LG 42PG2HD Schematic

PLASMA TV

MANUAL DE SERVICIO

ATENCIÓN

Antes de dar servicio al chasis, lea las PRECAUCIONES DE SEGURIDAD en este manual.

CHASIS : PU84A

MODELO : 42PG2HD 42PG2HD-UA

North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com

Internal Use Only

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LGE Internal Use Only

CONTENIDO

CONTENIDO ............................................................................................................................ 2

PRECAUCIONES DE SEGURIDAD .........................................................................................3

INSTRUCCIONES DE AJUSTE ...............................................................................................4

GUÍA PARA SOLUCIONES DE PROBLEMAS.......................................................................10

DIAGRAMA EN BLOQUE ......................................................................................................15

VISTA EN DESPIECE .............................................................................................................22

LISTA DE VISTA EN DESPIECE.............................................................................................23

DIAGRAMA ESQUEMÁTICO......................................................................................................

TABLERO DE CIRCUITO IMPRESO ..........................................................................................

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LGE Internal Use Only

PRECAUCIONES DE SEGURIDAD

ADVERTENCIA: Antes de dar servicio a este chasis, lea "PRECAUCIONES RESPECTO A RADIACION POR RAYOS X",

"INSTRUCCIONES DE SEGURIDAD" y "AVISO SOBRE SEGURIDAD DE PRODUCTOS"

Muchas de las partes, electricas y mecánicas en este chasis tienen caracteristicas relacionadas con la seguridad. Estas caracteristicas frecuentemente pasan desapercibidas en las inspecciones visuales y la proteccion que proporcionan contra la RADIACION DE RAYOS-X no siempre necesariamente se obtiene al mismo grado cuando se reemplazan piezas o componentes diseñados para voltajes o vatajes mayores, etc. Las piezas que tienen estas caracteristicas de seguridad se identifican por la marca impresa sobre el diagrama esquematico. Antes de reemplazar alguno de esos componente, lea cuidadosamente la lista de este manual. El uso de partes de reemplazo que no tengan las mismas caracteristicas de seguridad, como se especifica en la lista de partes, puede crear Radiacion de Rayos-X.

1. Cuando el receptor está en operación, se producen voltajes potencialmente tan altos como 25,000-29,000 voltios. Operar el receptor fuera de su gabinete o con la tapa trasera removida puede causar peligro de choque eléctrico. (1) Nadie debe intentar dar servicio si no está debidamente

familiarizado con las precauciones que son necesarias cuando se trabaja con un equipo de alto voltaje.

(2)Siempre descargue el ánodo del tubo de la imagen a tierra

para evitar el riesgo de choque eléctrico antes de remover la tapa del ánodo.

(3)Descargue completamente el alto potencial del tubo de

imagen antes de manipularlo. El tubo de la imagen es de alto vacío y, si se rompe, los fragmentos de vidrio salen despedidos violentamente.

2. Si se quemara algún fusible de este receptor de televisión, reemplácelo con otro especificado en la lista de partes.

3. Cuando reemplace tableros o plaquetas de circuitos, cuidadosamente enrolle sus alambres alrededor de las terminales antes de soldar.

4. Cuando reemplace un resistencia de vataje (resistor de película de óxido metálico) en el Tablero o Plaqueta de circuitos, mantenga la resistencia a un mínimo de 10mm de distancia.

5. Mantenga los alambres lejos de componentes de alto voltaje o de alta temperatura.

6. Este receptor de televisión debe conectarse a una fuente de 100 a 240 V AC.

7. Antes de devolver este aparato al cliente, haga una verificación de fuga de corriente sobre las partes metálicas del gabinete expuestas, tales como antenas, terminales, cabezas de tornillos, tapas de metal, palancas de control etc., para estar seguro de que el equipo funciona sin peligro de choque eléctrico. Enchufe el cordón directamente al tomacorriente de la línea de AC 100-240V.

No utilice una línea aislada de transformador durante esta verificación. Use un voltímetro de 1000 Ohmios por voltio de sensibilidad o más, en la forma que se describe a continuación. Cuando la unidad está ya conectada a la AC, pulse el conmutador primero poniéndolo en "ON" (encendiendo) y luego en "OFF" (apagando), mida desde un punto de tierra conocido, tal como una (cañería de metal, una manija metálica, una tubería etc.) a todas las partes metálicas expuestas del receptor de televisión (antenas, manijas de metal, gabinetes de metal, cubiertas de metal, palancas de control etc.,) especialmente cualquiera de las partes metálicas expuestas que puedan ofrecer un camino hacia el chasis. Ninguna medición de corriente eléctrica debe exceder de 0.5 miliamperios. Repita la prueba cambiando la posición del enchufe en el tomacorriente. Cualquier medición que no esté dentro de los límites especificados aquí representan un riesgo potencial de choque eléctrico que debe ser eliminado antes de devolver el equipo al cliente.

INSTRUCCIONES DE SEGURIDAD

AVISO SOBRE SEGURIDAD DE PRODUCTOS

DEVICE UNDER

TEST

TEST ALL

EXPOSED MET AL

SURFA CES

2-WIRE CORD

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

EAR TH GROUND

LEAKAGE CURRENT TESTER

(READING SHOULD

NO T BE ABOVE

0.5mA)

+-

Aparato bajo examen

Probador de fuga de corriente

La lectura no debe exceder de 0.5mA

Pruebe todas las superficies metálicas

Tambien pruebe cón los enchufes al reves (utilizando adaptador en caso necesario)

Tierra suelo

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LGE Internal Use Only

INSTRUCCIONES DE AJUSTE

1. Application Range

This spec. sheet is applied to all of the PU84A chassis.

2. Specification

(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±5cC of temperature and 65±10% of relative humidity if

there is no specific designation. (4) The input voltage of the receiver must keep 100~240V,

50/60Hz.

Caution : 42PG20-UA must keep 100 ~ 120V, 50/60Hz.

(5) The receiver must be operated for about 15 minutes prior

to the adjustment.

O After RGB Full White in HEAT-RUN Mode, the receiver must

be operated prior to the adjustment.

O Enter into HEAT-RUN MODE

(1) Press the POWER ON KEY on R/C for adjustment. (2) Press the ADJ KEY on R/C and enter EZ ADJUST

Select “4. White Pattern” by using

D/E(CH +/-) and press

ENTER(

V)

Select “White” by using

F/G(VOL +/-) and press

ENTER(

V)

- Set is activated HEAT run without signal generator in this

mode.

- Single color pattern ( RED / BLUE / GREEN ) of HEAT RUN

MODE uses to check panel.

Caution: If you turn on a still screen more than 20 minutes

(Especially digital pattern, cross hatch pattern), an after image may be occur in the black level part of the screen.

3.

Download

(1) Execute ISP program “Mstar ISP Utility” and then click

“Config” tab. (2) Set as below, and then click “Auto Detect” and check “OK”

message If display “Error”, Check connect computer, jig,

and set. (3) Click “Connect” tab. If display “Can’t” , Check connect

computer, jig, and set.

(4) Click “Read” tab, and then load download file(XXXX.bin)

by clicking “Read”

(5) Click “Auto” tab and set as below (6) Click “Run”. (7) After downloading, check “OK” message.

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LGE Internal Use Only

4. ADC Process

4-1. PC Input ADC

(1) Auto RGB Gain/Offset Adjustment

1) Convert to PC in Input-source I2C COMMAND: 0xF4 (SELECT_INPUT) 0x00 0x60 (RGB) cf. 0x10(TV), 0x20(AV), 0x40(COMPONENT), 0x60(RGB), 0x90(HDMI)

2) Signal equipment displays Output Voltage : 700 mVp-p Impress Resolution XGA (1024 x 768 @ 60Hz) Model : 60 in Pattern Generator Pattern : 65 in Pattern Generator (MSPG-925 SERISE) [gray pattern that left & right is black and center is white signal (Refer below picture)].

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction.

(2) Confirmation

1) We confirm whether “0xB6(RGB)” address of EEPROM “0xA2” is “0xAA” or not.

2) If “0xB6(RGB)” address of EEPROM “0xB2” isn’t “0xAA”, we adjust once more

3) We can confirm the ADC values from “0xB0~0xB5(RGB)” addresses in a page “0xA2”

[ Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust” by pushing “

G” key at “0. ADC CALIBRATION “.

4-2. COMPONENT Input ADC

(1) Component Gain/Offset Adjustment

1) Convert to Component in Input-source I2C COMMAND : 0xF4 (SELECT_INPUT) 0x00 0x40 (COMPONENT) cf. 0x10(TV), 0x20(AV), 0x40(COMPONENT), 0x60(RGB), 0x90(HDMI)

2) Signal equipment displays Impress Resolution 480i MODEL : 209 in Pattern Generator(480i Mode) PATTERN : 65 in Pattern Generator(MSPG-925 SERISE)

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction

4) Signal equipment displays Impress Resolution 1080i MODEL : 223 in Pattern Generator(1080i Mode) PATTERN : 65 in Pattern Generator(MSPG-925 SERISE)

5) Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction

[ Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust” by pushing “

G” key at “0. ADC CALIBRATION”.

Adjustment pattern (RGB, COMPONENT)

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LGE Internal Use Only

4-3. Confirmation

(1) We confirm whether “0xBF(480i)/0xC8(1080i)” address of

EEPROM “0xA2” is “0xAA” or not.

(2) If “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2”

isn’t “0xAA”, we adjust once more

(3) We can confirm the ADC values from “0xB9 ~ 0xBE(480i) /

0xC2 ~ (1080i)” addresses in a page “0xA2”

[ Manual ADC Confirmation using Service Remocon. After enter

Service Mode by pushing “INSTART” key.

Caution: Each PCB assembly must be checked by check JIG set.

(Because power PCB Assembly damages to PDP Module, especially be careful)

Caution: Set up “RF mode(noise)” before voltage adjustment.

5. POWER PCB Ass’y Voltage Adjustment

(Va, Vs voltage Adjustment)

5-1. Test Equipment:D.M.M 1EA 5-2. Connection Diagram for Measuring

Refer to Fig.1, Fig 2

5-3. Adjustment Method

(1) 50” Va Adjustment (refer fig.1)

1) After receiving 100% Full White Pattern, HEAT RUN.

2) Connect + terminal of D.M.M. to Va pin of P802, connect-terminal to GND pin of P802.

3) After turning VR902,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

(2) 50” Vs Adjustment (refer fig.1)

1) Connect + terminal of D.M.M. to Vs pin of P802, connect

-terminal to GND pin of P802.

2) After turning VR901, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top (deviation ; ±0.5V)

(3) 42” Va Adjustment (refer fig.2)

1) After receiving 100% Full White Pattern, HEAT RUN.

2) Connect + terminal of D.M.M. to Va pin of P811, connect

-terminal to GND pin of P811.

3) After turning VR901,voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top (deviation; ±0.5V)

(4) 42” Vs Adjustment (refer fig.2)

1) Connect + terminal of D. M..M. to Vs pin of P811, connect -terminal to GND pin of P811.

2) After turning VR951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top (deviation ; ±0.5V)

(Fig. 1) 50inch Power PCB Assy Voltage Adjustment

(Fig. 2) 42inch Power PCB Assy Voltage Adjustment

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LGE Internal Use Only

6. DDC EDID Write (MODEL NAME: LG TV)

Caution: Press the POWER ON KEY on R/C before EDID download.

EDID download is processed automatically through RS-232C PC(for communication through RS-232C), UART baud rate: 115200 bps

O EDID Download Protocol (RS-232C)

O HDMI-1 EDID DATA

O HDMI-2 EDID DATA

O HDMI-3 EDID DATA

O RGB EDID DATA

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LGE Internal Use Only

7. Adjustment of White Balance

Caution: Press the POWER ON KEY on R/C before W/B adjustment.

7-1. Test Equipment

- Color Analyzer (CS-1000, CA-100+(CH.10), CA-210(CH.10))

[ Please adjust CA-100+ / CA-210 by CS-1000 before measuring

--> You should use Channel 10 which is Matrix compensated (White, Red, Green, Blue revised) by CS-1000 and adjust in accordance with White balance adjustment coordinate.

O Color temperature standards according to CSM and Module

O Change target luminance and range of the Auto adjustment

W/B equipment.

O White balance adjustment coordinate and color temperature

7-2. Connecting Picture of the Measuring

Instrument

(On Automatic control ) Inside PATTERN is used when W/B is controlled. Connect to auto controller or push control R/C ADJ Key—> Enter the mode of White-Balance, the pattern will come out.

7-3. Auto-control Interface and Directions

(1) Adjust in the place where the influx of light like floodlight

around is blocked. (illumination is less than 10ux).

(2) In case of PDP: Measure and adjust after sticking the Color

Analyzer (CA-100+, CA210) to the side of the module.

In case of LCD: Adhere closely the Color Analyzer ( CA210 ) to the module less than 10cm distance, keep it with the surface of the Module and Color Analyzer’s Prove vertically.(80~100°).

(3) Aging time

1) After aging start, keep the power on (no suspension of power supply) and heat-run over 15 minutes.

2) In case of PDP, keep white pattern using inside pattern.

3) In case of LCD, using ’no signal’ or ‘full white pattern’ or the others, check the back light on.

O Auto Adjustment Map(RS-232C)

7-4. Manual White Balance

1) Press the ADJ KEY on R/C and enter EZ ASJUST Select “3. Test Pattern” by using

D/E(CH +/-) and press

ENTER(

V)

Select “White” by using

F/G(VOL +/-) and press

ENTER(

V) and heat run over 15 minutes.

2) Zero Calibrate CA-100+ / CA-210, and when controlling, stick the sensor to the center of PDP module surface.

3) Press the ADJ KEY on R/C and enter EZ ASJUST Select “2. White Balance” and press

G(VOL +)

Set test-pattern on and display inside pattern.

4) Control is carried out on three color temperatures, COOL, MEDIUM, WARM. (Control is carried out three times)

<Temperature: COOL>

- R-Cut / G-Cut / B-Cut is set to 64

- Control R-Gain and G-Gain.

- Each gain is limited to 192

<Temperature: MEDIUM>

- R-Cut / G-Cut / B-Cut is set to 64

- Control R-Gain and G-Gain.

- Each gain is limited to 192

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LGE Internal Use Only

<Temperature: WARM>

- R-Cut / G-Cut / B-Cut is set to 64

- Control G-Gain and B-Gain.

- Each gain is limited to 192

8. HDCP(High-Bandwidth Digital Contents Protection) SETTING

(1) Connect D-sub Signal Cable to D-Sub Jack (2) Input HDCP key with HDCP-key- in-program (3) HDCP Key value is stored on EEPROM(AT24C512) which

is 80~A1 addresses of 0xA0~0xA2 page

(4) AC off/ on and on HDCP button of MSPG925 and confirm

whether picture is displayed or not of using MSPG925

(5) HDCP Key value is different among the sets.

9. RS-232C

Press In-start key and select 3.Baud Rate menu. Check RS232C after changing Baud Rate 115200.

10. OPTION

(1) Press ADJ R/C In-start key and select 0.AREA OPTION (2) Select Country by using

F/G(VOL +/-) in accordance with

destination

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LGE Internal Use Only

GUÍA PARA SOLUCIONES DE PROBLEMAS

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LGE Internal Use Only

Power-Up Boot Fail Trouble Shooting

Check P701 All

Voltage Level (16V, 5V)

Check Power connector

OK ?

Replace Power board

Y

NY

Check IC706 #2 Pin

Voltage Level 2.6V

Replace IC706 &

Recheck

Y

N

Check X100 Clock

12MHz

Replace 100

Y

N

Replace IC105 Flash Memory

Check Q706 Output

Voltage Level (5V)

Replace Q801

N

Y

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LGE Internal Use Only

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LGE Internal Use Only

No OSD Trouble Shooting

Check P302

#33(TXAC-) , #32(TXAC+) ,

#17(TXBC-) , #16(TXBC+)

Maybe Mstar has problems

Check LVDS Cable

Check PDP Module

Control board

Refer to Module CAS

Y

N

Y

Replace Cable

N

Y

Check PDP Vs,Va Voltage

Module 5V

Replace Power

N

Check P701 Disp_EN,

VaVs ON, 5V_MNT

Check GPIO Path

N

Y

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LGE Internal Use Only

No OSD Trouble Shooting (Module Power Sequence)

Normal Display

Vcc

(5V)

Va

Vs

DISPEN

T

VaR

T

VsR

T

On

T

VaF

T

VsF

T

Off

☞1)

Power_on

3 Sec

Power_off

3 Sec

Min

100ms

Min. 2Frame

(Recommend: 2 sec)

msec50090Falling Time of Vs (90% to 10%)T

VsF

msec2000600

Time interval between 90% of Vcc and 90% of Vs

when Power On

T

on

+

T

VsR

msec800100Rising Time of Vs (10% to 90%)T

VsR

msec30050Falling Time of Va (90% to 10%)T

VaF

msec30010Rising Time of Va (10% to 90%)T

VaR

msec-20

Time interval between 10% of Vs and 90% of Vcc

when Power Off

T

Off

msec-500

Time interval between 90% of Vcc and 10% of Vs

when Power On

T

On

unitMax.Min.DescriptionSymbol