In the interests of user safety (Required by safety regulations in some countries) the set should be restored to its original
condition and only parts indentical to those specified should be used.
CONTENTS
IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................................... 1-1
LOCATION OF USER’S CONTROL ...................................................................................................................... 2-1
INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................................. 3-1
SERVICE MODE ..................................................................................................................................................... 4-1
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
21G-FX10L
TV21G-FX10LService Manual21G-FX10LMarketE
CHAPTER 1. IMPORTANT SERVICE SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock
hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems
which are separated by insulating material. The nonisolated (hot) ground system is for the B+ voltage
regulator circuit and the horizontal output circuit. The
isolated ground system is for the low B+ DC voltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system,
remove the static charge by connecting a
10k ohm resistor in series with an insulated
wire (such as a test probe) between the picture tube ground and the anode lead. (AC
line cord should be disconnected from AC
outlet.)
1. Picture tube in this receiver employs integral
implosion protection.
2. Replace with tube of the same type number for
continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing
shatterproof goggles and after discharging the high
voltage anode completely.
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the
procedures and instructions covering X-radiation.
The only potential source of X-ray in current solid
state TV receivers is the picture tube. However, the
picture tube does not emit measurable X-Ray
radiation, if the high voltage is as specified in the
"High Voltage Check" instructions.
It is only when high voltage is excessive that Xradiation is capable of penetrating the shell of the
picture tube including the lead in the glass material.
The important precaution is to keep the high voltage
below the maximum level specified.
2. It is essential that servicemen have available at all
times an accurate high voltage meter.
The calibration of this meter should be checked
periodically.
3. High voltage should always be kept at the rated value
−no higher. Operation at higher voltages may cause
a failure of the picture tube or high voltage circuitry
and;also, under certain conditions, may produce
radiation in exceeding of desirable levels.
4. When the high voltage regulator is operating properly
there is no possibility of an X-radiation problem.
Every time a color chassis is serviced, the brightness
should be tested while monitoring the high voltage
with a meter to be certain that the high voltage does
not exceed the specified value and that it is regulating
correctly.
5. Do not use a picture tube other than that specified
or make unrecommended circuit modifications to the
high voltage circuitry.
6. When trouble shooting and taking test
measurements on a receiver with excessive high
voltage, avoid being unnecessarily close to the
receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
1 – 1
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
•
Plug the AC cord directly into a 110~220 volt AC
outlet, (Do not use an isolation transformer for this
test).
•
Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15μF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as electrical conduit or electrical
ground connected to earth ground.
•
Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
21G-FX10L
•
Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
AII checks must be repeated with the AC line cord
plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the
purpose of completing these check.)
Any current measured must not exceed 0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.
DVM
AC SCALE
1.5k ohm
10W
SAFETY NOTICE
Many electr ical and mechanical parts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by "
and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
TO EXPOSED
METAL PARTS
For continued protection, replacement parts must be
identical to those used in the or iginal circuit. The use of
substitute replacement parts which do not have the same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
"
CONNECT TO
KNOWN EARTH
GROUND
1 – 2
21G-FX10L
TV21G-FX10LService Manual21G-FX10LMarketE
CHAPTER 2. LOCATION OF USER'S CONTROL
[1] LOCATION OF USER'S CONTROL
AV
a
AV
AV
AV
a
2 – 1
TV21G-FX10LService Manual21G-FX10LMarketE
CHAPTER 3. INSTALLATION AND SERVICE INSTRUCTIONS
INSTALLATION AND SERVICE INSTRUCTIONS
Note:(1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes.
21G-FX10L
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1. Apply 110~220V AC using a variac transformer for
accurate input voltage.
2. Allow for warm up and adjust all customer controls
for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to C602 +ve and make
sure that the voltmeter reads 20 ±1.1V.
5. Apply external 28.5V DC at C602 +ve by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and make
a shor t circuit between C602 -ve and C602 +ve.
Now make sure that normal picture appears on the
screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 110~220V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3. Enter the service mode and set Y-mute ON by using
Service R/C.
4. The voltage should be approximately 26kV (at zero
beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the voltage test,
make Y-mute off to the normal mode.
3 – 1
21G-FX10L
TV21G-FX10LService Manual21G-FX10LMarketE
CHAPTER 4. SERVICE MODE
1. Service mode is switched by SERVICE key, CH UP + VOL DOWN when reset.
2. Service mode is c ancelled by SERVICE key during Service mode.
3. Service mode can be switched to the following 5 modes via MENU k ey:
SERVICE MODE
Adjustment mode
Setting mode
Confirmation mode
Option mode
NVM Edit mode
4䋮During Service mode, AFT operation is prohibited. The setting data for PLL is always set to fo data.
5䋮During Service mode, the following user data are set to default value and stored as last memory.
PICTURE䋯TINT䋯COLOR䋯BRIGHT䋯SHARP䋯COLOR TEMP.
BASS䋯TREBLE䋯BALANCE䋯MTS䋯FAO䋯SPEAKER䋯ENERG Y SAVE
6䋮During Service mode, OSD display for ON/OFF is toggled via [CH CALL] key.
䊶At display OFF condition, if changing adjustment data, channel, input source, it remains display OFF.
䊶At display OFF condition, if changing adjustment item, it returns to display ON.
7䋮During Service mode, the following operation are prohibited.
CLOSED CAPTION䋯No si gnal BLUE SCREEN
8䋮During Service mode, sound is muted(only MTSIC) except when selecting the following items.
V24, M01
First mode of service when entering by
SERVICE key.
First mode of service when entering by
2 local keys.
4 – 1
21G-FX10L
(
g
(
(
AUTO ADJUSTMENT
H-VCO
1. When there is H-VCO auto adjustment key input at item
2. H-FREE (1chip) is set to 1.
3. H-OUT (1chip) is set by intelligent monitor output.
4. IM input becomes TIM input.
5. H-VCO (1chip) data is changed so that the number is 126 inside 8ms interval.
6. When adjustment is completed, OSD display and H-VCO auto adjustment data of EERPOM are updated.
7. H-FREE
1chip), intelligent monitor output, IM input mode are recovered.
H-VCO, auto adjustment will be implemented.
RF-AGC
1. If there is RF-AGC auto adjustment key input at item RF-AGC, auto adjustment will be implemented.
2. AGC-OUT (MONITOR(1chip)is set by intelligent monitor output.
3. IM input becomes AD input.
4. RF-AGC(1chip) is decreased from current RF-AGC value to 0, the maximum AFT input voltage is obtained.
5. RF-AGC(1chip) is increased until at the point of AFT input voltage is (max. 0.3V), adjustment is completed.
6. When adjustment is completed, OSD display and RFGC auto adjustment status in EEPROM are updated.
7. Intelli
ent monitor output, IM input mode are recovered.
PIF-VCO
1. If there is PIF-VCO auto adjustment key input at item PIF- VCO, auto adjustment will be implemented.
2. VIF-DEF (1chip) is set to 1.
3. AFT output (1chip) is set by intelligent monitor output.
4. IM input becomes AD input.
5. VIF-VCO (1chip) is changed so the input voltage becomes 2.5V.
6. When adjustment is completed, OSD display and PIF-VCO auto adjustment status in EEPROM are updated.
7. VIF-DEF
1chip)intelligent monitor output, IM input mode are recovered.
S-TRAP
1. If there is S-TRAP auto adjustment key input at item S-TRAP, auto adjustment will be implemented.
2. S-TRAP OUTPUT is set by intelligent monitor output.
3. IM input becomes AD input.
4. S-Trap (1chip) is set to the value of V45(S-TRAP ADJ Start).
5. S_Trap_Result is set to the value of V45(S-TRAP ADJ Start).
6. S-Trap (1chip) is increased until the minimum input voltage becomes minimum.
7. Wait 20ms before sampling the new_ AD_data.
8. When adjustment is completed, OSD display and S-TRAP auto adjustment status in EEPROM are updated.
9. S-TRAP
1chip)intelligent monitor output, IM input mode are recovered.
4 – 2
g
g
TV21G-FX10LService Manual21G-FX10LMarketE
CHAPTER 5. ADJUSTMENT METHOD
Memory Map Data
Caution: Toget into the service mode, one of the ways is press direct keyfor service items.
There is three stage of Service Mode data
First sta
to go into second stage of service mode data, press MENU key
e data from V01 ~ M01
21G-FX10L
Second sta
to go into third stage of service mode data, press MENU key
0 : without COMPONENT
1 : COMPONENT (share with AV1)
2 : COMPONENT (individual)
0 : Without Sound Menu
1 : TONE
2 : EQUALIZER
3 : Without Sound Menu (GA8P)
0 : Standby Mode
1:LastMemory
0:NoSetUp
1 : AUTO Set Up
(2) Press RESET to set Picture N
(3) Adjust the focus control to get the bes
nservicemode. Adjust the V09busdatatoobtain theTuner
outputpindrop 0.1V b
ge the antenna inpu
n
a
e.
onois
n
s
i
rn uptheinput s
u
modulationbeat.
U
S4 CH
ignal to 9
ION HEAD Signal
L
ake sure TV Set is in "NORMAL CONDITION" b
ADJUSTMENT CONDIT
oJA402(Tuner's AGC Terminal) as shown in
t
e
cop
SCOPE
BIAS BOX
-1
Fig. 3
elow maximum voltage.
signal to 63 ~67dBμV, and makes
t
~95dBμVto be sure that the
0
ADJUSTMENT
ORMAL condition.
ar" signal
CO
(NTSC 60 Hz).
focusing.
t
.
JA
SET
V
T
NDITION / PROCEDU
ION/PROCEDU
402
re
re the
u
o cross
n
s
re i
stment.
Mode for Adj
fore switch t
e
E
R
R
o Service
for Auto ADJ
*
1)Receive "NTSC C
gnal strength :56±1dBμV(75ohmo
i
s
1) Go to s
to servic
2) Go
"Auto-AGC" key and confirm the OK display
on the screen
)Ifappear red display w
3
ep and pleas
t
s
4) Proceedstep4&5in
u
WAVEFORM OR OTHERS
UR BAR"
O
L
O
ervice mode.
data V09 , press R/C to operate
e
th NG s
i
e repeat step 2.
manual
FORM OR REMARK
WAVE
nal
sig
en).
p
rease data some
gn, inc
i
.
mode
Focusing Point(middle
of ce
monoscope pattern)
ter andedgeof
n
H-VCO, VIF-VCO & S-TRAP fo ADJUSTMENT
NO
ADJUSTMENT POINT
1 H-VCO ADJ
(I2C BUS CONTROL)
(AUTO & MANUAL ADJ)
2 VIF-VCO ADJ
(I2C BUS CONTROL)
(AUTO & MANUAL ADJ)
3
S-TRAP fo ADJ
(I2C BUS CONTROL)(1) In No signal (RASTER) condition.
(AUTO & MANUAL ADJ)
(Manual Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data
(3) Connect oscilloscope to IC801 pin13 (H-OUT)
become 15.735 ± 0.2KHz.
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode.
(3) Choose service data V25,bypressingR/C
at screen.
(4) If appear "NG" pls repeat step 3.
(Manual Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V14
(3) Connect oscilloscope to IC801 pin7 (AFT)
2.5 ± 0.5 V DC (Checking spec : 2.50 ± 1.5 V)
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V14.
(3) Press the R/C "AUTO PIF-VCO"
(4) If appear "NG" pls repeat step 3.
(Manual ADJ
(2) Go to service mode, choose service data V26.
(3) Connect oscilloscope to TP 801 or IC801 pin 30
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data
(3) Press the R/C "AUTO S-TRAP" key, OSD will appear "OK" at screen.
(4) If appear "NG" pls repeat step 3.
)
ADJUSTMENT CONDITION / PROCEDURE
V25.
,adjV25 until freq
"AUTO H-VCO" key, OSD will appear "OK"
, adj V14 until voltage become
key, OSD will appear "OK" at screen.
, adj V26 until voltage become Min (below 5 V).
V26.
WAVEFORM OR OTHERS
*NOTE:
This adjustment must be done after aging
at least 3 minutes.
5 – 6
21G-FX10L
HORIZONTAL ,V
NO
1
E
A
DJUSTMENT POINT
V-SHIFT
(I2C BUS CONTROL)
2
V-SIZE
(I2C BUS CONTROL)
(to be done after V-shift adj)
3
V-LINEARITY
(I2C BUS CONTRO
4
VS CORRECTION
(I2C BUS CONTR
5H-SHIFT
(I2C BUS CONTRO
6H-SIZE
(I
2C BUS CO
RTICAL,DEFLECTION LOOP ADJUSTMENT (1)
ADJUSTMENT CO
(1) Receive US4 CH LION HEAD Signal (NTSC 60 Hz)
(2) Choose the service data
(3) Adjust V
07
Note: B lin
e (Monoscope middle line) m
to the A mark (Tubem
(1) Receive US4 CH L
(
2) Choose the service data
(3) Adjust
V10
Caution 1: Pls ag
V07
.
to align the center of the screen to the geometric center of CRT.
iddle mark),refer t
I
O
NHEADSignal (NTSC 60 Hz
V10
.
bus data until the overscan become
ing TV more th
(1) Receive US4 CH LION HEAD Signal (NTSC 60 Hz).
L)
(2) Choose the servic
edata
V
29.
(3 )Already preset. (Adjust this unless the linearity is achieved.)
(1) Receiv
O
L)
e US4 CH LION HEAD Signal (NTSC 60 Hz).
(2) Choose the servic
e data
V27.
(3 )Already preset. (Adjust this unless the linearity is achieved.)
(1) Receiv
L)
NTROL)
e US4 CH LION HEAD Signal (NTSC 60 Hz
(2) Choose the service da
(3) Adjust the
(4)Ifcannotmakeitto
(1) Receive US
(2) Choose the service data
(
3) Adjust
V35 bus data until the overscan becomes
ta
V08 bu
s data t
oh
A=B
4CHLIONHEA
V08
ave a balance posi
, adjust fr
V35
.
D Signal (NTS
NDITION / PROCEDUR
.
u
st sam
eornearesthigher
o the attach drawing.
).
10 ± 2.5%.
an 10 minutes before adjustment
).
tion to spec of
o
mthebe
A=B
st point so that
A slightly smaller than
C60Hz).
10 ± 2.5 %.
(as attach
position
drawing).
E
Figure
W
AVEFORM OR OTHERS
A
OK
OKNG
B
AB
B
.
7
PARABOLA
(I2C BUS CON
(1) Receive CrossHatch Pattern Signal (NTSC 60 Hz).
TROL)
(2) Choose the service data
V31
Adjust the 2nd vertical line from the right end of the crosshatch pattern
so that the middle 4 blocks are straight.
(3) Ma
ke sure both left / right of 2nd vertical line at optimum point
5 – 7
21G-FX10L
H-BOW
HORIZONTAL ,VERTICAL,DEFLECTION
NO
ADJUSTMENT POINT
8
UPPER
C
ORNER
(I2C BUS CONTROL)
9
LOWER CORNER(1) Receive CrossHatch Pattern Signal (NTSC 60 Hz).
(I2C BUS CONTROL)(2) Choose the service data V39
10BOW-ADJ(1) Receive CrossHatch
(I2C BUS CONTROL)(2)Choose the service data V
11
ANGLE ADJ(1) Recei
(I2C BUS CONT
12TRAPEZIUM(1) R
(I2C BUS CONTROL)(2) Choose the service data
13FINAL INSPECTION OF (1) Receive CrossHatch Pattern Signal (NTSC 60
ADJUSTMENT(2) Please make sure picture distortion (ove
ROL)(2) Choose the service data V41
L
OOP ADJUSTMENT (2)
ADJUSTMENT CONDITION/PROCEDURE
(1) Receive CrossHatch Pattern Signal (NTSC 60 Hz).
(2) Choose t
he service data
(3) Adjust the 2nd upper
so that the upper line are straight.
(4)
M
ake sure both
(3) Adjust the 2nd lower vert
so that the bottom line ar
(4) Make sure both left / right of 2nd vertical line at opt
(3) Adjust the 2nd vertical line from the end of the crosshatch pattern until line is straight.
V37
vertical line from the right end of the
left / right of 2nd vertical line at opti
ical line from the right end of the crosshatch pattern
estraight.
Pattern Signal (NTSC 60 Hz).
43 BOW ADJ
ve CrossHatch Pattern Signal (NTSC 60 Hz).
(3) Adjust the 2nd vertical line from the end of the crosshatch pattern line is straight
(4) Make sure both left / right of 2nd vertical line at optimum point
eceive CrossHatch Pattern Signal (NTSC 60 Hz).
(3)
Adjust the 2nd vertical line from therightendofthe
so that the D1 (center area of the second vertical line and D2 (top area of the second vertical line - edge of screen) are same.
(4) Make sure both
TOP / BOTTOM at LEFT / RIGHT corner.
(3) If NG, please RE-ADJUST follow step 7 to 13 or adjust at NG
V33
left / right of 2nd vertical
mum point
imum point
crosshatch pattern
edge of screen)
line at optimum point
H
z).
rall picture
quality) must be
W
A
VEFORM OR OTHERS
crosshatch pattern
D2
D1
balance at optimum point
A
1
A2
D1
position to get best picture qualityA1B1 B
B1
B2
D2
A1 A2
~
~
~
~
~
C
1
~
D1
=
D2
D1
2
C
2
D2
C
1
O
VERA
LPICTURE
L
BALANCE AT OPTIMUM POI
&R
I
GHT )
Q
U
ALITY MUST BE
N
C2
T(LEFT
5 – 8
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