LG 21FB5RL Schematic

COLOR TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : CW62B

MODEL: 21FB5RLX

MODEL: 21FB5RLX-ZV

website:http://biz.lgservice.com

Dec.,2006

Printed in ChinaP/NO : MFL31616402 c

ON/OFF

VOL PR

VIDEO

AUDIO

AV IN2

- 2 -

CONTENTS

Contents ....................................................................................................2

Safety Precautions....................................................................................3

Control Descriptions ................................................................................4

Specifications............................................................................................7

Adjustment Instructions...........................................................................8

SVC Remocon.........................................................................................13

Trouble Shooting....................................................................................14

Printed circuit board...............................................................................17

Block Diagram.........................................................................................18

Exploded View.........................................................................................20

Exploded View Parts List.......................................................................21

Replacement Parts List..........................................................................22

SVC. Sheet...................................................................................................

- 3 -

SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.

It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.

X-RAY Radiation

Warning:

To determine the presence of high voltage, use an accurate high impedance HV meter.

Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate

23.5 ± 1.5KV: 14-19 inch, 26 ± 1.5KV: 19-21 inch,

29.0 ± 1.5KV: 25-29 inch, 30.0 ± 1.5KV: 32 inch If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet. Do not use a line Isolation Transformer during this check. Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to

0.5mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued X-RAY RADIATION protection, the replacement tube must be the same type tube as specified in the Replacement Parts List.

IMPORTANT SAFETY NOTICE

0.15uF

AC Volt-meter

To Instrument’s exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

1.5 Kohm/10W

- 4 -

DESCRIPTION OF CONTROLS

All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set.

Remote control handset

Before you use the remote control handset, please install the batteries. See the next page.

1. POWER

switches the set on from standby or off to standby.

2. NUMBER BUTTONS

Switches the set on from standby or directly select a number.

3. MENU

selects a menu.

D / E

(Programme Up/Down)

selects a programme or a menu item. switches the set on from standby. scans programmes automatically.

F / G

(Volume Up/Down)

adjusts the volume. adjusts menu settings.

accepts your selection or displays the current mode.

5. TELETEXT BUTTONS (option)

These buttons are used for teletext. For further details, see the ‘Teletext’ section.

SLEEP

sets the sleep timer.

7. PIP BUTTONS (option) PIP

switches the sub picture on or off.

PR +/-

selects a programme for the sub picture.

SWAP

alternates between main and sub picture.

INPUT

selects the input mode for the sub picture.

SIZE

adjusts the sub picture size.

STILL

freezes motion of the sub picture.

POSITION

relocates the sub picture in clockwise direction.

(With TELETEXT / PIP)

VOL

Q.VIEW LIST

UPDATE/ HOLD/

(With TELETEXT / Without PIP)

- 5 -

8. FAVOURITE

selects a favorite programme.

EYE/*(option)

switches the eye function on or off.

10. MUTE

switches the sound on or off.

11. TV/AV

selects TV or AV mode. switches the set on from standby. exits the Teletext mode

(option)

12.

I/II/

selects the language during dual language broadcast. selects the sound output (option).

13. Q.VIEW (or SWAP)

returns to the previously viewed programme.

14.

LIST (or INPUT)

displays the programme table.

: No function

COLOURED BUTTONS : These buttons are used for teletext (only

TELETEXT models) or programme edit.

(Without TELETEXT / PIP)

VOL

(With PIP / Without TELETEXT)

VOL

Q.VIEW LIST

- 6 -

1. MAIN POWER (ON/OFF)

switches the set on or off.

2. POWER/STANDBY INDICATOR

illuminates brightly when the set is in standby mode. dims when the set is switched on.

3. REMOTE CONTROL SENSOR

Note : Only use the supplied remote control handset. (When you use others, they won’t be able to function.)

4. MENU (option)

selects a menu.

5. OK (option)

accepts your selection or displays the current mode.

FF / GG

(Volume Up/Down) (option)

adjusts the volume. adjusts menu settings.

DD / EE

(Programme Up/Down) (option)

selects a programme or a menu item. switches the set on from standby.

6. AUDIO (or AUDIO-L/R)/VIDEO IN SOCKETS (AV IN2) (option)

Connect the audio/video out sockets of external equipment to these sockets.

7. EYE (option)

adjusts picture according to the surrounding conditions.

Note : Shown is a simplified representation of front

or side panel. What is shown here may be somewhat different from your set or can not be supplied on your area.

Side panel

AUDIO

21FB5 series

2 3 4 5

VIDEO

VOL PR

ON/OFF

AV IN2

- 7 -

SPECIFICATIONS

Note : Specification and others are subject to change without notice for improvement.

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Scope

This specification can be applied to all the television related to CW62B Chassis.

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Test and Inspection Method

1) performance : Follow the Standard of LG TV test

2) Standards of Etc. requirement

- Safety: IEC60065

- EMC: EN55020,EN55013

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Test Condition

1) Temperature : 20 ± 5°C(CST : 40 ± 5°C)

2) Relative Humidity : 65

± 10%

3) Power voltage : AC110-240V~, 50/60Hz(Middle East/Africa) AC 230V~50/60Hz (EU/CIS)

4) Follow each drawing or spec for spec and performance of

parts,based upon P/N of B.O.M

5) Warm up TV set for more than 20min. before the

measurement.

4 5 6 7

Item

Receiving System

Available Channel

Input Voltage

Market Screen Size Tuning System Operating Environment

Storage Environment

Remark

EU/ Non EU

OPTION

Non EU/ EU

NTSC-M

Non EU

PAL 200 PR(W/O TXT)

Specification PAL,SECAM BG PAL/SECAM DK PAL-I/I NTSC M NTSC 4.43(AV) SECAM-L/L’ NTSC M/ PAL M/N VHF : E2 ~ E12 UHF : E21 ~ E69 CATV : S1 ~ S20 HYPER : S21 ~ S41 VHF : 02 ~ 13 UHF : 14 ~ 69 CATV : 02 ~ 71 AC 110-240V, 50/60Hz AC 230V, 50/60Hz EU,CIS, China, Asia, Africa,Middle East Flat 21” FVS 100Program

1) Temp : 0 ~ 45 deg

2) Humidity : below 85%

1) Temp : -20 ~ 60 deg

2) Humidity : below 85%

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General Specification

1. Application Object

These instructions are applied to all of the color TV, CW62B.

2. Notes

(1) Because this is not a hot chassis, it is not necessary to use

an isolation transformer. However, the use of isolation transformer will help protect test instrument.

(2) Adjustment must be done in the correct order.But the

adjustment can be changed by consideration of mass production.

(3) The adjustment must be performed in the circumstance of

25±5°C of temperature and 65±10% of relative humidity if there is no specific designation.

(4) The input AC voltage of the receiver must keep rating

voltage in adjusting.

(5) The receiver must be operated for about 20 minutes prior

to the adjustment.

(6) Signal: Received, the standard color signal.(65dB±1dB uV)

LG standard signal means the digital pattern (PAL_EU 05CH,NTSC_US 13CH).

3. Focus adjustment

(1) Receive the Cross-Hatch Pattern(Fig 1). (2) Set the picture condition on “DYNAMIC(CLEAR)” mode. (3) Adjust the Focus volume of FBT,made the focus of the 1/4

part vertical line is best.

4. Purity & Convergence adjustment

Adjustment should be operated when using the CPT(without ITC from CPT manufacturing place) This adjustment must be done in the order of the following flowchart.

4.1. Color purity adjustment

(1) It makes CPT or CABINET enough to demagnetization. (2) Receive the signal of red raster. (3) Unfasten DY and push DY to FUNNEL direction. (4) Make R-Land be centered as cross Purity Magnet. That

time, 4 & 6 pole magnet should keep free gauss status.

(5) Make uniform RED Raster as moving DY,Check there is

purity problem or not on R/G/B,white Raster. Then fix screw of DY. (At this time, be careful about inclination and DY should be fixed keeping horizontality.)

(6) Check the TV set in direction of EAST, WEST, SOUTH,

NORTH. Adjust with supporing MAGNET when adjustment is not operated.

4.2. Convergence adjustment

These adjustments should be operaed at the best condition of focus after finished purity adjustment.

(1) Receive the signal of cross hatch that BACK RASTER is

black.

(2) Adjust brightness so that there are 9 ~12 dots.

- 8 -

ADJUSTMENT INSTRUCTIONS

<Fig. 1> Cross-Hatch Pattern (NTSC : US 09CH, PAL : E-7CH)

Assembling DY to

CPT

CPT Assembling

As preparatory operations before assembling CPT, wind cotton Tape for protecting to CPT NECK and DY, CPT connection parts. At this moment, end of tape should be over-lapped and wound in direct route to the NECK.

Let the screen Standard condition. Operate Heat-Run at least 15 minutes.

Torque is to be 9-11 kg f.cm when fixing DY.

Fix the Magnet to the position as shown picture below. Be careful not to make CPT neck shadow while adjusting DY.

HEAT RUN

Degaussing

STC Pre-Adjustment

PURITY Adjustment

DY Fixing

SCREEN Voltage adj.

W/B Fixing

FOCUS not yet ADJ.

STC not yet ADJ.

DYC not yet ADJ.

Convergence Magnet

¢‚

15 ~ 20mm

6Pole

¢‚

(3) Widen two tabs of 4pole Magnet with equal angles and

accord red,blue vertical lines at the center of screen.

(4) With keeping angle of "c.clause",rotate tab and accord

red/blue,green vertical lines at the center of screen.

(5) Widen two tabs of 6pole Magnet with equal angles and

accord red,bllue vertical lines at the center of screen.

(6) With keeping angle of "e.clause",repeat the adjustment

from c to e keeping in mind the movement of red,blue,green when the horizontal lines are twisted.

(7) Move the DY up,down,left,right and make the convergence

to be optimal condition and stick rubber wedge to CPT so that the DY not to move.

5. Screen voltage adjustment

SCREEN manual adjust method(Used the remote controller) (1) RF Mode,input the PAL or SECAM(NTSC)singal,every

channel is OK.

(2) First LINE SVC MODE(IN-START KEY) and push the ADJ

KEY change to the SCREEN adjustment MODE.

(3) Adjust the SCREEN VOL of the FBT,then TV picture will

be have a horizontal line,manual adjust the FBT SCREEN VOL,when the horizontal line just disappear is OK (Press the TV/AV button to exit SVC mode)

6. White balance adjustment

(1) Receive 100% white pattern. (2) From the initial data,adjust BLO-R(R CUT),BLO-G(G CUT)

keep X,Y coordinate settle for the below list,adjust the LOW LIGHT(4.5FL).

(3) From the initial data:BG(B-DRIVE) is 32,adjust RG(R-

DRIVE),GG(G-DRIVE) keep X,Y coordinate settle for the below list,adjust the HIGH LIGHT(35FL).

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W/B adjust initial data maybe difference by different

model,so please refer to the model adjust TABLE.

7. Deflection setting Data Adjustment

7.1 Adjustment preparation

(1) TV set to receive an Digital pattern(PAL:E5ch.,NTSC: US-

12). (2) Deflection data setting used remote. (3) press the LINE SVC MODE(IN-START KEY) into

SERVICE MENU,Choice SERVICE2 to adjustment mode. (4) Press CH+,CH- KEY chooice adjust item. (5) Press VOL+,VOL - KEY increase or decrease DATA.

7.2 Adjustment

(1) First,adjust deflection at 50Hz,of PAL signal.

then,adjust deflection at 60Hz, of NTSC signal. (2) Korea Model only used the N60Hz,adjustment .

Adjust vertical inclination of screen. (3) Central or South America Model first N60Hz adjustment

and then N50(PAL-N) adjustment. (4) when finish the adjustment and press"ENTER" KEY,save

data andexit adjustment Mode.

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Deflection adjustment small item

(1) V SLOPE

The cutting part(below) of picture transfer to Blanking. Adjust the geometric vertical center of the CPT is in accord lower blanking.

(2) VS (Vertical Shift)

Adjust so that the horizontal center line of a digital circle pattern is in accord with geometric horizontal center of the CPT.

2. White balance IIC Parameter(Address)

Program Sub Add

Start Bit Stop Bit

Offset

Polarity

EP_Rom_S

B(R)_Amp

Win31_wb TWB

5 0 0 1

B(R)_Cut

Win31_wb TWB

5 0 0 1

G_Amp

Win31_wb TWB

5 0 0 0

- 9 -

Item EU N-EU

X Y

Chroma

288 295

9000

268 273

13000

<Table 1> White Balance Coordinate(By market)

BLO-R(R CUT) BLO-G(G CUT) BLO-B(B CUT) RG(R DRIVE) GG(G DRIVE) BG (B DRIVE)

LOW LIGHT

HIGH LIGHT

0 ~ 63 0 ~ 63 0 ~ 63 0 ~ 63 0 ~ 63 0 ~ 63

32 32 32 32 32 32

Range

DATA

<Table 2> White Balance Initial Data

<Table 3> White Balance Initial Data

1. IC PARAMETER

VCD IC

EP_ROM

0 0 0 0

Name

Maker Algorithm

Program

Vcd Slave

Win31_wb

TWB

Eeprom_Slave

Win31_wb

TWB

Speed1Delay

G_Cut

Win31_wb TWB

5 0 0 0

Speed/ Plus 2 2 2 2

PAL

NTSC

32 32 32 32 32 32

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