Philips LC320WXD, LC320WXN, LC420WUE, LC420WUF, LC420WXE Service Manual

Published by MW 0868 BU TV Consumer Care Printed in the Netherlands Subject to modification EN 3122 785 17782

©

Copyright 2008 Koninklijke Philips Electronics N.V.
All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system or transmitted, in any form or by any means, electronic,
mechanical, photocopying, or otherwise without the prior permission of Philips.

Colour Television Module

LPL (LG Philips LCD) LCD 2k8

LC320WXD, LC320WXN

LC370WUF, LC370WXE

LC420WUE, LC420WUF, LC420WXE

LC470WUE, LC470WUF

Contents Page

1. Technical Specifications, Connections, and Chassis
Overview 2

2. Safety Instructions, Warnings, and Notes 4

3. Directions for Use 5

4. Mechanical Instructions 6

5. Service Modes, Error Codes, and Fault Finding 18

6. Block Diagrams, Test Point Overviews, and
Waveforms 20

7. Circuit Diagrams and PWB Layouts 20

8. Alignments 20

9. Circuit Descriptions, Abbreviation List, and IC Data
Sheets 20

10. Spare Parts List 20

11. Revision List 20

Technical Specifications, Connections, and Chassis Overview

EN 2 LCD LPL 2k81.

1. Technical Specifications, Connections, and Chassis Overview

Index of this chapter:

1.1 Introduction

1.2 General

1.3 Specifications

Note:

• Specifications are indicative (subject to change).

1.1 Introduction

In this Service Manual you will find all necessary information to
perform the Board Level Repair (= board swap) scenario on
LCD panels. These LCD repair manuals are created per brand,
and they will contain all necessary information for the different
panels used in Philips flat LCD TVs.

1.2 General

Figure 1-1 LPL board labelling

H_16890_024.eps

230507

Number of order progress.

The Marking position could be different each model of T-Con or inverter P/N.

This picture is different from origin model.
Please Use it only as a reference.

Case 1

Case 2

(Master)

(Slave)

T-CON Board

Inverter

Technical Specifications, Connections, and Chassis Overview

EN 3LCD LPL 2k8 1.

Figure 1-2 LPL model numbering

1.3 Specifications

Below find attached the data sheets of the different LCD
panels. Click on the “model number” to open.

• LC320WXD-SAB1

• LC320WXN-SAB1

• LC370WUF-SAB1

• LC370WXE-SAA1

• LC420WUE-SAA1

• LC420WUF-SAA1

• LC420WUF-SAC1

• LC420WXE-SAA1

• LC470WUE-SAA1

• LC470WUF SAA1

• LC470WUF-SAC1

LPL ଶ L ଷ

Model

Model

ྙྚྛ೸ ྜ ೶ྜྷ ྞྟྠྡ

ྡྷྣ ྤ

LC4 2 0W X 2

ྥ

A

ྦྷྦ

Product Type

-.C : T.V

-.M : Monitor

-.P : Note Book

-.S : Smart Panel

-.N : Navigation

Panel Size.

-. 019೸1.94”, 141೸14.1”,

-. 181೸18.1”, 201೸20.1”,

-. 320೸32”, 42”೸420…

Inch

Resolution

Q - QVGA(320X240)
H - HVGA(320X480)
V - VGA(640X480)
S - SVGA(800X600)
X - XGA(1024X768)
E - SXGA(1280X1024)
U - XGA(1600X1200)
T - QXGA(2048X1536)
F - QSXGA(2560X2048)
G -QUXGA(3200X2400)
W -Wide
J -CIF
N -NTSC
P -PAL
B - NTSC & PAL
C - SECAM
A - NTSC/PAL/SECAM
D -HD

-. 1~99, & AA~ZZ

-. ex) LP141X09,LP141X10
… LP141X99

, LP141XAA,

Development #

T : TN : Twist Numeric

S : IPS : In Plane Switching

A ~ Z
Ex) P1 - ”A”, P2 - ”B”,

P3 - ”C”, P4 – “D”,
P5 - ”E”, P6 - ”F”

P7- ”G”

Display Mode

Product Revision Code

A : Best
A1 : Good
B : Not bed

Quality Grade

VGA 640 x 480

SVGA 800 x 600

XGA 1,024 x 768

SXGA 1,280 x 1,024

SXGA+ 1,400 x 1,050

WSXGA 1,600 x 1,024

WSXGA+ 1,680 x 1,050

UXGA 1,600 x 1,200

UWXGA 1,920 x 1,200

QXGA 2,048 x 1,536

G 3 1S L A 1

16 17 18 19

Product Mechanical Type

Panel Line

Module Factory

Gumi -1
China -2
Paju -3
Poland-4

Revision No

kGaG{{sGaG{T{Gs
{GaG{tkzGaG{Gt¡GkGz
sGaGs}kzGaGsG}GkGz

Basic Model

Basic Model

Suffix1

Suffix1

Suffix2

Suffix2

ఐ Suffix 1 : Distinguishable Display mode, Mechanical & Optical Specification – Revise Spec.
ఐ Suffix 2 : Internal control No - Change sub- parts or process & Only a few change spec.

I_16892_017.eps

310708

Safety Instructions, Warnings, and Notes

EN 4 LCD LPL 2k82.

2. Safety Instructions, Warnings, and Notes

Index of this chapter:

2.1 General

2.2 Safety Precautions

2.3 Servicing Precautions

2.1 General

Notes:

• Only authorised persons should perform servicing of this
module.

• When using/handling this unit, pay special attention to the
LCD Module: it should not be enforced into any other way
then next rules, warnings, and/or cautions.

• "Warning" indicates a hazard that may lead to death or
injury if the warning is ignored and the product is handled
incorrectly.

• "Caution" indicates a hazard that can lead to injury or
damage to property if the caution is ignored and the
product is handled incorrectly.

2.2 Safety Precautions

2.2.1 Warning

• Do not supply a voltage higher than specified to this
product. This may damage the product or can create
hazardous situations.

• Do not use this product in locations where the humidity is
extremely high, where it may be splashed with water, or
where flammable materials surround it.

• Do not install or use the product in a location that does no
satisfy specified environmental conditions. This may
damage the product or can create hazardous situations.

• If a foreign substance (such as water, metal, or liquid) gets
inside the product, immediately turn “OFF” the power.
Continuing to use the product may cause electric shock or
can create hazardous situations.

• If the product emits smoke and abnormal smell, or makes
an abnormal sound, immediately turn “OFF” the power.
Continuing to use the product may cause electric shock or
can create hazardous situations.

• Do not (dis)connect the connector while power to the
product is “ON”. It takes some time for the voltage to drop
to a sufficiently low level after the power has been turned
“OFF”. Confirm that the voltage has dropped to a safe level
before (dis)connecting the connector.

• Do not pull out or insert the power cable from/to an outlet
with wet hands. It may cause electric shock.

• If the power cable is damaged, or if the connector is loose,
do not use the product, otherwise, this can lead to
hazardous situations or may cause electric shock.

• The LCD Backlight Inverter unit uses a high voltage for the
lamps. Keep the cautions concerning electric shock and do
not touch the device circuitry handling the inverter unit. And
because the capacitors of the device circuitry may remain
charged at the moment of Power “OFF”, standing for 1
minute is required in order to discharge the device circuitry.

2.2.2 Caution

• Do not place this product in a location that is subject to
heavy vibration, or an unstable surface such as an inclined
surface. The product may fall off or fall over, causing
injuries.

• Before disconnecting cable from the product, be sure to
turn off the power. Be sure to hold the connector when
disconnecting cables. Pulling a cable with excessive force
may cause the core of the cable to be exposed or break the
cable, and this can lead to fire or electric shock.

• This product contains glass. If shock, vibration, heat or
distortion is applied to the product, the glass may be
broken.

• If glass surface of the display breaks or is scratched, do not
touched the broken pieces or the scratched with bare
hands. You may be injured.

• LCD Module requires to be handled with special care. LCD
Module is not to be touched with metal or hard materials.
Must not be stressed by heat or mechanical impact.

• There are some particular components on the rear panel of
this product. Skin contact with these components may
cause an electric shock. So, handle with care.

• While moving the product, be sure to turn off the power,
disconnect all cables and watch your step. Dropping the
product may cause injuries from electric shock. So, while
moving the product handle with care.

• When cleaning the panel is necessary, wipe it with a soft
and moistened cloth a neural detergent. Caution on
connector area. Do not use chemicals such as thinner or
benzene.

• LCD Module emits heat from the Lamp, Backlight lamp,
and component parts. Therefore, the environmental
temperature must not exceed 50 deg. C. LCD Module
Backlight Inverter system is driven by high voltage, so it
must avoid conductive materials.

• If repairing components with a lead line, high voltage or
high temperature components must be put out from a lead
line and fix.

• Do not place an object on the surface of the display. The
glass may break or be scratched.

• This product may be damaged if it is subject to excessive
stresses (such as excessive voltage, current, or
temperature). The absolute maximum ratings specify the
limits of these stresses.

• Do not cover or wrap with any covering materials while
power is applied to the product.

• This product is made from various materials such as glass,
metal, and plastic. When discarding it, be sure to contact a
purchase place.

• If a discrepancy occurs due to any arbitrary modification or
disassembly, supplier is not responsible for function,
quality or other items.

• Within the warranty period, general faults may be charged
for depending on responsibility for the faults. You handle
with care

2.3 Servicing Precautions

A colour TFT LCD Module can easily be damaged by both
electrical and mechanical stresses. Users therefore, are
requested to follow the “Servicing precautions of colour TFT
LCD Module” on the following.

2.3.1 System Assembler

• Follow the power sequence: An abnormal power
sequence may cause critical malfunction or electrical
damage.

• Prevent physical stress.

• Prevent overheat:
– High temperatures on the surface of the screen may

cause poor quality. Please use the LCD Module on the
specified temperatures.

– Low temperatures (under 10 deg. C) makes the LCD

Module respond slowly, make the Backlight worse
operated, and will shorten very much the lifetime
accordingly.

• Keep LCD Module dust-free: The LCD Module is
sensitive against dust; it can cause visual or functional
problems.

Directions for Use

EN 5LCD LPL 2k8 3.

• Do not touch TCP area: Do not touch TCP area at any
case. It can cause Driver IC cracks, film cracks, etc. The
TCP is the weakest point of the LCD Module.

• Do not pull Backlight wire: Please do not pull the
Backlight wire, as it can cause the wire to become
disconnected or damaged.

• Check the connections of the Inverter & Backlight
connectors: Incomplete connection can cause burnt in
Backlight connectors or damage the inverter.

• Handle with care:
– Please do not drop, bend, or hit the LCD Module.
– Physical stress can cause defects as broken panels.

• Keep mounting screw length and motor driver’s
torque: Strong motor driver’s torque can make a
mechanical defect on LCD Module. Please keep within the
specifications.

• Do not operate for a long time under the same pattern:
Operating the LCD Module for a long time with the same
video pattern can cause image persistence and can
eventually damage it.

• Defective panels must also be handled with care:
– To prevent making other defects, please handle the

defective LCD Module as a good one.

– Defective LCD Modules must be repaired.

• Do not stack LCD Modules: The LCD Module consists of
fragile components such as TCPs or Glasses. Stacking the
LCD Modules can cause undesired defects.

• Do not provide strong pressure at connecting: Strong
pressure can transfer the force to the TCP, which is the
weakest part of the LCD Module. It eventually can make
the TCP crack or lead to other unexpected defects.

• Let the Backlight Wire at the backside of the LCD
Module: If let the Backlight wire in front of the LCD Module,
the Backlight connector can hurt the surface of the
polariser.

• Never (dis)connect at power “ON”: The LCD Module
consists of CMOS components, which are known as weak
components against EOS. It can damage the product.

• Electrostatic discharge can make damage:
– Semi-assembled product should be handled with wrist

strap.
– Earth human body when handle the LCD Module.
– Please do not touch the interface connector pin.

2.3.2 System Assembler/End User

• Keep clean the surface:
– Please wear rubber gloves when you touch the surface

of the LCD Module screen.

– Please use soft and anti-static material with n-Hexane

as cleaner.

• Be careful not to make polariser scratch:
– Surface of polariser is soft, so it’s easily scratched.
– Please do not touch, press or rub on polariser surface

with materials over HB hardness.

• Be careful with swift temperature and humidity
changes: Swift temperature and or humidity change can
make dew condensation or ice, which can cause non­conformance such as malfunctioning.

• Keep out of water:
– Water on in the LCD Module can cause electrical short

or corrosion.

– Please wipe out or dry water carefully.

• Keep the LCD Module free from corrosive gasses:
Corrosive gas can chemically damage the polariser and
the circuitry parts and eventually will cause defects.

• Keep the suitable temperature and humidity:

High

temperatures and high humidity will shorten the lifetime

3. Directions for Use

Not applicable.

Mechanical Instructions

EN 6 LCD LPL 2k84.

4. Mechanical Instructions

Index of this chapter:

4.1 General

4.2 Model LC320WXD

4.3 Model LC320WXN

4.4 Model LC370WUF

4.5 Model LC370WXE

4.6 Model LC420WUE

4.7 Model LC420WUF

4.8 Model LC420WXE

4.9 Model LC470WUE

4.10 Model LC470WUF

4.1 General

4.1.1 Warnings

• Figures can deviate due to the different module executions.

• During repair, place the set face down on a soft surface
(e.g. on foam bars as mentioned in next paragraph), in
order to prevent damaging the display.
Note: With some chassis, it is possible to measure and
replace the boards while the TV is still on its stand.

• All ICs and many other semiconductors are susceptible to
electrostatic discharges (ESD w). Careless handling
during repair can reduce life drastically. Make sure that,
during repair, you are connected with the same potential as
the mass of the set by a wristband with resistance. Keep
components and tools also at this same potential.

Figure 4-1 ESD wristband

• Be careful during measurements in the high voltage
section. Never pull plugs out under operation conditions,
just to prevent danger caused by electrical sparks.

• Never replace modules or other components while the unit
is switched “on”.

• Connectors “to” and “from” the Inverter Boards must be
thoroughly connected to avoid any electrical sparks during
operation.

4.1.2 Inverter repair policy

Note: When an LCD display has a “master” and “slave” inverter

configuration, and one of these boards is defective, it is advised
to replace both the inverter boards (due to matching reasons).

4.1.3 Foam Bars

Figure 4-2 Foam bars

The foam bars (order code 3122 785 90580 for two pieces) can
be used for all types and sizes of flat displays. See figure
“Foam bars” for details. Displays with a size of 42” and larger,
require four foam bars [1]. Ensure that the foam bars are
always supporting the cabinet and never only the display.
Caution: Failure to follow these guidelines can seriously
damage the display!
By laying the TV face down on the (ESD protective) foam bars,
a stable situation is created to perform measurements and
alignments. By placing a mirror under the display, you can
monitor the screen.

4.1.4 Torque Values

Table 4-1 Recommended Torque Values

H_16920_001.eps

060407

Screw Type (cross head) Recommended Torque Value

M2 2.0 kg*F ± 0.1 kg*F

M2.5 3.0 kg*F ± 0.5 kg*F

M2.6 3.0 kg*F ± 0.5 kg*F

M3 6.0 kg*F ± 0.5 kg*F

E_06532_018.eps

171106

1

Required for sets

42"

1