Changhong Z15LCD1 Schematic

Website:http://biz.LGservice.com

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

LCD TV SERVICE
MANUAL

FACTORY MODEL: 15LV1R.AUSBZA

MODEL: Z15LCD1

CAUTION

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

- 1 -

CONTENTS

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

PRODUCT SAFETY .......................................................................................................................3

SPECIFICATION ...............................................................................................................................6

ADJUSTMENT INSTRUCTION .....................................................................................................9

TROUBLE SHOOTING ..................................................................................................................11

BLOCK DIAGRAM.........................................................................................................................15

WIRING DIAGRAM .........................................................................................................................17

EXPLODED VIEW ...............……………………………................................................................. 18

REPLACEMENT PARTS LIST .............................................……………………………................ 20

SVC. SHEET .................................................................................................................................

- 2 -

SAFETY PRECAUTIONS

- 3 -

SERVICING PRECAUTIONS

.

- 4 -

- 5 -

SPECIFICATION

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

1. Application range

1.1 This spec sheet is applied all of the 15" LCD TV

1.2 Not included spec and each product spec in this spec sheet apply correspondingly to the following each country
standard and requirement of Buyer

2. Specification

Each part is tested as below without special appointment.

2.1 Temperature: 20±5°C

2.2 Relative Humidity: 65±20%

2.3 Power Voltage: input voltage (110V±10%, 50/60±3 Hz)

* Standard Voltage of each product is marked by models

2.4 Specification and performance of each parts are followed each drawing and specification by part number in
accordance with BOM.

2.5 The receiver must be operated for about 30 minutes prior to the adjustment.

3.General Specification (TV)

No Item Specification

1. Input Signal RF (NTSC-M), Video, S-Video, Component Video, Graphic (VGA)

2. Component Support 480i, 576i, 480P, 576P, 720P, 1080i

3. Input Voltage 110V±10%, 50/60±3 Hz

4. Market USA

5. Screen Size 15 inch Wide

6. Vertical refresh rate 56 Hz to 75 Hz

7. Horizontal frequency 31.5 kHz

8. Resolutions

9. Operating Environment

10. Storage Environment

1024x768

Temp: 0 ~ 40 deg, Humidity: 10% ~ 80 %

Temp: -10 ~ 50 deg, Humidity: 5% ~ 85 %

- 6 -

4. External Input Format

4-1. RGB Input

Vertic al Horizontal Sync Polarity Presence Screen Mode

Dots × Lines

720 ×400 70.1 31.5 NEG POS YES YES YES

640 ×480

800 ×600

1024 x 768

4-2. AV/S-Video/Component Video Inputs

Frequency

(Hz)

59.9 31.5 NEG NEG YES YES YES

72.0 37.9 NEG NEG YES YES YES

75.0 37.5 NEG NEG YES YES YES

60.3 37.9 POS POS YES YES YES

72.2 48.1 POS POS YES YES YES

75.0 46.9 POS POS YES YES YES

60.0 48.3 NEG NEG YES YES YES

70.0 56.5 NEG NEG YES YES YES

75.0 NEG NEG YES YES YES

Frequency

(KHz)

Horizontal Vert ical Horizontal Ver tical

Full

(15:9)

AV (Composite Video)

S-Video

Component Video

Video system NTSC

Amplitude 1.0Vpp (including sync)

Impedance 75 ohm terminated

Video system NTSC

Y signal amplitude 1.0Vpp (including sync)

C signal amplitude 0.286Vpp

Impedance 75 ohm terminated

HDTV 480i, 576i, 480P, 576P, 720P, 1080i

Y signal amplitude 1.0Vpp (including sync)

Pr,(R-Y) / Pb ,(B-Y) signal amplitude 0.7Vpp

Impedance 75 ohm terminated

- 7 -

4-3. TV RF Inputs

TUNER SIGNAL

Receiving System NSTC-M

Channel Coverage NSTC-M

Tuner ChangHong AF5-U2F11RW

AIR CATV

VHF Low band 55.25~127.25 55.25~127.25

VHF High band 133.25~361.25 133.25~361.25

UHF band 367.25~801.25 367.25~801.25

Picture carrier Sound carrier

IF Frequency 45.75 MHz 41.25MHz

Impedance 75 ohm terminated

LEVEL 70dBuV

- 8 -

1. EDID content (RGB)

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

0 00 FF FF FF FF FF FF 00 1E 6D D1 15 0B 95 0D 00

16 13 10 01 03 68 1E 17 B6 2A E4 DE 9E 54 4A 97 23

32 1C 4C 54 BD CE 00 61 40 61 4A 61 4F 45 40 45 4F

48 31 40 31 4F 01 01 64 19 00 40 41 00 26 30 18 88

64 36 00 30 E4 10 00 00 18 00 00 00 FF 00 31 32 33

80 34 35 36 37 38 39 30 31 32 33 00 00 00 FD 00 3A

96 4B 1F 3C 08 00 0A 20 20 20 20 20 20 00 00 00 FC

112 00 5A 31 35 4C 43 44 31 0A 20 20 20 20 20 00 1C

ADJUSTMENT INSTRUCTION

- 9 -

2. SVC REMOCON

Key Function

POWER

Press to turn on/off the TV. The TV is never completely powered
off unless it is physically unplugged.

DISPLAY

MUTE

CH

VOL

0~9/100

PRE-CH

PC

V-CHIP

TV/VIDEO

SLEEP

MTS/SAP

Up/Down/
Left/Right

MENU

CAPTION

Display current status

Temporarily interrupt the sound or restore

Press ▲ or▼ to brows through the TV channels which are not
erased. To view a blocked channel, use the digit buttons to access
the channel and enter your access code.

Press + or – to adjust the volume.

To select a TV channel directly

To return the last channel you were watching.

To change PC mode (only for Z15LCD1)

Press this button to setup parental control.

Select your input source: press repeatedly to select TV, AV1, AV2,
S-Video or Component Video mode, according to where you
connected your external source.

With this key you can set a time period after which the TV should
switch itself to standby. Press the key repeatedly to select the
number of minutes. The counter runs from 0,30,60,90,120
minutes. The timer begins to count down from the number of
minutes selected after the display has disappeared.

Press this key to activate Multi-channel Television Sound, Stereo
or Mono sound.

Up/Down to select the function in the Menu.
Left/Right to enter the function or adjust the value

Press repeatedly to display OSD menu or exit the menu or
sub-menu.

Press this button to bring up closed caption setup menu.

- 10 -

1. No Power (

TROUBLE SHOOTING

No LED indicator)

No Power

Check T901

Check ZD903, ZD901, ZD902 IC902

Check power

cord and

OK

Check F901, BD901

OK

Check IC901

OK

OK

Check D910, D911

OK

Replace F902 or F903 Check the load

OK

NG

NG

Check the load

NG

NG

NG

NG

NG

Plug in power cord and interface

Replace ZD903, ZD90, ZD902 IC902

Replace F901 or BD901

Replace IC901 or Q901

Replace T901

Replace D910, D911

- 11 -

2. No Display (LED indicator green)

No display

Check the source

OK

Check LVDS cable

NG

NG

OK

Check 5V, 12V power

OK

Check main board power supply

OK

NG

Check U406

OK

Check I2C communication

OK

NG

Check panel

3. Can’t start (LED indicator yellow)

Can’t start

Check key board

NG

OK

Check 5V_SB

OK

NG

Check I2C communication

OK

Check oscillistor

Reset source

Replace LVDS cable

NG

Return to “1”

Replace U406

NG

Repair I2C communication relative circuit

Replace panel

Repair the key board

Check every chip power supply

NG

NG

Replace I2C communication component

Replace oscillistor

- 12 -

4. Abnormal Display

Abnormal display

Check the source

NG

Reset source

AV, S-video signal
component signal

OK

Repair each relative circuit

OK

Check signal filter circuit

Check input signal

OK

Check LVDS cable

OK

Check panel

NG

NG

NG

Replace the filter or inductance

OK

RF signal

Replace LVDS cable

Replace panel

Check TV system setup

OK

Check TU100

OK

Replace TU100

- 13 -

5. No Sound

Check signal filter circuit

Check Amplifier U601 TDA7266D

No sound

Check the source

OK

Check Earphone jack

OK

OK

Check speaker

Reset source

NG

Replace the filter or inductance

NG

Replace the Earphone jack

SIF signal Check TV system setup

OK

Check TU100

AV, component, S-video signal

NG

Replace U601

NG

Replace speaker

NG

NG

Replace TU100

Check relative circuit

- 14 -

1. Main Board

)

/

A

A

A

A

BLOCK DIAGRAM

PHILIPS LOC1 TV Block Diagram

PC D-sub

HD input

PC H/V Input

VIDEO 1

S-VIDEO

ANT INT

PC Audio

V Audio

HD Audio

IR

Key PAD

IF Tuner
Philips
1336MK

Flash

PI5V

330W

Power Internal

AC 100～220 Input

Inverter For TV

Inverter

Y/PR/PB

Video H/V Output

Switch

4052

SawFilter /VF45A3M

SawFilter /AF45A3M

Audio IF

Philips

RGB

PI5V

330W

DC 12V

DC 5V

SST39V F020B

LOC1

TDA15501E

TTL output

TTL TO LVDS

THC63LVDM84R

LVD S o u tput

PANEL

U or CPT

SD

SDA

/SCL

SCL

EEPROMM24C32

32K

4052

SDA/SCL

VSCL/VSDA

udio Output

TDA7266D
Audio AMP

Speaker (2Wx 2

Headphone

DDC SCL/SDA

DDC

EEPROM

Switch

- 15 -

2. Power Board

- 16 -