background image
SERVICE MANUAL
LCD COLOR TELEVISION
DOCUMENT CREATED IN JAPAN, September, 2005
20HL85
FILE NO. 050-200528GR
(MFR'S VERSION A)
The above model is classified as a green product (*1), as indicated by the underlined serial number.
This Service Manual describes replacement parts for the green product. When repairing this green
product, use the part(s) described in this manual and lead-free solder (*2).
For (*1) and (*2), see the next page.


background image
A1-1
(*1)
GREEN PRODUCT PROCUREMENT
The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling
and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of
certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any
marketing of new products containing lead.
Increasing attention is given to issues related to the global environmental. Toshiba Corporation
recognizes environmental protection as a key management tasks, and is doing its utmost to
enhance and improve the quality and scope of its environmental activities. In line with this,
Toshiba proactively promotes Green Procurement, and seeks to purchase and use products,
parts and materials that have low environmental impacts.
Green procurement of parts is not only confined to manufacture. The same green parts used in
manufacture must also be used as replacement parts.
(*2)
LEAD-FREE SOLDER
This product is manufactured using lead-free solder as a part of a movement within the CE
industry at large to be environmentally responsible. Lead-free solder must be used in the servicing
and repair of this product.
WARNING
This product is manufactured using lead free solder.
DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT !
The melting temperature of lead-free solder is higher than that of leaded solder by 86
°F to 104°F
(30
°C to 40°C). Use of a soldering iron designed for lead-based solders to repair product made
with lead-free solder may result in damage to the component and or PCB being soldered. Great
care should be made to ensure high-quality soldering when servicing this product
especially
when soldering large components, through-hole pins, and on PCBs
as the level of heat
required to melt lead-free solder is high.


background image
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
3. USE THE DESIGNATED PARTS
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a
mark, the designated
parts must be used.
5. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
PERFORM A SAFETY CHECK AFTER
SERVICING
6.
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
2.
3.
4.
Unplug the plug from the AC outlet.
Remove the antenna terminal on TV and turn
on the TV.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
4. BE CAREFUL WITH THE
LCD PANEL
Avoid a shock to the panel while servicing.
Take enough care to deal with it.
When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of
the heat sink. Befor applying new silicon grease, remove all the old silicon grease.
(Old grease may cause damages to the IC and Transistor.)
IMPORTANT
A1-2
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
HOW TO ORDER PARTS


background image
TABLE OF CONTENTS
GREEN PRODUCT PROCUREMENT ........................................................................................
LEAD-FREE SOLDER ................................................................................................................
SERVICING NOTICES ON CHECKING .....................................................................................
HOW TO ORDER PARTS ..........................................................................................................
IMPORTANT ...............................................................................................................................
TABLE OF CONTENTS ..............................................................................................................
GENERAL SPECIFICATIONS ...................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................
SERVICE MODE LIST ................................................................................................................
CONFIRMATION OF HOURS USED .........................................................................................
CONFIRMATION OF CHECK SUM ...........................................................................................
WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................
ELECTRICAL ADJUSTMENTS ..................................................................................................
BLOCK DIAGRAMS
SCALER/LVDS/MICON/ADC/JACK/AV_SW/REGULATOR ..................................................
AV_SW/TUNER/JACK/STEREO/SOUND AMP .....................................................................
POWER ...................................................................................................................................
INTERFACE .............................................................................................................................
MICON2 ...................................................................................................................................
AC ADAPTER ..........................................................................................................................
PRINTED CIRCUIT BOARDS
AV/OPERATION/REMOCON ..................................................................................................
SCALER ...................................................................................................................................
AC ADAPTER/HD-MI ..............................................................................................................
SCHEMATIC DIAGRAMS
AV SWITCH1 ...........................................................................................................................
TUNER/JACK ..........................................................................................................................
STEREO/SOUND AMP ...........................................................................................................
POWER ...................................................................................................................................
OPERATION/REMOCON ........................................................................................................
MICON1 ...................................................................................................................................
SCALER ...................................................................................................................................
ADC ..........................................................................................................................................
LVDS ........................................................................................................................................
JACK ........................................................................................................................................
AV SWITCH2 ...........................................................................................................................
REGULATOR ...........................................................................................................................
INTERFACE .............................................................................................................................
MICON2 ...................................................................................................................................
AC ADAPTER ..........................................................................................................................
WAVEFORMS .............................................................................................................................
MECHANICAL EXPLODED VIEWS ...........................................................................................
MECHANICAL REPLACEMENT PARTS LIST .........................................................................
ELECTRICAL REPLACEMENT PARTS LIST ...........................................................................
A1-1
A1-1
A1-2
A1-2
A1-2
A2-1
A3-1~A3-6
B-1, B-2
C-1
C-1
C-2
C-2~C-4
D-1~D-5
E-1, E-2
E-3, E-4
E-5, E-6
E-7, E-8
E-9, E-10
E-11, E-12
F-1~F-4
F-5, F-6
F-7, F-8
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
G-11, G-12
G-13, G-14
G-15, G-16
G-17, G-18
G-19, G-20
G-21, G-22
G-23, G-24
G-25, G-26
G-27, G-28
G-29, G-30
H-1~H-3
I-1~J-4
J1-1, J1-2
J2-1~J2-6
A2-1


background image
GENERAL SPECIFICATIONS
G-1
TV
LCD
LCD Size / Visual Size
20.04 inch / 508.9mmV
System
LCD Type
Color TFT LCD
Number of Pixels
1366(H) x 768(V)
View Range
Left/Right
89/89
degree
Up/Down
89/89
degree
Color System
NTSC
Speaker
2 Speaker
Position
Front
Size
1.8 x 3.9 inch
Impedance
16 ohm
Sound Output
Max
2.5W + 2.5W
10%(Typical)
---
G-2
Tuning
Broadcasting System
US System M
System
Tuner and
System
1Tuner
Receive CH
Destination
US (W/CABLE)
CH Coverage
2~69, 4A, A-5~A-1, A~I, J~W, W+1~W+84
Intermediate
Picture(FP)
45.75MHz
Frequency
Sound(FS)
41.25MHz
FP-FS
4.50MHz
Preset CH
No
Stereo/Dual TV Sound
US-Stereo
Tuner Sound Muting
Yes
G-3
Signal
Video Signal
Input Level
1 V p-p/75 ohm
Output Level
--
S/N Ratio (Weighted)
--
Horizontal Resolution at DVD Mode
--
--
RGB Signal
Output Level
--
Audio Signal
Input Level
-8.0dBm/50k ohm
Output Level
at DVD
--
at TV
--
Digital Output Level
--
S/N Ratio at DVD (Weighted)
--
Harmonic Distortion
--
Frequency Response :
at DVD
--
at Video CD
--
at SVCD
--
at CD
--
G-4
Power
Power Source
AC
120V, 60Hz
DC
--
Power Consumption
at AC
90W at 120V 60Hz
at DC
--
Stand by (at AC)
1W at 120V 60Hz
Energy Star
Yes
Per Year
-- kWh/Year
Protector
Power Fuse
Yes
Safety Circuit
Yes
IC Protector(Micro Fuse)
Yes
G-5
Regulation
Safety
UL/CSA(From O/R No. W563016)
Radiation
FCC/IC(From O/R No. W563016)
Laser
--
G-6
Temperature
Operation
+5oC ~ +40oC
Storage
-20oC ~ +60oC
G-7
Operating Humidity
Less than 80% RH
A3-1