Toshiba 20HL67, 20HLK67 Schematic

FILE NO. 050-200706GR

SERVICE MANUAL

LCD COLOR TELEVISION

20HL67

20HLK67

The above models are classified as green products (*1), as indicated by underlined serial numbers. This Service Manual describes replacement parts for green products. When repairing these green products, use the parts described in this manual and lead-free solder (*2). FOr (*1) and (*2), see

page 3.

DOCUMENT CREATED IN JAPAN, Nov., 2007

TABLE OF CONTENS

SERVICE INSTRUCTIONS............................................................................. 4

HANDLING THE LCD MODULE .................................................................. 5

APPEARANCE DESCRIPTION ..................................................................... 7

TROUBLE SHOOTING GUIDE ..................................................................... 9

PACKING EXPLODED VIEW ...................................................................... 12

CIRCUIT BLOCK DIAGRAM...................................................................... 17

PCB DRAWING............................................................................................... 41

SPARE PARTS LIST ....................................................................................... 44

2

3

SERVICE INSTRUCTIONS

4

HANDLING THE LCD MODULE

5

6

Appearance Description

z 20HLK67

7

z 20HL67

8

Trouble Shooting Guide

1. Introduction

This document is prepared to be a guide to repair trouble sets, some problems happen more frequently are taken

as example in it. Those are turn on fail, no signal, no sound, etc.

System Trouble Shooting Flow Chart

Power On OK?

Yes

Backlight OK?

(No full white)

Yes

No

Check adapter AC socket to LCD TV.

ok

Check cable connection

between power board and

ok

Check power board VCC

ok

Update F/W

Check cable connection

between main board and

ok

Check power Board

CN101,

Pin 1: Inverter Dim./Adj.

Error

Re-plug in the AC

adapter and make sure

Re-plug in the cable

and make sure it is

Power BD issue

Check main Board

trouble shooting

Re-plug in the cable

and make sure it is

Check main Board

trouble shooting

ok

IR, remote

No

controller,

keypad and LED

Yes

control: 0V brightness max.

1. Check remote

controller battery.

2. Check wire connection

between main board,

keypad and IR board..

ok

9

Error

Power Board/ panel

issue

Replace them or re

plugged in the wire

ok

Yes

OSD Image OK?

Yes

No signal?

No

Yes

Check remote controller.

(If there is TV bottom on

the RCU press it and try

ok

Update F/W

Check cable connection

between main board and

ok

Update F/W

Check input cable.

ok

Error

Replace the RCU and

try again

Check main Board

trouble shooting

Re-plug in the cable

and make sure it is

Check main Board

trouble shooting

Re-plug in the cable

and make sure it is

No

Check OSD source set up.

ok

Check signal timing (signal

that is input to the TV set)

ok

Update F/W

Error

Change the OSD input

source to where the

Re set the input signal

timing to meet the

Check main Board

trouble shooting

10

b

No

Audio OK?

Yes

Function OK?

No

Check audio input

Yes

Check wire between main

oard to speaker.

Yes

Update F/W

Error

Make sure the audio

input is in spec

Re-plug in the cable

and make sure it is

Check main Board

trouble shooting

Check main Board

trouble shooting

11

PACKING EXPLODED VIEW

ITEM Model P/N Description

1

2

3 20HLK67/20HL67 75007307 ASSY REAR CVR ATSC T20WD8

4 20HLK67/20HL67 75007305 LCDM T200XW02-V0(001) AUO

5 20HLK67/20HL67 75007302 PCBA MAIN BD T20WD8 MI

6 20HLK67/20HL67 75007303 PCBA KEYPAD BD T20WD8 MI

7

8 20HLK67/20HL67 75007301 PCBA PWR BD 70W EADP70BF A

20HLK67 75007315

ASSY CVR BASE STD

20HL67 75007306

20HLK67 75004561

ASSY BEZEL T20WH8

20HL67 75003719

20HLK67 75007312

PCBA IR BD T20WD8

20HL67 75007304

12

z 20HLK67

75007310

75004960

75003698

75004961

75007309

13

14