China LT104CC LCD Schematic

LT104CC

CONTENTS

1. Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3. Description of controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3-1 Location of Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3-2 Remote Control Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4-1 Micro-Controller (IC001) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4-2 Flash Memory (IC003) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4-3 CMOS SRAM (IC004) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4-4 Multi-Sound Processor (IC601) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4-5 Power Amplifier (IC604) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4-6 LCD Flat Panel TV/PC Monitor Controller (IC901) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4-7 Flatlink TM Transmitter (IC903) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4-8

140 MSPS Analog Interface for Flat Panel Displays (IC904)

. . . . . . . . . . . . . . . . . . . . . . 13

4-9 1A Low Dropout Linear Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4-10 Step-Down Voltage Regulator (IC802) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5. Trouble shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5-1 No Power in Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5-2 No Power in Power Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

5-3 No Raster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5-4 No Picture (Power is normal ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

5-5 No Picture (TV, A/V mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5-6 No Picture (VGA Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5-7 No Sound (Power is Normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

5-8 No Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7. PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

8. Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9. Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10. Circuit Diagram

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 same components as
Recommended in this manual to prevent Shock, or Fire, or other Hazards.
Do not modify the original design without permission of menufacturer.

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
Groung (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 of the AC cord info the AC outlet and repeat AC voltage measurements for each
exposed 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 specified, there is possibility of shock hazard and the
set must be checked repaired before it is returned to the customer.

AC VOLTMETER

0.15uF
Place this probe

on each exposed
metal part

Good earth ground
such as a water
pipe, conduit etc

1500 ohm
10 watt

1. Safety precautions

2. Specifications

Color System
Receiving channel

POWER

SOUND

LCD

Power Input
Power Consumption
Sound output
Speaker Number
TFT LCD (10.4 Inch)
Display resolution (pixel)
Active area (mm)

NTSC-M
VHF CH : 2~13
UHF CH : 14~69
CABLE CH : 1~125
DC 18~32V, AC25~35V
Max : 33W

1.2W+1.2W AT the 10%
2 Pieces (8ohm, 8W)
B1048N02
800(H) X 600(V)

211.2(H) X 158.4(V)
On-screen display
Requires two 1.5V batteries type AAA size
100CH memory capacity.

Channel Indication
Remote Control Unit
Program CH Memory

WARNING :

TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS TELEVISION
TO RAIN OR MOISTURE

3. Description of controls

1.

Headphone Input Terminal

2. Menu Button

3. Moving Key (

Left)

4. Moving Key (

Right)

5. Moving Key (

Down)

6. Moving Key (

Up)

7. Enter/CC Button

8. Channel Down(-) Button

9. Channel Up(+) Button

10. Volume Down (-) Button

11. Volume Up (+) Button
12

. Power Button

1

3.

Stand By Indicator

1

4. TV Ant. Input and Power Input cable

1

5.

Comput Module connection cable

12 3 4 5 6 7 8 9 10 11 1213

14

15

3-1. LOCATION OF CONTROLS

3-2 REMOTE CONTROL USE

4. Technical information

ANALYSIS OF THE CIRCUIT

4-1 MICRO-Controller (IC001)

The micro-controller is composed of a 100 pin CPU (SDA5550M)

4-2 Flash Memory (IC003)

The AT49LV040 are 3-volt only, 4-megabit Flash memories organized as 524,288 words of 8-bits each.

- Single Voltage for Read and Write : 3.0V to 3.6V

- Fast Read Access Time - 70ns

- Internal Program Control and Timer

- 16K Bytes Boot Block with Lockout

- Fast Chip Erase Cycle Time - 10 seconds

- Byte - by - Byte Programming - 30us/Byte Typical

- Hardware Data Protection

- Data Polling for End of Program Detection

- Typical 10,000 Write Cycles

4-3 CMOS SRAM (IC004)

FEATURES

- Power supply range : 2.7V to 3.6V

- Access times : 55/70 ns (max.)

- Full static operation, no clock or refreshing required

- All inputs and outputs are directly TTL-compatible

- Common I/O using three-state output

- Output enable and two chip enable inputs for easy application

4-4 MULTI-Sound Processor (IC601)

MSP3420G, the single-chip multi-standard sound processor covers the sound processing of all analog
TV-standrds worldwide, as well as the nicam digital sound standards.

4-5 Power Amplifier (IC604)

The LA4282 is an IC which seals a high-output power amplifiea for TVs and monitors in a compact package.

- High - power 2 - channel AF power amplifier.

- Low distortion

- Minimum number of external parts required

- External muting available

- Low pop noise at the time of power supply ON/OFF

- On-chip protector against abnormality