LG RU-52SZ30 Service Manual

LCD PROJECTION TV

SERVICE MANUAL

CAUTION

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

CHASSIS : NB-03JA

MODEL : RU-52SZ30 RU-60SZ30

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

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

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

SERVICING PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

ELECTROSTATICALLY SENSITIVE (ES) DEVICES . . . . . . . . . . . . . . . . . . . . . . . . 4

DESCRIPTION OF CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

ADJUSTMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

REPLACING THE LAMP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

EXPLODED VIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24, 26

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25,27

REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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

- 2 -

- 3 -

SAFETY PRECAUTIONS

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

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 TV receiver 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.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc.,
to be sure the set is safe to operate without damage of
electrical shock.

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

0.15uF

SERVICING PRECAUTIONS

- 4 -

CAUTION: Before servicing instruments covered by this service manual and
its supplements, read and follow the SAFETY PRECAUTIONS section of this
manual. Note: If unforeseen circumstances create conflict between the follow­ing servicing precautions and any of the safety precautions, always follow the
safety precautions. Remember: Safety First.

General Servicing Precautions

1. a. Always unplug the instrument AC power cord from the AC power source
before: (1) removing or reinstalling any component, circuit board, module,
or any other instrument assembly. (2) disconnecting or reconnecting any
instrument electrical plug or other electrical connections. (3) connecting a
test substitute in parallel with an electrolytic capacitor in the instrument.
Caution: A wrong part substitution or incorrect polar-ity installation of
electrolytic capacitors may result in an explosion hazard.

b. Do not defeat any plug/socket B+ voltage interlocks with which instru-

ments covered by this service manual might be equipped.

c. Do not apply AC power to this instrument and/or any of its electrical

assemblies unless all solid-state device heat sinks are correctly installed.

d. Always connect a test instrument’s ground lead to the instrument chassis

ground before connecting the test instrument positive lead.
Always remove the test instrument ground lead last.

Note: Refer to the Safety Precautions section of this manual.

2. The service precautions are indicated or printed on the cabinet, chassis, or

components. When servicing, follow the printed or indicated service precau­tions and service materials.

3. The components used in the unit have a specified flame resistance and
dielectric strength. When replacing any components, use components
which have the same ratings. Components identified by shading, by

*

, or
by in the circuit diagram are important for safety or for the characteristics
of the unit. Always replace with the exact replacement components.

4. An insulation tube or tape is sometimes used and some components are
raised above the printed wiring board for safety. The internal wiring is some­times clamped to prevent contact with heating components. Install them as
they were.

5. After servicing, always check that the removed screws, components, and
wiring have been installed correctly and that the portion around the service
part have not been damaged. Further, check the insulation between the
blades of the attachment plug and accessible conductive parts.

INSULATION CHECKING PROCEDURE

Disconnect the attachment plug from the AC outlet and turn the power on.
Connect the insulation resistance meter (500 V) to the blades of the attach­ment plug. The insulation resistance between each blade of the attachment
plug and accessible conductive parts (Note 1) should be more than 1 Mohm.

Note: Accessible conductive parts include metal panels, input terminals, ear­phone jacks, etc.

ELECTROSTATICALLY SENSITIVE (ES) DEVICES

Some semiconductor (solid-state) devices can be damaged eas­ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam­age caused by static electricity.

1. Immediately before handling any semiconductor component
or semiconductor-equipped assembly, drain off any electrosta­tic charge on the body by touching a known earth ground.
Alternatively, obtain and wear a commercially available dis­charging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit
under test.

2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or expo­sure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.

4. Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate
electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install
t.(Most replacement ES devices are packaged with leads elec­trically shorted together by conductive foam, aluminum foil, or
comparable conductive material.)

7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective materi­al to the chassis or circuit assembly into which the device will
be installed.
Caution: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replace
ment ES devices. (Otherwise, seemingly harmless motion,
such as the brushing together of your clothing or the lifting of
your foot from a carpeted floor, can generate static electricity
sufficient to damage an ES device.)

- 5 -

DESCRIPTION OF CONTROLS

Function Status Indicators

Lamp indicator, operation indicator, and temperature indicator located below the front panel
controls, reveal the operating status of the LCD projection TV.

Operation Indicator

Lamp Indicator

Temperature Indicator

Operation Indicator

Lamp Indicator

Temperature Indicator

Off Power cord is not connected.
Red Power Cord is connected, TV is in standby mode.
Green On
Orange (flashing) Preparing operation in standby mode.
Orange Projection lamp is reaching the end of its life and needs to

be replaced with a new lamp.

Red (flashing) There is a problem with the lamp or around it. Contact an

authorized service center.
Green (flashing) The lamp cover is not closed.
Orange The projection TV is overheating.
Red The projection TV shut down due to overheating.
Red (flashing) The projection TV shut down, check the cooling fan.

- 6 -

On-Screen Displays

10

AM 03:00

TV 13

MONO

TV 6

This page describes your on-screen display and information banner options.

Main Channel Display

Displays current channel number.

Channel Label

If a channel label has been
set, then it will appear here.

PIP Display

This display
appears when

ABC

PIP is active.

Mute

Appears
when sound
is muted.

Volume

Volume level is displayed while
adjusting the sound.

Time

Appears when
pressing the
enter button on
remote control.

- 7 -

Front Panel Controls

power menu enter vol ch



power menu enter vol ch



1
2
3

4

5
6

7
8

Power On / Off
Menu
Enter (Same as ENTER button on

your remote control)
VOLUME UP / DOWN
CHANNEL UP / DOWN
Operation indicator.
Lamp indicator.

Temperature indicator.

RU-52SZ30

1

3

4

5

6

2

8

7

See menu pages for instructions on using the
on-screen menus.

The POWER, CHANNEL and VOLUME buttons
work just as they do on your remote control.

Don’t turn TV on after placing TV from low tempera­ture to normal temperature. It may cause humidity of
inside TV. Try it again after about 3 hours.

RU-60SZ30

- 8 -

Remote Control Functions in TV Mode

1 2 3
4 5 6
7 8 9

0

tv

mode

light

power

tv/video

dvi

rgb

vcr

cable

dvd

sat

mute

swappipch- pipch+

pip

ratio

recordstop

pause

rew

play

ff

menu exit

cc freeze

pip input

vol

ch

surf

sap

video

comp2comp1

front

skip

enter flashbk

Allows you to navigate the on-screen

menus and to adjust the system set-

tings and preferences, by moving to

an option with

Selects the remote operating
mode: TV, VCR, Cable, DVD

and Satellite. Select other oper-

ating modes, for the remote to

control external devices.

TV/VIDEO

MODE

Selects: Analog, Video1,

Component1-2, RGB, and DVI

Video2, Front video,

input sources.

FRONT

Selects the front video signal if
a device, such as a camcorder

or game player, is connected

to the front video input jack.

MUTE

Switches the sound on or off

SAP

Selects: Mono, Stereo, and

SAP.

PIP

Toggles between PIP, POP
(Picture-out-of-Picture) and

Twin picture mode.

PIPCH-

Changes to next

lower PIP channel

THUMBSTICK

D

F G

and selecting the

E

highlighted option with .

INDICATOR LIGHTS

Show active remote mode
every time any button is
pressed.

LIGHT

Illuminates the remote con­trol keys.

DVI

Selects: DVI-DTV and DVI­PC input sources.

SURF

Scrolls the Surf channel list.

VIDEO

Adjusts the factory preset pic­ture according to the room.

SWAP

Swap the signal from your
PIP, POP, twin picture
mode to the main screen.

PIPCH+

Changes to next higher PIP
channel.

FREEZE

Captures and freezes the currently­viewed sub picture in PIP mode.

Brings up the main

menu to the screen.

MENU

EXIT

Clears all on-screen dis­plays and returns to TV
viewing from any menu.

- 9 -

Remote Control Functions in TV Mode

1 2 3
4 5 6
7 8 9

0

tv

mode

light

power

tv/video

dvi

rgb

vcr

cable

dvd

sat

mute

swappipch- pipch+

pip

ratio

recordstop

pause

rew

play

ff

menu exit

cc freeze

pip input

vol

ch

surf

sap

video

comp2comp1

front

skip

enter flashbk

POWER

Turns your TV or any other
programmed equipment on
or off, depending on mode.

Selects component signal sources,

such as DVD or HD receiver.

NUMBER KEYPAD

COMPONENT 1, 2

For direct channel selection and

programming functions.

When in the menu system and

other on-screen displays,

selects highlighted options.

VOLUME UP/DOWN

Increases/decreases the sound

Changes the screen format or

Lets you select a closed caption

mode for displaying captioning

information when provided.

RECORD, PAUSE, REW,

Control the functions on your VCR.

FFWD, PLAY, STOP

ENTER

level.

RATIO

aspect ratio.

CC

RGB

Selects: RGB-DTV and
RGB-PC input sources.

FLASHBK

Tunes to the last channel
viewed.

CHANNEL UP/DOWN

Scrolls through available chan­nels in EZ Scan memory.

PIP INPUT

Selects the input source for the
sub picture.

ENTER

When in the menu system
and other on-screen dis­plays, selects highlighted
options.

SKIP

Playing CDs: Selects
songs.
Playing DVDs: Selects
movie chapters.

- 10 -

Rear Connections Panel

C
A
L
I
B
R
A
T
I
O
N

PC/DTV
(XGA
/480p
/720p
/1080i)

AUDIO

CENTER

MODE IN

P

R

DVI INPUT

DTV/DVD INPUT

COMPONENT

INPUT2 INPUT1

PB

Y

PC/DTV
(XGA
/480p
/720p
/1080i)

RGB INPUT

RGB/DVI INPUT

(R)

(L)

AUDIO

(R)

(L)

AUDIO

(R)

(L)

AUDIO

V
A
R
I
A
B
L
E

A
U
D
I
O

O
U
T

MONITOR

OUT

VIDEO

INPUT 2

VIDEO

INPUT 1

S-VIDEO

(R)

(L)

AUDIO

VIDEO

MONO

+75 Ω

ANT IN

Connecting cables to your TV.

PC and HD-STB Input

Used to connect from a

PC source or HD-STB

Satellite system.

RF Connector: Antenna
Used to connect analog
cable or antenna signals
to the television, either
directly or through your
cable box.

S-VIDEO In
A connection available with
some high-end equipment
that provides even better
picture quality for Video 2.

Video 1 or 2
Connects the video sig­nals from various types
of equipment.

Left/Right Audio
Used for stereo sound
from various types of
equipment.

Monitor Out
Connects to a second TV
or Monitor.

DVD Component Video and HD Component

Y, Pb, Pr

Video

Some top-of-the-line DVD players use what

is called “component video,” for extremely

accurate picture reproduction. Refer to your

PC and HD-STB Audio

Input

Used for audio connec-

tions from a PC source or

HD-STB Satellite system.

Variable Audio Out
Used to connect either
an external amplifier, or
add a sub-woofer to your
surround sound system.

Audio Center Mode IN
Connect to external Dolby
Digital Center “preamp out­put.”

DVD manual for further information.

Mini glossary

JACK A connection on the back of a TV, VCR, or any other A/V device. This includes the RF jack and the Audio/Video jacks that are

color-coded.

SIGNAL Picture and sound traveling through cable, or over the air, to your television screen.

- 11 -

Front Connection Panel

Front A/V Panel

S-VIDEO

VIDEO

FRONT A/V

AUDIO

L/MONOR



There are four jacks on the left front
side behind the screen on your projec­tion TV that make connecting
Audio/Video devices like video games
and camcorders very simple.

The jacks are like those found on the
back jack connection panel. This means
that most equipment that connects to
those types of jacks on the rear jack­pack, may be connected to the front
connection panel.

To use the front jacks as the signal
source, select them using Main Source
menu as described on page 22. They
will be named “Front Video” in the Main
Source menu.

When you select Front Video or
Front S-Video, the Front audio
inputs are automatically select­ed as well.

If you’re connecting a video
game device, make sure to
change the
picture settings with the EZ
Video option in the Video menu.

Video
Connects the video
signals from any
piece of equipment.

Left/Right Audio
Used for stereo
sound from various
types of equipment.

S-Video
A connection avail­able on some very
high-end equipment
that provides better
picture quality than
video input.

Mini glossary

A/V CABLES Audio/Video cables. Three cable connector—Right audio (red), Left audio (white), and Video (yellow). A/V cables are used

A/V DEVICE Any device that produces video or sound (VCR, DVD, cable box, or television).

for stereo playback of videocassettes and for higher quality picture and sound from other A/V devices.

- 12 -

SPECIFICATION

Product Specifications

Models

RU-52SZ30 Horizontal Size (inches) 50.4

RU-60SZ30 Horizontal Size (inches) 56.7

Power requirement 120V, 60Hz
Television system American TV Standard, NTSC, ATSC with STB
Television Channel VHF: 2 - 13

Power consumption (W) 250W
Antenna 75 ohm external terminal for VHF/UHF
Audio Output (W) 10W x 2
Supplied accessories Remote control, batteries 2 size AA(Alkaline battery)
Screen Aspect Ratio 16 x 9
LCD Panel Size 0.87 inch (RU-52SZ30), 1.21 inch (RU-60SZ30)
External input ports Video input (3 set)

Height (inches) 38.8
Thickness (inches) 15.3
Weight (lbs) 119

Height (inches) 42.7
Thickness (inches) 19.4
Weight (lbs) 141

UHF: 14 - 69
CATV: 1 - 125

Video output (1 set)
S-Video input (2)
Component input (2 set)
RGB input (1)
DVI input (1)
RGB/DVI audio input (1 set)
Variable audio output (1 set)
Audio center mode input (1)
Calibration port (1)

Design and specifications are subject to change without prior notice.

1. Application Object

This instruction is for the application to the LCD projection TV.

2. Notes

(1) The power source insulation of this LCD Projection TV is

not charging type and you may not use the transformer for
insulation. But you better adjust the set after operating it
with insulation transformer between power supply cable and
input part of the set for protecting the adjusting equipment.

(2) The adjustment must be performed under the correct

sequence.

(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 120V, 60Hz in

adjusting.

(5) The set must be operated for 15 minuets preliminarily

before adjustment if there is no specific designation.
The preliminary operation must be performed after receiv­ing 100% white pattern, but reception of the moving pic­ture may also be possible in unavoidable case.

3. Compomation of Adjustment Mode

(1) All adjustment mode are entered by pressing the IN-

START key on the remote control, after adjustment press
the IN-START key to come out.

(2) Compomation of adjustment mode: The first screen com-

position of pressing IN-START key.

(fig. 1) The first screen of adjustment mode

(3) Select menu to adjust(turn to yellow) with using (CH+(D),

CH-(E)) key above screen and press the enter key to
adjust on the wanting menu.

(4) After being inputed for SUB menu, select the SUB menu

with using (CH+(D),CH-(E)) key and adjust the value of
adjustment with using the volume +(F),volume - (G) key.

(5) Press the IN-START key to come out after adjustment,

when (fig.1) is appeared, press again to come out the final
adjustment mode.

(6) SUB menu composition of each adjustment mode

1) Adjust Mode : Sub adjustment menu selected by IN­START key.
RGB alignment is selected in this case.

2) Step123 : Step selection when changing data.
ex) Step123:1 --> Change one by one when changing

data with Volume key
Step123:10 --> Change ten by ten when changing data
with Volume key
You can select 1 by press number key ‘1’, 10 by press
‘12’, 100 by press ‘123’. And you can change data by
1, 10, 100.

3) 10. H_position 315/315/315 : Actual adjusting menu.

4) Micom : V0.50 : Main Micom Version display of Digital
board.

5) SubMicom : V01.31 : Micom Version display of Tuner
board.

6) LCDMicom : V01.31 : Micom Version display of Drive
board.

7) Lamp : 16 : Lamp time display.

4. LCD Adjustment

4-1. NRS Adjustment

[ When the LCD pannel load data on regular pixel using high

speed charge/discharge with sample & holder, the drain
width of TFT gradually decreases and the non-resistance
increases, and comes out regular noise on screen(shows
vertical line by 12 pixel)

This NRS signal is enforced charge/discharge signal so
that the ON/OFF time of TFT mode quickly before starting
active video signal, H/L level adjustment is possible to
each R, G, B.

(1) Required Test Equipments

1) PC Pattern Generator : 16 Step Gray Pattern

2) Fixation Stand

3) Remote Control for Adjustment

4) Circuit thing Jig for Adjustment(Except Driver Board Assy)

(2) Equipment Composition : Follow Fig. 2
(3) Preparation for Adjustment

1) Connect PC Pattern Generator with adjustment Jig like
Fig. 2. (Except Drive part of a circuit block)

2) Select a PC Pattern Generator, 16 Gray.

(4) Adjustment Sequence

1) Turn on a adjustment Jig.

2) Select a RGB_PC by pressing Input Select button on
Remote Control.

3) Enter to adjustment mode by pressing IN-START button on
Remote Control.

EZ ADJUST V*.**

1. VPX3226 Main

2. VPX3226 Sub

3. RGB Alignment

4. 62352

5. Gamma Adjust

6. Uniformity Adj

7. AD9883 Adjust

8. MPX Level Adjust

9. SD-RAM CLK

10. Lamp Replace

Adjust Mode : RGB Alignment Step 123:1

Micom:V0.50 SubMicom:V01.31 LCDMicom:V01.31 Lamp:16

- 13 -

ADJUSTMENT INSTRUCTIONS

10. H_Position 315/315/315