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LH19/22S83D SERVICE MANUAL

INDEX:

PART 1Brief Introduction Of The LH19/22S83D
Schematic Diagram Block
Printed Circuit

PART 2: Exploded view

PART 3 Introduction
IC

PART 4: Detailed Circuit

PART 5: Components List

PART6: Debug Instruction
5 4 3 2 1
Part1:



D D


IR Board Key Board R L
INVERTER D
PANEL
BOARD
Loud Speaker

ebug Connector
CON6
TXD RXD GND 5V

CON4
CON22
5V IR GND V- RED GREEN GND V+ P+ P- MENU NC SOURCE POWER
LVDS Connector Key&IR Board Connector CON19

Loud Speaker Connector



C JP5 C




CON2
3.3V




EN
IR GND
JP2
NC GND SDA SCL
5V




GND
SW GND AGC GND SCL SDA GND IF GND




JP1
XP203




DVB-T Board




12V
CON37
CON39
9E19 TV Main Board
Schematic Diagram




Y GND C GND CVBS GND AL GND AR
CON15
B Y GND PB GND PR GND R L GND ON/OFF JP1 B




12V 12V EN BR GND GND
CON11




CON3
Inverter Connector
DVD Signal Connector
CON31




12V
GND
DVD Power Con nector




DVD Board DVD Keyboard



A Connecting Board A




5 4 3 2 1
Printed Circuit


TV Main Board (Top View)




Bottom view
TV Main Board
DVB Board (top view)




DVB Board(bottom view)
DVD Board (top view)




DVD Board(bottom view)
Part2: Exploded view
Part3:
IC Introduction

OCP2030 SWITCHING BUCK REGULATOR


General Description
The OCP2030 is a buck topology of switching regulator for wide operating voltage applications field. The OCP2030
includes a high current P-MOSFET, high precision reference (0.5V) for comparing output voltage with feedback
amplifier, an internal dead-time controller and oscillator for controlling the maximum duty cycle and PWM frequency,
and has power-on programmable soft start time and short circuit PMOS turn-off and auto re-start protection functions.

Features
Precision feedback reference voltage: 0.5V (2%)
Wide supply voltage operating range: 3.6 to 20V
Low current consumption: 3mA
Internal fixed oscillator frequency: Typ. 360KHz
Programmable Soft-Start function (SS)
Short Circuit Shutdown and Auto Re-start function(ARSCP)
Built-in P-MOSFET for 3A loading capability
Package: SOP8

Pin Configuration

Top View
Name No. Status Description
VCC 1 P IC Power Supply (PMOS Source)
1 8 Connecting with a Soft-start &
SS/SCP 2 I
ARSCP timing capacitor
2 7
IN- 3 I Error Amplifier Inverting Input
OCP2030 Error Amplifier Compensation
3 6 FB 4 O
Output
4 5 5
GND P IC Ground
6
7
LX O PMOS High Current Output
8
Block Diagram
1


Reference
Regulator Oscillator

Thermal
1.25V Shuntdown



3 36K Output drive
control circuits
500
0.5V

0.8V


4

Soft start&Auto Re-start
S.C.P Circuits



5 6 2 7 8
AP1084

5A Low Dropout Positive Adjustable or Fixed-Mode Regulator

Features General Description