Toshiba 46WM48P User manual

SERVICE MANUAL
Projection Television
46WM48P
FILE NO. 030-200419
REVISED.1
Published in Japan, Dec. 2004 (YC)

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TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS .............................................................................................................................................. 3
SERVICE MODE ............................................................................................................................................................
.............................................................................................................................................................
.........................................................................................................................................
.......................................................................................
...............................................................................................................................................
4
DESIGN MODE 7
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ...................................................................................................................................... 9
LOCATION OF CONTROLS
Tuning the television using Quick setup, Programme sorting 12
LAMP UNIT REPLACEMENT ....................................................................................................................................... 13
PARTS REPLACEMENT IN LIGHT ENGINE...............................................................................................................
15
LIGHT ENGINE REPLACEMANT.................................................................................................................................
17
EXPLODED VIEW ........................................................................................................................................................ 19
MECHANICAL DISASSEMBLY .................................................................................................................................... 20
CHASSIS REPLACEMENT PARTS LIST ..................................................................................................................... 21
PC BOARDS TOP AND BOTTOM VIEW ..................................................................................................................... 30
10
SCHEMATIC DIAGRAM 42
CIRCUIT BLOCK DIAGRAM ........................................................................................................................................ 44
SPECIFICATIONS .................................................................................................................................................... END
APPENDIX:
CIRCUIT DIAGRAM

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Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are
often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety charac-
teristics are identified in this manual and its supplements; electrical components having such features are identified by the
international hazard symbols on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety character istics as specified in the parts list may create shock, fire, or other hazards.
PRODUCT SAFETY NOTICE
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS
WARNING: Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver.The following
are the necessary precautions to be observed before servicing this chassis.
1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is
performed on the receiver.
2. When the replacing a chassis in the cabinet, always be certain that all the prospective devices are put back in place, such
as; non-metallic control knobs,insulating covers, shields, isolation resistor-capacitor network etc.
SAFETY PRECAUTION

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SERVICE MODE
1. ENTERING TO SERVICE MODE
S
(Service mode display)
Item
Data
or Sound Mute
3) While pressing the button,
press MENU button on TV set.
2) Press button again to
keep pressing.
2. DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.
3. KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
Test signal selection : button (on Remote)
Selection of the adjustment items : Channel / (on TV or Remote)
Change of the data value : Volume +/– (on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : CALL + Channel button on TV ( )
Reset the count of operating protect
circuit to “00”: CALL + Channel button on TV ( )
“RCUT” selection : button
“GCUT” selection : button
“BCUT” selection : button
Self diagnostic display ON/OFF : button
1) Press button once on
Remote Control.
Adjustment mode
Press
Press
Service mode
Item
Data
S
CAUTION : Never try to perform initialization unless you have changed the memory IC.
2
3
1
9

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4. SELECTING THE ADJUSTING ITEMS
1)Every pressing of CHANNEL button in the service mode changes the adjustment items in the order of table-2.
( button for reverse order)
Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 27)
5. ADJUSTING THE DATA
1) Pressing of VOLUME +/– button will change the value of data in the range from 00H to FFH. The variable range
depends on the adjusting item.
6. EXIT FROM SERVICE MODE
1) Pressing POWER button to turn off the TV once.
INITIALIZATION OF MEMORY DATA OF QA02
After replacing QA02, the following initialization is required.
1. Enter the service mode, then select any register item.
2. Press and hold the CALL button on the Remote, then press the CHANNEL button on the TV. The initialization of QA02 has
been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Auto tune” on the owner’s manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.
7. TEST SIGNAL SELECTION
1) Every pressing of button on the Remote Control changes the built-in test patterns on screen as described below
in SERVICE MODE.
Signals Picture
• All White
• All Red
• All Green
• All Blue
• All Black
Signal off
ALL Red ALL Green ALL Blue ALL Black ALL White

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8. SELF DIAGNOSTIC FUNCTION
1) Press “9” button on Remote Control during display of adjustment menu in the service mode.
The diagnosis will begin to check if interface among IC’s are executed properly.
2) During diagnosis, the following displays are shown.
Firmware:
V
Temperature indication
+10 indicates temperature nearby the lamp unit
+99 indicates temperature nearby the light engine
ersion information of microprocessor
In case of file name : WM48 and Version : 1.00 indicates[WM48_100].
Time: Total Total hour of Lamp lights. (Unit : H)hour of turn the TV on. (Unit : H)
Power : Operation number of protecting circuit ----"00" is normal.
When indication is other than "00", overcurrent apt to flow, and circuit parts may
possibly be damaged.
BusCont : --- "OK" is normal.
When type name of semiconductor indicates.
1
2
3
4
5
1
2
3
4
5
6
7
6
1)
2)
BLOCK
3)
UV : TV reception mode
4)
V1 : VIDEO 1 input mode (
5)
V2 : VIDEO 2 input mode (
V3 : VIDEO 3 input mode (
V4 : VIDEO 4 input mode (
V5 : VIDEO 5 input mode (
HDMI)V6 : HDMI input mode (
PC)PC: PC input mode (
7Model name (7 digit)
46WM48P
DLP +10
V6
: +99
WM48_000
000006 (Lamp:000006)

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DESIGN MODE
1. ENTERING TO DESIGN MODE
S D Press
(Design mode)
Press
2) While pressing CALL button on Remote
and press MENU button on TV.
1) Select the Service mode.
2. SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL button in the design mode changes the adjustment items in the order of table-3.
( button for reverse order)
3. ADJUSTING THE DATA
Pressing of VOLUME or button will change the value of data.
Version information of
microprocessor
Main tuner information
Selectable picture information
Position information
Signal information
Screen size information
Sound system information
3) The following displays
are shown on the screen
1
2
3
4
5
6
7
WM48_000
1
34567
2
WM48_000

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RED indicator
GREEN indicator
Control touchpad on TV front
MENUEXIT
4. LED indications
The green and red LED lights on the TV control
touchpad (on the lower right Corner of the TV screen)
indicate the TV's current status, as follows:
·Red ON (solid) and Green OFF = TV power cord is
plugged in (the TV is ON or OFF).
·Green ON (solid) and Red OFF = The On timer is
operating.
·Green and Red ON (solid) = TV front touchpad is
being pressed.
·Green flashing (see table below for condition).
On timer set
2
3
7
8
1
6
5
4
Lowest ON
Abnormal operation (FAN stopped) 500ms ON, 500ms OFF
BUS line has failed. (IIC BUS error) 1sec ON, 1sec OFF
Lamp LPS (Low Power Standby) mode
(200ms ON · 200ms OFF)x1 Time, 1sec OFF
The lamp lights again. (200ms ON · 200ms OFF)x2 Times, 1sec OFF
The lamp unit door is not closed properly. (200ms ON · 200ms OFF)x3 Times, 1sec OFF
The lamp is not lightning properly. (200ms ON · 200ms OFF)x4 Times, 1sec OFF
The color wheel has stopped, DMD bus error (200ms ON · 200ms OFF)x5 Times, 1sec OFF
Temperature increases abnormally. (200ms ON · 200ms OFF)x6 Times, 1sec OFF
ProblemPriority Green LED Operation

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SETTING & ADJUSTING DATA
CHAPTER 2 SPECIFIC INFORMATIONS
SERVICE MODE
ADJUSTING ITEMS AND DATA IN THE SERVICE MODE:
Item Name of adjustment Preset Deta
46WM48P
Table-1
RCUT R CUT OFF
GCUT G CUTOFF
BCUT B CUT OFF
RDRV R DRIVE
GDRV G DRIVE
BDRV B DRIVE
HPOS
H.POSITION (PAL/WIDE)
VPOS V.POSITION (PAL/WIDE)
CWDH COLOR WHEEL DELAY (HIGH)
CWDL COLOR WHEEL DELAY (LOW)
DMDB DMD BIAS
OPT0 TV SET OPTION 0
OPT1 TV SET OPTION 1
HOTE1
HOTEL MODE OPTION 1
HOTE2 HOTEL MODE OPTION 2
UOLX
Note:
The image system data of RCUT-BDRV is different by each image format.
The PAL value is indicated in the table.
Never adjust H.POS and V.POS except PAL/WIDE mode.
60H
60H
60H
55H
48H
4BH
00H
00H
00H
FAH
03H
8CH
00H
00H
00H
75H
OPT1 should be set to "20H" for UK shipment model.

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LOCATION OF CONTROLS
Back
Front
IN
OUT
IN
OUT
HDMI
video recorder
decoder
COMPONENT VIDEO INPUT (EXT4)
HDMI™
Connecting a computer
INPUT
SAT
IN/OUT
VCRTV
SCART1
(EXT1)
SCART2
(EXT2)
SCART3
(EXT3)
MENUEXIT
Standby
RED LED–Power On
GREEN LED
INPUT 5
(EXT5)