LG 32PC51 Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PP78C

MODEL : 32PC51 32PC51-ZB

aNorth/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

TROUBLE SHOOTING............................................................................13

BLOCK DIAGRAM...................................................................................20

EXPLODED VIEW .................................................................................. 22

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 the 32” PLASMA TV used PP78C 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 General Specification ( 32”WVGA )

Display Screen Device Aspect Ratio PDP Module

Operating Environment

Storage Environment

Input Voltage

1 2 3

No Item Specification Remark

32” Wide Color Display Module 16:9 PDP32F1, RGB Closed Type

1)Temp. : 0~40deg

2)Humidity : 0~85%

3)Temp. : -20~60deg

4)Humidity : 0~85% 100-240V~, 50/60Hz

Plasma Display Panel

Glass Filter

LGE SPEC.

Maker : LG

Chassis

PP78C 32PC51-ZB EU LG

ITOLess Model

Model Name Market Brand Remark

32PC51-ZB Safety : IEC/EN60065,

EMI : EN55013, EMS : EN55020

Model ApplianceMarket

ITOLess Model

Remark

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Only for training and service purposes

V General Specification2

Market Broadcasting system Available Channel

Receiving system SCART Jack(2EA) Component Input (1EA) RGB Input(1EA) HDMI Input(1EA) Audio Input (4EA) Audio variable out(1EA)

1 2 3

4 5 6 7 8 9

No Item Specification Remark

EU PAL-BG/I/DK, SECAM BAND PAL NTSC VHF/UHF C1~C69 2~83 CATV S1~S47 1~71 Upper Heterodyne PAL, SECAM, NTSC Y/Cb/Cr, Y/Pb/Pr RGB-PC HDMI-DTV PC Audio, Component(1EA),

Full SCART, Half SCART

HDMI PC spec out L/R Input

Display area Outline dimension Number of Pixels Cell pitch Pixel type Weight(net) Weight(gross) Operation Environment Temperature

Humidity Pressure

Storage Environment Temperature

Humidity Pressure

I mage stick minimization Start time

mode Low Brightness

Arrival Time

708.0.1(H) x 398.4(V) ± 0.5mm 790(H) x 466.5(V) x 59.1(D) ± 1mm 852(H) x 480(V) 831um(H) x 830um(V) RGB closed type

7.55 8.05 8.55

118.5 123.5 128.5 0 ~ 40 20 ~ 80 800 ~ 1100

-20 ~ 60 10 ~ 90

700 ~ 1100

4.5 5 5.5 14 15 16

1 2 3 4 5 6 7 8

No Item Remark

1Pixel=3RGB Cells 1Pixel=3RGB Cells

12 1Box

Altitude : 0 to 2000M

Altitude : 0 to 3000M

mm mm

Kg Kg

deg

% hPa deg

% hPa min min

Min Typ Max Unit

V Module Specification ( PDP32F1 )

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Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Object

These instructions are applied all of the 32” PLASMA TV,

PP78C Chassis.

2. Note

(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 100-220V~,

50/60Hz. (5) Before adjustment, execute Heat Run for 30 minutes.

3. Adjustment items

3.1. PCB assembly adjustment items

(1) Download the VCTP main software (IC500,VCT_Pro) (2) Color carrier Adjustment

3.2. SET assembly adjustment items

(1) DDC Data input. (2) Adjustment of White Balance. (3) Factoring Option Data input.

4. PCB assembly adjustment method

(Using VCTP Download program)

4-1. Download program installation

(1) Extract a Zip file.

(2) Visual I2C & LPT Driver Installation.

LPT Port Driver (LptDrv) Setups : Program Files > Micronas >

Visual I2C > Port_Driver *Use for Windows 95/98 : Setup_LptDrv_v0104_9x.exe *Use for Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe *

Use for Windows NT : Setup_LptDrv_v0104_NT.exe

(3) Verification.(Start > Programs > Micronas > Visual I2C or

LptDrv)

(4) LPT delay setting.(File > Preference > LPT preferences)

(5) Exchange the “bootloader.bat” file.

Install the LPT Driver Install the Visual I2C

*LPT SETTING

- Delay => 1

- Time out => 500 ms

Double click the Red area

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Only for training and service purposes

G Select the "Bootloader.bat" file.

(install > VCTP_download > Bootloader)

G Push "OK".

Finish the program, after saving the file "download_cs.vi2c".

(if you click , the massage appears automatically)

5. S/W program download

5-1. Download method 1 (PCB Ass’y)

(1) Connect the download jig to D-sub jack. (2) Execute ‘Download.vi2c’ program in PC, then a main

window will be opened.

(3)

Double click the blue box and confirm "Bootloader Version" as 42.

(4) Click the "Erase Flash" button.

(5) Double click the download file low, then "edit" window will

be opened.

(6) Click the choice button in the “edit window”, then “file

choice window” will be opened.

(7) Choose the Hex file in folder and execute downloading

with click " open" button.

(8) Click OK button at the "edit window". (9) Under Downloading process.

(10) If download is failed, for example "No acknowledge from

slave". Execute download again from(1).

Shortcut to download

Double click

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Only for training and service purposes

5-2.Download method 2 (Set)

(1) Push the “Tilt” button in an Adjust Remocon Then the

PLASMA TV will change a “slave mode”.

(2) Connect Zig to TV using a D-sub cable.

(3) Execute ‘Download_CS.vi2c’ program in PC, then a main

widow will be opened.

(4) Click "GO" button.

If you don’t push the “go”, the Hex file would not be

downloaded although the download proceeds normally at first glance.

(5) Double click the blue box and confirm "Bootloader Version"

as 42.

(6) Click the "Erase Flash" button.

(7) Double click the download file low then, "edit" window will

be opened.

(8) Chick the choice button I n the "edit window", then "file

choice window’ will be opened.

(9) Click the “load > flash” button.

(10) Click OK button at the "edit window".

(11) Under Downloading progress.

(12) If download is failed, for example "No acknowledge from

slave", execute download again from (1).

Shortcut to download_cs

Double click

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