Toshiba 52HM85 User manual

SERVICE MANUAL
Projection Television
52HM85
62HM85
FILE NO. 020-200506
(REVISED.1)
Published in Japan Nov. 2005 (YC)
TOSHIBA CORPORATION 2005

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TABLE OF CONTENTS
SAFETY INSTRUCTIONS .............................................................................................................................................. 3
SERVICE MODE ............................................................................................................................................................ 4
SETTING & ADJUSTING DATA ...................................................................................................................................... 7
LAMP UNIT REPLACEMENT......................................................................................................................................... 8
PARTS REPLACEMENT IN LIGHT ENGINE...............................................................................................................
11
LIGHT ENGINE REPLACEMANT.................................................................................................................................
13
EXPLODED VIEW........................................................................................................................................................ 15
MECHANICAL DISASSEMBLY.................................................................................................................................... 16
CHASSIS REPLACEMENT PARTS LIST ..................................................................................................................... 17
PC BOARDS TOP AND BOTTOM VIEW ..................................................................................................................... 24
TERMINAL VIEW OF TRANSISTORS ......................................................................................................................... 36
CIRCUIT BLOCK DIAGRAM ........................................................................................................................................ 39
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 ha ard 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 ha ards.
PRODUCT S FETY NOTICE
S FETY 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.
S FETY PREC UTION

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3. SELECTING THE DJUSTING 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 7)
4. DJUSTING THE D T
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 on TV set.
2) Press MUTE button
again and keep pressing.
1) Press MUTE button twice
on Remote Control.
2. DISPL YING THE DJUSTMENT MENU
Adjustment mode
Press
Press
Service mode
Item
Data
S
1) Press MENU button on TV.

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6. SELF DI GNOSTIC 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 (IC601)
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 Solid (not blinking) = Control touchpad
. Red ON Solid (not blinking) = 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 eight automatic restart
(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 restart
itself eight times.
Turn the POWER OFF and unplug the power
cord. Review "Lamp Unit Replacement" on
pages 8-10 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 8-10).
• 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.
being pressed.

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SETTING & DJUSTING D T
SERVICE MODE
DJUSTING ITEMS ND D T IN THE 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 0
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 1
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

L MP UNIT REPL CEMENT
The light source for this TV is a mercury lamp with internal atmospheric
pressure that increases during use. The lamp has a limited service life
that varies depending on user settings. If you use the lamp beyond its
service life:
you may notice a reduction in the colors and/or brightness of the pic-
ture; and





the strength of the quart glass in the lamp will be reduced and the
lamp may rupture (often making a loud noise when this happens). If
the lamp reputres, the TV will not operate until the lamp unit is replaced.
Note: The lamp unit is designed so broken lamp glass remains se-
curely inside the lamp unit.
C UTION: lways handle the lamp unit with care.
The lamp unit in this TV was designed for safe replace-
ment by consumers; however, if the lamp unit is subjected to inten-
tional abuse (such as excessive mechanical abuse or handling by
children or pets), the unit may break, exposing edges or pinch points.
When to replace the lamp unit
You should replace the lamp unit:
if the picture darkens and/or colors fade;
if the lamp does not light; or
If you hear a loud noise and the picture goes black, which may indi-
cate a lamp rupture (LED indication #8). See LED indications on
page 6.
Cautions when replacing L MP UNIT (E998Z; PJ-D95-LMP)
Note: The lamp unit is designed so broken lamp glass remains se-
curely inside the lamp unit.
Note: Be sure wear the gloves before replacing the lamp unit.
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1. Turn off the TV and unplug the power cord.
2. STOP! Allow the lamp to cool for at least one (1) hour
before replacing it.
3. On the back of the TV, loosen the thumb screw (by hand)
on the lamp unit door, and then remove the lamp unit
door.
4. Using a manual screwdriver, loosen two screws on the
lamp unit.
5. Grasp the lamp unit handle and gently pull the lamp unit
straight out of the TV. Set the old lamp unit aside.
6. Carefully insert the new lamp unit straight into the TV
until it is fully seated.
Note :
Never subject the lamp unit to excessive shock.
Never touch the lamp unit glass or otherwise get it
dirty.
Doing so may affect the image quality and reduce
the service life of the lamp. See “Cleaning the lamp
unit glass” below.
7. Using a manual screwdriver, tighten two lamp unit
screws.
Note:Hand-tighten only. Do not use an electric screw-
driver.
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8. Reattach the lamp unit door, making sure to insert the
hook on the left side of the lamp unit door inside the
opening in the TV cabinet.
9. Replace the thumb screw and hand-tighten.
10. Plug in the power cord and turn on the TV. After the
initial warmup period (which may take up to 45 seconds
for full picture brightness), the TV should operate nor-
mally. If any of the following conditions exist, turn off the
TV, unplug the power cord, and repeat steps 1-9 to en-
sure that the lamp unit and lamp unit door are installed
correctly:
No picture
Dark picture
TV will not turn on