LG 42PT250U-UA Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PU14K

MODEL : 42PT250U 42PT250U-UA

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

Internal Use Only

Printed in Korea

P/NO : MFL67002604(1103-REV00)

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Only for training and service purposes

CONTENTS

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

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

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

ADJUSTMENT INSTRUCTION ..................................................................................................7

BLOCK DIAGRAM ...................................................................................................................12

EXPLODED VIEW ..................................................................................................................13

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

SPECIFICATION

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

1. Application Range

(1) This spec sheet is applied all of PDP TV with PU14K chassis. (2) Not included spec and each product spec in this spec sheet apply correspondingly to the following each country

2. Specification

Each part is tested as below without special appointment. (1) Temperature : 20 °C ± 5 °C (2) Relative Humidity : 65 % ± 10 % (3) Power Voltage : Standard input voltage (100 V ~ 240 V @ 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

BOM.

(5) The receiver must be operated for about 5 minutes prior to the adjustment.<-DQA Request

3. Test Method

(1) Performance : LGE TV test method followed. (2) Demanded other specification

Safety : UL, CSA, IEC,CE specification EMC : FCC, ICES, IEC, CE specification

Model Name

42PT250U-UA

Remark

Safety : UL1492, CSA C22.2.No.1

EMC : FCC Class B, IC Class B

Market

NORTH AMERICA

Model Name

42PT250U-UA

Brand

Market

NORTH AMERICA

Remark

PDP 42T3N

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Only for training and service purposes

4. General Specification

No Item Specification Remark

1. Receiving System 1) ATSC/64 & 256 QAM/ NTSC-M

2. Available Channel 1) VHF : 02~13

2) UHF : 14~69

3) DTV : 02-69

4) CATV : 01~135

5) CADTV : 01~135

3. Input Voltage 1) AC 100 V ~ 240 V 50/60Hz

2) AC 100 V ~ 120 V 50/60Hz

4. Market NORTH AMERICA

5. Screen Size 106 cm (42 inch) Wide(1024 × 768) 42T3N

127 cm (50 inch) Wide(1024 × 768) 50T3N 127 cm (50 inch) Wide(1920 × 1080) 50R3 152 cm (60 inch) Wide(1920 × 1080) 60R3

6. Aspect Ratio 16:9

7. Tuning System FS

8. PDP Module PDP42T3#### (1024 × 768) PDP50T3#### (1024 × 768) PDP50R3#### (1920 × 1080) PDP60R3#### (1920 × 1080)

9. Operating Environment 1) Temp : 0 deg ~ 40 deg

2) Humidity : ~ 80 %

10. Storage Environment 1) Temp : -20 deg ~ 60 deg

2) Humidity : 0 % ~ 85 %

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Only for training and service purposes

5. Chroma

(1) 42T3N, 50T3N, 50R3, 60R3 Module

No Item Min Typ Max Unit Remark

1 Color White X 0.270 0.285 0.300 08.11.20 Xrange change +-0.015

coordinate Y 0.283 0.293 0.303 09.10.13 blue Y Change

Red X 0.635 0.640 Unlimitedness 0.065~0.075

Y 0.318 0.330 0.345 - White : 85IRE(216Gray) 100%

Green X 0.242 0.300 0.305 100% Window White Pattern

Y 0.595 0.600 Unlimitedness - R/G/B : 100IRE(255Gray)

Blue X Unlimitedness 0.150 0.158

100% Window White Pattern

Y Unlimitedness 0.065 0.075

- Picture: Vivid(Medium )

- 100% Window

- 85IRE 100% Window White

2 Color coordinate uniformity -0.020 average +0.020 Pattern

- Picture: Vivid(Medium)

3 Color

Cool 0.261 0.276 0.291

- White : 85IRE(216Gray) 100%

Temperature

0.268 0.283 0.298

Window White Pattern

Medium 0.270 0.285 0.300

- 100% Window

0.278 0.293 0.308

08.11.20 range change +-0.015

Warm : ColorGamut => WIDE

Warm

0.298

0.313 0.328

Cool:Color temperature C30

0.314 0.329 0.344

Meduum:Color temperature 0

Warm:Color temperature W30

- - 85IRE(216Gray) 100% Window

4 Brightness uniformity -10 0 +10 % White Pattern

- Picture: Vivid(Medium)

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Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Range

This spec sheet is applied to all of the PU14K 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 cC ± 5 cC of temperature and 65 % ± 10 % of relative

humidity if there is no specific designation. (4) The input voltage of the receiver must keep

100 V ~ 240 V, 50 / 60 Hz.

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

the adjustment when module is in the circumstance of over

15 cC

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

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

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

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

select “White” by using

F/G(VOL +/-)

- 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.

V Adjustment list

PCB assembly adjustment method

- ADC Adjustment

- DDC EDID Write Confirmation

V Total assembly line process

- POWER PCB Ass’y Voltage adjustment

- Adjustment of White Balance

- RS-232C

- OPTION

- Outgoing condition Configuration

- Internal pressure

3. PCB assembly adjustment method

* Caution: Set up “RF mode(noise)” after PCB assembly

adjustment.

*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.

(1)

(3)

(2) OK

Please Check the Speed : To use speed between from 200KHz to 400KHz

(4)

filexxx.bin

(5)

(6)

(7) ÉÉÉ.OK

4. ADC Process

4-1. Auto ADC Process (using DFT)

PC (for communication through RS-232C) UART Baud rate : 115200 bps Command : aa 00 00 (Start factory mode) Command : ad 00 10 (working Auto ADC) Command : aa 00 90 (End of Auto ADC Process)

4-2. 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”.

4-3. 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,

5. DDC EDID Write Confirmation

6. Total Assembly line process

* 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.

6-1. POWER PCB Ass’y Voltage

adjustment (Va, Vs voltage adjustment)

(1) Test equipment : D.M.M 1EA (2) Connection Diagram for Measuring : refer to fig.1

(fig.1 : Power PCB Assy Voltage adjustment)

6-2. Adjustment method

(1) Vs adjustment (refer fig.1)

1) Connect + terminal of D.M.M. to Vs pin of P812(42”:P811), connect -terminal to GND pin of P812(42”:P811)

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

(2) 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 P812(42”:P811), connect -terminal to GND pin of P811(42”:P812).

3) After turning VR502,voltage of D.M.M adjustment as same as Va voltage which on label of panel left/top (deviation; ±0.5V)

7. DDC EDID Write

MODEL NAME: LG TV (Not necessary)

Caution: Please only check write status in Instart-menu

7-1. Manual Download(using DFT)

PC(for communication through RS-232C), UART baud rate: 115200 bps Command : aa 00 00 (Start Factory mode) Command : ae 00 10 (Download All EDID) Command : aa 00 90 (End of Factory mode)

7-2. Manual EDID D/L using Service Remocon

(1) After enter Service Mode by pushing “ADJ” key, select “4.

EDID D/L”.

(2) Finally execute “START” by pushing “

G” or “9”key.

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Only for training and service purposes

< XPOWER4 42T3 PSU >

7-3 HD EDID DATA

RGB EDID DATA

HDMI-1 EDID DATA

HDMI-2 EDID DATA

HDMI-3 EDID DATA

8. Adjustment of White Balance

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

8-1. 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

8-2. 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.

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Only for training and service purposes

0.0030.0030.003

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

3uv

0.329±0.0020.329±0.0020.329y

0.313±0.0020.313±0.0020.313x

CA-210 (CH.10)CA-100+ (CH.10)CS-1000Warm

0.0000.0000.0003uv

0.293±0.0020.293±0.0020.293y

0.285±0.0020.285±0.0020.285x

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

Medium

0.0000.0000.0003uv

0.283±0.0020.283±0.0020.283y

0.276±0.0020.276±0.0020.276x

CA-210 (CH.10)CA-100+ (CH.10)CS-1000Cool

Target luminance 65

Range 20

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Only for training and service purposes

8-3. 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 5 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)

8-4. Manual white Balance

(1) Press the POWER ON KEY on R/C for adjustment and

heat run over 5 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 “3.W/B ADJUST” and press ENTER(

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-offset / G-offset / B-offset is set to 128

- Control R-Gain and G-Gain.

- Each gain is limited to 192

< Temperature: MEDIUM >

- R-offset / G-offset / B-offset is set to 128

- Control R-Gain and G-Gain.

- Each gain is limited to 192

< Temperature: WARM >

- R-offset / G-offset / B-offset is set to 128

- Control G-Gain and B-Gain.

- Each gain is limited to 192

9. HDCP SETTING(Not necessary)

Caution: Key is saved in external eeprom.

10. RS-232C

Press In-start key and select 4.Baud Rate menu. Check RS232C after changing Baud Rate 115200.

11. TOOL OPTION

11-1. Using DFT(Auto)

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

Command : ab 00 00 DATA(Model Number(hexadecimal))

11-2. Setting Manual

Press ADJ R/C In-start key and select 0.TOOL OPTION, Select Model Number by using R/C number(0~9) key or select Model Number by using

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

destination. Finally press

9 (enter) key.

RS-232C COMMAND

CENTER

[CMD ID DATA] MIN (DEFAULT) MAX

Cool Mid Warm Cool Mid Warm

R Gain jg Ja jd 00 192 192 192 255

G Gain jh Jb je 00 192 192 192 255

B Gain ji Jc jf 00 192 192 192 255

R Cut 128 128 128 255

G Cut 128 128 128 255

B Cut 128 128 128 255

ITEM DATA(Model Number) Model

TOOL OPTION 3 50PT35*-U*

4 42PT35*-U*

6 50PV45*-U*

8 60PV45*-U*

12 42PT35*-U*

13 50PT33*-U*

14 50PV40*-U*

15 60PV40*-U*

16 50PV43*-U*

17 60PV43*-U*

18 42PT20*-U*

19 50PT20*-U*

20 42PT25*U-U*

21 50PT25*U-U*

22 50PV55*U-U*

23 60PV55*U-U*

30 Z42PT32*-U*

31 Z50PT32*-U*

32 Z50PV22*-U*

33 Z60PV22*-U*

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Only for training and service purposes

12. AREA OPTION

12-1. Using DFT(Auto)

PC (for communication through RS-232C) ==> UART Baud rate : 115200 bps Command : ah 00 00 DATA(Area Number(hexadecimal))

12-2. Setting Manual

Press ADJ R/C In-start key and select 1.AREA OPTION, Select Model Number by using

F/G(VOL +/-) in accordance

with destination

12-3. Outgoing condition Configuration

- After all function test, press IN-STOP Key by SVC Remote controller. And Make Ship Condition.

- When pressing IN-STOP key by SVC remocon, Red LED are blinked alternatively. And then Automatically turn off. (Must not AC power OFF during blinking)

12-4. Internal pressure

Confirm whether is normal or not when between power board's ac block and GND is impacked on 1.5kV(dc) or

2.2kV(dc) for one second

13. Default Service option.

13-1. ADC-Set.

V R-Gain adjustment Value (default 128) V G-Gain adjustment Value (default 128) V B-Gain adjustment Value (default 128) V R-Offset adjustment Value (default 64) V G-Offset adjustment Value (default 64) V B-Offset adjustment Value (default 64)

13-2. White balance.

CENTER (DEFAULT) MAX

Cool Mid Warm

R Gain 184 192 192 255

G Gain 189 184 150 255

B Gain 192 161 128 255

R Cut 128 128 128 255

G Cut 128 128 128 255

B Cut 128 128 128 255

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Only for training and service purposes

BLOCK DIAGRAM

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LGE Internal Use Only

EXPLODED VIEW

900

910

203

590

204

601

207

520

400

200

240

580

301

305

120

300

206

202

205

302

303

304

501

602

201

570

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.

IMPORTANT SAFETY NOTICE

A10

LV1

A12

A21

LGE Internal Use Only

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