Toshiba 38VL14G User manual

TOSHIBA CORPORATION
1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
PRINTED IN JAPAN May., 2001 T
FILE NO. 010-200102
SERVICE MANUAL
COLOUR TELEVISION
F0LP Chassis
38VL14G

– 2 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS........................................................................................................................................3
SERVICE MODE ......................................................................................................................................................4
DESIGN MODE ........................................................................................................................................................7
ELECTRICALADJUSTMENTS ................................................................................................................................8
SCREEN AND MIRROR ALIGNMENTS ................................................................................................................13
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ..............................................................................................................................14
LOCATION OF CONTROLS...................................................................................................................................15
PROGRAMMING CHANNEL MEMORY.................................................................................................................17
CIRCUIT BLOCK DIAGRAM ..................................................................................................................................19
MECHANICAL DISASSEMBLY ..............................................................................................................................21
CHASSIS AND CABINET REPLACEMENT PARTS LIST......................................................................................23
PC BOARDS LAYOUT TOPVIEW..........................................................................................................................45
PC BOARDS BOTTOMVIEW.................................................................................................................................47
TERMINAL VIEW OF TRANSISTORS ...................................................................................................................54
SPECIFICATIONS ..................................................................................................................................................57
APPENDIX:
CIRCUIT DIAGRAM

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS
SAFETY PRECAUTION
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 protective devices are put back in place, such as; non-
metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.
PRODUCT SAFETY NOTICE
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 char-
acteristics 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 characteristics as specified in the parts list may create shock, fire or other hazards.
LAMP REPLACEMENT CAUTION
When replacing the lamp of LCD projection TV, use Lamp Module Kit.
Be sure to read the caution in the instruction manual before replacing.

– 4 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
SERVICE MODE
1. ENTERING TO SERVICE MODE
S
(Service mode display)
Item
Data
3) While pressing the obutton,
press MENU button on TV set.
2) Press obutton 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.
Frequency of lamp replacement CALL + RGB button
Test signal selection : abutton (on Remote)
Selection of the adjustment items : Channel s/t(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 (s)
“CSBRT” selection : 1 button
“SCNT” selection : 4 button
“COLP” (or “OTHER”) selection : 5 button
“TNTC” (or “TNTV”) selection : 6 button
Self diagnostic display ON/OFF : 9 button ............. note: Displayeddifferentlyasshownbelow,dependingonthe
setting of the receiving color system.
COLP (PAL)
COLC (NTSC)
COLS (SECAM)
1) Press obutton 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.

– 5 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
4. SELECTINGTHE ADJUSTING ITEMS
1) Every pressing of CHANNEL sbutton in the service mode changes the adjustment items in the order of table-2.
(tbutton for reverse order)
Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 14)
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 CHANNELsbutton on the TV.The initialization of QA02 has
been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Auto search Memory” 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 abutton on the Remote Control changes the built-in test patterns on screen as described below
in SERVICE MODE.
Signals Picture
• Red raster
• Green raster
• Blue raster
• All Black
• All White
• Black & White
• Black cross-hatch
• White cross-hatch
• Black cross-dot
• White cross-dot
• Black cross-bar
• White cross-bar
• Black cross-bar
on green raster
• H signal (white)
• H signal (black)
*The signals marked with are not usable to display in theTest signal for some model.
Signal off NTSC signals (14 patterns)
PAL signals (14 patterns)

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
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.
23******
TIME : 000000
LAMP : 0000 00
BUS LINE : OK
BUS CONT : OK
BLOCK : UV V1 V2
QV01


<SELF CHECK>
Part number of microcomputer (QA01)
Toral hour of turn the TV on.
(unit: H, Max. 999999 hours)
Showing the operation hour of lamp.
(unit H, Max. 9999 hours)
LAMP : 0000 00
Frequency of lamp replacement.
(0~99)
Showing a count 1 by “CALL + RGB” button in “Serv-
ice mode.”
BUS LINE CHECK----“OK” is normal.
“SDA1-GND” ---------- SDA-GND short circuit.
“SCL1-GND” ---------- SCL-GND short circuit.
“SCL1-SDA1” --------- SCL-SDA short circuit.
BUS CONT --- “OK” is normal.
Whenindication shows “Q uuu NG”, the devicewith
the number may possibly be damaged.
BLOCK
UV :TV reception mode
V1 : VIDEO 1 input mode (a1)
V2 : VIDEO 2 input mode (a2)






*The items marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.
Indicated color of mode now selected : Green and Red
Indicated color of other modes : Blue
Green :Normal
Red : Themicrocomputeroperatestoprovidejudgement
of no video signal. The red color is still indicated
thoughthe signal is input, failure may exist in input
signal line including QV01.
QV01 : In case of indication green ---Normal
In case of indication red with input signal----
Failure may exist in output line including QV01.
NOTE: (1)In case that power indicator is blinking with in-
terval of 1 second; A part of Bus line does not
operate normally.Check Bus line.

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
DESIGN MODE
1. ENTERING TO DESIGN MODE
ITEM
DATA
S D Press
(Design mode) (Adjustment mode)
Press
3) Press MENU button on TV.
2) While pressing CALL button on Remote
and press MENU button on TV.
1) Select the Service mode.
2. SELECTINGTHE ADJUSTING ITEMS
Every pressing of CHANNEL tbutton in the design mode changes the adjustment items in the order of table-3.
(sbutton for reverse order)
Refer to table-3 for data of design mode.
(See SETTING & ADJUSTING DATA on page 14)
3. ADJUSTINGTHE DATA
Pressing of VOLUME sor tbutton will change the value of data.
When QA02 is initialized, items “OPT0” and “OPT1” of DESIGN MODE are set to the data of the representative model of this
chassis family.
Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to
reset the data of items “OPT0” and “OPT1”.

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
ELECTRICAL ADJUSTMENTS
(Reference factory adjustment)
F0LP Series Completing adjustment
Adjustment Input Point Adjusting Adjusting Conditions and Procesures
Items Output Point
Signal
Vertical phase (VPOS) Horizontal phase (HPOS) Bright adjustment (CSBRT) and white balance adjustment RDRV BDRV Sub-light adjust- ment (BRTC)
Visual adjustment by patterns (BUS control) Visual adjustment by patterns (BUS control) W/B checker (CA110) (Set condition: dy- namic) Visual adjustment by patterns (Set condition: dy- namic)
WG Phillips Pattern Sub Bright (NTSC) signal Do not use Phillips Pattern of FRANCE SECAM WG Phillips pattern Do not use Phillips Pattern of FRANCE SECAM CSBRT Adjusting signals (100% all white signals) 501RE W/B adjusting signals Sub-bright signals (J2ch)
Adjust by SUB address VPOS so that the up and down positions of the circle on Phillips Pattern will come to the center. Adjust by SUB address HPOS so that the left and right vertical bars of Phillips Pattern will look equal. Connect the CSBRT adjusting signals to the video input. Install the W/B checker on the screen. Select CSBRT at adjusting mode.
(The CSBRT data is changed to 52 from the initial value by a microcomputer, and both screen brightness will turn to MAX.)— To be dealt with by the production line
Adjust the CSBRT data so that the brightness at the time turns to (Normally White) x A%.
(When the data is adjusted, the SCBRT data returns to the initial value and screen brightness declines) A = 70±5 %
Connect the 501RE white signals to the video input and adjust by RDRV and BDRV so that they
will come to the following values. x = 0.280±0.005
y = 0.330±0.005
As shown in again, repeat after adjusting the CSBRT data.
Select BRTC at adjusting mode. Visually checked number of collapsed black lines :4±1.5 lines

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Adjustment Input Point Adjusting Adjusting Conditions and Procesures
Items Output Point
Signal
Ghost adjustment (GHST) Flicker adjustment (FLCK)
Visual adjustment by patterns (BUS control) (Set condition: ) Visual adjustment by patterns (BUS control) (Set condition: )
Crosshatch signal (E4ch) Retma signal (E7ch)
Set to GHST adjusting mode.
Adjust by moving the data up and down so that the ghost will not appear on the left or right of the
screen’s vertical line.
* The ghost mentioned here is defined as the shadow that appears on the left or right of the 6th
pixel of image signal on the screen.(See illustration below)
Set to FLCK adjusting mode.
Move the FLCK data up and down to minimize the flicker while viewing the screen.
Ghost image (when the ghost appeared on the right)
Signal Ghost

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Unit adjustment
Items Names Settings Input signals Measuring points
Measuring
Adjusting conditions and Adjusting standards
instruments
procedures
Contrast: MAX Bright: CNT Color: CNT * Selectable picture:
Dynamic
Contrast: MAX Bright: CNT Color: CNT * Selectable picture:
Dynamic
Contrast: MAX Bright: CNT Color: CNT * Selectable picture:
Dynamic
Sub-bright signal (J2ch) PAL sub-bright signal (UK23ch) SECAM color bar (E2ch)
TP46B TP46B TP46B
Select SCNT and adjust the
amplitude from the pedestal level to the white peak.
Select COLP. Adjust the amplitude of color bar’s
part. (P-P value of upper half)
Select COLS. Adjust the amplitude of color bar’s
part. (P-P value of upper half)
2.0 ±0.1 V (p-p)
0.9±0.1V (p-p)
* P-P value of
upper half
1.3±0.1V (p-p)
* P-P value of
upper half
[SCNT] [COLP] [COLS]
Sub-contrast Sub-color center PAL Sub-color center SECAM
Synchro Synchro Synchro

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Items Adjusting methods and standard values
RGB DRIVE PCB
Connect the output signals (R, G, B, HD,VD) of the ED scan converter (PV3000) and I2C bus line to the pedestal. Input signal is [white 100% raster
signal]
Start I2C communication using the jig. Adjust items 1 ~ 7.
(Align the positive and negative levels by varying the levels of items 1 ~ 4, and 6 (point of mark →[arrow mark] of Fig.1) For adjusting waveforms, refer to Fig.2 and Fig.3.
Items
Measuring
Adjusting Symbols Adjusting methods and adjusting values
terminals
locations
1 2 3 4 5 6 7
R+center R–center G–center B–center R1 + center R1 center Black limiter
R+ R– G– B– SIGC R1 R+
R9992 R9375 R9751 R9752 R9750 R9754 R950
SIGCTR RSIGC GSIGC BSIGC SIGC CVB+ BLKLIM
Adjust the R + waveform as shown in Fig. 1 using an oscilloscope Adjusting value 6.50V±0.01V Adjust the R – waveform as shown in Fig. 1 using an oscilloscope Adjusting value 6.50V±0.01V Adjust the G - waveform as shown in Fig.1 using an oscilloscope Adjusting value 6.50V±0.01V Adjust the B - waveform as shown in Fig.1 using an oscilloscope Adjusting value 6.50V±0.01V Adjust the voltage of SIGC land using a digital voltmeter Adjusting value 6.50V±0.01V Adjust the R1 waveform as shown in Fig.2 using an oscilloscope Adjusting value 6.50V±0.01V Adjust the R + positive waveform as shown in Fig.3 using an oscilloscope Adjusting value 2.0V±0.1V
Power
source
SG Jig RGB drive PCB Personal
computer
or
jig
R, G, B, HD, VD
PV3000
<System Configuration>

– 12 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Items Adjusting methods and standard values
RGB DRIVE PCB
Fig.1 Adjusted waveform Fig.3 Adjusted waveform
Adjust to 6.50V Adjust to
2.0V
Fig.2 Adjusted waveform
Adjust to 5.00V

– 13 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
SCREEN AND MIRROR ALIGNMENTS
CAUTION : Do not hold the optical system parts (lens and
mirror) with bare hand to avoid finger-prints on
the surface of those parts.
HOW TO CLEAN LENS AND MIRROR
1. Be sure to remove sand dust with an air brush, etc.
2. When it is stained slightly, breathe upon it and wipe away
with the specified cleaning cloth.
For other stains than the above, wipe the stains away with
the specified cloth into which a cleaning liquid has been
soaked.
Cleaning liquid ................... LENS LUSTER (Manufactured
by Edmund Scientific Co.), etc.
HOW TO CLEAN SCREEN
When cleaning the screen, use a soft cloth so as not to dam-
age the screen.
1. Wipethestain away with a diluted neutral detergentsoaked
cloth.
2. Wipe the detergent away with a water soaked cloth.
3. Wipe the screen with a dry cloth to remove moisture on the
screen.
Note : Absolutely do not use alcohol, benzine, thinner, etc.
for cleaning in order not to wipe away the black print
on the surface.
Lenticular sheet
Fresnel sheet
FRONT
Lenticular sheet
Fresnel sheet
Label with part
number
FRONT
Label with part
number
Stick cotton
cloth tape
ASSEMBLING OF
FRONT SCREEN MOUNTING OF
FRONT SCREEN
CLEANING OF LENS AND MIRROR
Front panel

– 14 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA
CHAPTER 2 SPECIFIC INFORMATIONS
SERVICE MODE
ADJUSTING ITEMS AND DATA INTHE SERVICE MODE:
Item Name of adjustment
R DRIVE
B DRIVE
SUB CONTRAST MAX
SUB BRIGHTNESS CENTER
SUB COLOR CENTER NTSC
SUB COLOR CENTER PAL
SUB COLOR CENTER SECAM
SUB CONTRAST TV
EXT PRE.VOL
VOL SCART
FM VOL PRESCALE
NICAM VOL PRESCALE
NICAM THRESHOLD LEVEL
NICAM THRESHOLD LEVEL
IGR THRESHOLD LEVEL
IGR THRESHOLD LEVEL
RDRV
BDRV
CNTX
BRTC
COLC
COLP
COLS
SCNT
EVOL
VOLS
FVOL
NVOL
NICL
NICH
IDL
IDH
Preset
35H
1EH
7FH
80H
2BH
2BH
2BH
0DH
01H
75H
15H
00H
00H
00H
00H
00H
Item Name of adjustment Preset
Table-1
Table-2
DESIGN MODE
ADJUSTING ITEMS AND DATA INTHE DESIGN MODE:
EXM
EMN
PHS
STS
HOPS
VPOS
TNTC
SBY
SRY
CMBRT
RMBRT
BMBRT
CSBRT
FLCK
GHST
NICAM ON LEVEL
NICAM OFF LEVEL
—
—
H-POSITION
V-POSITION
SUB TINT CENTER TV
SECAM B-Y
SECAM R-Y
—
—
—
SUB BRIGHTNESS
FLICKER
GHOST
FCH
64H
16H
00H
00H
00H
20H
04H
07H
A9H
9AH
A1H
9FH
B4H
08H
Item Name of adjustment Preset Data
OPT0
OPT1 00H 02H
OPTION 0
OPTION 1

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Q(2)
(AUDIO/VIDEO)
a2S
(S-VIDEO)
Q(2)
(AUDIO/VIDEO)
a2S
(S-VIDEO)
Q(1)
(AUDIO/VIDEO)
Q(4)
(AUDIO/VIDEO) (FIXED)
Q(3)
(AUDIO/VIDEO)
a3S
(S-VIDEO)
Y
P
B /C B
P R /C R AUDIO
L
R
AUDIO
L
R
COMPONENT
VIDEO INPUT WOOFER OUT
Front
Back
]Aerial input
LOCATION OF CONTROLS
(3)
S-VIDEO VIDEO L/MONO R
AUDIO
RGBRGB
MENU EXIT
CH
RGB
LAMP
POWER switch
Remote sensor
POWER indicator
ON-TIMER indicator
Behind the door
RGB IN
EXT3 IN
(S-video/video/
autio)
RGB on/off Headphones jack
(3.5 mmø, stereo)
MENU
EXIT Volume ts
Programme position ts
EXT3 IN/OUT
(Scart-3) WOOFER OUT
EXT2 IN/OUT
(Scart-2) EXT1 IN/OUT (Scart-1) EXT4 IN
(Component video input)
FIXED AUDIO OUT

– 16 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Remote Controller
F
TEXT
CALL
TV
SIZE
VTR/DVD
VTR/DVD
EXIT
3
6
9
2
5
8
1
4
7
P
P
0
P
ENTER
Number buttons
Power on/Standby
F
1 or 2 Digit channel
selection
Teletext/Time display y
• MENU
• Program position st
Menu
Stereo/Dual
VCR (VTR)/DVD
functions to operate
your Toshiba VCR or
DVD.
CALL
Teletext
• Programme position st
• Teletext st
• Input source selection
(EXT1/EXT2/EXT3/EXT4)
• RGB on/off (with F button)
• Menu <>
• Volume – +
EXIT
Sound mute
Super woofer on/off
Volume + –
fturns on or off
Rstops a tape or disk
Splays a tape or disk
R R pauses playback
)fast forwords a video tape
) R skips to the next chapter
(rewinds a video tape
R (skips to the previous chapter Note: Nbutton does not function for thisTV.
Picture Controls

– 17 –
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
PROGRAMMING CHANNEL MEMORY
Auto tuning
Before using Auto tune it is important that you se-
lect your desired system i.e. B/G for Continental
Europe, D/K for Eastern Europe, I for the U. K., L1
(12) and L2 (8) for France.
Should you also wish to tune to alternative systems
this must be done manually, after using Auto tune.
1Press the MENU button and press the > (or <) but-
ton to select the SET UP menu.
2Pressthe>buttonto
select theAUTOTUNING dis-
play.
Press the (or ) button to highlight START.
3Press the (or ) button to
highlight AUTO TUN-
ING.
Pressthe >(or <) buttonto select the required SYS-
TEM. i.e.B/G, D/K, I, L1 (12) and L2 (8).
4Press the >button to start the automatic search.
DONOTPRESS ANYBUTTONSWHILSTTHE AU-
TOMATICSEARCHISIN PROGRESS.Ifyou make
a mistake simply repeat steps 3 and 4 to start again
from the beginning.
Each station will be displayed along with a station
identifier, if available.
Allow the television to complete the search.
To tune any stations on different systems, choose
the system you want, then use Manual tune for all
the extra stations you require.
Manual tuning
1Press the MENU button and press the >(or <) but-
ton to select the SET UP menu.
2Press the (or ) button to
highlight MANUAL
TUNING.
Press the > button to select the MANUALTUNING
menu and ENTER button.
3Press the >(or <) button to select SEARCH.
Press the button to search up the band (>>>) or
the button to search down the band (<<<).
The SEARCH will flash and the TV will show the
channel numbers whilst the TV is searching.
When a station/satellite is found it will be displayed.
4Press the >(or <) button to
select the PRO-
GRAMME NO.
Press the (or ) button to select the program po-
sition number required.
Press the ENTER button if you wish to store the
broadcast displayed (ENTER:TO STORE will high-
light momentarily) or repeat from step 3 if you wish
to continue searching.
The display will stay on screen for approx. 60
seconds. If you do not STORE the program po-
sition it will not be held in memory.
Repeat the procedure for all the remaining program
positions you wish to tune, including the satellite.
Press the EXIT button to exit when you have fin-
ished.

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GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
THIS PAGE IS
INTENTIONALLY LEFT
BLANK.

CIRCUIT BLOCK DIAGRAM
– 19 – – 20 –
MICON TMP88CS38N

MECHANICAL DISASSEMBLY
– 21 – – 22 –
SCREW
3pcs
SCREW
SCREW
SCREWS
SCREW
A271
"ENGINE PART"
Front
4pcs
SCREW 2pcs
(K901)
QK01
K903
UB01
A364
B205
A401
B207
A402 (B205)
KK20
Holder
3pcs
SCREW 11pcs
Rear
A282
KK52
KK53
A201
A202
A263
A262A266
(A271) A264
A271
K901
SCREW 4pcs
Shild
SCREW 2pcs