Toshiba 46HM84 - 46" Rear Projection TV User manual

SERVICE MANUAL
Projection Television
46HM84
52HM84
62HM84
FILE NO. 020-200401
REVISED.2
Published in Japan, Jan. 2005 (YC)

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TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS .............................................................................................................................................. 3
SERVICE MODE ............................................................................................................................................................ 4
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ...................................................................................................................................... 7
LOCATION OF CONTROLS ........................................................................................................................................... 8
PROGRAMMING CHANNEL MEMORY ....................................................................................................................... 10
LAMP UNIT REPLACEMENT ....................................................................................................................................... 12
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 ..................................................................................................................... 29
TERMINAL VIEW OF TRANSISTORS ......................................................................................................................... 41
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 byusing
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 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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3. SELECTINGTHE 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-1 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 8)
4. ADJUSTINGTHE DATA
1) Pressing of VOLUME or button will change the value of data in the range from 00H to FFH.The variable range
depends on the adjusting item.
5. EXIT FROM SERVICE MODE
1) Pressing POWER button to turn off the TV once.
SERVICE MODE
1. ENTERING SERVICE MODE
MUTE
S
(Service mode display)
3) While pressing the MUTE button,
press MENU button onTV set.
2) Press MUTE button
again and keep pressing.
1) Press MUTE button twice
on Remote Control.
2. DISPLAYINGTHE ADJUSTMENT MENU
Adjustment mode
Press
Press
Service mode
Item
Data
S
1) Press MENU button on TV.

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6. 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 is executed properly.
2) During diagnosis, the following displays are shown.
Part number of microprocessor (IC609)
Operation number of protection circuit (The number of times of the power supply OFF by fan stop). . . .“000” is normal.
BUS line check “OK” ................... Normal
“SCL-GND” or “NG” ........... SCL-GND short circuit
“SDA-GND” or “NG” ........... SDA-GND short circuit
“SCL-SDA” or “NG” ............ SCL-SDA short circuit
BUS line ACK (acknowledge) check
“OK” ................... Normal
Sync.signal check Green display..... Normal
Red display ........NG
MAIN ........ Main sync
SUB .......... Sub sync (when turn on the PIP)
ID code for TV Set
Version of "EEP"
Data for "OPT"
SELF CHECK
NO. 23 * * * * * *
POWER : 000
BUS LINE : OK
BUS CONT : OK
BLOCK : MAIN SUB
SET ID : 80
E2P VER : 08
OPT1 : 00 OPT2 : A0
SW VER : DLE May 13 2004 17:**:**
HDMI
NO ********
ERR CDDE : 00
BEP
SW VER : 42
E2R VER : 02
TIME
TV : ******
LAMP :
****
Thermo1 : +51
Thermo2 : +50
Temperature of DMD
Temperature of the color wheel neighborhood
Software version history
HDMI Software
NO ***** .....Serial No.
ERR CODE .....Error Code
BEP Software Version
SW VER : **.....Version
E2P VER: ** EEP ROM Version
Use time
TV .....TV set on time (hour)
LAMP.....LAMP set on time (hour)
(It may shift from TV set on time.)

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7. 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:
. Green ON = Control touchpad being pressed.
. Red ON = Power ON.
. Green and/or Red blinking
(see table below for condition and solution).
MENUVOLUMECHANNELEXITTV/VIDEO POWER
Green indicator
Red indicator
Control touchpad on TV front
1
2
3
4
5
6
7
8
9
10
11
12
LED Indication
Red and Green turn off.
Red and Green turn off.
Red light solid and Green off.
Red and Green lights solid.
Green blinks at 1-second intervals;
Red off.
Green blinks at 0.3-second inter-
vals; Red lights solid.
Green lights solid and Red blinks
at 0.5-second intervals.
Green and Red blink at 1-second
intervals.
Red blinks at 0.5-second intervals;
Green off.
Red blinks at 1-second intervals;
Green off.
Red blinks three times;Green off.
Red and Green blink three times.
Condition
Power supply OFF.(AC)
Power supply OFF. (Standby)
(North America)
Power supply ON.
Touched the touchpad
Lamp LPS mode
The lamp is not working properly.
The lamp unit door is not seated
properly. (U)
The lamp is not working properly
after the third automatic reset (see
item #7). (U)
FAN (Light engine unit) has
stopped.
BUS line is damaged
The color wheel has stopped.
Temperature rises abnormally.
(U) is restoration by the user.
Solution
The TV automatically will try to reset itself
three times.
Turn the POWER OFF and unplug the power
cord. Review “How to replace the lamp unit”
on pages 12-14 to ensure that the lamp unit
door is installed securely.
Turn the POWER OFF and then ON again.If
the problem persists, replace the lamp unit
(see pages 12-14).
• Is the output voltage of the supply voltage
regulator for the FAN in the power circuit
normal?
• Has dust accumulated in the FAN?
If the output voltage is not abnormal,
replace the faulty FAN with a new one.
• Check the faulty device through the self
diagnostics function under SERVICE mode.
• Does BUS line (SCL, SDA) work normally?
If the BUS line is under abnormal
conditions, replace the faulty device with
a new one.
• Is the output voltage of the power supply
circuit normal?
If the output voltage is normal, replace the
engine with a new one.
• Is the ventilating hole in the set (exhaust
slot on the rear) blocked or covered?
• Is FAN rotating normally?
• Has dust accumulated in the ventilating
hole?
If no abnormally conditions are found,
replace the engine with a new one.

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SETTING & ADJUSTING DATA
CHAPTER 2 SPECIFIC INFORMATIONS
SERVICE MODE
ADJUSTING ITEMS AND DATA INTHE SERVICE MODE:
Item Name of adjustment Preset Data
Table-1
RCUT R CUT OFF
GCUT G CUTOFF
BCUT B CUT OFF
RDRV R DRIVE
GDRV G DRIVE
BDRV B DRIVE
BRTC BRIGHT CENTER
SCNT
SUB CONTRAST FOR TV
COLC COLOR CENTER
UVTT BASE BAND TINT
CNTX SUB CONTRAST MAX
HPOS H-POSITION (PAL/DFS)
VPOS
V-POSITION DC SHIFT (PAL/DFS)
CWDH COLOR WHEEL DELAY (HIGH)
CWDL COLOR WHEEL DELAY (LOW)
DMDB DMD BIAS
OPT0 TV SET OPTION 1
Note:
The image system data of RCUT-CNTX is different by each image format.
The NTSC value is indicated in the table.
60H
60H
64H
48H
53H
5FH
76H
20H
D0H
40H
7FH
00H
00H
00H
FAH
03H
00H
A0H
40H
14H
03H
0FH
05H
14H
04H
23H
4AH
63H
6FH
73H
20H
91H
24H
73H
01H
Item Name of adjustment Preset Data
OPT1 TV SET OPTION 2
TVOP TV OPTION
PLLW0 PLL WAIT TIME
PLLW1 PLL WAIT TIME
PLLW2 PLL WAIT TIME
PLLW3 PLL WAIT TIME
PLLW4 PLL WAIT TIME
PLLW5 PLL WAIT TIME
V01 VOLUME (DATA)
V25 VOLUME (DATA)
V50 VOLUME (DATA)
V75 VOLUME (DATA)
V100 VOLUME (DATA)
MODH MODUS DATA HIGH
MODL MODUS DATA LOW
PRES FMAM PRESCALE
SCTH
VOLUME SCART OPTION HIGH
SCTL VOLUME SCART OPTION LOW

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LOCATION OF CONTROLS
Front
Remote sensor
(Behind the screen)
Video 3
Video/audio inputs
MENU
TV/VIDEO
EXIT zyx •
ANT-2
IN
ANT-1
IN
POWER
Push to open.
ANT OUT
MENUVOLUMECHANNELEXITTV/VIDEO POWER
MENUVOLUMECHANNELEXITTV/VIDEO POWER
AUDIO
IN
* Green ON = Touchpad key being pressed;
Red ON = Power ON.
See page 60 for additional LED indications.
Channel zy
Volume x• Green and Red
LED indicators*
Side
Control touchpad on TV front ( Gently touch the printed keys.)
Front
Back
deo/aud o pu s
HDMI IN
ANT-2
IN ANT-1
IN
VIDEO 1/2
ColorStream
HD1/HD2
Audio OUT
Push to open.
ANT OUT
AUDIO
IN
Variable
Audio OUT
Back

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Remote Control
123
456
789
ENT
100
0
POWER
RECALL
CHRTN
FAV
FAV
TV / VIDEO
+10
PIC SIZE
EXIT
INFO
STOP
POP DIRECT CH MUTE SLEEP
TV/VCR PAUSE
FFREW
SKIP/SEARCH
SPLIT
SWAP POP CH
LIGHT
REC
CH SCAN
FREEZE SOURCE
PLAY
TV
CBL/SAT
VCR
DVD
VOLCH
FAVORITE
ENTER
DVDMENU
MENU
T
O
P
M
E
N
U
G
U
I
D
E
C
L
E
A
R
E
N
T
E
R
Note:
The error message “Not Available” will appear
if you press a key for a function that is not
available.
POWER turns the TV on and off
RECALL displays screen information
SLEEP sets the TV to turn off at a specific time
TV/VIDEO selects video input source
MUTE mutes the sound
Device Switch switches between TV, CBL/SAT, VCR and DVD
Set to “TV” to control the TV.
CH (channel) yz cycles through programmed channels
Channel Numbers (0-9, 100) allow direct access to channels
VOL (volume) yz adjusts the volume level
CH RTN returns to the memorized channel
MENU allows access to on-screen programming menus
ENTER activates the function settings in the menu
yzx• select or adjust programming menus
POP CH yz selects the POP (picture-out-picture) channel
FAV yz cycles through favorite channels
FAVORITE allows access to the favorite channel search function
PIC SIZE cycles through the five picture sizes: Natural, Theater Wide
1, 2, 3, and Full
EXIT exits programming menus
SPLIT turns the POP feature on and off
SOURCE selects the POP picture source
FREEZE freezes the picture. Press again to restore the picture.
SWAP switches the main and POP pictures
POP DIRECT CH allows direct access to POP channels
CH SCAN allows access to the programmed channel search function
LIGHT illuminates the keypad for five seconds

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PROGRAMMING CHANNEL MEMORY
Adding channels to the TV’s memory
When you press Channel yor z, your TV will stop only on the
channels stored in the TV’s channel memory.
Follow the steps below and on the next page to program all active
channels into the TV’s memory.
Programming channels automatically
Your TV can automatically detect all active channels in your area and
store them in its memory. After the channels are stored automatically,
you can manually add or erase individual channels (see page 25).
To program channels automatically:
1. Press MENU, and then press xor •until the SET UP menu
appears.
2. Press yor zuntil the TV/CABLE is highlighted, and then press
ENTER to display the pull-down menu.
3. Press yor zto highlight either TV or CABLE, depending on
which you use. If you use an antenna, highlight TV; if you use
cable, highlight CABLE.
LANGUAGE
SET UP
CLOCK SET
TV
CABLE
ANT 1 / 2
TV / CABLE
CH PROGRAM
ADD / ERASE
SELECT::SETENTER
4. Press ENTER.
5. Press zto select CH PROGRAM.
LANGUAGE
SET UP
CLOCK SET 00:00
ENGLISH
ANT 1 / 2 ANT1
TV / CABLE CABLE
ADD
CH PROGRAM
ADD / ERASE
MOVE::STARTENTER
6. Press ENTER to start channel programming. The TV will
automatically cycle through all the TV or Cable channels
(depending on which you selected), and store all active channels
in the channel memory.
While the TV is cycling through the channels, the message
“Programming Now—Please Wait” appears.
7. When channel programming is complete,the message
“Completed” appears.
8. Press Channel yor zto view the programmed channels.
123
456
789
ENT
100
0
POWER
RECALL
CHRTN
FAV
FAV
TV/ VIDEO
+10
PIC SIZE
EXIT
INFO
STOP
POP DIRECT CH MUTE SLEEP
TV/VCR PAUSE
FFREW
SKIP / SEARCH
SPLIT
SWAP POP CH
LIGHT
REC
CH SCAN
FREEZE SOURCE
PLAY
TV
CBL/SAT
VCR
DVD
VOLCH
FAVORITE
ENTER
DVDMENU
MENU
T
O
P
M
E
N
U
G
U
I
D
E
C
L
E
A
R
E
N
T
E
R
MENU
yzx •
Channel yz
Note:
To tune the TV to a channel not programmed
in the channel memory, you must use the
Channel Number buttons on the remote
control.
ENTER