LG 42pg6900 schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PD84A

MODEL : 42PG6900 42PG6900-ZF

website:http://biz.LGservice.com

Internal Use Only

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LGE Internal Use Only

CONTENTS

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

SAFETY PRECAUTIONS............................................................................................3

SPECIFICATION..........................................................................................................4

ADJUSTMENT INSTRUCTION ...................................................................................6

BLOCK DIAGRAM.....................................................................................................13

EXPLODED VIEW .................................................................................................... 17

EXPLODED VIEW PARTS LIST................................................................................18

SVC. SHEET .............................................................................................................19

PRINTED CIRCUIT DIAGRAM..................................................................................36

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LGE Internal Use Only

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.

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

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LGE Internal Use Only

SPECIFICATIONS

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

V Application Range

This spec is applied to the PDP-DVR TV used PD84A Chassis.

V Specification

Each part is tested as below without special appointment.

1) Temperature : 25±5°C (77±9°F), CST : 40±5

2) Relative Humidity: 65±10%

3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz) * Standard Voltage of each product is marked by models.

4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.

5) The receiver must be operated for about 20 minutes prior to the adjustment.

V Test Method

1) Performance : LGE TV test method followed.

2) Demanded other specification

Safety : CE, IEC specification EMC : CE, IEC

V Module General Specification

1) 42” Module

Display Screen Device Aspect Ratio PDP Module

Operating Environment

Storage Environment

Input Voltage

1 2 3

No Item Specification Remark

42 inch Wide Color Display Module 16:9 PDP42G1####, RGB Closed Type Glass Filter

1)Temp. : 0 ~ 40deg

2)Humidity : 20 ~ 80%

3)Temp. : -20 ~ 60deg

4)Humidity : 10 ~ 90% 100-240V~, 50/60Hz

PDP

LGE SPEC.

Maker : LG

Chassis

PD84A 42PG6900

50PG6900 42PG6910 50PG6910

UK/Austria/Belgium/Croatia/Czech/Denmark/Finland

/France/Germany/Hungary/Italy/Luxembourg/Netherlands/

Poland/Russia/Spain/Sweden/Switzerland

Model Name Market Brand Remark

42PG6900 50PG6900 42PG6910 50PG6910

Safety : IEC/EN60065,

EMI : EN55013 EMS : EN55020

UK/Austria/Belgium/Croatia/Czech/Denmark/Finland

/France/Germany/Hungary/Italy/Luxembourg

/Netherlands/Poland/Russia/Spain/Sweden/Switzerland

Model ApplianceMarket

TEST

Remark

2) 50” Module

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LGE Internal Use Only

Display Screen Device Aspect Ratio PDP Module

Operating Environment

Storage Environment

Input Voltage

1 2 3

No Item Specification Remark

50 inch Wide Color Display Module 16:9 PDP50G1####, RGB Closed Type Glass Filter

1)Temp. : 0 ~ 40deg

2)Humidity : 20 ~ 80%

3)Temp. : -20 ~ 60deg

4)Humidity : 10 ~ 90% 100-240V~, 50/60Hz

PDP

LGE SPEC.

Maker : LG

Market

Broadcasting system

Receiving system

Scart Jack (2EA)

Video Input (2EA) S-Video Input (1EA) Component Input (1EA) RGB Input HDMI Input(3EA)

Audio Input (4EA)

5 6 7 8 9

No Item Specification Remark

UK, France, Germany, Spain, Sweden, Finland, Italy

1) PAL-BG

2) PAL-DK

3) PAL-I, I’

4) DVB-T(ID TV)

5) SECAM-L/L’ Analog: Upper Heterodyne Digital: COFDM PAL, SECAM

PAL, SECAM, NTSC PAL, SECAM, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC HDMI-PC(HDMI 1 only) HDMI-DTV & SOUND PC Audio, Component, AV

Scart1 is Full scart and support RFOUT(Analog). Scart2 is Half scart and support DTV/MNTOUT. 4 System: PAL, SECAM, NTSC, PAL60 4 System: PAL, SECAM, NTSC, PAL60

Rear 2EA Side 1EA L/R Input

V Model General Specification

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LGE Internal Use Only

1. Application Range

This spec sheet is applied all of the PD84A chassis by manufacturing LG TV Plant or sort plants.

2. Specification

Caution: The module keeping condition

O The module keeping condition: The normal temperature

condition(more than 15°C)

--> Immediately the line supply.

O The module keeping condition: 0°C

--> The module must be kept for more than 2 hours at the normal temperature.

O The module keeping condition: -20°C

--> The module must be kept for more than 3 hours at the normal temperature.

O The case of Gu-mi factory at the winter season.

--> The module must be kept for more than 5 minutes at the heating zone(40°C~45°C).

(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 100~240V,

50/60Hz. (5) The receiver must be operated for about 5 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) OSD display and screen display PATTERN MODE.

- Set is activated HEAT run without signal generator in this mode.

- 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.

PCB assembly Adjustment Method

Caution: Using ‘power on’ button of the control R/C, power on TV.

[ ADC Calibration Protocol (RS232)

- Baud rate : 115200 bps

- RS232 Host : PC

- echo : none

3. ADC Adjustment

3-1. Adjustment of AV(CVBS)

O Standard equipment : 802F Pattern Generator. Master

Pattern Generator(MSPG-925, etc) or same product

O Required Equipment

1) Remote controller for adjustment

2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig. 1).

- Model: 202 / Pattern: 65 EC and FC model use PAL-

BGDHI (composite signal)

(1) Input the Video signal: 7 color Bar signal into AV3. (2) Set the PSM to Vivid mode in the Picture menu

(3) Press INSTART key on R/C for adjustment. (4) Press the

G (Vol. +) key operate to set, then it becomes

automatically. Auto-RGB OK means completed adjustment

ADJUSTMENT INSTRUCTION

<Fig. 1> Color Bar Signal

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3-2. Adjustment of Component

O Standard equipment : 802F Pattern Generator. Master

Pattern Generator(MSPG-925, etc) or same product

O Required Equipments

1) Remote controller for adjustment

2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig. 1). ==> Model: 215 / Pattern: 65

(1) Input the Component 720p/50Hz 7 Color Bar(MSPG-

925FS model: 215, pattern: 65) signal into Component.

(2) Set the PSM to Vivid mode in the Picture menu.

(3) Press IN-START key on R/C for adjustment (4) Press the

G (Vol. +) key to operate the set, then it

becomes automatically

(5) Auto-RGB OK means the adjustment is completed

3-3. Adjustment of RGB

O Standard equipment: PC Pattern Generator(VG828,

VG854, 801GF, MSP3240A) or same product

O Required Equipments

1) Remote controller for adjustment

2) MSPG-925FS Pattern Generator (Which has Video Signal: 7 Color Bar Pattern shown in Fig. 1).

(1) Input the PC 1024x768 @ 60Hz 7 color bar (MSPG-

925FS, Model: 3, Pattern: 65) into RGB. (using D-sub to Dsub cable)

(2) Set the PSM to Vivid mode in Picture menu.

(3) Press the IN-START key on R/C for adjustment. (4) Press the

G (Vol. +) key operate To set , then it becomes

automatically. (5) Auto-RGB OK means adjustment is completed. (6) Press the

G (Vol. +) key to operate the set, then it

becomes automatically (7) Auto-RGB OK means the adjustment is completed

3-4. Adjustment of SCART-RGB

O Standard equipment : Master Pattern Generator(MSPG-

925, etc) or same product

O Required Equipments

1) Remote controller for adjustment

2) MSPG-925FS Pattern Generator (Which has Video Signal: 8 Color Bar Pattern shown in Fig. 2). ==> Model: 232/ Pattern: 8

(1) Input the SCART-RGB 8 Color Bar(MSPG-925FS model:

232, pattern: 8) signal into AV1. (using Full Scart Cable)

(2) Set the PSM to Vivid mode in the Picture menu.

(3) Press IN-START key on R/C for adjustment (4) Press the

G (Vol. +) key to operate the set, then it

becomes automatically

(5) Auto-RGB OK means the adjustment is completed

4. Channel Memory Setting Method

Recovery the channel memory by adjust R/C.

You can set channel memory by R/C for adjustment (1) Press ADJ key on R/C for adjustment. (2) Press VOL + key on “Channel Recover”

5. PCMCIA CARD Checking Method

You must adjust DTV ## Channel and insert PCMCIA CARD to socket.

(1) If PCMCIA CARD works normally, normal signals display

on screen. But it works abnormally, “No CA module” words display on screen.

[ Caution : Before power off, input mode must be changed

RF mode.

<Fig. 1> Color Bar Signal

<Fig. 2> 8 Color 16 Step Gray Signal

<Fig. 1> Color Bar Signal

SET Assembly Adjustment Method

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

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

6. 50” POWER PCB Ass’y Voltage Adjustment

(Va, Vs Voltage Adjustment)

6-1. Model Name :50PG6900,50PG6910 6-2. Adjustment Method

(1) Va Adjustment

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)

(2) Vs Adjustment

1) Input signal : RF noise signal

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

terminal to GND pin of P811.

3) After turning VR 951, voltage of D.M.M adjustment as same

as Vs voltage which on label of panel right/top (deviation ; ±0.5V)

7. 42” POWER PCB Ass’y Voltage Adjustment

(Va, Vs Voltage Adjustment)

7-1. Model Name:42PG6900,42PG6910 7-2. Adjustment Method

(1) Va Adjustment

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)

(2) Vs Adjustment

1) Input signal : RF noise signal

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

3) After turning VR 951, voltage of D.M.M adjustment as same as Vs voltage which on label of panel right/top (deviation ; ±0.5V)

8. EDID(The Extended Display Identification Data) / DDC (Display Data Channel) Download

8-1. Required Test Equipment

(1) Adjusting PC with S/W for writing EDID Data.(S/W: EDID

TESTER Ver.2.5) (2) A Jig for EDID Download (3) Cable : Serial(9Pin or USB) to D-sub 15Pin cable, D-sub

15Pin cable, DVI to HDMI cable.

8-2. Setting of Device

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LGE Internal Use Only

<Fig. 3> 50inch Power PCB Assy Voltage adjustment

<Fig. 4> 42inch Power PCB Assy Voltage adjustment

<Fig. 5> Connection Diagram of DDC download

8-3. Preparation for Adjustment

(1) Connect the Set, EDID Download Jig,, PC & Cable (2) Turn on the PC & EDID Download Jig. Set up the S/W

option

(3) Power on the Set

8-4. Sequence of Adjustment

(1) EDID Download

1) Init the data

2) Load the EDID data.(Open File) [Analog file] (for RGB) [Digital file] (for HDMI)

3) Set the S/W to download.

4) Push the “Write Data & Verify” button. And confirm “Yes”

5) If the writing is finished, you will see the ”OK” message. If TV has four HDMI INPUT, you must download four times for each HDMI.

(2) EDID DATA

1) Analog RGB

ⓐ Product ID

ex) Week: ‘03’ ==> ‘03’

Year: ‘2006’ ==> ‘10’

ⓓ Model Name(Hex):

ⓔ Checksum: Changeable by total EDID data.

2) HDMI

ⓐProduct ID

ex) Week: ‘03’ ==> ‘03’

Year: ‘2006’ ==> ‘10’

ⓓ Model Name(Hex):

ⓔ Checksum: Changeable by total EDID data. ⓕ physical address : ex) HDMI 1 : 10, HDMI 2 : 20 ~ HDMI 3 :

[ EDID Download is needed HDMI1~HDMI3.

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LGE Internal Use Only

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Before adjusting White-balance , the AV ADC should be done. If ADC status were “NG”, Need to ADC adjustment.

9. Adjustment of White Balance

9-1. Required Equipment

(1) Remote controller for adjustment (2) Color Analyzer (CS-1000, CA-100,100+,CA-210 or same

product ) : CH 10 (PDP) [ Please adjust CA-210, CA-100+ by CS-1000 before

measuring

(3) Auto W/B adjustment instrument(only for Auto adjustment) (4) AV Pattern Generator (5) 15 Pin D-Sub Jack(RGB) is connected to the AUTO W/B

EQUIPMENT.

9-2. AUTO White Balance Process.

Adjust Process will start by execute I2C Command (Inner pattern (0xF3, 0xFF)).

O Color temperature standards according to CSM and Module

O CS-1000/CA-100+/CA-210(CH 10) White balance

adjustment coordinate and color temperature

9-3. Manual W/B Process

(using adjusts Remote control)

(1) After enter Service Mode by pushing “ADJ” key, (2) Enter White Pattern off of service mode, and change off ->

on.

(3) Enter “W/B ADJUST” by pushing “

G” key at “3. W/B

ADJUST”.

PC (for communication through RS-232C) ==> UART Baud rate : 115200 bps

9-4. 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 IN-START —> Enter the mode of White-Balance, the pattern will come out.

[ 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. Measure and adjust after sticking the Color Analyzer (CA-100+, CA210 ) to the side of the module.

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

O Auto adjustment Map(I2C)

(1) I2C (100K BPS)

(2) COMMUNICATION START

#Until ACK BIT goes LOW, Repeat it.

(3) Command form.

Command form use DDC2AB standard communication protocol.

a. LEN: DATA BYTE number to send. b. CMD: Command language that monitor executes. c. VAL: FOS DATA d. CS: Dada’s CHECHSUM that transmit e. DELAY: 50MS f. A: Acknowledge

<Fig. 6> Connection Diagram of Auto W/B Adjustment

(4) Adjustment Commands (LENGTH = 84)

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LGE Internal Use Only

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LGE Internal Use Only

(5) EEPROM DATA READ

1) Signal TABLE

2) Command Set

To read the appointment Address of E2PROM by 128(80h)

-byte

(6) EEPROM Data Write(serial number D/L)

1) Signal TABLE

CMD : 8Eh LENGTH : 84h+Byte ADH : E2PROM Slave Address (A0, A2, A4, A6, A8),

Not 00h (Reserved by Buffer To EEPROM) ADL : E2PROM Sub Address (00~FF) Data : Write data CS : CMD + LENGTH + ADH + ADL + Data_1 + ... +

Data_n

2) Command Set

* Description

FOS Default write : <7mode data> write Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0, Phase Data write : Model Name and Serial Number write in EEPROM,.

Delay : 20ms

3) Command Set

* Description

FOS Default write : <7mode data> write Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0, Phase Data write : Model Name and Serial Number write in EEPROM,.

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LG 42pg6900 schematic

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