A51QDX993X
21-inch, aspect ratio 4:3, flat
square face type, tinted
RM-C1261-2H
(AA/R06/UM-3 battery × 2)
---
Design & specifications are subject to change without notice.
1-2 (No.YA124)
SECTION 1
PRECAUTION
1.1SAFETY PRECAUTIONS
(1) The design of this product contains special hardware,
many circuits and components specially 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, the 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 the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). 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 B1 POWER SUPPLY check).
(6) The high voltage appli ed to the picture tube must confo rm
with 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 d rawing 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 g round frame
and connecting the other end of the lead through a 10kΩ
2W resistor to the anode button.
(8) When service is required, ob serve 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.
a) 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 a test equipment not generally
found in the service trade.
b) Leakage Current Chec k
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer 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 1000Ω per volt or more
sensitivity in the following manner. Connect a 1500Ω
10W 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 ac ross 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.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
0.15 F AC-TYPE
PLACE THIS PROBE
1500 10W
GOOD EARTH GROUND
ON EACH EXPOSED
METAL PART
(No.YA124)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1FEATURES
• New chassis design enables use of an interactive on-screen control.
• Pure flat CRT produces fine textured picture in every detail.
• Wide range voltage (110V ~ 240V) for AC power input.
• With AUDIO/VIDEO input terminals.
2
C bus control utilizes single chip ICs.
•I
• By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged
automatically.
• Built-in OFF TIMER & RETURN +.
2.2MAIN DIFFERENCE LIST
ItemsAV-21CMG4/GAV-21CMT4/GAV-2104C/E
MAIN PWB ASS'YSCW-1059A-H2SCW-1058A-H2SCW-1065A-H2
FRONT CABINET ASS'YGG10263-005A-HGG10263-004A-HGG10263-001B-H
PICTURE TUBEA51LXR195X←A51QDX993X
REMOTE CONTROL UNITRM-C1261-2HRM-C1260-2HRM-C1261-2H
40Gnd2- GND
41PllIf- IF-PLL loop filter
42SifAgc- AGC sound IF
43IfVo/FmRo/DvbOO Not used
44NCO Not used
45V8AudioSwitchesI8V
46AgcSsif- AGC capacitor second sound IF
47V5P2I5V
48V-OUTO Video output
49L1IAudio-L1 input
50R1IAudio-R1 input
51V3IVideo V3 input
52C4INot used
53Audio2InLINot used
54Audio2InRINot used
55V2/YIVideo V2 input
56L2IAudio L2 input (Left signal)
57R2IAudio R2 input (right signal)
58Y3/CvbsIS-Video Y1 input
59C1IS-Video C1 input
60AudioLsLO
61AudioLsRO
62HP-LO Headphone L
63HP-RO Headphone R
Pin nameI/OFunction
Ssif/RefIn/Avl/RefOut
QssO/AmO/AudeEm
O
Automatic Volume Levelling/ soun d IF input /
subcarrier reference output / external reference
signal input for I signal mixer for DVB operation
O QSS intercarrier output / AM output /
deemphasis / (front-end audio out)
Audio L output for audio power amplifier
Audio R output for audio power amplifier
Pin
no.
64CVBSO/PIPO CVBS / PIP output
65SVMO Scan velocity modulation output
66FbiSoI Flyback input/sandcastle output
67HoutO Horizontal output
68VssComb- GND
69V5CombI5V
70Vin/R2/PrIPIP R input
71Uin/B2/PbIPIP B input
72Yin/G2/YIPIP G input
73YsyncINot used
74YoutO Not used
75Uout/INSSW2IYUV insertion input
76NCO Not used
77INSSW3IYUV insertion input
78R3/PrIComponent PR input (Video-2)
79G3/YIComponent Y input (Video-2)
80B3/PbIComponent PB input (Video-2)
81Gnd3- GND
82V5P3I5V
83BCLIBeam current limiter input
84BLKINIBlack current input
85RoutO R output
86GoutO G output
87BoutO B output
88V3.3A1I3.3V
89RefAdN- GND
90V3.3RefAdPI3.3V (Positive)
91RefAdI3.3/2V
92GndA- GND
93V1.8AI1.8V
94V3.3A2I3.3V
95VssADC- GND
96V1.8ADCI1.8V
97REMOTEIRemote control
98PW_LEDIPOWER LED control
99P11/TOI POWER LED control
100 V1.8C2I1.8V
101 VssC2- GND
102
103
104 VER_PROTECTO X-ray protect
105 S_REDUCEO Sound control
106 P00/I2SDI1O Not used
107 POWERO SUB POWER control
108 SCL1II2C bus clock
109 SDA1I/O I2C bus data
110 V3.3PI3.3V
111 ROTATIONO ROTATION
112 3.58/OTHERO NTSC 3.58 detection
113 A_MUTEO Audio muting
114 4.5/OTHERO NTSC 4.43 detection
115 PROTIProtect
116 ECO_INIECO sensor level detection
117 V1.8C1I1.8V (Digital)
118 DecV1V8I1.8V
119 KEY_INI Key scan data
120 VDO-DETIVideo DET input
121 VSSC1+P1- Digital GND
122 P24/PWM3IS-Video DET input
123 P25/PWM4O GTVA_reset
124 V1.8C3I1.8V (Digital)
125 VssC3- GND
126 P12/Int2IExternal interrupt
127 SDA0I/O I2C bus data (for memory)
128 SCL0II2C bus clock (for memory)
Pin nameI/OFunction
COMPONENT-PIP
COMB_SW_NT3.5/OTHER
- Not used
- Not used
(No.YA124)1-7
SECTION 3
DISASSEMBLY
3.1DISASSEMBLY PROCEDURE
3.1.1 REMOVING THE REAR COVER
• Unplug the power cord.
(1) Remove the 5 screws [A], 2 screws [B] and 1 screw [C] as
shown in Fig.1.
(2) Withdraw the REAR COVER toward you.
CAUTION:
When reinstalling the rear cover, carefully push it inward after
inserting the MAIN PWB into the REAR COVER groove.
3.1.2 REMOVING THE MAIN PW BOARD
• Remove the REAR COVER.
(1) Slightly raise the both sides of the MAIN PWB by hand.
(2) Withdraw the MAIN PWB backward.
(If necessary, take off the wire clamp and connectors, etc.)
3.1.3 REMOVING THE SPEAKER
• Remove the REAR COVER.
(1) Remove the 4 screws [D] as shown in Fig.1.
3.1.4 CHECKING THE MAIN PW BOARD
• To check the back side of the MAIN PWB.
(1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN
PW BOARD).
(2) Erect the MAIN PWB vertically so that you can easily check
its back side.
CAUTIONS:
• Before turning on power, make sure that the CRT earth wire
and other connectors are properly connected.
• When repairing, connect the DEG. COIL to the DEG.
connector on the MAIN PWB.
• When repairing, connect the DEG. COIL to the DEG.
connector on the MAIN PWB.
3.1.5 WIRE CLAMPING AND CABLE TYING
(1) Be sure to clamp the wire.
(2) Never remove the cable tie used for tying the wires
together.
Should it be inadvertently removed, be sure to tie the wires
with a new cable tie.
1-8 (No.YA124)
FRONT CABINET
PICTURE TUBE
MAIN PWB
(CRT SOCKET PWB)
SPEAKER
D
(x4)
REAR COVER
MAIN PWB
FBT
A
(x5)
Fig.1
C
B
(x2)
(No.YA124)1-9
3.2REPLACEMENT OF MEMORY IC
3.2.1 MEMORY IC
This TV uses the following memory IC.
Memory IC: IC702 on MAIN PWB
The memory IC memorizes data for correctly operating the video
and deflection circuits. When replacing the memory IC, be sure
to use the same type IC written with the initial values of data. In
other words, use the specific IC listed in "PRINTED WIRING
BOARD PARTS LIST". For its mounting location, refer to
"ADJUSTMENT LOCATIONS".
3.2.2 PROCEDURE FOR REPLACING MEMORY IC
1. Power off
Switch the power off and unplug the power cord from the wall
outlet.
2. Replacing the memory IC
Replace the memory IC with new one. Be sure to use the
memory IC written with the initial data values.
3. Power on
Plug the power cord into the wall outlet and switch the power on.
4. Check and setting of SYSTEM CONSTANT SET:
(1) Press the [DISPLAY] key and the [PICTURE MODE] key
on the remote control unit simultaneous l y.
The SERVICE MENU screen will be displayed.(See
Fig.1.)
(2) In the SERVICE MENU, press the [DISPLAY] key and
[PICTURE MODE] key simultaneously. Then, the
SYSTEM CONSTANT SET screen will be
displayed.(See Fig.2.)
(3) Check whether the setting values of the SYSTEM
CONSTANT SET are the same as those indicated in
Table 1.
If the value is different, select the setting item with the
MENU [] / [] key, and set the correct value with the
MENU [] / [] key.
(4) Press the [DISPLAY] key twice to return to the normal
screen.
5. Receive channel setting
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (channels preset).
6. User setting
Check the user setting values in Table 2 and Table 3. If setting
value is different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
7. Setting of SERVICE MENU
Verify the setting for each setting item in the SERVICE
MENU.(See Table 4.) If readjustment is necessary, perform
adjustment referring to "ADJUSTMENTS PROCEDURE".
SERVICE MENU
SERVICE MENU
1. IF
3. AUDIO
5. VSM W/B
7. PLUG & PLAY (ON)
1-7 : SELECTDISPLAY : EXIT
******* **** ***** *****
**** **** *** ***
2. V/C
4. DEF
6. S TATUS
Fig.1
SYSTEM CONSTANT-1
SYSTEM CONSTANT SET 1
SYSTEM
COMB
TILT
SUPER BASS
TEXT
LANGUAGE
: SEL : OPE
SYSTEM CONSTANT-2
SYSTEM CONSTANT SET 2
SOUND
BILINGUAL
BLUE BACK MUTE
COLOUR AUTO
ECO SENSOR
: SEL : OPE
SYSTEM CONSTANT-3
SYSTEM CONSTANT SET 3
SURROUND
: SEL : OPE
MULTI
NO
NO
NO
NO
ERAPF
DISP : EXIT
MONO
NO
NO
YES
NO
DISP : EXIT
NO
NOPICTURE BOOSTER
NOCOMPONENT
NOPIP
NOS INPUT
DISP : EXIT
PICTURE MODE
DISPLAY / BACK
MENU
1-10 (No.YA124)
NAME OF REMOTE CONTROL KEYS
MENU OK
MENU
MENU
MENU
Fig.2
3.2.3 FACTORY SETTING VALUE
SETTING OF SYSTEM CONSTANT SET
Setting itemSetting content
AV-21CMG4/G
Setting value
AV-21CMT4/G
AV-2104C/E
SYSTEM
COMB
TIL T
SUPER BASS
TEXT
LANGUAGE
SOUND
BILINGUAL
BLUE BACK MUTE
COLOUR AUTO
ECO SENSOR
SURROUND
PICTURE BOOSTER
COMPONENT
PIP
S INPUT
MULTI TRIPLE PAL THAI
YES NO
YES NO
YES NO
SINGLE NO PAT
E/R/A/P/F
E/R/U
STEREO PB MONO
YES NO
YES NO
YES NO
YES NO
YES NO
YES NO
YES NO
YES NO
YES NO
Table 1
MULTI
NO
NO
NO
NO
E/R/A/P/F
---
MONO
NO
NO
YES
NO
NO
NO
NO
NO
NO
SINGLE
---
TRIPLE
NO
---
E/R/U
NO
(No.YA124)1-11
SETTING OF BASIC FUNCTIONS
Setting itemSetting value
POWEROff
SUB POWEROn
VOLUME15
COLOR SYSTEMPAL
SOUND SYSTEMB/G
PICTURE MODE (VSM)BRIGHT
OFF TIMEROFF
CHANNEL POSITIONPR1
Table 2
SETTING OF MENU SCREEN
Setting itemSetting value
INPUTTV
VNRAUTO
AUTO SHUTOFFOFF
CHILD LOCKOFF
BLUE BACKON
AUTO PROGRAM
EDIT / MANUAL
LANGUAGEENG
TEXT LANGUAGEGROUP-4 [AV-21CMT4/G]
TINTCentre
COLOURCentre
BRIGHTCentre
CONTMaximum
SHARPCentre
AI VOLUMEON
FAVORITE CH REDPR01
FAVORITE CH GREENPR02
FAVORITE CH YELLOW PR03
FAVORITE CH BLUEPR04
Refer to OPERATIN G INSTRUCTIONS
Refer to OPERATIN G INSTRUCTIONS
Table 3
SERVICE MENU SETTING ITEMS
Setting itemSetting value
1. IF1. VCO
2. DELAY POINT
2. V/C1. SCREEN DATA
2. CUTOFF(B/G)
3. WDR(R/G/B)
4. BRIGHT(TV/VDO 1/2)
5. CONT(TV/VDO 1/2)
6. COLOUR(TV/VDO1/2)
7. TINT(TV/VDO 1/2)
8. SHARP [Do not adjust]
9. Y DELAY [Do not adjust]
10. TINT DVD [Do not adjust]
11. AMP T. SHARP
3. AUDIO
[Do not adjust]
4. DEF1. V-SHIFT
5. VSM W/B
(BRIGHT/STANDARD/SOFT)
(COOL/WARM/NORMAL)
6. STATUS
[Display only]
7. PLUG & PLAY(ON)
[Display only]
1. DCXO ADJ
2. NICAM lower ERRLIM
3. NICAM upper ERRLIM
4. A2 ID THR
5. MENU EQUALIZER
2. V-SLOPE
3. V-SIZE
4. H-CENT
5. H-SIZE
6. TRAPEZ
7. EW-PIN
8. COR-UP
9. COR-LO
10. ANGLE
11. BOW
12. V-S.CR
13. V-LIN
14. V-ZOOM
15. V-SCROLL
1. BRIGHT
2. CONT
3. COLOUR
4. SHARP
5. HUE
1. R DRIVE
2. G DRIVE
3. B DRIVE
1-12 (No.YA124)
Table 4
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