LG MC007A Service Manual

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¡ Safety Precautions

1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument.

2. Never disconnect leads while the TV receiver is on.

3. Don't short any portion of circuits while power is on.

4. The adjustment must be done by the correct appliances.

5. Unless otherwise noted, set the line voltage to 230Vac¡ 10%, 50Hz.

5. The adjustment of TVshould be performed after warming up for 15 minutes.

¡ Test Equipment required

1. RF signal generator (with pattern generator)

2. DC Power Supply

3. Multimeter (volt meter)

4. Oscilloscope

5. Color analyzer

PIF (Picture Intermediate Frequency) Adjustment

1) Connect the measuring equipment to the Main Board as shown in Fig.1.

2) Set RF frequency and output level of RF SIGNAL GENERATOR as shown Table 1.

3) Turn off S1 and S3 and on S2.

4) Adjust L104 so that the DC voltage may be 2.4¡ 0.05Vdc.

(Table 1)

¡ L’ VCO Adjustment (For SECAM-L’ MODEL)

1) Connect the measuring equipment to the Main Board as shown in Fig.1.

2) Set RF frequency and output level of RF SIGNAL GENERATOR as shown Table 1.

3) Turn on S1,S3 and off S2.

2) Adjust VR122 so that the DC Voltage may be 2.4¡ 0.05Vdc.

RF AGC (Automatic Gain Control) Adjustment

1) Input PAL-B/G 05 CH.

2) Connect Multimeter to TP2(J15),AGC adjustment point.

3) Adjust VR121 until the voltage of Multimeter becomes

2.5¡ 0.1V.

¡ Screen Voltage Adjustment

1) Tune the RF Modulator to receive a PAL or SECAM signal.

2) Press MIX button on remote controller for Service to get into the Screen Adjust Mode.

3) Adhere the Color Analyzer on the White window of CPT face.

4) Adjust Screen Volume of FBT so that the luminance of White window is 12¡ 1 FL.

¡ Focus Adjustment

1) Tune the TV set to receive a digital pattern.

2) Adjust the upper Focus volume of FBT for the best focus of vertical line B.

3) Adjust the lower Focus volume of FBT for the best focus of area A.

4) Repeat above step 2) and 3) for the best overall focus.

IC101

TDA4470

TP1(VCO)

IC102(KI7805)

13 14

0.01uF

JP1

L104

PowerSupply

V Multimeter or Oscilloscope

JP2

38.9MHz

34.25MHz

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

100 ohm S1

4.7 Kohm

JP3

100 ohm

Q122

VR122

R108

R144

Test Point : TP1

Adjust : L104

Test Point : TP1

Adjust : VR122

Frequency

38.9MHz

34.25MHz

System

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

SECAM-L’

Modulation

OFF OFF

Output level

10mVp-p 10mVp-p

Adjust

L104

VR122

Fig. 1 : Connection Diagram of Equipment for PIF Adjustment

ADJUSTMENT INSTRUCTIONS

Test Point : TP 2(J15)

Adjust : VR121

Test Point : CPT Face

Adjust : Screen Control of FBT

Test Point : Observing Display

Adjust : Focus control of FBT

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¡ Deflection Data Adjustment (Line SVC-2)

NOTE : How to enter into the Line Service Mode with a remocon.

1.Power off.

2.Press the Red button.

3.Press the Green button.

4.Press the Yellow button.

5.Press the Cyan button.

6.Press the OK button.

7.Power On.

1. Preparation for Deflection Adjustment

1) At SVC mode, press the Yellow colored button the SVC remocon. And then,deflection data adjustment OSD(SVC2 mode) will be displayed.

2) Press Channel UP/DOWN button for desirous function Adjustment.

3) Press Volume UP/DOWN button to adjust the data.

4) Tune the TV set to receive a PAL B/G Digital pattern.

VL (Vertical Linearity)

Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.

VA (Vertical Amplitude)

Adjust so that the circle of a digital circle pattern may be located within the effective screen of the CPT.

SC (Vertical “S” Correction)

Adjust so that all distance between each horizontal lines are to be the same.

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.

HS (Horizontal Shift)

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

EW (Horizontal Width)

Adjust to that a digital circle pattern looks like exact circle.

EP (East-west Parabolar)

Adjust so that middle portion of the outermost left and right vertical line looks like parallel with vertical lines of the CPT.

EC (East-west Coner)

Adjust so that the vertical line at every 4 corners of the screen looks like parallel with the vertical lines of the CPT.

ET (East-west Trapezium)

Adjust to make the length of top horizontal line same with it of the bottom horizontal line.

POP (POP Position)

Adjust until the distance between POP and main picture becomes about 1mm.

(Table 2)

¡ White Balance Adjustment.(LINE SVC 1)

NOTE : This adjustment should be performed after screen

voltage adjustment.

1) Tune the TV set to receive an 100% white pattern.

2) Press the Yellow button on remote controller in the SVC Mode.

3) Press PSM (RED) button on remote controller. (Standard picture)

4) Press PR+ or PR- button for desirous function adjustment.

5) Adjust Low Light status of CR and CB with VOL+ or VOLat CG:50 until X=268

¡ 8,Y=273¡ 8.

6) Adjust High Light status of RG and BGB with VOL+ or VOL- at CG:370 until X=268

¡ 8,Y=273¡ 8.

7) Repeat above step 5) and 6) until each status of High Light and Low Light for X=288

¡ 8,Y=295¡ 8 with color

analyzer(color temperature 9000

K).

Fig. 2

VS VA

VL SC HS EW

ES EC

POP P

0600H~0900H 0050H~00CFH 0025H~00BFH

0000H~009FH

0000H~003FH 0400H~0EFFH 0700H~08FFH 06E0H~0840H 06A0H~0AFFH 0790H~08E0H 0790H~08E0H

07D2

0095

0001 00D9 001E 0A9D 07FF

0787

0815

0850 000B

Range 29” Flat 29” S-Flat

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(Table 3)

¡ SVC Data & PSM,SSM Data.

Table 1. ABL Data (LINE SVC-3)

Table 2. SOUND PRE-SCALER (LINE SVC-4)

Table 3. PSM Data

DVCO

IBRM WDRM BCLTH BCLTM BCLGA

SVGA

SVDEL

SVD1

LDLY

HBST

HBSO

0~1FFH 0~3FFH 0~7FFH 0~1FFH 0~1FFH

0~01FF 0~01FF

00C8

0190 0065

000B

0007 0008 0005 0003 0001

00F0

0158

Range 29” Flat 29” S-Flat

FP NP SP

S1 VOL S2 VOL

0~127 0~127 0~127 0~127 0~127

0011 0045 001E 0042 0042

Range DATA

Mode

CONTRAST

BRIGHT

COLOR

SHARPNESS

90 50 50 50

100

55 60 60

60 60 40 40

50 60 40 30

STANDARD DYNAMIC MILD GAME

CR CG CB RG GG BG

0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511

50 50

50 370 370 370

Range

DATA

¡ OPTION Adjustment (LINE-SERVICE OPTION)

Table 4. OPTION Function

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OPTION

GAME

TEXT

TOP

ACMS

CH+AU

EYE TURBO SCART

A2 ST

I II SV

MONO

VOL

H-PH

DGS

TILT

200PRO

AV2

HOTEL

KEY

SYS

M-VOL

OSD

T-LAN

GAME

TEXT

TOP

China,Australia

EYE

Turbo Search

SCART

STEREO

I/II

MONO

Middle East Africa,India VOL.

H/Phone

Degaussing

TILT

China Only

Back:JACK(2EA)

HOTEL

0 X X X

Australia Only

X X X X X X

Normal VOL.

Back:JACK(1EA)

Option 1

Option 2

Option 3

Option 4

ICP(V)01.

Q401, Q402, T401.

(OPTION)

33V

F854, D861, R405.

D850, L853, T402.

pin 32 of IC01.

3.3V 0V

IC01, FR403, FR413,

D405, D406, IC301,

ICP(V)01.

IC852(3), IC854(5), FR406,

D408, D858, Q856.

Q05, IC851, IC802(3), IC856.

C804

F(P)801, SW(P)801, T1111,

T801, R802, DB801.

pin4

T802, R809, D802.

18V

Trouble Shooting

37~39 12

ICP(V)01, Q124

CPT PCB ASSY.

ICP(V)01.

FR403, FR413, D405, D406.

ICP(V)01.

IC301, D301.

P901.

Q2902~2910, VM COIL.

ICP(V)01, QP(V)04~06.

at pin 44 of ICP(V)01.

at pin 12 of IC01.

at pin 41~43 of ICP(V)01.

ICP(V)01.

QP(QV)02, ICP(V)01.

P502A.

ICP(V)01.

IC302.

R408.

Q302, Q303. D401, D402, C405.

FR402, D404, IC302.

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