LG 32PC5DVC Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PP78D

MODEL : 32PC5DVC 32PC5DVC-UG

CANADA : http//biz.lgservice.com
USA : http//www.lgservice.com

: http//biz.lgservice.com

Internal Use Only

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Copyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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 same specified type.

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.

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

CANADA: LG Electronics Canada, Inc. 550 Matheson

Boulevard East Mississauga, Ontario L4Z 4G3

USA : LG Customer Interactive Center

P.O.Box 240007, 201 James Record Road Huntsville,
AL 35824
Digital TV Hotline [phone]

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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Copyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

SPECIFICATIONS.................................................................4

ADJUSTMENT INSTRUCTIONS ..........................................5

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

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

EXPLODED VIEW PARTS LIST.........................................12

SCHEMATIC DIAGRAM..........................................................

PRINTED CIRCUIT BOARDS.................................................

TABLE OF CONTENTS

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Copyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

The specifications shown above may be changed without prior notice for quality improvement.

32PC5DVC

(32PC5DVC-UG)

MODELS

32.3 x 23.8 x 10.1 inches

819.9 x 603.8 x 255.4 mm

32.3 x 21.8 x 3.1 inches

819.9 x 554.2 x 78.1 mm

36.8 pounds / 16.7 kg

34.8 pounds / 15.8 kg

AC100-240V ~ 50/60Hz

NTSC-M, ATSC, 64 & 256 QAM

VHF 2-13, UHF 14-69, CATV 1-135, DTV 2-69, CADTV 1-135

75 ohm

32 ~ 104°F (0 ~ 40°C)

Less than 80%

-4 ~ 140°F (-20 ~ 60°C)
Less than 85%

Dimensions
(Width x Height x Depth)

Weight

Power requirement
Television System
Program Coverage
External Antenna

Impedance

Environment condition

Including stand

Excluding stand

including stand
excluding stand

Operating
Temperature

Operating Humidity

Storage Temperature
Storage Humidity

SPECIFICATIONS

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Copyright©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

ADJUSTMENT INSTRUCTIONS

1. Application Range

This spec sheet is applied to all of the PP78D 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 to protect test instruments.
(2) Adjustment must be done in the correct sequence.
(3) The adjustment must be performed at 25±5°C temperature

and 65±10% relative humidity if there is no specified

designation.
(4) The input voltage of the receiver must be kept between

100~220V, 50/60Hz.
(5) Before adjustment, execute Heat-Run for 30 minutes at RF

no signal.

3. ADC Calibration

3-1. PC input ADC

(1) Auto RGB Gain/Offset Adjustment

1) Convert to PC in Input-source

2) Signal equipment displays
Output Voltage : 700 mVp-p
Impress Resolution XGA (800 x 600 @ 60Hz)
Model : 46 in Pattern Generator
Pattern : 29 in Pattern Generator (MSPG-925 SERISE)
[gray pattern that left & right is black and center is white
signal (Refer below picture)]

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)
0x00 0x02 instruction.

(2) Confirmation

1) We confirm whether “0xB6(RGB)” address of EEPROM
“0xA2” is “0xAA” or not.

2) If “0xB6(RGB)” address of EEPROM “0xB2” isn’t “0xAA”,
we adjust once more

3) We can confirm the ADC values from
“0xB0~0xB5(RGB)” addresses in a page “0xA2”

[ Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust”
by pushing “

G” key at “Adjust-RGB”.

3-2. COMPONENT input ADC

(1) Component Gain/Offset Adjustment

1) Convert to Component in Input-source

2) Signal equipment displays

Impress Resolution 720P
MODEL : 216 in Pattern Generator(720P Mode)
PATTERN : 08 in Pattern Generator(MSPG-925 SERISE)

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)
0x00 0x02 instruction

(2) Confirmation

1) We confirm whether “0xC8(720P)” address of EEPROM
“0xA2” is “0xAA” or not.

2) If “0xC8(720P)” 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”

MSPG-

925FA

Component

Model: 216

(720p@60Hz)

Model: 46

(800x600@60Hz)

RGB

Adjustment pattern (PC)

Adjustment pattern (COMPONENT)