Philips L7.3A Service Manual
1
ServiceManual
Published by LV 9864 TV Service Department Printed in The Netherlands Subject to modification 5 4822 727 21566
©
Copyright reserved 1998 Philips Consumer Electronics B.V. Eindhoven, The
Netherlands. All rights reserved. No part of this publication may be reproduced,
stored ina retrievalsystem ortransmitted, in any form orby anymeans, electronic, mechanical, photocopying, or otherwise withoutthe prior permision of Philips.
Colour Television Chassis
L7.3A
AA
CL 86532010_001.ai
160298
Content
1 Technical specifications 2
2 Connection facilities, location of panels 3
3 Safety instructions, Warnings 4
and Notes
4 Mechanical instructions 6
5 Repair facilities 7
Software adjustments and Hotel mode 12
6 Block diagram, 13
Survey of testpoints 14
Diagram supply voltages survey
7 Electrical Diagrams and print lay-outs
Diagram PWB
Main PWB layout 16
Power supply diagram A1 17 16
Main PWB layout 18
Line drive diagram A2 19 18
Sync-frame & vertical drive diagram A3 20 18
Video Processing diagram A4 21 18
Control diagram A5 22 18
Sound processing diagram A6 23 18
Sound amplifier diagram A7 24 18
BTSC decoding diagram A8 25 18
CRT PWB/ Audio sound PWB 26
CRT module diagram B 27 26
Nicam sound panel diagram C 28 26
8 Electrical adjustments 29
9 Circuit Descriptions new circuits 31
10 Directions for use (limited) 38
11 List of abbreviations 46
12 Spareparts list 47
Published by LV 9864 TV Service DepartmentPrinted in The NetherlandsCopyright reserved 1998 Philips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwisewithout the prior permision of Philips.Subject to modification5 4822 727 21566
1 Technical specifications
2 L7.3A
1 Technical specifications
Mains Voltage: : 150 - 276 Volt
: 90 - 276 Volt
Mains frequency : 50 Hz
: 60 Hz
Power Consumption in stand-by : < 10 Watt
Power Consumption normal mode : 25” : 75Watt +/- 10%
: 29” : 90 Watt +/- 10%
Chassis mains isolated : Yes
Aerial input impedance TV : 75 Ohm - coax
Picture tube range : 25” and 29”
EHT voltage for 25” : 27 KVolt
EHT voltage for 29” : 30 KVolt
Max EHT power : Linitted at 33 Watt
Sound output power : 2 X 3 Watt
: 2 X 5 Watt
Picture S/N at 70uVolts : > 46 dB unweighted
: > 53 dB weigted
2 Connection facilities
3L7.3A
2 Connection facilities
2.1 Cinch
- Video 1Vpp/75Ω q
- Audio L(0.5Vrms ≥10kΩ) q
- Audio R(0.5Vrms ≥10kΩ) q
2.2 Head phone
- (8 - 600Ω / 4mW) ot
2.3 Location of panels
VIDEO 2
IN
ANTENNA
IN
VIDEO 1
IN OUT
VIDEO
AUDIO
R
L
AUDIO
VIDEO
R
L
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Red
IR
ChannelVolume
++--
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A1
C
A2
NICAM PANEL
POWER SUPPLY
LINE DRIVE
SYNC / FRAME
VERTICAL DRIVE
VIDEO PROCESSING
(BIMOS IC)
CONTROL
A3
SOUND AMPLIFIER
BTSC DECODING
SOUND PROC.
+ SOUND INTERFACE
A4
A5
A6
A7
A8
CRT PANEL
B
MAIN
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3 Safety instructions, Maintenance instruction,
4 L7.3A
3 Safety instructions, Maintenance instruction, Warnings and Notes
3.1 Safety instructions for repairs
Figure 3-1
1. Safety regulations require that during a repair:
– the set should be connected to the mains via an
isolating transformer;
– safety components, indicated by the symbol (see fig.
3.1), should be replaced by components identical to
the original ones;
– when replacing the CRT, safety goggles must be worn.
2. Safety regulations require that after a repair the set must
be returned in its original condition. In particular attention
should be paid to the following points.
– As a strict precaution, we advise you to resolder the
solder joints through which the horizontal deflection
current is flowing, in particular:
• all pins of the line output transformer (LOT);
• fly-back capacitor(s);
• S-correction capacitor(s);
• line output transistor;
• pins of the connector with wires to the deflection
coil;
• other components through which the deflection
current flows.
Note: This resoldering is advised to prevent bad
connections due to metal fatigue in solder joints and is
therefore only necessary for television sets older than
2 years. The wire trees and EHT cable should be
routed correctly and fixed with the mounted cable
clamps.
– The insulation of the mains lead should be checked for
external damage.
– The mains lead strain relief should be checked for its
function in order to avoid touching the CRT, hot
components or heat sinks.
– The electrical DC resistance between the mains plug
and the secondary side should be checked (only for
sets which have a mains isolated power supply). This
check can be done as follows:
• unplugthemainscord and connect a wire between
the two pins of the mains plug;
• set the mains switch to the on position (keep the
mains cord unplugged!);
• measure the resistance value between the pins of
the mains plug and the metal shielding of the tuner
or the aerial connection on the set. The reading
should be between 4.5 MW and 12 MW;
• switch off the TV and remove the wire between the
two pins of the mains plug.
– The cabinet should be checked for defects to avoid
touching of any inner parts by the customer.
3.2 Maintenance instruction
It is recommended to have a maintenance inspection carried
out by a qualified service employee. The interval depends on
the usage conditions:
– When the set is used under normal circumstances, for
example in a living room, the recommended interval is 3 to
5 years.
– When the set is used in circumstances with higher dust,
grease or moisture levels, for example in a kitchen, the
recommended interval is 1 year.
– The maintenance inspection contains the following actions:
• Execute the above mentioned 'general repair
instruction'.
• Clean the power supply and deflection circuitry on the
chassis.
• Cleanthe picture tube panel and the neck of the picture
tube.
3.3 Warnings
1. ESD
All ICs and many other semiconductors are susceptible to
electrostatic discharges (ESD). Careless handling during
repair can reduce life drastically. When repairing, make
sure that you are connected with the same potential as the
mass of the set by a wristband with resistance. Keep
components and tools also at this same potential.
– Available ESD protection equipment:
– anti-static table mat (large 1200x650x1.25mm) 4822
466 10953
– anti-static table mat (small 600x650x1.25mm) 4822
466 10958
– anti-static wristband 4822 395 10223
– connection box (3 press stud connections, 1 M ohm)
4822 320 11307
– extension cable (2 m, 2 M ohm; to connect wristband
to connection box) 4822 320 11305
– connecting cable (3 m, 2 M ohm; to connect table mat
to connection box) 4822 320 11306
– earth cable (1 M ohm; to connect any productto mat or
connection box) 4822 320 11308
– complete kit ESD3 (combining all 6 prior products -
small table mat) 4822 310 10671
– wristband tester 4822 344 13999
2. In order to prevent damage to ICs and transistors, all highvoltage flashovers must be avoided. In order to prevent
damage to the picture tube, the method shown in Fig. 3.2
should be used to discharge the picture tube. Use a highvoltageprobe and a multimeter (position DC-V). Discharge
until the meter reading is 0V (after approx. 30s).
3. Togetherwith the deflection unit and any multipole unit, the
flat square picture tubes used from an integrated unit. The
deflection and the multipole units are set optimally at the
factory.Adjustmentofthisunitduringrepairis thereforenot
recommended.
4. Be careful during measurements in the high-voltage
section and on the picture tube.
5. Never replace modules or other components while the unit
is switched on.
6. When making settings, use plastic rather than metal tools.
This will prevent any short circuits and the danger of a
circuit becoming unstable.
7. Wearsafety goggles during replacement of the picturetube
3.4 Notes
1. The direct voltages and oscillograms should be measured
with regard to the tuner earth , or hot earth as this is called
(see fig. 3.3)
2. The direct voltages and oscillograms shown in the
diagrams are indicative and should be measured in the
Service Default Mode (see chapter 8) with a colour bar
signal and stereo sound (L:3 kHz, R:1 kHz unless stated
otherwise) and picture carrier at 475.25 MHz.
3 Safety instructions, Maintenance instruction,
5L7.3A
3. Wherenecessary, the oscillograms and direct voltages are
measured with and without aerial signal. Voltages in the
power supply section are measured both for normal
operation and in standby . These values are indicated by
means of the appropriate symbols (see fig. 3.3).
4. The picture tube PWB has printed spark gaps. Each spark
gap is connected between an electrode of the picture tube
and the Aquadag coating.
5. The semiconductors indicated in the circuit diagram and in
the parts lists are completely interchangeable per position
with the semiconductors in the unit, irrespective of the type
indication on these semiconductors.
Figure 3-2
Figure 3-3
V
CL 26532098/042
140792
tuner earth
tuner aarde
la masse du tuner
Tuner-Erde
massa del tuner
tierra del sintonizador
with aerial signal
met antenne signaal
avec signal d'antenne
mit Antennensignal
con segnale d'antenna
con la señal de antena
normal condition
normaal bedrijf
fonctionnement normal
normaler Betrieb
funzionamento normale
funcionamiento normal
hot earth
hete aarde
la terre directe
heißen Erde
massa calda
tierra caliente
without aerial signal
zonder antenne signaal
sans signal d'antenne
.ohne Antennensignal
senza segnale d'antenna
sin la señal de antena
stand by
stand by
position de veille
in Bereitschaft
modo di attesa
posición de espera
4 Mechanical instructions
6 L7.3A
4 Mechanical instructions
For the service position of the main carrier see figure 4.1:
The main carrier can be removed by releasing the 2 carrier
blocking lips (1) and pulling the carrier panel backwards.
Figure 4-1
A
2
1
11
B
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5 Faultfinding tree & Repair facilities
7L7.3A
5 Faultfinding tree & Repair facilities
SWITCH - ON TV SET
NO PICTURE
NO SOUND
LED
CONTINUOUSLY
ON
LED
BLINKING
NOT ERROR
CODE
LED
REACTION
ON RC
SET
IN HICK-UP
MODE
SET
SHUTDOWN
CHECK +5V, +8V
SUPPLY CONTROL
VOLTAGE
AT PIN 1
IC 7520
PULSES
AT PIN 3
IC 7520
REPLACE IC 7520
NO
NO
NO
NO
NO
YES
NO
NO PICTURE ON SCREEN
Check
3489,3490
3493,6488
6489,7401
7460,7480
7518
Check
3449,5445
6449,6450
6560,7401
7460,7518
7541
Check
2489,3486
3487,3491
3492,5445
6486,6490
7401,7460
7518
Check
2405,2440
3401,6401
6490,7401
Set in standby or
Proteceion mode
Check : Standby CCT
+/-11V(LOT), +8V(IC7541),
VFB,HFB,XRAY,EHT_INFO
YOKE COIL : M4 & M5
Check: 140v,
1572,3575,3585,5573, 6560,
7570,7581,
YES
YES
Peak voltage
at pin 6 ic 7520
>2.5v
Check :
take over CCT
3528,3529,5540
6540
Check :
feedback loop
7581, 3577
Check :
6445, 7445
7518
Check :
1500,2507,2508
2517,2529,3510
3518,3519,3521
3525,3529,3530
5545,6514,6540
7518,7520
NO
YES
YES
YES
Over voltage
protection
YES
Voltage
at pin 14 IC7520
<2.5V
Check : sensing
primary CCT
3514,3521
Check :
+8V supply
FM/CVBS
NO SOUND
Voltage
+8V,+13V, +14V
OK
NO
Check :
5300,3330,3340,7312,7311
Check :
3506,3510,3529
3530,6510
Check :
3525, 3518,7518
YES
YES
CHECK : CRT VOLTAGE
2841, 3840, 3841, 7930
Picture
DIST
Picture
Shift
Picture
Bottom
1/2 Gone
Picture
In Blue
&
Flyback
Line
Check
3449,5445
6449,6450
6560,7401
7460,7518
7541
Picture
Offset
66%
Pin
Cushion
Check :
2457,2466
2470,2472
2475,3454
3457,3458
3472,3474
5451,5457
5465,5470
5471,6460
6461,6470
6472,7460
7470,7518
PICTURE DARK
CHECK
CHECK : TUNER SUPPLY
: LOT OUTPUT +5V
2484,2488,3489,3490,
3493,6488,6489,7480
RASTER W/O SIGNAL
PIN6 & PIN7 +5 VOLT
2002,5003,
NO
NO
YES
NO
FOR ITT PANEL ONLY
CHECK : +5V,+8v SUPPLY
3247,5203,5204,5205
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5 Faultfinding tree & Repair facilities
8 L7.3A
5.1 Repair facilities
5.2 Functional blocks
The PCB has service printing on both sides , so on the copper
and the component side. Functional blocks are indicated by
lines and text.
Test points are referring to the functional blocks as mentioned
above :
– Test pointElectrical function
– P1, P2, etc. :Power supply
– L1, L2, etc. :Line drive and line output
– F1, F2, etc. :Frame drive and frame output
– S1, S2, etc. :Synchronization
– V1, V2, etc.: Video
– A1, A2, etc.: Audio
– C1, C2, etc.:Control
– B1, B2, etc : BTSC stereo decoding
– N1, N2, etc.:NICAM stereo decoding
The numbering is done in for a diagnostics logical sequence.
Example: Checking the power supply, start with test point P1,
P2 etc.
5.3 Service mode
Theservice modeisa pre-defined mode which can be used for
faultfinding and adjustments (especially when the TV gives no
picture at all you can use the service default mode). All
oscillograms and DC voltages in this service manual are
measured in the service default mode.
The service mode is split into two parts :
• Service Default Mode (SDM).
• Service Alignment Mode (SAM).
SDM. In the service default mode you are able to carry out
(hardware) measurements under pre-defined conditions. To
entry the (SDM) Service Default Mode there are two
possibilities:
• Via the "DEFAULT" button on the Dealer Service Tool,
service codenumber : 4822 218 21232.
• ViaShort-circuiting theservicepins M24 and M25 on PCB
and switchingon the set via the mainsswitch. For M25 and
M24 see Diagram A4 and the PWB drawing of the main
panel
In the SDM mode a "S" (in green) and the menu (in red) is
displayed (see Fig. 1).
SAM. In the SAM mode you are able to align/adjust settings via
menu selection. To entry the (SAM) Service Alignment Mode
there are two possibilities :
• Via the "ALIGN" button on the Dealer Service Tool
• ViaShort-circuiting servicepinsM28 and M29 on PCBand
switching on the set via the mains switch. For M25 and
M24 see Diagram A4 and the PWB drawing of the main
panel
In the SAM mode a "S" (in green) and the menu (in red) is
displayed (see Fig. 2).
REMARKS: After the set isin the service mode the short circuit
can be removed.
To leave the Service mode press the stand-by button on the
remote control.
REMARKS : After switching off and on the mains switch, the
set remains in the service mode (SDM- or SAM mode).
Features are :
• Service settings after entry
• Service (sub) menu selection
• Error buffer display
• Software version and identification display
• Life timer (run timer) display
• Option bytes
5.4 Initial states
The initial state after switching on in service mode for System
and Tuning are as follows :
• For Multi-System sets PAL BG/SECAM/DK/NTSC
• For Bi-Norma and Tri-Norma sets NTSC/PAL-M/PAL-N
• For sets with VST tuning : Programme number 1 is
selectedandthesystemwill be tuned at the tuning data (for
programme 1) read from EEPROM
• For sets with PLL tuning : Set is tuned to a frequency of
475.25 MHz.
Further settings :
• The automatic switch off (no IDENT) timer and the sleep
timer will be ignored
• The child lock will be disabled.
• If theTVsets was in hotel mode, this mode will be disabled
as long as the TV is in service mode.
• Brightness, saturation, sharpness, contrast and balance
are initialised to 50% level.
• The volume is set to 25% level.
• The TV is normally controllable.
• All displayed text strings in service mode, so SDM and
SAM mode will be displayed in the English language.
Other features
RAM test of the uP (=IC7600) and the NV RAM (=IC7620). At
every start-up of the TV, a read after write test for the complete
RAM of IC7600 and via I2C the NVRAM (=IC7620) will be
performed. If this check fails, the appropriate error number will
be written in the error buffer. The patterns will be chosen in
such a way that every bit of all bytes, will be written high and
low. If the NVRAM is empty default values will be loaded.
5.5 SDM (Service Default Mode)
This menu is being displayed whenever SDM is entered. In this
menu the error buffer can be inspected, and the option byte(s)
can be (re)programmed. The overview of the menu is shown
below :
The MENU UP/DOWN command can be used to select the
next/ previous option ; the MENU LEFT/RIGHT command can
be used to change the option value.
S (Service mode)
L73AP21 1.0
(Software version)
9999 (Life timer)
5 Faultfinding tree & Repair facilities
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Explanation :
L73AP21 1.0: The software identification, version and cluster.
AS: A two character short name for the option to be selected.
(see table )
VALUE: The value of the selected option.
ERR: Error buffer display
3 4 3 0 0
S: The character " S " indicates that the TV set is in the service
mode.
9999: The hexadecimal value of the life timer.
8888 7777 66: 10 digits of value representation of the option
byte contents
5.5.1 Software identification
Ifthere is a change of the softwarethis number will be changed.
5.5.2 Life timer (run timer)
This life timer only counts the normal operations hours and not
the stand-by hours. Also at every switch- on the life timer is
incremented by 1.
5.5.3 Option code
The possible options are listed in the following table 1:
Error buffer
Thelast five errors, stored in the NVRAM=EEPROM(IC7620),
are shown in the service main menu; this is called the
errorbuffer. An error will be added to the buffer if this error
differs from the last error in the buffer. The last found error is
displayed on the left-side.
Example: Suppose the display shows: 3 4 0 0 0. This means
the last found error is error number 3, the last found error but
one is error number 4, and so on.
– 40000
– 34000
REMARKS: If the (IC7620=) EEPROM is replaced by a new
one the set has to be installed according to the option code.
The ERROR BUFFER will be erased when the set is switched
from service mode in stand by, or via DST code 99.
Error codes
The following error codes have been defined :
– 0 - No error
– 1 - Internal RAM
– 2 - General 12C error
– 3 - EEPROM Configuration error (Checksum error)
– 4 - I2C error (MSP3410 / TDA9850/TDA9860)
– 5 - I2C error (TDA8374)
– 6 - EEPROM error (ST24C04)
– 7 - I2C error (PLL tuner)
5.5.4 Error code indication via blinking stand by LED
The ERROR code are also indication via blinking of the
standby LED. This is important if no OSD function or picture is
available. The method is to show that the LED blinks as many
as the error code indicates..
Example: Error code 4 will result in four blinks of theLED ( 0.25
seconds ON and 0.25 seconds OFF).After this sequence the
LED will be OFF for 3 seconds and the blinking of the LED is
repeated again.
5.5.5 Option abbreviation and Option status.
To select another option abbreviation use the MENU UP/
DOWN buttons and to change the status use the MENU LEFT/
RIGHT buttons.
Elucidation: With above items the option statuses stored in the
EEPROM can be changed. This is necessary if the EEPROM
is replaced by a fresh EEPROM, because a fresh EEPROM is
initial loaded with default options by the uC. The options stored
in the factory can differ per type and stroke number. Therefore
it is necessary to load the EEPROM with the correct options
(configuration). These options are indicated on a sticker glued
inside on the rear cover of the set.
Remark: For sets with BTSC sound, also the options
TUN.FOA, TUN.FOB, EXT.FOA and EXT.FOB have to be set.
See for these items Paragraph 6
Loading a fresh EEPROM
• Switch on the TV via the power switch.
• Audio mute the TV (to get no big noise).
• Change the option codes as indicated on the sticker on the
rear cover.
• Put TV in stand by via the remote control.
• Switch on the TV again via the remote control.
• Switch OFF the TV via the power switch
• Switch on the TV again via the power switch.
In the table all the possible option abbreviation with full option
name and possible status are listed.
Table 1 : Options description for L7.3 versions.
AS (options
description)
VALUE 8888 7777 66
(options bytes)
ERR (error buffer) 3 4 3 0 0 (error
code)
Full option name Option name
abbreviation
Status Possibilities
Auto cable detect AC ON/OFF
AFC Status AF ON/OFF
Auto scan AS ON/OFF
AVL AV ON/OFF
Balance BL ON/OFF
Bilingual Mono BM ON/OFF
Bass Treble BT ON/OFF
Child Lock CH ON/OFF
Clock CK ON/OFF
Contrast plus CP ON/OFF
EW control EW ON/OFF
5 Faultfinding tree & Repair facilities
10 L7.3A
OPTION code
OPT is the abbreviation of OPTION, this abbreviation refers to
the following 12 digit hexadecimal option codes (BFDD FBEF
2C). The option code can not be selected. It only give an quick
indication in hexadecimal form of the options settings of the
relevant set.
5.6 SAM (Service Alignment Mode)
This menu is being displayed whenever SAM is entered.
In SAM you are able to make tuning adjustments, Alignment of
white tone, adjustment of picture geometry, Sound alignment
,VSD and AKB enable/disable (black current loop).
The overview of the menu is shown below :
General: The following items of the sub menus can be selected
with the UP(+)/DOWN(-) arrow keys on the user remote
control.
Entry into the sub menus is executed with the VOL(+) / VOL(-)
arrow keys.
SAM MAINS MENU
5.6.1 AKB
With the option AKB the "black current loop" can be enabled
or disabled. ON =enabled, OFF = disabled.
5.6.2 TUNER
With the items TUN.FAO and TUN.FOB the speed ( time
constant) for internal signals is set. The speed can be set to
normal,slowor fast. The tuner sub menu contains the following
information :
For monitoring during alignment of AGC,YD,CL, IF-PLL, AFW.
All entered data will be send directly to the video one chip;
values are stored in EEPROM if this sub menu is left.
4 : 3 Expend EX ON/OFF
Games GM ON/OFF
Hospital mode HS ON/OFF
Monitor No Ident NI ON/OFF
NTSC Play Back NP ON/OFF
Spatial SA ON/OFF
Sound Board SB MA = Mono All
MM=Multi Mono
ND = ITT Nicam
MSP3410D
NB = ITT NICAM
MSP3410B
IT = ITT 2CS
MSP3400
50 = TDA 9850
60 = TDA 9860
52 = BTSC
TDA9852
55 = BTSC
TDA9855
Smart Picture Term
Control
SC ON/OFF
Smart Sound SS ON/OFF
Bimos Standby ST ON/OFF
Surf SU ON/OFF
Multi System SY AF = AP FULL
MULTI
SS = SINGLE
SYSTEM
AD = AP DUAL
AM = AP MULTI
2N = Binorma
3N= Trinorma
4N = Fournorma
Tuner TN ON/OFF
Volume Limiter VL ON/OFF
Video Mute VM ON/OFF
Remote Control W1 ON/OFF
External 1 XT ON/OFF
External 2 2X ON/OFF
TDA884X Family 88 ON/OFF
S
AKB 0
VSD 0
TUNER >
WHITE TONE >
GEOMETRY >
AUDIO >
S
TUNER
AGC 37
YD 1
CL 0
IF-PLL 61
AFW 80
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5.6.3 White tone
The white tone menu contains the following information :
MAIN WHITE TONE MENU
NORMAL TEMPERATURE SUB MENU
REMARK :
Only one of the 3 items (RED, GREEN or BLUE) will be display
on the screen. Via "scrolling" with the UP/DOWN keys the
items can be changed.
• NORMAL: Via this menu the NORMAL colour
temperature alignment can be set.
• DELTA COOL : Via this menu the cool colour temperature
alignment can be set
• DELTA WARM : Via this menu the normal warm
temperature alignment can be set
Changing any of the items red, green or blue can be changed
by first pressing the control left/right keys to highlight the
desired setting. With the desired setting highlighted, the user
can either increment or decrement the setting by using control
up/down key respectively. All changed data will be stored into
the EEPROM after returning to the service main menu via the
OK key.
The initial default value for all setting is 37.
The factory settings of the colour temperatures are :
DELTA COOL TEMPERATURE SUB MENU
• DELTA COOL RED 0
• DELTA COOL GREEN 1
• DELTA COOL BLUE 3
DELTA WARM TEMPERATURE SUB MENU
• DELTA WARM RED 0
• DELTA WARM GREEN 254
• DELTA WARM BLUE 249
5.6.4 GEOMETRY
The geometry menu contains the following information :
Intothepicture geometry menu, the first item will be highlighted
and displayed. The value can be incremented or decremented
by pressing the control right or left key. The rest of the
parameters can be scrolled through by using the control up/
down keys.
AFA 1
AFB 1
S
NORMAL RED 37
DELTA COOL RED 0
DELTA WARM RED 0
S
RED 37
GREEN 37
BLUE 39
NORMAL 10500K R = 37 G = 37 B = 39
DELTA
WARM
8200K R = 0 G = 254 B = 249
DELTA
COOL
14000K R = 0 G = 1 B = 3
HSH Horizontal shift
VSL Vertical slope
VAM Vertical amplitude
VSH Vertical shift
VX Vertical Zoom
VSC Vertical Scroll
EW E-W amplitude
PW E-W parabola/width
CP E-W cornerparabola
TC E-W trapezium
SC S-Correction
SBL Service blanking
H60 Delta HSH for 60 Hz
V60 Delta VAM for 60 Hz
S
HSH 32
VSL 32
VAM 32
VSH 34
VX 13
VSC 39
EW 54
PW 46
CP 39
TC 41
SC 52
SBL 0
H60 10
V60 10
5 Faultfinding tree & Repair facilities
12 L7.3A
All changed data will be stored into the EEPROM after
returning to the service main menu via the OK key
5.6.5 AUDIO
The sound adjustments sub menu contains the following
information :
The TDA9852 sub menu isonly available if the BTSC sound IC
is present. The settings can be changed by first highlighted the
respective item using the control up/down keys and then
increment or decrement the value by using the control right or
left keys. The default value shown in the diagram are the
normal values. For service purposes the normal values can be
used
NOTE: The value should not change unless it is absolutely
necessary !!!!
5.7 Dealer remote used as a Dealer Service Tool (DST)
With the DST, under mentioned extra service features can be
executed.
The main features are :
• Direct entering SDM via the "DEFAULT" button on the
DST.
• Direct entering SAM via the "ALIGN" button on the DST.
• Read the error buffer even if the OSD is not working at all.
This is done via the blinking LED procedure
REMARKS:
• Entry of the SDM and SAM via the DST is possible in all
states, except from stand-by.
• All software is suspended till the dealer remote mode is
left.
• The servicemode status is left if : the stand-by command
is received.
5.8 Downloading of tuning data with the DST
Downloading of tuning data (programme number, frequency
and system) via the DST is made possible. This downloading
is ONLY possible in the version containing PLL tuning for
Europe.
5.9 Blinking LED procedure
Via the DIAGNOSE 1 (for errorbuffer position 1) through the
DIAGNOSE 5 (for error 5) commands of the DST, the error
buffer can be made visible via the blinking LED. This is useful
if the screen is not working properly. The method is to use the
LED pulses with as many pulses as the error number, followed
by a time period of 3 seconds in which the LED is off. E.g. error
code 4 will result in four times the sequence LED on for 0.25
seconds / LED will be offfor 0.25 seconds. After this sequence
the LED will be off for 3 seconds.
5.10 Hotel-mode
TheL7.3chassis has one special mode, called the hotel mode.
In the hotel mode the following occurs:
• Installation menu cannot be entered.
• When entering the hotel mode the maximum volume will
be the current value.
• The set will always switch to a selectable channel when
set is switched on.
Entering the hotel-mode :
• Select channel 38
• Push the menu button on the local keyboard ( vol. + and
vol. - ) and the OSD-button of the RC simultaneously for 3
seconds; then you are in the hotel mode.
Leaving the hotel mode :
• Same as entering the hotel mode.
The OSD will display the hotel mode "on" or "off".
HOTEL MODE SUB MENU " ON "
HOTEL MODE SUB MENU " OFF "
S
AUDIO
AUTO >
ST-NT 7
SAP-NT 7
LA 7
WIDEB 31
SPECT 31
38 HOTEL ON
HOTEL CHANNEL 38
BLANK FROM 6
TO 6
38 HOTEL OFF
6 Block diagram
13L7.3A
6 Block diagram
B
CRT MODULE
V15c
V16c
V
FOCUS
V
G
2
R
EHT
G
B
FF
V15b V16b
V15a
V16a
14
2
5
1
3
8
9
7
2
FF
C60
3840
+200VA
BC INFO
G
R
B
C 7
5
2
1
3
4
3
7225 - 5A
TDA8374C
345
RF-AGC
92
7225 - E
TDA8374C
UV 1336
1015
2016
6015
6016
5260
1275
B
AND SWITCH
BS 1
A 4
VIDEO PROCESSING
(BIMOS 1C)
1206
1207
BS 2
I 4 I 7
I 5
I 3
7
11
1
6
28
SCL
SDA
ONLY FST
V -
TUNE
34
48
49
54
I F (A4 - 33)
1208
5.5MHz
6MHz
6.5MHz
PAL/NTSC
DECODER
Y
SY
7215
7214
CVBS -SOUND
CVBS - EXT2
CVBS -EXT1
CVBS -OUT
1275
DOS
Blank
7225 - C
TDA8374C
7255
TDA4665
16
V 11
32
31
14
21
22
19
G
R
B
M 7
5
2
1
3
4
6
6
R G B
I2C
20
EHT INFO
BC INFO
SCL
SDA
27
8
7
39
2524232618
29
30
33
38 35 34 36
10
11
13
17
SAND
-
CASTLE
-(R-Y)
-(B-Y)
64uS
64uS
7204
CVBS
A4 - 14
7217
1209
7216
7542
3548
2541
6542 6543
3543
3544
+8V
2542
-TXT
CVBS
-
OUT
-1
V 15
V 14V 13
V 12
VIDEO
DET
˜
˜
˜
˜
ONLY VST
(A4 - 15)
(A4 - 32)
(A4 - 16)
(A5 - 27)
(A5 - 28)
(A5 - 1)
3216
3217
3211
+8Vb
+8Vb
V1
ONLY PAL/MULTI
CHROM_O / NTSC - SW
(A6 - 36)
(A6- 32)
(A4 - 32)
(A6- 30)
(A6 - 31)
( Y )
(R - Y) _ OUT
(B - Y) _ OUT
(A5 - 13)
(A3 - 33)
(A5 - 15)
(A4 - 16)
(A5 - 16)
(A4 - 15)
(A5 - 5)
(A5 - 25)
(A5 - 24)
(A5 - 23)
(A5 - 22)
(A3 - 37)
(A2 - 37)
CVBS
-INT
+8Va
3208
I 1
V 10
V 9
CVBS_INT A4 -29
A5 - 14
5545
5
4
3
2
5
4
12
16
10
+13V
+8V
6560
18
14
13
A1
14
3
2
DC
AC
2508
SK 1
1500
5500
6502/05
T 5 AH
MAINS SUPPLY
6540
2540
3577
2561
STANDBY
220V˜
5574
3585
3575
V BATT
ADJUST
140V
9V
3
2
7
3518
8
1
3528
7520
OSC B
UFFER
4
7520
MC44603AP
P1
P3
P4
P11
P9
P8
!
!!!
!
3525
7541
TDA8139
9
8
2
4
+5V
3
RESET
(A5 - 19)
(A5 - 26)
6550
2551
P10
140V VBATT
6590
6570
2571
+10V / 14V
CRT
DISCHARGE
(A4 - 38)
7518
STH8NA60F
7470
5551
+140V VBATT
2563
2562
P12
40
52
51
7225 - 5D
TDA8373/74
46
A 3
SYNC - FRAME & VERTICAL DRIVE
42
43
EHT
HEATER
SANDCASTLE
SYNC
G
16kHz
G
50
HZ
41
47
50
37
44
45
-
+
Op.Amp
H DRIVE TO A3 - 42
EW DRIVE TO A2 - 43
VERT.
DEFECTION
2
1
+11V LOT
6401 2403
2403
3407
3409
9401
6402
VFB A5 - 20
+48V LOT
(ONLY FOR 29")
2404
-11V LOT
3441
3440
5
7
1
263
4
3439
3437
(A2 - 41)
X-RAY PROT
(A4 -33)
(A5 -21)
3430
7420
3422
642164203423
EHT
INFO
+8V+8V
3421
3420
+8V
M 4
7401
TDA9302H
VERTICAL
SYNC
F 3
F 1
S 1
L 3
F 4
F 4
!
!
F 2
1
2
3
4
5
6
7
8
9
10
11
12
13
17
18
19
20
21 32
33
34
35
36
42
41
40
39
38
37
36
35
34
33
32
31
29
37
7601
7600 (TXT)
CONTROL
VOLUME
BASS
STANDBY
LED
VFL
31
30
28
30
29
28
27
52
51
50
49
48
47
46
45
44
43
42
41
39
40
38
15
14
16
22
23
24
25
26
27
NC
BL_TXT_OSD
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
17
18
19
20
21
25
26
22
V-TUNE
MONO/STOBE/BG-L
BG
/L-or-BG/
DK
BLACK
-
STR-SW
SID
/
STA/LL
INT
/
EXT
STAND-BY
TREBLE
CVBS
TXT
-
(A4-1)
(A6-3)
(A7-2)
(A6-4)
(A4-5)
(A6-6/A7-6)
(A6-7/A7-7)
(A6-8)
(A7-9)
(A7-10)
L
OCAL
KEYBOARD
BS 2
BS 1(A4 - 27)
(A4 - 28)
(A4 - 13)
(A6 - 8)
A5
+5 VD
SDA
SCL
EEPROM
+5 VD
REMOTE
RECEIVER
CHROMA-O/NTSC-SW
CHROMA-2 / STATUS
RESET
X - TAL
12M
HZ
B_TXT_OSD
G
_
TXT_OSD
R
_
TXT_OSD
FLYBACK
(A6 - 15)
(A7 - 15)
(A4 - 15)
(A6 - 16)
(A7 - 16)
(A8 - 16)
(A4 - 16)
(A4 - 14)
(A1 - 19)
(A3 - 20)
+5V
(A2-21/A3-21)
(A4 - 22)
(A4 - 23)
(A4 - 24)
(A4 - 25)
(A1 - 26)
M29
M28
SERVICE
SAM
MODE
(A8 - 15)
M 25
M 24
SERVICE
SDM
MODE
RC5
(A4 - 18)
7620
(A6-11)
AV - MUTE
CHROMA-1 / BG/L (A4 - 17)
C1
C3
C6
C5
C2
V2
V 3
P15
P13
P14
0V6 STB
5445
6486
6488
2486
2484
5480
40
1
3
10
9
FOCUS
G2
EHT INFO
+11V LOT
+5V LOT
HEATER
X-RAY
PROTECTION
29" ONLY
-11V LOT
+48V LOT
+11V LOT
HFB( A5 - 21)
7225 - D
HOR
DRIVE
E/W
DRIVE
TDA8374C/
N337
45
A 2
LINE DRIVE
7460
BU1508DX
2457
5470
247134713470
+11V LOT
(FROM A3 - 43)
5457
EW DRIVE
EW CONNECTION
6466
6465
5463
7461
G
16kHz
3430
+8V
HOR.
DEFECTION
7
8
6
2469
3448 3449
6485 3485
5
11
12
64806481
+200 TO
CRT PANEL
6490
2489
6449
6450
6463
3466
6464
6467
3467
L 1
L 4
L 8
L 10
6487 5487 3488
PROTECTION
(A5 - 12)
L 11
L 7
L 9
+140V
VBATT
!
!
8.6532010_006.eps
110398
PROTECTION
E/W
1102
1104
FM
AUDIO
DET
1
15
M 9
1
2
3
4
5
6
7
M 11
1
2
3
6
7
8
9
10
11
13
14
16
17
A 6
2
7114
4
5
˜
˜
˜
LEFT OUT
RIGHT OUT
SDA
SCL
+8V
CVBS sound
MOD_R_IN2
MOD_L_IN2
BG-L
STANDBY_AV1
MOD_L_IN1
MOD_L_IN1
7113
7115
7118
7117
MUTE
MUTE
A5-15
A5-16
A6-36
A6-40
A7-40
A6-5
A6-1
A6-2
INT_EXT
SID_STA_LL
AMP_L
AMP_R
A5-3
A5-8
A6-60
A6-70
M16
A1
A3
L_EXT1
A7-44
MONO OUT
A8-44
A7-49
A4
A5
A6
CINCH
CONNECTIONS
LEFT OUT
RIGHT OUT
VIDEO OUT
VIDEO-IN1
LEFT-IN1
RIGHT-IN1
VIDEO-IN2
LEFT-IN2
RIGHT-IN2
CINCH
CONNECTIONS
CVBS-SOUND A8-36
BG/L-D-BG/DK A5-4
A7-70
A7-60
A7-5
A2
A5-7
A5-6
A7-47
A7-48
A4-32
A4-31
A6-70
A4-30
A6-60
A6-5
A6-40
CVBS_EXT1
MOD_L_IN1
MOD_R_IN1
CVBS_EXT2
MOD_L_IN2
MOD_R_IN2
6
5
4
2
3
7
8
9
7
3
5
4
6
2
1
HEADPHONE/SPEAKER SWITCH
3143
3142
A10
A8
A7-54
R-
R
A7-53
A7-52
2116
2115
4107
4100
A9
A7
56
2108
BTSC DECODING IC
A 8
+11V LOT
A5-15
A5-16
SCL
SDA
7317
10 8 9
27
21
OUT-L
OUT-R
A7-45
A7-46
3372
6303
6304
16 17
11
2381
7316
MONO OUT
A6-44
I
N
P
U
T
I
2
C
TONE
CONTROL
A 7
7310
26 7
L
R
A6-5
A6-40
A6-60
A8-45
A6-70
A8-46
MOD_L_IN2
MOD_R_IN2
MOD_L_IN1
MOD_R_IN1
OUT_L
OUT_R
A5-16
SCL
A5-15
SDA
16 17 24 9 ?? 23
+8V
6
18
15
3
5
1
7
7311
IN1
IN2
DCV1
DCV2
OUT1
OUT2
OUT2
OUT2
+14V
4
13
11
10
8
RIPPLE
FILTER
(ALC)
16
+8V
2353
7314
A5-8
STANDBY-AVL
L OUT
A6-1
R OUT
A6-2
A6-52
A6-51
A6-53
A6-54
+13V
7312
2
L1
L
R7
R1
A16
A15
A17
A18
A13
A14
A21
A19
A11
A12
A23
A22
A24
A25
2128
L (L+R)
A7-51
BTSC DECODING
+ 8D
I2C
L+
L-
R+
R-
*
CRT DISCHARGE CIRCUIT
*
1
HFB
EHT-INFO
3438
+8V
3479
(A2-2)
BLACK-STR-SW
B-TXT_OSD
G-TXT_OSD
R-TXT_OSD
BL-TXT_OSD
1
2
SOUND PROCESSING
55
3349
B2
B3
B1
SOUND AMPLIFIER
12
11
G- Y
MATRIX
+200V
9
8
3574
1
2422
2404
6470
L 3
+140V
VBATT
+200VA
1234
M60
6403
5573
6 Block diagram
14L7.3A
7542
3548
2541
6542 6543
3543
3544
+8V
2542
5545
5
4
3
2
5
4
12
16
10
+13V
+8V
6560
18
14
13
A1
14
3
2
DC
AC
2508
SK 1
1500
5500
6502/05
T 5 AH
MAINS SUPPLY
6540
2540
3577
2561
STANDBY
220V˜
5574
3585
3575
V BATT
ADJUST
140V
9V
3
2
7
3518
8
1
3528
7520
OSC B
UFFER
4
7520
MC44603AP
P1
P3
P4
P11
P9
P8
!
!!!
!
3525
7541
TDA8139
9
8
2
4
+5V
3
RESET
(A5 - 19)
(A5 - 26)
6550
2551
P10
140V VBATT
6590
6570
2571
+10V / 14V
CRT
DISCHARGE
(A4 - 38)
7518
STH8NA60F
5551
+140V VBATT
2563
2562
P12
P15
P13
P14
0V6 STB
*
CRT DISCHARGE CIRCUIT
*
1
1
2
9
8
3574
1
8.6532010_008.eps
090398
A2
LINE DRIVE
Vbatt
A3
SYNC-FRAME
& VERT. DRIVE
+8V
A4
VIDEO
PROCESSING
CRT DISCHARGING
A5
CONTROL
A6
SOUND
PROCESSING
+8V
A7
SOUND
AMPLIFIER
+13V
C
NICAM PANEL
+5VD
RESET
STAND-BY
Vbatt
5201
5203
+8V
+8V
+8VB
+8VA
+5V
+8V
5300
+8VD
+14V
+8V 5203
5205
5204
+8VA
+5VA
+5VB
5573
7470
5445
6486
6488
2486
2484
5480
40
1
3
10
9
FOCUS
G2
EHT INFO
+11V LOT
+5V LOT
HEATER
X-RAY
PROTECTION
29" ONLY
-11V LOT
+48V LOT
+11V LOT
HFB( A5 - 21)
7225 - D
HOR
DRIVE
E/W
DRIVE
TDA8374C/
N337
45
A 2
LINE DRIVE
7460
BU1508DX
2457
5470
247134713470
+11V LOT
(FROM A3 - 43)
5457
EW DRIVE
EW CONNECTION
6466
6465
5463
7461
G
16kHz
3430
+8V
HOR.
DEFECTION
7
8
6
2469
3448
3449
6485 3485
5
11
12
64806481
+200 TO
CRT PANEL
6490
2489
6449
6450
6463
3466
6464
6467
3467
L 1
L 4
L 8
L 10
6487 5487 3488
PROTECTION
(A5 - 12)
L 11
L 7
L 9
+140V
VBATT
+140V
VBATT
!
!
PROTECTION
E/W
3479
(A2-2)
6470
L 3
8.6532010_007.eps
090398
B
A4
CRT PANEL
VIDEO
PROCESSING
A5
CONTROL
A2
LINE DRIVE
A3
SYNC-FRAME
& VERT. DRIVE
A8
BTSC
DECODING
+200V
ANODE CRT
FOCUS
VG2
HEATER
+5V_LOT
+5V_LOT
HFB
PROT.
+11V_LOT
+11V_LOT
+ 48V (29")
-11V_LOT
+11V_LOT
X-RAY PROT.
+11V_LOT
5003
EHT
+VB
A4
0.5V / div AC
0.1ms / div
A5
0.5V / div AC
0.2ms / div
A6
5V / div DC
10ms / div
A
A7
50mV / div AC
0.2ms / div
A8
50mV / div AC
0.2ms / div
A9
50mV / div AC
0.1ms / div
A19
50mV / div AC
0.2ms / div
A21
50mV / div AC
0.1ms / div
A18 1.2V DC
A18 0V DC
A20 14.8V DC
C2
1V / div DC
0.1ms / div
C3
1V / div DC
0.1ms / div
C4
1V/ div DC
5ms / div
A
A
A
C1 5.0V DC
F1
0.5mV / div DC
5ms / div
F2
0.5mV / div DC
5ms / div
F3
10V / div DC
5ms / div
F4
10V / div DC
5ms / div
I1
500mV / div AC
10µs / div
I3 1.6V DC
I3 4.0V DC
I4 5.0V DC
I5 0.5 - 30V DC
I7
50mV / div AC
500ms / div
L8 5.0V DC
L10 194V DC
L9 -11.7V DC
L2
2V / div DC
20µs / div
100V / div DC
20µs / div
L1
L3
200mV / div DC
10µs / div
L6
5V / div DC
5ms / div
P2
5V / div DC
5ms / div
P1 270V DC
P1 270V DC
N2 4.2V DC
N1 4.1V DC
N3 0.2ms AC
P11 14V DC
P11 14V DC
P13 10V8 DC
P13 10V2 DC
P14 8V1 DC
P14 0V6 DC
P15 5V DC
P15 5V DC
P3
0.2V / div DC
5µs / div
P3
0.1V / div DC
5µs / div
P4
2V / div DC
5µs / div
P4
2V / div DC
5µs / div
P6
1V / div DC
5µs / div
P6
1V / div DC
10µs / div
P5 13V DC
P5 11.5V DC
5V / div DC
5ms / div
P2
P9 2V DC
P10 120V DC
P10 120V DC
S1
2V / div DC
20µs / div
V13
500mV / div AC
10µs / div
V12
200mV / div AC
10µs / div
V1
500mV / div DC
10µs / div
V2
1V / div DC
10µs / div
V3
500mV / div DC
10µs / div
V4
500mV / div DC
10µs / div
V11
200mV / div AC
10µs / div
V14
500mV / div AC
10µs / div
V15
500mV / div AC
10µs / div
V15a
500mV / div AC
10µs / div
V15b
500mV / div AC
10µs / div
V15c
500mV / div AC
10µs / div
V16a
20V / div DC
10µs / div
V16b
20V / div DC
10µs / div
V16c
20V / div DC
10µs / div
CL 86532018_010.AI
020498
C5 3V tt 12 MHz
C6 5V tt 12 MHz
6 Block diagram
15L7.3A
3355
2622
2388
1681
7600
7601
2621
5601
3671
31433142
2116
M16
1500
5500
5545
1
3515
6510
7520
7541
7310
7315
7311
7255
7225
2508
3473
3480
9405
9510
9326
9237
9319
9323
3427
2484
2485
4126
2460
5520
2104
2105
1
2008
M9 M11
2487
3476
2465
2115
SK
LOT
TUNER
CL 86532018_001.AI
010498
A13
A8
A14
A10
P1
C3
P3
P15
C1
C2
B3
P5
P7
A25
A19
A20
A12
A17
P8
P4
P14
P13
P12
B2
C6
C4
P2
6590
A16
B1
A15
A6
P9
S1
L11
A3
V4
P10
P11
6402
6110
F4
L5
P6
C5
A5
L3
L4
F2
A5
A4
F3
L9
L10
L8
I5
I7
A1
L7
V3
I1
V12
I3
F1
V9
V10
A2
A22
A23
L6
A21
A18
V2
A24
L1
2486
2489
3409
4
7
6
3
1
10
14
2
6
8
9
4
5
8
3
1
10
11
13
23
10
7
24
A11
26
16
14
12
11
V11
28 29
V1
A3
15
13
6
1
38
55
I4
11
6
1
21
11
A4
0.5V / div AC
0.1ms / div
A5
0.5V / div AC
0.2ms / div
A6
5V / div DC
10ms / div
A
A7
50mV / div AC
0.2ms / div
A8
50mV / div AC
0.2ms / div
A9
50mV / div AC
0.1ms / div
A19
50mV / div AC
0.2ms / div
A21
50mV / div AC
0.1ms / div
A18 1.2V DC
A18 0V DC
A20 14.8V DC
C2
1V / div DC
0.1ms / div
C3
1V / div DC
0.1ms / div
C4
1V/ div DC
5ms / div
A
A
A
C1 5.0V DC
F1
0.5mV / div DC
5ms / div
F2
0.5mV / div DC
5ms / div
F3
10V / div DC
5ms / div
F4
10V / div DC
5ms / div
I1
500mV / div AC
10µs / div
I3 1.6V DC
I3 4.0V DC
I4 5.0V DC
I5 0.5 - 30V DC
I7
50mV / div AC
500ms / div
L8 5.0V DC
L10 194V DC
L9 -11.7V DC
L2
2V / div DC
20µs / div
100V / div DC
20µs / div
L1
L3
200mV / div DC
10µs / div
L6
5V / div DC
5ms / div
P2
5V / div DC
5ms / div
P1 270V DC
P1 270V DC
N2 4.2V DC
N1 4.1V DC
N3 0.2ms AC
P11 14V DC
P11 14V DC
P13 10V8 DC
P13 10V2 DC
P14 8V1 DC
P14 0V6 DC
P15 5V DC
P15 5V DC
P3
0.2V / div DC
5µs / div
P3
0.1V / div DC
5µs / div
P4
2V / div DC
5µs / div
P4
2V / div DC
5µs / div
P6
1V / div DC
5µs / div
P6
1V / div DC
10µs / div
P5 13V DC
P5 11.5V DC
5V / div DC
5ms / div
P2
P9 2V DC
P10 120V DC
P10 120V DC
S1
2V / div DC
20µs / div
V13
500mV / div AC
10µs / div
V12
200mV / div AC
10µs / div
V1
500mV / div DC
10µs / div
V2
1V / div DC
10µs / div
V3
500mV / div DC
10µs / div
V4
500mV / div DC
10µs / div
V11
200mV / div AC
10µs / div
V14
500mV / div AC
10µs / div
V15
500mV / div AC
10µs / div
V15a
500mV / div AC
10µs / div
V15b
500mV / div AC
10µs / div
V15c
500mV / div AC
10µs / div
V16a
20V / div DC
10µs / div
V16b
20V / div DC
10µs / div
V16c
20V / div DC
10µs / div
CL 86532018_010.AI
020498
C5 3V tt 12 MHz
C6 5V tt 12 MHz
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