Lg Rz-20la60 User manual

MONO

STEREO

DUAL

LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : ML-012B

MODEL : RT/RZ-20LA60

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

- 2 -

CONTENTS

CONTENTS .............................................................................................. 2

PRODUCT SAFETY ................................................................................. 3

DESCRIPTION OF CONTROLS .............................................................. 4

SPECIFICATION........................................................................................9

ADJUSTMENT INSTRUCTION................................................................11

TROUBLE SHOOTING............................................................................16

PRINTED CIRCUIT BOARD....................................................................17

BLOCK DIAGRAM...................................................................................20

EXPLODED VIEW .................................................................................. 22

EXPLODED VIEW PARTS LIST..............................................................23

REPLACEMENT PARTS LIST ............................................................... 24

- 3 -

PRODUCT SAFETY

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audiovisual service

technicians. When servicing this product, under no circumstances should the

original design be modified or altered without permission from LG Electronics

Inc. All components should be replaced only with types identical to those in the

original circuit and their physical location, wiring, and lead dress must conform

to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in

this TV receiver is blown, replace it only with the factory specified fuse type and

rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over

1W), keep the resistor 10mm away from PCB. Always keep wires away from

high voltage or high temperature parts.

Special components are also used to prevent shock and fire hazard.

These components are indicated by the letter “x” included in their component

designators and are required to maintain safe performance. No deviations are

allowed without prior approval by LG Electronis Inc. Service work should be

performed only after you are thoroughly familiar with these safety checks and

servicing guidelines.

Circuit diagrams may occasionally differ from the actual circuit used.

This way, implementation of the latest safety and performance improvement

changes into the set is not delayed until the new service literature is printed.

CAUTION: Do not attempt to modify this product in any way.

Never perform customized installations without manufacturer’s

approval.

Unauthorized modifications will not only void the warranty, but may

lead to property damage or user injury.

GENERAL GUIDANCE

An lsolation 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 to protect against personal injury from

electrical shocks. It will also protect the receiver and its components from being

damaged by accidental shorts of the circuitry that may be inadvertently

introduced during the service operation.

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’s 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 1MΩand 5.2MΩ. When

the exposed metal has no return path to the chassis the reading must be

infinite. Any other abnormality that exists must be corrected before

the receiver is returned to the customer.

ELECTROSTATICALLY SENSITIVE DEVICES

Some semiconductor (solid-state) devices can be damaged easily by static

electricity. Such components commonly are called Electrostatically Sensitive

(ES) Devices. Examples of typical ES devices are integrated circuits and some

field-effect transistors and semiconductor “chip” components. The following

techniques should be used to help reduce the incidence of component damage

caused by static electricity.

1. Immediately before handling any semiconductor component or

semiconductor-equipped assembly, drain off any electrostatic charge on the

body by touching a known earth ground. Alternatively, obtain and wear a

commercially available discharging wrist strap device, which should be

removed for potential shock reasons prior to applying power to the unit under

test.

2. After removing an electrical assembly equipped with ES devices, place the

assembly on a conductive surface such as an ESD mat, to prevent

electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices

not classified as “anti-static” can generate electrical charges sufficient to

damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charge

sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until

immediately before you are ready to install it. (Most replacement ES devices

are packaged with leads electrically shorted together by conductive foam,

aluminum foil, or comparable conductive material.)

7. Immediately before removing the protective material from the leads of a

replacement ES device, touch the protective material to the chassis or circuit

assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit, and observe

all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES

devices. (Otherwise, seemingly harmless motion, such as the brushing

together of your clothing or the lifting of your foot from a carpeted floor, can

generate static electricity sufficient to damage an ES device.)

DESCRIPTION OF CONTROLS

- 4 -

POWERMUTE

TV/AV I/II

LIST

VOL OK

123

456

789

SSM PSM

VOL

Q.VIEW MENU

SLEEP TEXT

UPDATE

TIME

SIZE MIX

HOLD

REVEAL

INDEX MODE

All the functions can be controlled with the remote control handset.

Some functions can also be adjusted with the buttons on the side

panel of the set.

Remote control handset

Before you use the remote control handset, please install the bat-

teries. See the next page.

1. MUTE

switches the sound on or off.

2. TV/AV

selects TV or AV mode.

clears the menu from the screen.

switches the set on from standby.

3. LIST

displays the programme table.

4. Q.VIEW

returns to the previously viewed programme.

5. DD / EE(Programme Up/Down)

selects a programme or a menu item.

switches the set on from standby.

FF / GG (Volume Up/Down)

adjusts the volume.

adjusts menu settings.

accepts your selection or displays the current mode.

6. NUMBER BUTTONS

switches the set on from standby and selects a programme.

7. SSM (Sound Status Memory)

recalls your preferred sound setting.

8. SLEEP

sets the sleep timer.

RZ model

- 5 -

9. POWER

switches the set on from standby or off to standby.

10. I/II

selects the language during dual language broadcast.

selects the sound output (option).

11. MENU

selects a menu.

12. PSM (Picture Status Memory)

recalls your preferred picture setting.

13. TELETEXT BUTTONS (option)

These buttons are used for teletext.

For further details, see the ‘Teletext’section.

*: No function

COLOURED BUTTONS

These buttons are used for teletext (only TELETEXT models) or

programme edit.

Battery installation

Note : To avoid damage from possible battery leakage, remove the

batteries if you do not plan to use the remote control handset for an

extended period of time.

POWERMUTE

TV/AV I/II

LIST

VOL OK

123

456

789

SSM PSM

VOL

Q.VIEW MENU

SLEEP TEXT

UPDATE

TIME

SIZE MIX

HOLD

REVEAL

INDEX MODE

The remote control handset is pow-

ered by two AAA/Alkaline type bat-

teries. To load the batteries, turn

the remote control handset over

and open the battery compartment.

Install two batteries as indicated by

the polarity symbols ( and )

marked inside the compartment.

RZ model

- 6 -

POWERMUTE

TV/AV

MULTIMEDIA

I/II

LIST

VOL

123

456

789

SSM PSM

VOL

EXIT MENU

SLEEP TEXT

UPDATE

TIME

SIZE MIX

HOLD

REVEAL

INDEX MODE

Q.VIEW

All the functions can be controlled with the remote control handset.

Some functions can also be adjusted with the buttons on the side

panel of the set.

Remote control handset

Before you use the remote control handset, please install the bat-

teries. See the next page.

1. MUTE

switches the sound on or off.

2. TV/AV

selects the remote operating mode.

clears the menu from the screen.

switches the set on from standby.

3. LIST

displays the programme table.

4. EXIT

clear all on-screen displays and returns to TV viewing from any

menu.

5. DD / EE(Programme Up/Down)

selects a programme or a menu item.

switches the set on from standby.

FF / GG (Volume Up/Down)

adjusts the volume.

adjusts menu settings.

accepts your selection or displays the current mode.

6. NUMBER BUTTONS

switches the set on from standby and selects a programme.

7. SSM (Sound Status Memory)

recalls your preferred sound setting.

8. SLEEP

sets the sleep timer.

9. Q.VIEW

returns to the previously viewed programme.

111

(With TELETEXT)

RT model

- 7 -

10. MULTIMEDIA

selects TV or Component mode.

switches the set on from standby.

11. POWER

switches the set on from standby or off to standby.

12 I/II

selects the language during dual language broadcast.

selects the sound output (option).

13 MENU

selects a menu.

14 PSM (Picture Status Memory)

recalls your preferred picture setting.

15 TELETEXT BUTTONS (option)

These buttons are used for teletext.

For further details, see the ‘Teletext’section.

*: No function

COLOURED BUTTONS

These buttons are used for teletext (only TELETEXT models) or

programme edit.

POWERMUTE

TV/AV

MULTIMEDIA

I/II

LIST

VOL

123

456

789

SSM PSM

VOL

EXIT MENU

SLEEP

Q.VIEW

111

(Without TELETEXT)

RT model

- 8 -

1. ON/OFF ( /I)

switches the set on from standby or off to

standby.

2. TV/AV

selects TV or AV mode.

clears the menu from the screen.

switches the set on from standby.

3. MENU

selects a menu.

4. OK

accepts your selection or displays the current

mode.

5. FF / GG (Volume Up/Down)

adjusts the volume.

adjusts menu settings.

6. DD / EE(Programme Up/Down)

selects a programme or a menu item.

switches the set on from standby.

7. REMOTE CONTROL SENSOR

8. LED (Light Emitting Diode) DISPLAY

illuminates brightly when the set is switched on.

: POWER/STANDBY indicator

: MONO indicator

: STEREO indicator

: DUAL indicator

9. HEADPHONE SOCKET

Connect the headphone plug to this socket.

10. AUDIO/VIDEO IN SOCKETS (AV3)

Connect the audio/video out sockets of exter-

nal equipment to these sockets.

S-VIDEO/AUDIO IN SOCKETS (S-Video)

Connect the video out socket of an S-VIDEO

VCR to the S-VIDEO socket.

Connects the audio out sockets of the S-

VIDEO VCR to the audio sockets as in AV3.

Side panel

MONO

STEREO

DUAL

S-VIDEOVIDEO

AUDIO

AV3

L / MONO

VOL

ON/OFF

/ I

7 8

MONO

STEREO

DUAL

- 9 -

1. Application range

This specification is applied to ML-012B/C chassis.

2. Requirement for Test

Testing for standard of each part must be followed in below

condition.

(1) Temperature: 25°C ± 5°C(But, CST must be tested 40°C ±

2°C (Humidity: 50%))

(2) Humidity: 65% ± 10%

(3) Power: Standard input voltage (AC 100-220V, 50/60Hz)

(4) Measurement must be performed after heat-run more than

15min.

(5) Adjusting standard for this chassis is followed a special

standard.

3. Test and Inspection method

(1) Capacity: Follow LG electronics TV Testing Standard.

(2) Another Required Standard

Follow the standard of each nation.

SPECIFICATION

NOTE : Specifications and others are subject to change without notice for improvement

4.General Specification

Receivable broadcasting system

RF input channel

Input voltage

Tuning system

Picture size

Operating temperature

Operating humidity

Storage temperature

Storage humidity

Display

D4 Jack

Specification

Min Typ Max Unit

1)PAL/SECAM-BG

2)PAL/SECAM-DK

3)PAL-I/I

4)SECAM-L/L’

5)NTSC -M

6)NTSC 4.43(AV)

7)PAL N/M

8)NTSC-M

VHF: E02 ~ E12

UHF : E21 ~ E69

CATV : S1 ~ S20

HYPER : S21 ~ S41

L/L’: B,C,D

VHF : 2 ~13

UHF : 14 ~ 69

CATV : 1 ~ 125

HYPER : S21 ~S41

V/UHF : 1 ~ 62

CATV : C13 ~ C38

AC 110 - 220V ± 10%, 50/60Hz

AC 230 - 240V/50Hz,AC 100V 50/60Hz

FVS 100 program

38.4cm

0 40 deg

20 80 %

-20 50 deg

30 85 %

LCD Module

1:Y, 3:Pb, 5:Pr, 7:Line1 Ready, 9:LINE2, 11:LINE3, 13:Line3 Ready

2:Y GND, 4:Pb GND, 6:Pr GND, 8:LINE1, 10:Line2 Ready,

12:SWITCH GND, 14:SWITCH

Item Remark

No.

EU/Non-EU

(PAL Market)

NTSC Market

PAL

FRANCE

NTSC

JAPAN

PAL, 200PR.(option)

NTSC

20.1”

LG-PHILPS

- 10 -

5. Feature and Function

Teletext

REMOCON

AV input

S-AV input

Component input

PERI TV Connector

RGB input

D-Sub Audio input

2 Carrier stereo

NICAM stereo

2 Carrier dual

NICAM dual

SSC(split screen) mode

MUP(Multi Picture Display) mode

Film mode

Noise reduction

Progressive scan

Motion detection

Dolby virtual

Swivel speaker

TOP,FLOF,LIST 10 page

RC-5 /NEC code(NTSC)

Full SCART : 1

BG, DK

BG, I, LL’

BG, DK

BG, I, LL’

Item Specification Remark

No.

TOP(option)

PAL/NTSC

Side & Rear

Side

Rear(option)

Rear(option,EU)

D-Sub 15 pin

(15 inch only)

Stereo(15 Inch only)

- 11 -

1. Application Object

This instruction is for the application to the LCD TV.

2. Notes

(1) This set uses an adapter, so connect the adapter and the

set correctly before adjustment.

(2) The adjustment must be performed under the correct

sequence.

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

25!5cC of temperature and 65!10% of relative humidity if

there is no specific designation.

(4) The input voltage of the receiver must keep 100~220V,

50/60Hz in adjusting.

(5) The set must be operated for 30 minutes preliminarily

before adjustment if there is no specific designation.

[‘Heat Run’must be performed with the full white signal or TV

noise signal in the internal part of the set.

[ The time for ‘Heat Run’can be changed owing to production

plan.

3. Component input mode adjustment

3-1. Required Test Equipment

(1) A pattern generator being in proportion to MSPG925LTH

(or 801F,SETTOP box)

(2) Adjustment Remote controller (SVC Remocon)

3-2. Preparation for Adjustment

(1) Perfome ‘Heat-run’for more than 20 minutes in the White

Pattern.

(2) Connect the signal of Pattern generator with component

input Jack(YPbPr) of LCD TV.

3-3. YPbPrAdjustment

(1) Apply the DTV 1080i,color bar pattern by using

MSPG925LTH. Or apply DTV 1080i color bar pattern of

Pattern generator.

(2) In SVC menu mode,operate YPbPr adjustment by using

Volume + button.

ADJUSTMENT INSTRUCTION

4. Option1 data(200PR~A2 ST:1bit,SYS:2bit)

- 12 -

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

SCART

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

SCART

- 13 -

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

100

101

102

103

104

105

106

107

108

109

SCART

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

SCART

- 14 -

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

SCART

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

SCART

- 15 -

OPTION

Data 200PR

TEXT

I/II SV TOP A2 ST SYS

248

249

250

251

252

253

254

255

SCART

5. Option2 data(ACMS~BBACK:1bit,LANG:3bit)

6. Option3 data(IIC AFT~CH+AU:1bit)

OPTION

Data ACMS VOL

HIDEV

OPTION

Data IIC AFT MD SAVE

MONO CH+AUS

- 16 -

8 No sound Defective Reset IC of IC603 1) Check volume and speaker

- Speaker Defective MSP3421 of IC601 - Sound comes out only when being inputted into Audio

- Earphone Defective B+(8V,5V) of IC604,605. L/R

2) Check after replacing IC603

3) Replace IC601

4) Check and replace B+ of IC604,605.

9 Video color beat noise Earphone shield case being touched

Check the mould of shield and JA2000, Replace shield case

Soldering IC301 and IC912 Re-soldering

1 No screen Input error of inverter connector 1) Bend the pin legs of P1 connector -> recheck them

2) Check and repair the IC804 SI4963,805 SI4925

Pin 40 connector 1) Check and fix P701 connector

being slipped out 2) Check and fix the components at P701 LCD module

and at main board.

3) Check Pin40.

Cracked components and 1) Check and repair tuner board and main board

soldering at tuner board 2) Solder 102.

2 Dark screen 1) Defective LCD lamp 1) Replace the inverter

2) Defective inverter 2) Replace the LCD lamp

3) Input error of inverter connector 2) Check the connector input.

TROUBLESHOOTING

1. General Features

No. Symptom Cause Check Point

Check Point

2. TV and external input

No. Symptom Cause

- 17 -

PRINTED CIRCUIT BOARD

MAIN(TOP)

- 18 -

MAIN BOARD(BOTTOM)

- 19 -

CONTROL BOARD

SIDE AV BOARD

LED BOARD

- 20 -

BLOCK DIAGRAM

P701

TTL

VPC3230D

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