LG 50PQ60D-AA Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PA91A

MODEL : 50PQ60D 50PQ60D-AA

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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Only for training and service purposes

CONTENTS

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

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

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

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

BLOCK DIAGRAM ...................................................................................................................10

EXPLODED VIEW ....................................................................................................................11

SVC. SHEET ................................................................................................................................

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

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Only for training and service purposes

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 Exploded View. 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 isolation 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 circuitry 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 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 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 exposed 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 specified, 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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Only for training and service purposes

SPECIFICATIONS

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

V Application Range

This spec is applied to 42”/50” PDP TV used PA91A 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 : CB specification EMC : CISPR 13 specification

V Module Specification

(1) 50”

Chassis

PA91A 50PQ60D-AA

42PQ60D-AA 50PQ20D-AA 42PQ20D-AA

Australia LG

Model Name Market Brand Remark

Model Name 50PQ60D-AA 42PQ60D-AA 50PQ20D-AA 42PQ20D-AA

Remark

Safety : IEC60065,

EN60065

EMC : CISPR 13 Class B

Market

Australia

Appliance

TEST

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 PDP50XG2####, RGB Closed Type

1) Temp. : 0 ~ 40deg

2) Humidity : 20 ~ 80%

3) Temp. : -20 ~ 60deg

4) Humidity : 10 ~ 90% AC100-240V~, 50/60Hz

PDP

LGE SPEC.

Maker: LG

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Only for training and service purposes

(2) 42”

V Model General Specification

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 PDP42XG2####, RGB Closed Type

1) Temp. : 0 ~ 40deg

2) Humidity : 20 ~ 80%

3) Temp. : -20 ~ 60deg

4) Humidity : 10 ~ 90% AC100-240V~, 50/60Hz

PDP

LGE SPEC.

Maker: LG

Market Broadcasting system

Receiving system

Video Input (1EA) S-Video Input (1EA) Component Input (2EA) RGB Input(1EA) HDMI Input(3EA) Audio Input (5EA)

Audio Out(1EA) USB(1EA)

1 2

4 5 6 7 8 9

10 11

No Item Specification Remark

Australia

1) PAL-BG

2) DVB T Analog : Upper Heterodyne Digital : COFDM PAL, NTSC PAL, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC HDMI-DTV & SOUND PC Audio, Component(2EA), AV(2EA)

SPDIF(1EA) Divx, MP3, JPEG

L/R Input(PC 1EA, SIDE AV 1EA, Component 2EA, Rear AV 1EA)

DIVX, MP3, JPEG ONLY FOR PQ60

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Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Range

This spec sheet is applied all of the PDP TV, PA91A 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±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 when module is in the circumstance of over

15°

- In case of keeping module is in the circumstance of 0°C, it should be placed in the circumstance of above 15°C for 2 hours

- In case of keeping module is in the circumstance of below

-20°C, it should be placed in the circumstance of above 15°C for 3 hours,.

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.

* Single color pattern (WHITE) 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.

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

TV.

O Auto-control adjustment protocol(RS-232C)

3. Insert Tool OPTION and Model Name Download

(1) Press IN_START key on R/C to insert Tool OPTION (2) On the “Tool Option 1”, Insert Tool Option by a number

key

(3) Press the ENTER(

(4) Press ENTER(

V) again.

(5) Select “OK to Download” by using

F/G(VOL +/-) and press

G(VOL +)

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Only for training and service purposes

4. EDID(The Extended Display Identification Data) Download

(1) Press the ADJ KEY on R/C and enter EZ ADJUST. (2) Select “5.EDID D/L” by using

D/E(CH +/-) and press

ENTER(

V).

(3) Select “Start” and press navigation key(

G).

(4) EDID download is executed automatically. (5) Press EXIT key on R/C

(6) EDID DATA

1) Analog RGB

ⓐ Product ID

ⓑ Week, Year

=> Controlled on production line:

ex) Week: ‘03’ -> ‘03’

Year: ‘2006’ -> ‘10’

ⓓ Checksum: Changeable by total EDID data.

2) HDMI

ⓐ Product ID

ⓑ Week, Year

=> Controlled on production line:

ex) Week: ‘03’ -> ‘03’

Year: ‘2006’ -> ‘10’

ⓓ Checksum: Changeable by total EDID data.

ⓔ Vender ID

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Only for training and service purposes

5. ADC Adjustment

5-1. Adjustment of RGB

Auto RGB Gain/Offset Adjustment

(1) Convert to PC in Input-source. (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)

3) Adjust by commanding AUTO_COLOR_ADJUST

5-2. Adjustment of COMPONENT

Component Gain/Offset Adjustment

(1) Convert to Component in Input-source. (2) Signal equipment displays

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

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

5-3. Confirmation

Press ‘InStart’ Key on Factory SVC Remote Controller, It is possible to check ADC & EDID ADJ

Caution: Each PCB assembly must be checked by check JIG

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

6. POWER PCB Assembly Voltage Adjustment

(Va, Vs voltage Adjustment)

6-1. Test Equipment:D.M.M 1EA 6-2. Connection Diagram for Measuring:

Refer to fig.1

6-3. Adjustment Method

(1) Va adjustment

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

2) 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) 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)

7. Download Serial Number (RS-232C)

(1) Press “Power on” key of service R/C.(Baud rate : 115200

bps)

(2) Connect RS232 Signal Cable to RS-232 Jack. (3) Write Serial number by use RS-232. (4) Must check the serial number at the Diagnostics of SET

UP menu. (Refer to below ‘6.SET INFORMATION’).

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