LG 50PQ60D-AA Schematic

		Internal Use Only

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PLASMA TV

SERVICE MANUAL

CHASSIS : PA91A

MODEL : 50PQ60D 50PQ60D-AA

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTS

CONTENTS ...............................................................................................................................	2
SAFETY PRECAUTIONS ...........................................................................................................	3
SPECIFICATION.........................................................................................................................	4
ADJUSTMENT INSTRUCTION ..................................................................................................	6
BLOCK DIAGRAM ...................................................................................................................	10
EXPLODED VIEW ....................................................................................................................	11
SVC. SHEET ................................................................................................................................
PRINTED CIRCUIT DIAGRAM.....................................................................................................

Copyright©2009 LG Electronics. Inc. All right reserved.	- 2 -	LGE Internal Use Only
Only for training and service purposes

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

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	Leakage Current Hot Check (See below Figure)
	Plug the AC cord directly into the AC outlet.

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.

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.

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 circuit

AC Volt-meter

To Instrument's

Good Earth Ground such as WATER PIPE, CONDUIT etc.

exposed METALLIC PARTS

0.15uF

1.5 Kohm/10W

Copyright©2009 LG Electronics. Inc. All right reserved.	- 3 -	LGE Internal Use Only
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.

Chassis	Model Name	Market	Brand	Remark

PA91A	50PQ60D-AA	Australia	LG
	42PQ60D-AA
	50PQ20D-AA
	42PQ20D-AA

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.

VTest Method

1)Performance : LGE TV test method followed.

2)Demanded other specification

Safety	: CB specification
EMC	: CISPR 13 specification

	Model Name	Market	Remark	Appliance

	50PQ60D-AA	Australia	Safety : IEC60065,	TEST

	42PQ60D-AA		EN60065

	50PQ20D-AA
	42PQ20D-AA		EMC : CISPR 13 Class B
	42PQ20D-AA

VModule Specification

(1)50”

No	Item		Specification	Remark

1	Display Screen Device	50 inch wide Color Display Module		PDP

2	Aspect Ratio	16:9

3	PDP Module	PDP50XG2####,
		RGB Closed Type

4	Operating Environment	1)	Temp. : 0 ~ 40deg
		2)	Humidity : 20 ~ 80%	LGE SPEC.

5	Storage Environment	3)	Temp. : -20 ~ 60deg
		4)	Humidity : 10 ~ 90%

6	Input Voltage	AC100-240V~, 50/60Hz		Maker: LG

Copyright©2009 LG Electronics. Inc. All right reserved.	- 4 -	LGE Internal Use Only
Only for training and service purposes

(2) 42”

No	Item		Specification	Remark

1	Display Screen Device	42 inch wide Color Display Module		PDP

2	Aspect Ratio	16:9

3	PDP Module	PDP42XG2####,
		RGB Closed Type

4	Operating Environment	1)	Temp. : 0 ~ 40deg
		2)	Humidity : 20 ~ 80%	LGE SPEC.

5	Storage Environment	3)	Temp. : -20 ~ 60deg
		4)	Humidity : 10 ~ 90%

6	Input Voltage	AC100-240V~, 50/60Hz		Maker: LG

V Model General Specification

No	Item	Specification	Remark

1	Market	Australia

2	Broadcasting system	1) PAL-BG
		2) DVB T

3	Receiving system	Analog : Upper Heterodyne
		Digital : COFDM

4	Video Input (1EA)	PAL, NTSC

5	S-Video Input (1EA)	PAL, NTSC

6	Component Input (2EA)	Y/Cb/Cr, Y/Pb/Pr

7	RGB Input(1EA)	RGB-PC

8	HDMI Input(3EA)	HDMI-DTV & SOUND

9	Audio Input (5EA)	PC Audio, Component(2EA), AV(2EA)	L/R Input(PC 1EA, SIDE AV 1EA,
			Component 2EA, Rear AV 1EA)

10	Audio Out(1EA)	SPDIF(1EA)

11	USB(1EA)	Divx, MP3, JPEG	DIVX, MP3, JPEG ONLY FOR PQ60

Copyright©2009 LG Electronics. Inc. All right reserved.	- 5 -	LGE Internal Use Only
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(V)

(4)Press ENTER(V) again.

(5)Select “OK to Download” by usingF/G(VOL +/-) and press G(VOL +)





Copyright©2009 LG Electronics. Inc. All right reserved.	- 6 -	LGE Internal Use Only
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 usingD/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

O Detail EDID Options are below ( , , , )

Product ID

Week, Year

=> Controlled on production line: ex) Week: ‘03’ -> ‘03’

Year: ‘2006’ -> ‘10’

Model Name(Hex)

Checksum: Changeable by total EDID data.

2) HDMI

O Detail EDID Options are below ( , , , , )

Product ID

Week, Year

=> Controlled on production line: ex) Week: ‘03’ -> ‘03’

Year: ‘2006’ -> ‘10’

Model Name(Hex)

Checksum: Changeable by total EDID data.

Vender ID

Copyright©2009 LG Electronics. Inc. All right reserved.	- 7 -	LGE Internal Use Only
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)

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’).

5-3. Confirmation

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




Copyright©2009 LG Electronics. Inc. All right reserved.	- 8 -	LGE Internal Use Only
Only for training and service purposes

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