Changhong LED32D2200, HLT57EJ 9206B Schematic

LED COLOUR TV

MAINTENANCE MANUAL

MODEL: HLT57EJ CHASSIS（9206B）

PCB VERSION：JUC7.820.00117550-1

Please read this manual carefully before maintenance

CATALOG

Chapter1 Safety and notes ......................................................................................................................................................... 3

1-1 Installation notes ......................................................................................................................................................... 3

1-2 Attention points of operation and using ...................................................................................................................... 3

1-3 Storage notes ............................................................................................................................................................... 3

1-4 Dismantling notes ........................................................................................................................................................ 3

1-5 High-voltage warning .................................................................................................................................................. 4

Chapter2 whole machine standard and terminal functions ........................................................................................................ 4

2-1 Basic standard ............................................................................................................................................................. 4

2-2 Introduction of terminals(practicality photos) ............................................................................................................. 5

Chapter3 Main chip functions and the introductions of power supply ...................................................................................... 5

3-1 Main IC and functions of HLT57EJ ............................................................................................................................ 5

3-2 Pin function description of HTL57EJ chip .................................................................................................................. 6

3-2-1 9206B recommended operating power conditons ......................................................................................... 6

3-2-2 Pin function of DMI21 -C8I2RH(JUB2.891.367-1) tuner ..................................................................... 7

3-2-3GD25Q64BSIG 64Mbit(8M x 8bit) brief introduction: ................................................................................ 7

4-1 9206B Power Block Diagram .................................................................................................................................. 7

4-2 Power supply system ................................................................................................................................................... 8

4-2-1 Pin voltage of the voltage adjustor on the mainboard ...................................................................................... 8

4-2-3 Interface definition ......................................................................................................................................... 10

4-3 The waveform of key points ...................................................................................................................................... 11

Chapter5 Software upgrade instructions .................................................................................................................................. 12

5-1 UART Upgrade ......................................................................................................................................................... 12

5.2 USB Upgrade .......................................................................................................................................................... 17

Chapter6: Classical accident maintenance procedures and examples ..................................................................................... 18

6-1 The thinking of don’t boot ......................................................................................................................................... 18

6-2 Common problems for your reference ...................................................................................................................... 19

Chapter7 High voltage and high current wearing parts list ..................................................................................................... 19

Chapter8 Factory mode parameter setting instructions and notes ........................................................................................... 20

8-1 Enter into the factory mode ....................................................................................................................................... 20

8-2 Setting method of factory menu ................................................................................................................................ 22

Chapter1 Safety and notes

1-1 Installation notes

(1) Please don't beat or rub, scratch the surface of the LED screen heavily, don’t touch it with your hand
casually.
(2) When the screen is dirty, please clean it with absorbent cotton or cotton cloth slightly.
(3) Please clean it timely when water or other viscosity pollution fall, which may make the LED face or
color change.
(4) Please don’t make the LED screen shaked by strong external force.

1-2 Attention points of operation and using

(1) Please unplug the power cable before moving the LED screen.
(2) Please don’t change the original setting of the mainboard’s, if not, the brightness and white balance etc.
may not meet the specification.
(3) The radiation of a long time using in the room temperature is larger than the low temperature.
(4) Please note that the long displaying image may remain at the top when shutdown the machine.
(5) Please avoid the impact from the mobile phone to protect your TV.

1-3 Storage notes

(1)When stored for a long time, please keep the temperature between 0℃to 40℃,don’t expose the TV to the
strong sunlight, the humidity should be less than 85％RH.

(2)Please don’t put your TV under high humidity and high temperature environment, for example, the

temperature: 60℃, and the humidity: 85%RH.
(3)Please don’t put your TV under low temperature environment, for example, the temperature lower than

-25℃.

1-4 Dismantling notes

(1)As LED screen is easy to be damaged, while dismantle, please attention to protect.
(2)Please attention the position of each screw when dismantle, in case to beat the wrong position when
install, if not, it may lead to crack or slide of the face frame.
(3) If you need to dismantle the power board or the mainboard, please attention the position and direction of

each line, especially the direction of the screen line, in case of causing accident when install. Before

Item

Standard

TV function
sound system

B/G、D/K、I、M

color system

PAL / SECAM / NTSC

Audio and video
signal input

AV

AV x 1

Audio L/R x 2

aberration signal

YPbPr x 1

support to1080P ，Audio L/R x 1,

HDMI

HDMI x3

support to1080P

USB

USB x1

support media player

PC input

plug and use

input frequency

H: 31.5K -50KHz
V: 60Hz

recommend

1280x768(60HZ)

Phone x 1

PC audio input

SCART

SCART x 1

CVBS、RGB、AUDIO

Video output

Output CVBS signal

Output TV ,Audio L/R x 1

Audio output

Audio output L / R

8W inner speakers for each channel
Support Dolby Pro Logic

SPDIF

Optical Fiber

Support Audio output

Power

power supply

AC100V~240V, 50/60Hz

requirement for environment
power achievement

<150W

operation temperature
storage temperature
operation humidity

+ 0° ~ + 40° ，

- 20 ° ~ + 60°
10% ~ 85%

appearance size

W x H x D

net weight

no accessory

Kg

dismantle, we can take some photos of the line route for the comparison of installing.
(4)After check and maintenance, please assure that there is no foreign body in the machine when install.

1-5 High-voltage warning

The high-voltage of the LED screen is generated by the power supply board, without attention to exposure to
the high voltage, one may meet a serious electricity shock.

Chapter2 whole machine standard and terminal functions

2-1 Basic standard

2-2 Introduction of terminals(practicality photos)

No.

Item no.

Model

Main function

1

A001

DMI21-C8I2RH(JUB2.891.367-1)

Tuner output IF signal
Support PAL\NTSC\SECAM\DVB-T\DVB-C

2

AS001

EDS-11670FNPRB

Tuner output IF signal
Support DVB-S/DVB-S2

3

U201

9206B

Video decoder, image processor, A/D and D/A conversion

4

U700

R-RT9108NBGCP

15W Stereo (BTL) Analog Input Audio Amplifier with
Power Limiter and DC Detect

SPDIF

HDMI1 input

PC input

YpbPr1 input

PC audio input

AV1 input

HDMI2 input

Keypad IR input

Audio output

Lvds output

Power input

HDMI3 input

USB1 input

Main Chip

Headphone

SCART/AVO

CI1

ATTENTION:

1.HDMI and YPbPr support to 1080P；

2.The recommendation resolving ratio of PC is 1280X768；

Chapter3 Main chip functions and the introductions of power supply

3-1 Main IC and functions of HLT57EJ

5

U207

GD25Q64BSIG

64 Mbit(8M x8bit), low voltage, Serial Flash memory

6

U802

MP1471

12V to 1.0V DC-DC/For COER

7

U801

TPS54428E

12V_standby to 5VS VDC-DC

8

U803

AMS1117-ADJ

5V to 1.5V LDO/For DDR3 & Main Chip

9

U805

AMS1117-3.3V

5V to 3.3V LDO/NORMAL

10

U804

AMS1117-3.3V

5V to 3.3V LDO/Standby

12

U806

AMS1117-ADJ

5V to 3.3V LDO/TUNER

U207:Flash Memory

U803: LDO-1.5V

A001:

DMI21-C8I2RH(JUB2.891.36

U700:
RT9108NBGCPRT9108N

U201: 9206B

U805: LDO-3.3V

U806: LDO-3.3V

U804: LDO-3.3V

U802:DC-DC

U801:DC-DC

.

3-2 Pin function description of HTL57EJ chip

3-2-1 9206B recommended operating power conditons

(The Main Chip cancel 1.8V Supply Voltages because of DDR3 supplied by 1.5V )

PIN

SYMBOL

Description

1

Ant power

Not connect

2

VCC

+3.3V POWER

3

SCL

I2C Serial Clock

4

SDA

I2C Serial DATA

5

GND

Ground

6

CLK_OUT

Not connect

7

DIF_N

High level IF output2

8

DIF_P

High level IF output1

9

IF-AGC

IF AGC Control Voltage

3-2-2 Pin function of DMI21-C8I2RH(JUB2.891.367-1) tuner

3-2-3 GD25Q64BSIG 64Mbit(8M x 8bit) brief introduction:

4-1 9206B Power Block Diagram

item No.

U802

U805

U806

U804

U803

output voltage

1.0V

1.5V

3.3V

3.3V

3.3

4-2 Power supply system

4-2-1 Pin voltage of the voltage adjustor on the mainboard

3.3V

1.5V

1.0V

3.3V

3.3

4-2-3 Interface definition

GND
KEY0
KEY1
LEDG
LEDR
IR-IN
GND
5VS

L+
L­R­R+

LED+
NC
LED_

LVDS

Power input

4-3 The waveform of key points
5-1 UART Upgrade