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- 3 -

SAFETY PRECAUTIONS

1.  Before returning an instrument to the customer, always make a safety

check of the entire instrument, including, but not limited to, the
following  items:

a. Be sure that no built-in protective devices are defective and/or have

been defeated during servicing. (1) Protective shields are provided on
this chassis to protect both the technician and the customer. Correctly
replace all missing protective shields, including any removed for
servicing convenience. (2) When reinstalling the chassis and/or other
assemblies in the cabinet, be sure to put back in place all protective
devices, including, but not limited to, nonmetallic control knobs,
insulating fishpapers, adjustment and compartment covers/shields, and
isolation resistor/capacitor networks. 

Do not operate this instrument

or permit it to be operated without all protective devices correctly
installed and functioning.

b. Be sure that there are no cabinet openings through which an adult or

child might be able to insert their fingers and contact a hazardous
voltage. Such openings include, but are not limited to, (1) spacing
between the picture tube and the cabinet back, (2) excessively wide
cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly
secured cabinet back cover.

c. 

Antenna Cold Check-

With the instrument AC plug removed from any

AC source, connect an electrical jumper across the two AC plug prongs.
Place the instrument AC switch in the on position. Connect one lead of
an ohmmeter to the AC plug prongs tied together and touch the other
ohmmeter lead in turn to each tuner antenna input exposed terminal
screw and, if applicable, to the coaxial connector. If the measured
resistance is less than 1.0 megohm or greater than 5.2 megohm, an
abnormality exists that must be corrected before the instrument is
returned to the customer. Repeat this test with the instrument AC
switch in the off position.

d.

Leakage Current Hot Check

-With the instrument completely

reassembled, plug the AC line cord directly into a 120 V AC outlet.
(Do not use an isolation transformer during this test.) Use a leakage
current tester or a metering system that complies with American
National Standards Institute (ANSI) C101.1 Leakage Current for
Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the
instrument AC switch first in the on position and then in the off position,
measure from a known earth ground (metal waterpipe, conduit, etc.) to
all exposed metal parts of the instrument (antennas, handle bracket,
metal cabinet, screwheads, metallic overlays, control shafts, etc.),
especially any exposed metal parts that offer an electrical return path to
the chassis. Any current measured must not exceed 0.5 milliamp.
Reverse the instrument power cord plug in the outlet and repeat the
test.

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN
INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE
CUSTOMER.

e. X-Radiation and High Voltage Limits-

Because the picture tube is the

primary potential source of X-radiation in solid-state TV receivers, it is
specially constructed to prohibit X-radiation emissions. For continued X-
radiation protection, the replacement picture tube must be the same
type as the original. Also, because the picture tube shields and mounting
hardware perform an X-radiation protection function, they must be
correctly in place.
High voltage must be measured each time servicing is done that
involves B+, horizontal deflection, or high voltage. Correct operation of
the X-radiation protection circuits also must be reconfirmed each time

they are serviced. (X-radiation protection circuits also may be called
"horizontal disable" or "hold-down.") Read and apply the high voltage
limits and, if the chassis is so equipped, the X-radiation protection circuit
specifications given on instrument labels and in the Product Safety & X-
radia

t

ion Warning note on the service data chassis schematic.

High voltage is maintained within specified limits by close-tolerance
safety-related components/adjustments in the high-voltage circuit.
If high voltage exceeds specified limits, check each component
specified on the chassis schematic and take corrective action.

2. Read and comply with all caution and safety-related notes on or inside

the receiver cabinet, on the receiver chassis, or on the picture tube.

3. 

Design Alteration Warning- 

Do not alter or add to the mechanical or

electrical design of this TV receiver. Design alterations and additions,
including, but not limited to, circuit modifications and the addition of
items such as auxiliary audio and/or video output connections, might
alter the safety  characteristics of this receiver and create a hazard to
the user. Any design alterations or additions will void the manufacturer's
warranty and will make you, the servicer responsible for personal injury
or property damage resulting therefrom.

4. 

Picture Tube Implosion Protection Warning-

The picture tube in this

receiver employs integral implosion protection. For continued implosion
protection, replace the picture tube only with one of the same type and
number. Do not remove, install, or otherwise handle the picture tube in
any manner without first putting on shatterproof goggles equipped with
side shields. People not so equipped must be kept safely away while
picture tubes are handled. Keep the picture tube away from your body.
Do not handle the picture tube by its neck. Some "in-line" picture tubes
are equipped with a permanently attached deflection yoke; because of
potential hazard, do not try to remove such "permanently attached"
yokes from the picture tube.

5. 

Hot Chassis Warning-a. 

Some TV receiver chassis are electrically

connected directly to one conductor of the AC power cord and may be
safely serviced without an isolation transformer only if the AC power
plug is inserted so that the chassis is connected to the ground side of
the AC power source. To confirm that the AC power plug is inserted
correctly, with an AC voltmeter measure between the chassis and a
known earth ground. If a voltage reading in excess of 1.0 V is obtained,
remove and reinsert the  AC power plug in the opposite polarity and
again measure the voltage potential between the chassis and a known
earth ground. 

b. 

Some TV receiver chassis normally have 85 V AC (RMS)

between chassis and earth ground regardless of the AC plug polarity.
These chassis can be safely serviced only with an isolation transformer
inserted in the power line between the receiver and the AC power
source, for both personnel and test equipment protection. 

c.

Some TV

receiver chassis have a secondary ground system in addition to the main
chassis ground. This secondary ground system is isolated from the AC
power line. The two ground systems are electrically separated by
insulating material that must not be defeated or altered.

6. Observe original lead dress. Take extra care to assure correct lead

dress in the following areas: 

a.

near sharp edges, 

b.

near thermally hot

parts- be sure that leads and components do not touch, 

c. 

the AC

supply, 

d. 

high voltage,  and 

e.

antenna wiring. Always inspect in all areas

for pinched, out-of-place, or frayed wiring. Do not change spacing
between components, and between components and the printed circuit
board. Check the AC power cord for damage.

7. Components, parts, and/or wiring that appear to have overheated or are

otherwise damaged should be replaced with components, parts, or
wiring that meet original specifications. Additionally, determine the
cause of overheating and/or damage and, if necessary, take corrective
action to remove any potential safety hazard.

8.

PRODUCT SAFETY NOTICE

Some electrical and mechanical parts have special safety related
characteristics which are often not evident from visual inspection, nor can
the protection they give necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts that have
special safety characteristics are identified by shading, by a 

¡ ,

or by        

on schematics and parts lists. Use of a substitute replacement that does

not have the same safety characteristics as the recommended
replacement parts might create shock, fire, and/or other hazards. Product
safety is under review continuously and new instructions are issued
whenever appropriate. 

DEVICE

UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2

-

WIRE CORD

ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)

EARTH
GROUND

LEAKAGE
CURRENT
TESTER

(READING SHOULD

NOT BE  ABOVE

0.5mA)

+ -

AC Leakage Test

Summary of Contents for RN-21FD10T

Page 1: ...ERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS SC 023A MODEL RP 21FD10 RN 21FD10T website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ... carrier frequency 42 17 MHz Center frequency 44 MHz CHASSIS CONSTRUCTION IC Solid state chassis PICTURE TUBE Type No A51QDJ279X SOUND OUTPUT 3W 3W CABINET Plastic ABBREVIATIONS Used in this book ADJ Adjustment or Adjust AFC Automatic Frequency Control AGC Automatic Gain Control AMP Amplifier CRT Cathode Ray Tube DEF Deflection DET Detector FBT Flyback Transformer H V High Voltage OSC Oscillator S...

Page 3: ...d on the chassis schematic and take corrective action 2 Read and comply with all caution and safety related notes on or inside the receiver cabinet on the receiver chassis or on the picture tube 3 Design Alteration Warning Do not alter or add to the mechanical or electrical design of this TV receiver Design alterations and additions including but not limited to circuit modifications and the additi...

Page 4: ...T 0 4 2 Adjustment 1 Press ADJ or SVC button on the remote control to make one horizontal line 2 Turn the Screen volume not to see one horizontal line and turn oppositely until it starts to display 5 Purity and Convergence Adjustment 5 1 Purity Adjustment 1 Preliminary steps 1 Receive Red Raster Pattern 2 Degauss CPT and Cabinet with degaussing coil 2 Horizontal Line Adjustment 1 Pre adjust Static...

Page 5: ...with the white balance meter 7 Focus Voltage Adjustment Adjust after operating the receiver enough 7 1 Preliminary steps 1 Receive Digital Pattern 2 Set Picture condition to CLEAR 7 2 Adjustment Adjust center focus with upper Focus volume and adjust corner focus with lower Focus volume Repeatedly adjust focus until getting proper focus 8 Sub Brightness Adjustment Do white balance adjustment first ...

Page 6: ... 7 S 8 S 9 S 10 S 11 S 12 S 13 S 14 S 15 S 16 S 17 S 18 S 19 S 20 S 21 S 22 S 23 S 24 S 25 S 26 S 27 S 28 S 29 S 30 S 31 Adjustment AGC Voltage Adj Horizontal Postilion Vertical Position Vertical SIZE R CUT OFF G CUT OFF B CUT OFF Inside TEST Pattern Range 0 63 0 31 0 7 0 63 0 255 0 255 0 255 0 127 0 127 0 63 0 15 0 15 0 3 0 3 0 1 0 1 0 3 0 7 0 1 0 1 0 1 0 3 0 3 0 7 0 3 0 1 0 1 0 1 0 1 0 1 0 70 OS...

Page 7: ... BPT TOF V AGC V R BIA SYN SEP VOL ATT OVER MOD OSD POSITION Initial setting 50 15 3 40 128 128 128 64 64 36 9 3 0 3 1 1 1 3 0 0 0 3 2 1 0 1 0 1 0 86 0 17 Remark Necessary Necessary Necessary Necessary Necessary Necessary Necessary Necessary Necessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unne...

Page 8: ... 8 EXPLODED VIEW 913 170 150 112 153 510 400 174 504 500 300 120 600 310 320 330 ...

Page 9: ...T ASSEMBLY LGETT 310 5020V00893A BUTTON CONTROL RT 21FD10 ABS HF 380 6KEY 320 320 062E SPRING KNOB 330 5020V00873A BUTTON POWER RT 29FB70 ABS 1KEY 400 3809V00471C BACK COVER ASSEMBLY RP 21FD10 DVD 1PHONE IN CM 3809V00471B BACK COVER ASSEMBLY LGETT 500 3141VMNN22K CHASSIS ASSEMBLY MAIN SC023A 21F ST F EAR DVD 11P PUSH FD10 LGEIN 3141VMNS61B CHASSIS ASSEMBLY MAIN SC023A LGETT 504 351 009A LINK POWER...

Page 10: ... IC601 IC603 IC604 IC621 IC661 IC662 IC801 IC802 IC803 IC804 IC805 Q10 Q101 Q102 Q12 Q13 Q16 Q191 Q192 Q220 Q241 Q301 Q401 Q402 Q403 Q504 Q621 Q671 Q672 Q901 Q902 Q903 Q904 D22 D23 D301 0IMCRAL011A 0IFA754207A 0IKE780500P 0ISA795600A 0IPRPSA006A 0ICTMTO001C 0ICTMTO010A 0ISG726600A 0ISA722200A 0IFA754207A 0ISG200600A 0IMCRMN013A 0IFA753307A 0ILI817000G 0ILI817000G 0ISK665413C 0ISS781200H 0ISK110000...

Page 11: ... NO PART NO DESCRIPTION C316 C4 C40 C401 C403 C404 C406 C407 C408 C409 C412 C413 C414 C417 C5 C50 C502 C503 C506 C51 C511 C512 C513 C514 C517 C523 C524 C54 C540 C552 C56 C601 C602 C603 C605 C606 C607 C611 C612 C621 C622 C623 C624 C625 C626 C627 C628 C661 181 007H 0CE107DD618 0CE107DD618 0CQ8221N519 0CE474DK618 0CK4710W515 0CE107DF618 0CE106DH618 0CE225DP618 0CE227DD618 181 013V 181 013P 0CK2220W51...

Page 12: ... K B TS 100U SHL 160V M LOCA NO PART NO DESCRIPTION C837 C850 C901 C902 C904 C907 C908 JA01 JA1201 JA1202 J818 L1 L102 L104 L201 L202 L3 L401 L402 L662 L802 L901 T402 T403 T801 FR301 FR401 FR403 FR501 FR805 FR816 J510 J627 J628 J671 J674 R1 R100 R101 R102 R103 R104 0CK10201515 0CE108DF618 0CE475DR618 0CN3310K519 0CN2210K519 0CN3310K519 0CK12202510 6612VJH023A 6612VJH004D 6613V00004B 6613V00004M 38...

Page 13: ...CA NO PART NO DESCRIPTION R25 R254 R255 R256 R26 R28 R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R315 R316 R37 R38 R39 R401 R402 R403 R404 R405 R406 R407 R408 R409 R410 R412 R413 R414 R416 R418 R420 R421 R423 R48 R501 R502 R503 R504 R505 R506 R507 R508 0RD4701F609 0RD0752F609 0RD2203F609 0RD2203F609 0RD1002F609 0RD4701F609 0RN4700F409 0RD1001H609 0RD0561H609 0RD0471H609 0RD0561H609...

Page 14: ...CRIPTION R821 R822 R824 R825 R826 R827 R828 R83 R881 R882 R884 R885 R902 R904 R905 R906 R908 R912 R913 R915 R916 R917 R918 R919 R92 R920 R921 R922 R923 SW2 SW3 SW4 SW5 SW6 SW7 SW801 SW802 FB801 FB802 FB803 FB805 FB806 T802 X1 X661 Z102 Z201 180 A03Q 0RS5602K607 0RD4701F609 0RD1001F609 180 A01D 0RS5602K607 0RKZVTA001K 0RD1501F609 0RD1500H609 0RD2001F609 0RD1201F609 0RD2201F609 0RD1004H609 0RD1501F6...

Page 15: ...MM REMOTE CONTROLLER RECEIVER 38KHZ SOCKET CPT PCS030A 8PIN 14 360 THERMISTOR PTC J503P84D140M290Q 20 TUNER TAEUH001F LG NTSC VARISTOR TVR621D14A 620V 10 MANUAL OWNERS LGECM MANUAL OWNERS LGETT REMOTE CONTROLLER SC023A W EYE REMOTE CONTROLLER LGETT ANTENNA 3SECTION 750MM NTSC ANTENNA 3SECTION 750MM LGETT ADAPTER RF UGCOM 1 5KV 5mA LOCA NO PART NO DESCRIPTION For Capacitor Resistors the charactors ...

Page 16: ... B4 J508 B3 J509 B4 J510 C4 J511 C4 J512 C5 J513 C5 J514 D5 J515 C3 J601 E1 J602 E1 J603 B2 J604 B2 J605 B2 J606 B2 J607 B2 J608 B2 J609 B2 J610 A3 J611 A3 J612 A2 J613 A2 J614 A2 J615 A2 J616 A2 J617 A2 J618 B2 J619 A3 J620 A4 J621 A4 J622 A4 J623 B4 J624 B4 J625 B4 J626 A4 J627 B4 J628 B4 J629 B4 J630 B4 J631 A3 J632 A4 J633 A2 J634 B2 J635 B2 J636 B2 J637 B2 J661 C2 J662 C1 J663 D3 J664 D3 J665...

Page 17: ......

Page 18: ...May 2004 Printed in Korea P NO 3828VD0189A ...

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