LG MT-40PA10S, R40PDP28, MZ-40PA10G, MT-40PA20S, MZ-40PA20G Service Manual

PDP MONITOR

SERVICE MANUAL

CAUTION

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

CHASSIS : MP-00MB

MODEL : MT/MZ-40PA10/G/S

MODEL : MT/MZ-40PA20/G/S
MODEL : R4018PDP
MODEL : R40PDP28

website:http://biz.LGservice.com

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

- 2 -

CONTENTS

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

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

Specifications ..................................................................................................... 4

Control Descriptions ........................................................................................ 5

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

Block Diagram .................................................................................................... 12

Wiring Diagram ................................................................................................. 14

Exploded View ............................................................................................ 16,18

Exploded View Parts List ........................................................................17,19

Replacement Parts List ............................................................................... 20

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 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
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 circuitary that may be
inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this monitor 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

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 positioin, 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 esposed 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 sepcified, 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

1.5 Kohm/10W

To Instrument's
exposed
METALLIC PARTS

Good Earth Ground
such as WATER PIPE,
CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

- 4 -

SPECIFICATIONS

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

O MONITOR

O Video receiving system:

PAL
SECAM
NTSC
VGA
SVGA

O Input Voltage : AC 110~240V, 50/60Hz

O Power consumption : Max 330W

Stand-By : 5W

O PDP Module : PDP40NVVDN4

O Speaker Impedance : 8 ohm

O Sound output : 20W max

O Feature : AV Input (Bottom)

Component Input (Bottom)
RGB Input (Bottom,D-Sub 15pin)
External SPK Out (Bottom,SPK Jack)
STB Control Input (Bottom)
STB Audio Input (D-Sub 25pin)

O Funtion : PSM

SSM
Child Lock
Auto Sleep

O External Interface

AV/COMPONENT Output

COMPONENT Mode ( Y,Cb/Pb,Cr/Pr)

OSET TOP BOX

O Video receiving system:

PAL-BG/DK/I
NTSC M

O Input Voltage : AC 110~250V, 50/60Hz

O Tuning System : FVS 100 Program

O Power consumption : Max 35W

Stand-By : 5W

O Available Channel : VHF : E2~E12(L/L’:B,C,D)

UHF : E21~E69
CATV : S1~S20(HYPER:S21~S41)

O Feature : AV In/out(RCA) : AV1(With RGB in/TV out)

AV In/out(RCA) : AV2(Monitor out)
AV In : AV3(Rear,CVBS)
S-Input : S-Input
Y,Pb,Pr Input : Component(Rear,480I,480P)
RGB Input : RGB-PC(Rear,D-Sub 15pin)
Audio-Input : Component/RGB- PC
RGB out : RGB-PC(Rear,D-Sub 15pin)
RGB out/Control :

PDP MNT connection:RGB,Control

AUDIO out :

PDP MNT connection:L,R(D-Sub 25pin)

Woofer out :

Woofer Speaker

O Funtion : PSM

SSM
Teletext
Auto Sleep

ITEM
AV Video out
AV SYNC out
AV Burst out
AV Audio Out

MIN

0.85

0.25

0.15

0.40

TYP

1.00

0.30

0.30

0.50

MAX

1.15

0.35

0.35

0.60

UNIT

Vpp
Vpp
Vpp

V

PIn Name

R
G
B

GND
H.Sync
V.Sync

STB-DET

SCL

SDA1 out

SDA1 in

SDA2 out

SDA2 in

Spec.

0.7Vpp

¡ 0.05

0.7Vpp¡ 0.05

0.7Vpp¡ 0.05

Case Common

4.0Vpp¡ 0.5

3.0Vpp¡ 0.5
High/Low

3.0~4.5Vpp

3.0~4.5Vpp

3.0~4.5Vpp

3.0~4.5Vpp

3.0~4.5Vpp

Pin

VSC-Det

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND

No.

13
14
15
16
17
18
19

20

21
22
23
24

REsolution

640*480
640*480
704*480

H-Freq(Khz)

15.73

15.63

31.47

V-Freq(hz)

60
50

59.94

Proposed
SDTV,DVD 480I
SDTV,DVD 480I

SDTV 480P

RGB/HV Control Signal In/Out(D-Sub 25pin Cable)

- 5 -

CONTROLS DESCRIPTION

ON/OFF

VOLUME

INPUT

SELECT

ON/OFF

INPUT

VOLUME

SELECT

<Front Panel>

MAIN POWER BUTTON

INPUT SELECT BUTTON

REMOTE CONTROL SENSOR

POWER/STANDBY INDICATOR

Illuminates red in standby
Illuminates green when the Monitor is switched on

POWER BUTTON

VOLUME (FF,GG) BUTTON

- 6 -

P

B R

Y P

(+) ( ) (+)( )

AC INPUT

EXTERNAL SPEAKER (8Ω)

AV INPUT

RGB-PC INPUT(VGA/SVGA)

R RL L R

AUDIO INPUT RGB INPUT/CONTROL

L

AUDIO

(MONO)

VIDEO

COMPONENT (480i/480p)

(DVD INPUT)

PBY

R

P

(+) ( ) (+)( )

AC INPUT

EXTERNAL SPEAKER (8Ω)

AV INPUT

(DVD INPUT)

COMPONENT (480i/480p)

RRL

L

R

AUDIO INPUT RGB INPUT/CONTROL

L

AUDIO VIDEO

(MONO)

RGB-PC INPUT(VGA/SVGA)

<Back Panel>

EXTERNAL
SPEAKER (8Ω)
KNOBS

AV INPUT /
COMPONENT (480i/480p)
DVD INPUT SOCKETS

RGB-PC INPUT (VGA/SVGA) /
AUDIO INPUT /
RGB INPUT/CONTROL SOCKETS

POWER INPUT
SOCKET

This Monitor operates
on an AC mains supply,
the voltage is as indicat­ed as inside back cover
of this manual. Never
apply DC power to the
Monitor.

- 7 -

AP-40/42WA20M

(Tilt wall mounting bracket)

AP-40/42WA10

(Wall mounting bracket)

MULTIMEDIA

ON/OFF

TV/VIDEO MENU ENTER

VOL CH

RT/RZ-BA10 (PDP Tuner)

Optional Extras

- Optional extras can be changed or modified for quality improvement without any notification new
optional extras can be added.

- Contract your dealer for buying these items.

AP-40/42CA10 (Ceiling mounting bracket)

AP-40/42FA10 (Floor type stand)

AP-40/42DA10 (Desktop stand)

AP-40/42SA10 (Speakers)

AP-40/42SA10D

(Speaker stand)

AP-40/42SA10F

(Floor type speaker stand)

Video cables

Audio cables

- 8 -

1. Application Object

These instructions are applied to all of the PDP monitor, MP­00MB.

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.
(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 voltage of the receiver must keep 220/230V,

50/60Hz in adjusting.
(5) The receiver must be operated for about 15 minutes prior

to the adjustment.

¤ After receiving 100% white pattern, the receiver must be

operate prior to adjustment.(Or white condition in HEAT­RUN mode)

¤ŁEnter into HEAT-RUN mode

- Select the HEAT-RUN OFF by pressing ADJ button on
Remote Control for adjustment.

- Press the VOL + button in HEAT-RUN OFF.

(OSD display HEAT-RUN WHITE and screen display
100% full WHITE PATTERN)

¤ØSet is activated HEAT-RUN without SET TOP BOX or

signal generator in this mode.

[ Single color pattern of HEAT-RUN mode uses to check

PANEL.(RED/BLUE/GREEN)

[Caution] If you turn on a still screen more than 20 minutes, a

afterinage may be occur in the black level part of the
screen.

3. POWER PCB Assy Voltage Adjustment

[ Replace PDP Module or Power Board, adjust certainly Power

PCB Assy Voltage.

3-1. Test Equipment

D.M.M 1EA

3-2. Connection Diagram for Measuring

Refer to Fig 1.

3-3. Adjustment Method

(1) Va Adjusment(Address Voltage Adjusment)

¤ Connect pin 1 of P806 or P811 to (+) jack of D.M.M.
¤ŁAfter turning the VR803(Va Adj), voltage of D.M.M

adjustment as same as Va voltage which on label of
panel right/bottom.(Deviation : ±0.5V)

(2) Vs Adjustment

¤ Connect pin 9 of P803 to (+) jack of D.M.M.
¤ŁAfter turning the VR804(Vs Adj), voltage of D.M.M

adjust as same as Vs voltage which indicated on label
of panel right/bottom.(Deviation : ±0.5V)

(3) VSC Adjustment

¤ Connect pin 4 of P802 to (+) jack of D.M.M.
¤ŁAfter turning the VR806(VSC Adj), voltage of D.M.M

adjust as same as Vs voltage which indicated on label
of panel right/bottom.(Deviation : ±0.5V)

(4) VSETUP Adjustment

¤ Connect pin 1 of P802 to (+) jack of D.M.M.
¤ŁAfter turning the VR805(VSETUP Adj),voltage of D.M.M

adjust as same as Vs voltage which indicated on label
of panel right/bottom.(Deviation : ±0.5V)

4. Adjustment of RGB Cut-off and
White Balance

4-1. Required Equipment

Color analyzer(CA-100 or same production)

4-2. Connection Diagram of Equipment for

Measuring

ADJUSTMENT INSTRUCTIONS

VSETUP

VR806
VR805
VR804

DMM

VSC

VA

VSC CTL

V

A CTL

P814

VR803

GND

V

SETUP CTL

V

S CTL

V

S

<Fig 1> Connection Diagram of Power Adjustment for Measuring

Refer to Typical Voltage

Va

Vs

Vsc

Vsetup

70V

182V

75V

225V

Address Voltage
Sustain Voltage
Scan Voltage
Setuo Voltage

COLOR

ANALYZER

TYPE; CA-100

Window Pattern

CVBS Signal Input

High Light

120±5cd/m2

Low Light
6±1cd/m2

PDP MONITOR

MSPG-2100 or
MSTG-5200

<Fig 2> Connection Diagram of Automatic Adjustment

- 9 -

4-3. Adjustment of RGB CUT OFF

(1) Select A/C SRT (cut-off automatic adjustment ) by

pressing SVC button on Remote Control for adjustment.
(2) Press the VOL + or VOL - button.
(3) It displayed all of the black on the screen and then

adjustment is started.
(4) If adjustment is finished, exit from adjustment mode by

pressing A/V button.

4-4. Adjustment of White Balance

• White Balance should be done after RGB cut-off become

adjustment.

• Operate the Zero-calibration of the CA—100, then stick

sensor to PDP module surface when you adjust.

(1) Select WHITE PATTERN of HEAT RUN mode by pressing

SVC button on Remote Control for adjustment then

operate HEAT RUN more than 15 minute.
(2) Supply window Signal in pattern generater.

[ When adjustment is operated manually, perate process (3)

to (6) regular sequence, when adjustment is operated

automatically perate process (1)~(2).

(3) To adjust Low Light, stick sensor to pattern(Dark), select

the R cut/B cuby pressing SVC button on Remote Control

for adjustment and adjust it until color coordination

becomes X=0.280±0.003, Y=0.310±0.003 and color

temperature becomes 8.800

cK ± 500cK by pressing VOL+,

- button. (G-cut fixation)

(4) To adjust High Light, stick sensor to pattern(White).

Select the R Gain/G Gain(adjustment 6) by pressing SVC

button on Remote Control for adjustment and adjust R

Gain/G Gain until color coordination becomes

X=0.280±0.003, Y=0.310±0.003 and color temperature

becomes 8.800cK ± 500cK.(B-Gain fixation)
(5) Confirm the result of the High Light adjustment.

If the deviation of High Light occur, operate the adjustment

of Low Light and High Light again.
(6) Exit adjustment mode using AV button.

5. Color Temperature of STB
White Balance Adjustment

5-1. Required Equipment

Color Analyzer(CA-110, CA-100 or same production)

5-2. Connection diagram of equipment for

measuring

(1) To adjust the deviation of the STB signal output.
(2) Use regular PDP Monitor(JIG).

5-3. Adjustment Method

• Connect the STB to regular PDP Monitor.

• Operate the zero-calibration of the CA-100, then stick
sensor to surface of PDP module when you adjust.

(1) Select ITE PATTERN of HEAT RUN mode by pressing

SVC button on Remote Control for adjustment, then
operate HEAT RUN more than 15 minute.
(Operate the HEAT RUN to adjust the STB at first, then if
OFF hour don’t keep more than 3 minutes, operate next
adjustment of the STB without HEAT RUN.)

(2) Supply window Signal to TD-710 in pattern generator.

[ When adjustment is operated manually, perate process (3)

to (7) regular sequence, when adjustment is operated
automatically perate process (1) to (2).

(3) Select STB CXA2101 by pressing SVC,ADJUST button on

Remote Control for adjustment.

(4) To adjust Low Light, stick sensor to 9th pattern(Dark).

Select the B Cut/R Cut, then adjust the B Cut/R Cut until
color coordination becomes X=0.280±0.003,
Y=0.310±0.003 and color temperature becomes 8.800cK ±
500cK by pressing VOL+, - button. (Adjust in B Cut 10±1,
R Cut 6±1)

(5) To adjust High Light, stick sensor to 2th pattern(White).

Select the R Gain/G Gain, then adjust the R Gain/G Gain
until color coordination becomes X=0.280±0.003,
Y=0.310±0.003 and color temperature becomes 8.800cK
±500cK. (B-Gain fixation)

(6) Confirm the result of the High Light adjustment.

If the deviation of High Light occur, operate the adjustment
of Low Light and High Light again.
(Expectation average adjustment data : B-Cut & R­Cut=6±2, R-Gain/G-Gain=25±3)

(7) Exit adjustment mode using A/V button.

6. Adjustment of VIF-VCO COIL

6-1. Preparation for Adjustment

(1) Connect the equipment for measuring as below.
(2) Setting equipment for measuring.

RF Signal generator

COLOR

ANALYZER

TYPE; CA-100

CVBS Signal Input

PDP MONITOR

RT-BA10(STB)

Window Pattern

MSPG-2100 or MSTG-5200

High Light

120±5cd/m2

Low Light
6±1cd/m2

<Fig 3> Connection Diagram of STB Automatic Adjustment

ADJ.Point

X106

VR101

System

B/G,D/K/I,SECAM-L

SECAM-L’

Frequency

38.9

34.25

Modulation

OFF
OFF

Level
80dBuV
80dBuV

* If any model don t have SECAM-L/L System, you should not
operate adjustment of VR101.
* Output of Power Supply = DC 5V
* Oscilloscope range = set 0.5V/div., 5msec/Div.(using scope)

6-2. Adjustment 38.9MHz IF(B/G, D/K, I, L, M)

(1) Input the signal of the signal generater(38.9MHz) to

TP105(IC102 pin 7) through 0.01uF(103) capacitor.
(2) S1 : OFF, S2 : IN, S3 : OFF
(3) Adjust voltage of the TP103 to 2.5

0.1V by adjusting

X106.

6-3 Adjustment L VCO(Adjustment
SECAM-L ) --> Only SECAM L model

(1) After changing the signal of the signal generater to

34.25MHz, input the signal to TP102(IC102 pin 11) through

0.01uF(103) capacitor.
(2) S1 : on, S2 : off, S3 : ON
(3) Adjust voltage of the TP103 to 2.5

0.1V by adjusting

VR101.

7. Adjustment AGC

7-1 Preparation for Adjustment

(1) Connect the signal of PAL-B/G 05ch. to Antenna jack.
(2) Connect Multi meter to point(J150) of AGC adjustment.

7-2 Adjustment

Adjustment the voltage of Multi meter to 2.3 0.1V by
changing VR102.

8. OPTION TABLE

8-1 Funtion of Line Service

(1) • Enter to SVC mode by using SVC button on the remote

control.

•To enter to the SVC mode,press the “OK” button on RT­BA10 local key ond “OK” button on the remote control
simultaneously.

• In MT-BA10 only,press the “INPUT” button and “OK” button
on remote control to enter to SVC mode.

(2) Select the item by using the Quick View(Yellow) button.
(3) After adjusting,restore adjusted item in EEPROM by using

“OK” button and use the CYAN button to cancel the
adjusted condition.

(4) Select the program directly and input the data of option by

using the number button.

(5) Line SVC-0(Hitrun&W/B Adj.mode)=> VSC EEPROM

• H/T RUN:OFF,WHITE,RED,GREEN,BLUE,OFF

• A/C SRT:Auto Cutoff

• R/G/B Fine 16,R/G/B Gain 3,R/G/B Cutoff 100

(6) Line SVC-1(Phase&Position Adj.mode)=> VSC EEPROM

• Phase 15,H-Pos 32,V-Pos 32,Auto Position

(7) VSC CXA2101 Adj.mode)=> VSC EEPROM

(8) STB CXA2101 Adj.mode)=> STB EEPROM

(9) SOUND Adj.mode => VSC EEPROM

(10) Option 1 Adj.mode => VSC EEPROM

• Select it directly by using Teletext Size button.

- 10 -

IC102

TDA4474

TP103

ST-BY 5V:P001

24

7

13
15

1

0.01uF

TP105

X106
(VCO)

5V

Power­Supply

V Multimeter or Oscilloscope

TP110

38.9MHz

34.25MHz

(B/G,D/K,I,L)
(SECAM-L')

100 ohm
S1

5V

4.7 Kohm
S3

Q122

VR122

R144

16

TP112(IF VCC)

S2

TP111

100 ohm

11 TP102

VR102(AGC)

(STB MAIN)

BC 7

RC 7
RG 10
GG 10
BG 10

SUB-CON 3
SUB-BRI 54

SUB-COL 0

SUB-HUE 14

SUB-SHP 3

CTI 0

RYR 6

GYR 10

RYB 9

GYB 5
GMM 5
BLK 15

PRE 1

DCT 1

DPI 2

VTC 3

HWI 1

DCO 1

HDT 0
SFO 1

BC 7

RC 7
RG 31
GG 31
BG 31

SUB-CON 3
SUB-BRI 54

SUB-COL 0
SUB-HUE 7
SUB-SHP 0

CTI 0

RYR 6

GYR 10

RYB 9

GYB 5
GMM 0
BLK 15

PRE 1

DCT 0

DPI 0

VTC 3

HWI 1

DCO 0

HDT 0
SFO 1

CON 25

BRI 31
COL 31
HUE 31
SHP 31

FP
NP
SP

SC VOL

STB VOL

14
80
25
83
118

System

Aus/China

ACMS

TOP

A2MONO

TXT LAN

Language

2
0

1

0

0

6
6

0:BG/I/DK 1:BG/I/DK/L 2:BG/I/DK/M
0:CCIR BG/OIRT DK
1:Australia BB/China DK
0:
1:Channel Name Labeling
0:TOP=>SIMPLE
1:TOP
0:Sound treatment normally
1:Don’t recognize the Stereo(NICAM
treatment normally) => A part of AFRICA

0:E only,1:EU5,2:NON,3:China,4:Arabic
5:Parsi,6:All

(10) Option 2 Adj.mode

• Select it directly by using Teletext Hold button.

8-2 OSD LANGUAGE

( Select a one among Option in SVC Mode-Language item.)

8-3 TXT LANGUAGE

( Select a one among Option in SVC Mode-TXT LAN item.)

- 11 -

Turbo

I/II save

Woofer

TEXT

Vol Curve

PIP

0

1

0

0

1

0

0:NORMAL Search
1:Turbo Search not use
0:EU
1:NON EU
0:Without Woofer
1:With Woofer
0:Without TEXT
1:With TEXT
0:EU Curve
1:Non EU Curve
0:Without PIP
1:With PIP

0
1
2
3
4
5
6

E Only(English)
EU5(Enlish,German,French,Italian,Spanish)
NON 12
CHINA(English,Chinese)
ARAB(English,French,Arabic,Urdu)
PARSI(English,Parsi)
ALL(Enlish,Norwegian,Czech,German,Danish,Ru
ssian,French,Finish,Chinese,Italian,Portuguess,
Arabic,Spanish,Rumanian,Urdu,Dutch,Polish,
Persian,Swedish,Hungarian)

6

38

40

55

70

128

English,French,SWedish,Czech,German,
Spanish,Italian
Polish,French,SWedish,Czech,German,Spanish,
Italian,English
English(US),French,SWedish,Czech,German,
Spanish,Italian,English(TPU3050 US)
English,French,SWedish,Turkish,German,
Spanish,Italian,English(TPU3050 Turkish)
English(US),Slovakian,Hungarian,Serbian,
Albanian,Polish,Turkish,Rumanian
Polish,Cylrillic,Estonia,Estonia,Estonia,Estonia,
Estonia,Estonia(TPU3051)

128

129

129

130

130

131

131

132

English,French,French,French,French,French,
French,Arabic(TPU3052)
Polish,Cylrillic,SWedish,Czech,Estonia,Estonia,
Estonia,Estonia(TPU3051)
Hebrew,Hebrew,Hebrew,Hebrew,Hebrew,
Hebrew,Hebrew,Arabic(TPU3052)
English,French,SWedish,Turkish,German,
Spanish,Italian,Greek(TPU3051)
English,French,French,Turkish,French,French,
French,Italian(TPU3052)
English,Turkish,Turkish,Turkish,German,Turkish,
Turkish,Greek(TPU3051)
French,French,French,Turkish,French,French,
French,Italian(TPU3052)
English,French,French,French,French,French,
Arabic(TPU3052)