P21 58 P21
P22 59 P22
HLF 60 HLF
VHOLD 61 VHOLD
CVIN 62 CVIN
P26/AD6 63 P26/AD6
AD6/P27 64 AD6/P27
P35/TIM21 65 P35/TIM21
CNVSS 66 CNVSS
TEST1 Note1 67 TEST1 Note1
TEST2 Note2 68 TEST2 Note2
VSS 69 VSS
FILT 70 FILT
VDD 71 VDD
P36 72 P36
P17/INT3/AD4 73 P17/INT3/AD4
P16/INT2/AD3 74 P16/INT2/AD3
P15/INT1 75 P15/INT1
P10 76 PIN 10
P11/SCL1 77 I2C-bus clock line 1
P12/SCL2 78 I2C-bus clock line 2
P13/SDA1 79 I2C-bus data line 1
P14/SDA2 80 I2C-bus data line 2
2. IC602 24C16
PIN Function
1 GND
2 GND
3 Upper resistance
4 GND
5 SDA data wire
6 SCL clock wire
7 GND
8 +5V Power

14
3. IC701: Sound power amplify (TFA9800J)
Symbol PIN Function Symbol PIN Function
-INV1 1 Non-inverting input 1 Vp 7 Supply voltage
SGND 2 Signal ground M/SS 8
Mute/standby switch
input
SVRR 3
Supply voltage ripple
rejection output -INV2 9 Non-inverting input 2
Out 1 4 Output 1
PGND 5 Power ground
OUT2 6 Output 2
4. IC401: Vertical output (STV9302A()
Symbol PIN Function Symbol PIN Function
INPUT 1 Inverting input
Poutput stage
supply 6 Output stage supply
SUPPLY VOLTAGE 2 Supply voltage Input 7 Non-inverting input
Flyback generator 3 Flyback generator
GND 4
Ground or negative
supply
Output 5 Output
5. U101：Tuner
PIN Function PIN Function
1 Nc 7 +5V
2 Tu 8 IFA1
3 Rf agc 9 IF AGC
4 SCL 10 IFD 1OUT
5 SDA 11 IFD 2 OUT
6 Btl
6. Test point Waveforms
5Vpp
0.9Vpp
1.3Vpp
H H
1Vpp
V
CRTKB
CRTKGCRTKR
95Vpp
95Vpp
95Vpp
H H H
R2J10165GC
2.5Vpp
2.5Vpp
3.8Vpp
H H
H
R2J10165GC R2J10165GC
R2J10165GC R2J10165GC
0.8Vpp
V
R2J10165GC R2J10165GC R2J10165GC
1.2Vpp
2.6Vpp
H H
R2J10165GC
R2J10165GC

15
7. IC voltages
R2J10165G
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
V 0 0.02 4.9 0.03 0 4.72 0.04 0.15 2.05 8.04 2.99 2.36 3.2 5 0.83 0.93
PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
V 0 2.04 1.15 1.15 2.97 3.2 0 3.76 3.91 5.59 2.28 8.73 3.29 1.97 5 2.73
PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
V 5.68 2.86 0 2.74 0.17 1.47 1.47 2.53 3.09 5 3.3 3.45 2.4 3.43 3.15 3.43
PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
V 2.47 8.03 2.57 2.49 2.59 8.87 0.42 4.9 4.94 4.95 3.82 1.96 0.33 2.9 4.95 4.94
PIN 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
V 4.95 0 0.16 4.95 0 1.76 4.95 4.95 4.94 4.83 0.03 4.95 3.52 3.7 3.58 3.73
STV9302A
PIN 1 2 3 4 5 6 7
V 2.993 26.8 14.57 0 1.96 26.05 2.991
TFA9800J
PIN 1 2 3 4 5 6 7 8 9
V 2.15 0 7.53 7.5 0 7.51 15.48 13.93 2.122
24C16
PIN 1 2 3 4 5 6 7 8
V 0 0 0 0 4.95 0 3.52 3.58

16
8. PURITY / CONVERGENCE ADJUSTMENT
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 an
d
p
osition them horizontally.
Fig. 2
(FRONT VIEW)
GREEN RASTER
CENTER
Fi
g
. 3

17
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

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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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10.Circuit Diagram

20
Sincere Forever