Hitachi CL43WP910TAN, CL55WP910AN Schematic

SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety
Precautions” and “Product Safety Notices” in this service manual.

SM00026

CL43WP910TAN
CL55WP910AN

Data contained within this Service
manual is subject to alteration for
improvement.

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise
zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

Les données fournies dans le présent
manuel d’entretien peuvent faire l’objet
de modifications en vue de perfectionner
le produit.

Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

COLOUR TELEVISION

DECEMBER 1999

ENGLISH

SAFETY PRECAUTIONS

WARNING: The following precautions must be observed.

ALL PRODUCTS

Before any service is performed on the chassis an
isolation transformer should be inserted between the
power line and the product.

1. When replacing the chassis in the cabinet, ensure
all the protective devices are put back in place.

2. When service is required, observe the original
lead dressing. Extra precaution should be taken to
ensure correct lead dressing in any high voltage
circuitry area.

3. Many electrical and mechanical parts in
HITACHI products have special safety related
characteristics. These characteristics are often not
evident from visual inspection, nor can the
protection afforded by them necessarily be
obtained by using replacement components rated
for higher voltage, wattage, etc. Replacement
parts which have these special safety
characteristics are identified by marking with a

! on the schematics and the replacement parts
list.
The use of a substitute replacement component
that does not have the same safety characteristics
as the HITACHI recommended replacement one,
shown in the parts list, may create electrical
shock, fire, X-radiation, or other hazards.

4. Always replace original spacers and maintain lead
lengths. Furthermore, where a short circuit has
occurred, replace those components that indicate
evidence of overheating.

5. Insulation resistance should not be less than 2M
ohms at 500V DC between the main poles and
any accessible metal parts.

6. No flashover or breakdown should occur during
the dielectric strength test, applying 3kV AC or

4.25kV DC for two seconds between the main
poles and accessible metal parts.

7. Before returning a serviced product to the
customer, the service technician must thoroughly
test the unit to be certain that it is completely safe
to operate without danger of electrical shock. The
service technician must make sure that no
protective device built into the instrument by the
manufacturer has become defective, or
inadvertently damaged during servicing.

CE MARK

1. HITACHI products may contain the CE mark on
the rating plate indicating that the product
contains parts that have been specifically
approved to provide electromagnetic
compatibility to designated levels.

2. When replacing any part in this product, please
use only the correct part itemised in the parts list
to ensure this standard is maintained, and take
care to replace lead dressing to its original state,
as this can have a bearing on the electromagnetic
radiation/immunity.

PICTURE TUBE

1. The line output stage can develop voltages in
excess of 25kV; if the E.H.T. cap is required to be
removed, discharge the anode to chassis via a
high value resistor, prior to its removal from the
picture tube.

2. High voltage should always be kept at the rated
value of the chassis and no higher. Operating at
higher voltages may cause a failure of the picture
tube or high voltage supply, and also, under
certain circumstances could produce X-radiation
levels moderately in excess of design levels. The
high voltage must not, under any circumstances,
exceed 29kV on the chassis (except for projection
Televisions).

3. The primary source of X-radiation in the product
is the picture tube. The picture tube utilised for
the above mentioned function in this chassis is
specially constructed to limit X-radiation. For
continued X-radiation protection, replace tube
with the same type as the original HITACHI
approved type

4. Keep the picture tube away from the body while
handling. Do not install, remove, or handle the
picture tube in any manner unless shatterproof
goggles are worn. People not so equipped should
be kept away while picture tubes are handled

LASERS

If the product contains a laser avoid direct exposure to
the beam when the cover is open or when interlocks are
defeated or have failed.

2

FRANÇAIS

CONSIGNES DE SECURITE

AVERTISSEMENT: vous devez respecter les précautions suivantes

POUR TOUS LES PRODUITS

Avant d’effectuer une intervention d’entretien sur le
châssis, vous devez insérer un transformateur d’isolement
entre la ligne d’alimentation électrique et le produit.

1. Lors de la remontage du châssis dans le coffret,
vérifiez que tous les dispositifs de protection sont
remis en place.

2. Lorsqu’une intervention d’entretien s’avère
nécessaire, respectez l’agencement d’origine des
conducteurs. Vous devez prendre des précautions
supplémentaires pour garantir un agencement correct
des conducteurs dans toutes les zones où des circuits
haute tension sont présents.

3. De nombreux composants électriques et mécaniques
des appareils HITACHI ont des caractéristiques
spéciales de sécurité. Bien souvent, ces
caractéristiques ne sont pas évidentes lors d’un
examen visuel et la protection qu’ils offrent n’est pas
forcément garantie si vous utilisez des composants de
rechange conçus, par exemple, pour une tension plus
élevée, une puissance plus forte. Les pièces de
rechange qui offrent des caractéristiques spéciales de
sécurité sont identifiées par un repérage comportant

le symbole ! sur les schémas et sur la
nomenclature des pièces de rechange.
L’emploi d’un composant de rechange qui ne
respecte pas les mêmes caractéristiques de sécurité
que la pièce de rechange que recommande HITACHI
et qui figure dans la nomenclature risque de
provoquer un choc électrique, un incendie, des rayons
X ou d’autres dangers.

4. Remettez toujours en place les entretoises d’origine
et respectez la longueur des conduites. En outre, à la
suite d’un court-circuit, remplacez les composants
présentant des signes de surchauffe.

5. La résistance d’isolement doit être supérieure ou
égale à 2 méga ohms à 500 V c.c. entre les pôles
principaux et des composants métalliques
accessibles, quels qu’ils soient.

6. Aucun claquage et aucune rupture ne doit se produire
pendant l’essai de résistance diélectrique à la suite de
l’application d’une tension de 3 kV c.a. ou de 4,35
kV c.c. pendant deux secondes entre les pôles
principaux et des composants métalliques
accessibles.

7. Avant de remettre au client un produit qui a fait
l’objet d’un entretien, le technicien qui s’est chargé
de cette intervention doit tester à fond cet ensemble
pour s’assurer qu’il ne présente aucun danger
opérationnel et aucun risque de choc électrique. Ce
technicien doit s’assurer qu’aucun des dispositifs de
protection intégrés à cet instrument par le fabricant
n’est défectueux ou n’a été endommagé de façon
accidentelle lors de l’entretien.

3

LABEL CE

1. Les produits HITACHI peuvent avoir reçu le label
CE qui figure sur la plaque signalétique pour indiquer
que cet ensemble contient des composants qui ont fait
l’objet d’une homologation spécifique de respect des
normes de compatibilité électromagnétique en
fonction de niveaux bien spécifiés.

2. Lors du remplacement d’un des composants de ce
produit, utilisez uniquement le composant correct
identifié dans la nomenclature afin de maintenir le
respect de cette norme ; en outre, vous devez
également ramener l’agencement des conducteurs à
son état d’origine car cela peut avoir une influence au
niveau des rayonnements électromagnétiques et sur la
protection contre ces rayons.

PICTURE TUBE

1. L’étage de sortie des lignes peut développer des
tensions de plus de 25 kV ; s’il faut retirer le chapeau
de protection contre les tensions extrêmement
élevées, il convient de décharger l’anode contre le
châssis par le biais d’une résistance de forte valeur
avant de déposer ce chapeau du tube image.

2. La haute tension doit toujours se maintenir à la valeur
nominale du châssis et ne pas dépasser cette dernière.
Un fonctionnement à des températures élevées peut
provoquer une défaillance du tube image ou l’entrée
d’une tension élevée. Dans certains cas, cela peut
même provoquer des rayons X d’un niveau
légèrement supérieur aux valeurs de calcul. Cette
haute tension ne doit en aucun cas dépasser 29 kV sur
le châssis (à l’exception des téléviseurs de
projection).

3. La principale source de rayons X de cet appareil est
le tube image. Le tube image employé pour assurer la
fonction susmentionnée dans ce châssis est
spécialement construit pour limiter des rayons X.
Pour maintenir cette protection contre les rayons X, il
faut remplacer le tube d’origine d’un type agréé par
HITACHI par un autre tube de même type.

4. Lors des manipulations, ne tenez jamais le tube
image contre le corps. Pendant toutes les opérations
d’installation, de dépose et de manipulation de ce
tube image, quelle que soit la méthode employée,
vous devez toujours porter des lunettes de sécurité
anti-éclatements. Les personnes qui ne portent pas ce
type de lunettes doivent se tenir à l’écart du tube
image lors de la manipulation de ce dernier.

RAYONS LASER

Si ce produit contient un rayon laser, évitez toute
exposition directe à ce faisceau lors de l’ouverture du
couvercle ou lors de l’élimination des verrouillages de
sécurité ou après défaillance de ces verrouillages.

DEUTSCH

SICHERHEITSVORKEHRUNGEN

WARNUNG: Die folgenden Vorkehrungen müssen eingehalten werden.

ALLE PRODUKTE

Bevor die Grundplatte gewartet wird, sollte ein Trenntrafo
zwischen die Netzleitung und das Produkt eingebracht
werden.

1. Wenn die Grundplatte in das Gehäuse zurückgestellt
wird, stellen Sie sicher, dass alle
Schutzvorrichtungen wieder an ihrem Ort sind.

2. Wenn Wartung erforderlich ist, halten Sie die
originale Verdrahtungsart ein. Besondere Vorsicht ist
nötig, um die korrekte Verdrahtungsart in jedem
Hochspannungsstromkreis zu gewährleisten.

3. Viele elektrische und mechanische Teile von
HITACHI Produkten haben besondere
sicherheitsbezogene Eigenschaften. Diese
Eigenschaften fallen oft nicht ins Auge, aber der
durch sie gewährte Schutz kann nicht unbedingt
erreicht werden, wenn man Ersatzteile benutzt, die
für höhere Spannung, Leistung usw. ausgelegt sind.
Ersatzteile, die diese besonderen
Sicherheitsmerkmale haben, sind in den

Prinzipskizzen und Ersatzteillisten an einem ! zu
erkennen.
Der Gebrauch von Ersatzteilen, die nicht dieselben
Sicherheitsmerkmale haben wie die empfohlenen
HITACHI Ersatzteile, wie sie in der Ersatzteilliste
aufgeführt sind, kann zu elektrischem Schlag, Feuer,
Röntgenstrahlung und anderen Gefahren führen.

4. Immer die originalen Abstandsstücke ersetzen und
die Leitungslängen beibehalten. Wo ein Kurzschluss
passiert ist, die Teile ersetzen, bei denen Überhitzung
nachzuweisen ist.

5. Der Isolierwert sollte bei 500 V Gleichstrom
zwischen den Hauptpolen und allen zugänglichen
Metallteilen nicht unter 2M Ohm liegen.

6. Bei der Prüfung auf Durchschlagsfestigkeit sollte
kein Überschlag oder Durchschlag vorkommen,
wenn zwei Sekunden lang 3 kV Wechselstrom oder
4,25 kV Gleichstrom zwischen den Hauptpolen und
allen zugänglichen Metallteilen angelegt wird.

7. Bevor das gewartete Produkt dem Kunden
zurückgegeben wird, muss der Wartungstechniker
das Gerät gründlich prüfen, um sicherzustellen, dass
es betriebssicher ist ohne das Risiko eines
elektrischen Schlages. Der Wartungstechniker muss
sicherstellen, dass keine vom Hersteller im Gerät
eingebaute Schutzvorkehrung schadhaft geworden ist
oder bei der Wartung unabsichtlich beschädigt
wurde.

CE KENNZEICHEN

1. HITACHI Produkte enthalten eventuell das CE
Kennzeichen auf dem Leistungsschild, welches
angibt, dass das Produkt Teile enthält, die eigens
zugelassen sind, um bis zu einem spezifizierten
Niveau elektromagnetische Störfreiheit zu bewirken.

2. Wenn Sie irgendein Teil in diesem Produkt ersetzen,
benutzen Sie bitte nur das korrekte Teil, das in der
Ersatzteilliste aufgeführt ist, um sicherzustellen, dass
dieser Standard eingehalten wird, und geben Sie acht,
die Verdrahtungsart in ihren ursprünglichen Zustand
zurück zu versetzen, weil das einen Einfluss auf die
elektromagnetische Abstrahlung/Störsicherheit haben
kann.

BILDRÖHRE

1. Die Leitungsausgangsstufe kann Spannungen von
mehr als 25 kV entwickeln; wenn die
Höchstspannungskappe entfernt werden muss,
entladen Sie die Anode zum Gehäuse über einen
hochohmigen Widerstand, bevor Sie sie aus der
Bildröhre entfernen.

2. Hochspannung sollte immer auf den festgelegten
Wert des Gehäuses beschränkt bleiben und nicht
mehr. Betrieb bei höherer Spannung kann zum
Versagen der Bildröhre oder zu hoher
Spannungszufuhr führen und kann unter Umständen
auch Röntgenstrahlung hervorbringen, die leicht über
dem Konstruktionsniveau liegt. Die Hochspannung
darf auf keinen Fall 29 kV am Gehäuse überschreiten
(außer bei Projektionsfernsehern).

3. Die Hauptquelle der Röntgenstrahlung im Produkt ist
die Bildröhre. Die Bildröhre, die für die oben
erwähnte Funktion in diesem Gehäuse benutzt wird,
ist eine Spezialkonstruktion zur Begrenzung der
Röntgenstrahlung. Um den Schutz vor der
Röntgenstrahlung zu behalten, ersetzen Sie bitte die
Röhre durch denselben Typ wie den ursprünglichen
von HITACHI zugelassenen.

8. Halten Sie die Bildröhre bei der Handhabung vom
Körper weg. Sie dürfen die Bildröhre nur dann
installieren, entfernen oder handhaben, wenn Sie eine
nicht splitternde Schutzbrille tragen. Personen ohne
derartigen Schutz sollten ferngehalten werden,
solange Bildröhren gehandhabt werden.

LASER

Wenn das Produkt einen Laser enthält, setzen Sie sich
keinesfalls direkt dem Strahl aus, wenn die Abdeckung
geöffnet ist oder wenn die Verriegelung versagt.

4

BLOCK DIAGRAM EXPLANATION POWER SUPPLY BLOCK

Normally Power Supply switching is operated as following.

T901:43k–91kHz(Normal),100-125kHz(Stand by)

TP91:31k-59kHz(Normal)

POWER SUPPLY UTILIZED FOR THE SIGNAL AND AUDIO CIRCUITS:
(POWER SUPPLY P.W.B.)

The voltages produced are;
 +33V
 Stand By +12V also called A12V
 TV +8.3V
 TV +5V
 +36V for Audio Out circuit.
The A12V supply runs anytime the set is plugged into an AC outlet and Main Power SW is turned ON.
Other voltages supplies only operates when the set is turned ON.

POWER SUPPLY UTILIZED FOR THE DEFLECTION AND DIGITAL CONVERGENCE CIRCUITS:
(DEFLECTION SUPPLY P.W.B.)

This supply only operates when the set is turned ON.When the ON command is received relay S901 energizes
and delivers AC to the main bridge rectifier D903 located on the Power Supply P.W.B.
This supplies power primarily to the Deflection circuit for the collector of the High Voltage generation circuit and
the collector of the Deflection Output transistor.
Also,the Convergence output amps derive their voltages from here as well.
The voltages produced are;
 +130V used for Deflection and High Voltage circuits.
 +220V used for the collectors of the R,G,B drivers on the CRT P.W.B. and the Velocity Modulation circuits.
 +28V for the Convergence circuit.
 -28V for the Convergence circuit.
 +13V for Vertical and also converted down to the 5V for Deflection and Digital Convergence Unit.
 -13V for Vertical and also converted down to the –5V for the Digital Convergence Unit.
 +6.3V to drive the CRT Heaters.
The A12V from the Power Supply P.W.B. is used as a switched ON/OFF for the Deflection Vcc by the
Rainforest IC.

POWER SUPPLY UTILIZED FOR THE AUDIO CIRCUIT:
(SUB POWER SUPPLY P.W.B.)

This supply only operates when the set is turned ON.
The voltages produced are;
 +13V for Audio Out Circuit.
 -13V for Audio Out Circuit.

+130 REG.

UP91 POWER SUPPLY BLOCK DIAGRAM

VIDEO

VM OUT

CONVERGENC

VERTICAL

+220V

+28V

-28V

+13V REG.

+5V REG.

-13 SW.REG.

VT(+33V)

STBY 12V SW.REG.

+8.3V SW.REG.

+5V SW.REG.

+36V(AUDIO FRONT)

TO SIGNAL BLOCK

TO DEFLECTION

BLOCK

(POWER / DEFLECTION P.W.B.)

(POWER SUB P.W.B.)

AUDIO REAR

+13V

-13V

(SUB POWER P.W.B.)

HEATER

-5V REG.

+6.3V

DEF

DCU

SUB POWER

RELAY

FUSE

LINE

LINE

LINE

CHOKE

POWER SW

SWITCHED

24.5V

35V

SWITCHED

SWITCHED

SWITCHED

SWITCHED

STAND BY

RELAY

RELAY

RELAY

FILTER

COIL

FILTER

FILTER

SUB

SWITCHING

REGULATOR

I901

T901

SUPPLY

I9000

T9000

CENTER

WOOFER

MAIN

SWITCHING

REGULATOR

IP01

TP91

+B

CONVERGENC

VERTICAL

DCU

Audio Circuit

The output from the Tuner U101 is fed via a gain and buffer stage formed by Q209 and
Q210 to the SAW Filter X208. The saw filter has two separate characteristics depending on
which of the two inputs (on pin 1 and 2 of the SAW Filter) the signal is applied to. Selection
is achieved by the combination of Q211 and Q212. For most standards, pin 1 is selected.
However, when an L’ Signal has been selected, the micro (I001) instructs I201 via an I2C
command to take pin 19 high. When this happens Q211 conducts taking pin 1 low and
switching Q212 and D202 off. This means that the collector of Q212 goes high allowing
D201 to conduct and hence the signal to be applied to pin 2. To return to other broadcast
standards, pin 19 of I201 is obviously returned to the low condition.

The output of the SAW is applied to pins 63 and 64 of I201. Here the Signal is transformed
from the 1st IF (33.4 – 40.4 MHz depending on transmission standard) to the sound IF (5.5
to 6.5 MHz depending on the transmission standard).

I201 also provides AM demodulation for the L’ and L standards. The demodulated signal
appears superimposed on the Sound IF on pin 5 of I201.

This signal then takes two paths. The first takes it through a Low pass filter formed by R410
and C412 and coupling capacitor C411. This is then applied to pin 55 of I401 and forms the
AM sound Input. The second path takes the signal through a amplifier and buffer stage
formed by Q402 and Q401.

After these stages some high pass filtering is applied by C406 and R409 before the sound IF
is applied to pin 60 of I401.

I401 is The MSP3410D. This IC provides NICAM, FM Mono and FM Stereo demodulation
as well as matrixing of the SCART inputs.

The AV1 input is applied on pins 52 and 53, the AV2 input on pins 49 and 50, the AV3
input on pins 43 and 44, AV4 input on pins 46 and 47. In Each case a 100R resistor and 330n
capacitor is used.

The MSP3410D also has an analogue to digital conversion function. Selected analogue
signal is transferred to I2S digital signal and is sent to digital dolby decode section.

The SCART outputs on I401 use the following protocol.

SCART output Output signal

AV1 TV audio

AV2 Monitor

AV3 Monitor

The device is I2C Controlled via pins 9 and 10 and receives a reset from the micro at power
up on pin 24. The clock is provided by X401 on pins 62 and 63. The device has three supply
rails, 5V Digital (Pin 18), 5v Analogue (Pin 57), and 8v Analogue (Pin 39).

AUDIO OUTPUT

Class-D

R466

R473

R479

Class-D

Front L
R459

R468

R461

Front L

Front R

R480

R474

Head Phone

To Head

Front R
(PSA1 pin2)

The left and right signals are output from pins 1 and 2 of the PSA1 connector and are then
applied to audio amplifier I402(TDA7482) and I403(TDA7482) via the attenuation networks
R459 / R461 & R466 / R468.

The left and right output stage consists of two TDA7482 which are Class-D amplifier which
in this case is driven to give 15W per channel @ 10% thd. The power output is limited by
the Vcc supply to pin 13.

The TDA7482 has mute control line on pin 10. This control input is high when the outputs
are active and low when muted.

Headphone

The left and right signals are output from pins 1 and 2 of the PSA1 connector and are then applied
to Headphone amplifier I404(TDA2822N) via the attenuation networks R473 /R474 & R479 / R480
The TDA2822N has dual low-voltage power amplifier.

(PSA1 pin1 )

I402

Amp.
TDA7482

Amp.
TDA7482

I403

I404

Amp
TDA2822N

Speaker

Speaker

Phone

Fig.3 Sound output circuit Diagram

Auto Digital Convergence (MAGIC FOCUS) System

1M BITS

64K BITS

8 BIT BUS

10 BIT DATA

8000 GATES

ARRAY

The auto digital convergence system can readjust convergence with one touch operation.
The system is composed of 8 photo detectors, an A/D converter, and an optical pattern
generator internal GATE ARRAY compared with conventional systems.(As shown in follow Fig.)
The System can measure the dislocation of the image in each overscanned area,
where 8 photo detectors are located, with respect to another. Therefore ,it can recover
the “good” convergence state to which the TV was adjusted , before the misconvergence occurred.
This set has three mode Digital convergence data. (PAL , NTSC Progressive, PAL 100Hz Interlace)
So need to operate three times Adjustment and setting.

PUSH SWITCH

CPU

REMOTE

CONTROLLER

EEPROM

A/D

PHOTO

DETECTOR

SCREEN

fc=16MHz

ADDRESS

PLL

H

SYNC

V

COUNTER

GATE

Fig. 8 Auto Digital Convergence System.

RAM

CORRECTION

PATTERN

ADJUSTMENT POINT 13(H x9(H)POINTS

NORMAL PATTERN

GENERATOR

OPTIONAL PATTERN

GENERATOR

AVERAGECALCULATOR

DATA CONVERTER

D/A

S/H

S/H

S/H

S/H

S/H

S/H

RV

RH

GV

GH

BV

BH

RGB

VIDEO

OUTPUT

CONVERGENCE

OUTPUT

Auto Digital Convergence (MAGIC FOCUS) System

code 2,3,9 ?

Convergence Errors

Operate Initialize.

Check the error display.

Error code:1

Error code:4,5,7

Error code:10,11*

Input strong field strength

Check the wiring of
connector between sensor

No

*4

*3

*2

Yes

Convergence errors

If an error message or code appears while performing MAGIC FOCUS or INITIALIZE,
([MUTE],[LANG] while Digital convergence mode ),follow this confirmation and repair method.

1. Turn on power and input any PAL/NTSC signal.

2. Press service switch on Deflection board.

3. Press [16:9] , then [LANG] on remote control.

4. Error code will be displayed in bottom right corner of screen. If there is no error,
an “initial OK“ message will appear on screen.

5. Follow repair chart for errors.

is error

1. Darken outside light.

2. Check the sensor position No’**.
(Placement, connection and soldering)

3. Check the connector of sensor position NO**’.

4. Is pattern hitting sensor position No’**?

5. Adjustment check.(H/V size , centering)

6. Replace sensor position No’**.

7. Replace sensor PWB or DCU.

Replace DCU.

1. Check the placement of sensor.

2. Adjustment check.
(H/V size, centering)

3. Conv. amp gain check *1.

1.
signal.

2. Input standard NTSC signal.

3.

and DCU.

Note : Error code 6 and 8 are not used .

position No.

Sensor position No.(viewed from front side)

*1 Check RK42,46,50,54,58,62 resistors first.

*2 Procedure is shown below :
Press [MUTE], then [LANG]Key.

Initialization process is now in process.

Several windows will appear and error will be displayed.

*3 Example of error display:

CONNECT 1 !

No.__

OVERFLOW!

No.__

Sensor

0 21

7

6 45

3

DEFLECTION

Block Diagram of UP91 Deflection Circuit.

T

he operation of UP91 Deflection Circuit is as shown below.

From SIGNAL P.W.B.

VERTICAL HORIZONTAL

SYNC SYNC

VERTICAL

DRIVE DEFLECTION

CONTROL

I702

VERTICAL HORIZONTAL VERTICAL

OUTPUT DRIVE PARABOLA 1
I601 Q751

DY

VERTICAL COIL OUTPUT SIDE PIN

HORIZONTAL COIL Q777 I651, Q655, Q656, Q657

VERTICAL DYNAMIC FOCUS HI-VOLTAGE

PARABOLA 2 QF02, QF03, QF04 CONTROL

OUTPUT

FOCUS PACK

HORIZONTAL HORIZONTAL SIZE

HOT PULSE GENERATOR

QF05, QF06 IH02

QF09, QF07 HI-VOLTAGE HI-VOLTAGE

OUTPUT STABILITY

QH01 QH04, QH05

T752 IH01

HF01

FBT HI-VOLTAGE

CRT TH01 ADJUSTMENT

(R), (G), (B)

Fig. 4 Deflection Circuit Block Diagram

RH44

SYNC Signal Processor - uPC1885A

Vertical Deflection & Geometry Controls.
The drive circuit for the vertical and E-W deflection circuits are generated by means of a
vertical divider which gets its clock from the line oscillator. The divider is synchronised

by the incoming vertical pulse, generated by the input processor or the feature box.

The vertical drive circuit outputs vertical sawtooth wave whose amplitude is set by
internal VCA circuit and on which S and C shaped correction wave are superimposed.
Center voltage of vertical sawtooth wave is changed by vertical position DAC. The
outputs must be DC coupled to the vertical output stage. The vertical geometry can be

a

djusted by I2C control via the service menu.

Horizontal Synchronisation & Drive Circuit.
The horizontal drive signal is obtained from an internal VCO which is running at a
frequency of 500KHz. The internal VCO is synchronised to the incoming H.SYNC pulse
by means of a PLL with an internal time constant. The horizontal drive signal generated
by means of a control loop which compares the phase of the reference signal from the

ternal VCO with the flyblack pulse. The time constant loop is internal.

in

Vertical Amplifier – LA7841L

The LA7841L is vertical deflection output amplifier.
Pin 5, vertical sawtooth wave is taken with DC from pin 8 of uPC1885A.
Pin 2 outputs the vertical output voltage, and pin 7 outputs the vertical blanking pulse.

lock Diagram of LA7841 is as shown below.

B

PROTECTION

+

1 2 3 4 5 6 7

THERMAL PUMP UP

-

AMP

Fig. 5 Block Diagram of LA7841L

Dynamic Focus

The operation of the Dynamic Focus circuit is as shown below.

Vcp

1200Vp-p

2H

C.PULSE DF07 DF08

RF35 CF18 RF15 RF21

RF14 RF22 RF25
CF11
V.PARABOLA

RF13 DF15

QF09

QF05 QF07

+12V

RF08 CF12

CF05 RF16 RF23
RF12 CF06 RF24

CF09

QF03

H. PARABOLA QF04 RF19

RF17 CF10

RF26

DF

RF10 RF11 CF08 RF18 4 1

CPT SCREEN CPT FOCUS

A

B

1V or 2V A:1000 - 1300Vp

B: 450 - 650Vp FOCUS PACK HF01

R G B R G B

Fig. 6 Dynamic Focus Circuit

The Vertical Parabola (QF09) and Horizontal Parabola (QF07) are sent to the FOCUS

PACK and Applied to the DC Focus voltage that is adjusted by the Focus Control.
These voltages are then applied to the RED, GREEN and BLUE Focus Electrodes of the
Picture Tubes in the form of a Dynamic Voltage.

H.Linearity

The H.Linearity Circuit uses two linearity coils (L752:G,B common and L753:R).

he circuit is as shown below.

T

+

­+

G H.DY

-

+

-

C765 C766

L

R759 R760

752 L753

B H.DY

R H.DY

C

TO S CURVE COLLECTOR PULSE

CORRECTION

APACITOR (C762, C763)

Fig. 7 H.Linearity Circuit

MicroController Section on the UP91 Chassis

The main m icr ocontr oller on the UP91 chas s is is loc ated at I001 (ST92R195B). This is an 80-pin QFP (quad-flat package)
that is surface m ounted for compactness. This highly com plex device controls many of the other integrated circuits via
dedicated input/output lines or the I
menus and the teletext. The device c an acquire, decode and display the teletext without the need for a separate IC. This
microcontroller is ROM-less which results in the need of a separate memor y device to store the program code nec essary
for operating the television. This m emory device is located at I002 and is multi-time program m able (MT P). T his allows the
device to be re-programmed and in the future can even be re-programmed in the board without having to remove the back
cabinet of the T V. The television s tores all the necessary customer preferences and oper ating settings in an on-board
EEPROM (E2). This device can hold 2Kb of information for storing the programme information (frequency, name, AV
setting, etc.), factory alignment settings (geometry, white balance, tuner AFC/AGC, etc.), service diagnostic errors and
customer contro l settings ( volume, br ightness, contras t, etc.). T his device com m unic ates with the m ain m ic rocontr oller via

2

the I

C bus, even in the standby mode.

Main MicroController (I001)

The ST92R195B is an enhanced microc ontroller based on the ST 9+ instruc tion set fr om ST Microelectr onics. It is c apable

2

C bus. This device also generates the RG B signals for the on-screen display (OSD)

of displaying menus and teletext for 50Hz and 100Hz televisions. This device can acquire/decode and display pages of
teletext information in FLO F (FastText) and TOP (only in Germany/Switzerland/Austria) modes. The device operates f rom
a single 4MHz crystal and a +5V supply. Dedicated address/data lines enable it to acc ess 4Mbytes of addres s space, even
though in this television it is accessing 256Kbytes (2Mbit). These address/data lines are connected to the EPROM/MTP
device which holds the instructions necessary for controlling the television.

External Memory Interface MMU Address Lines

Pins 1 (MMU0), 15 (MMU1) and 16 (MMU2) are used to access addresses above 64Kbytes. Normally pins 15 and 16 are
not used when using a 256Kbyte EPROM/MTP device (AT49F002T) in position I002.
Pin 2 (MMU3) is used to select between either the EPROM/MTP in position I002, or a future device that can be fitted in
position I003. When this line is low, the AT49F002T device in position I002 is enabled (chip enable).
Pin 17 (MMU4) is used as an output port to derive a clock signal needed for shifting the data into the 74HC595 shift
register (I006).
Pin 18 (MMU5) is not used.

External Memory Interface Control Lines

Pin 4 is the Data strobe line which is connected to the output enable input of the EPROM/MT P (I002). W hen data is read
from the EPROM/MTP, this line is temporarily low.
Pin 8 is the Read/Write line for I003. Normally, this line is not used (HIGH) but if an SRAM were to be fitted into this
position, the line could be low when writing data to the SRAM.

External Memory Interface Address Lines

Pins 3, 5, 6, 7, 13, 14 and 71 to 80 are the address lines needed to specify which location in a 256Kbyte page is needed to

be accessed from the EPROM/MTP (I002). These lines are also connec ted to I003 if an SRAM is to be f itted in future.
Normally these lines will be changing state (0V to approx. +5V). By placing an oscilloscope on pin 12 of the EPROM/MTP
(I002) it can be confirm ed that the microcontroller is operating successf ully. In this case, this line s hould be c hanging state
very frequently.

External Memory Interface Data Lines

Pins 63 to 70 are the 8 data lines needed for receiving data from the EPROM/MT P (I002) . If an SRAM were to be fitted in
position I003, then these lines would be used to transfer data from the microcontroller to the SRAM. Under normal
circumstances these lines change from LOW (0V) to HIGH (approx. +5V).

Ground Connections

Pin 9 (GNDM) is the ground connection (0V) f or the external memory interface. This should be free of noise to enable
successful communications between the microcontroller and the EPROM/MTP (or SRAM).
Pin 35 (GND) is the digital ground connection (0V) for normal operation of the device.
Pin 62 (GNDA) is the analogue ground connection for the DAC and phase lock loops (PLL’s).

Supply Connections

Pin 10 (VDDM) is the +5V supply for the external memory interface. Without this supply, the microcontroller cannot
communicate with the EPROM/MTP (or SRAM).
Pin 34 (VDD) is the main digital supply voltage to the IC (5V 10% tolerance).
Pin 52 (VDDA) is the analogue supply voltage for the DAC’s and PLL’s (+5V). These connections ar e all jo ined together to
the +5V standby rail of the television, ensuring that the microcontroller operates even in the standby state.

Crystal Oscillator Connections

Pin 11 is the 4MHz crystal oscillator input (OSCIN).
Pin 12 is the 4MHz crystal oscillator output (OSCOUT). By connecting a x100 scope probe to pin 11, it can be seen if a
4MHz sine wave is present at the oscillator input to the microcontroller.

Reset Connection

Pin 54 is the active low RESET input of the microcontroller. This input is normally high (approx. +5V) under operating
conditions, but changes state when the standby +5V power supply is typically below +4.5V. In this circum stance, the r eset
IC (I011) pulls pin 54 low until the input of it is above +4.5V. The diode (D005) ensures that the capacitor (C024)
discharges quickly when the standby supply falls, so that the reset operates quickly. The capacitor (C024) charges up
slowly when the standby +5V supply is restored, ensuring that there is some hysteresis.

Infra-red (IR) Receiver Input

Pin 25 is the IR receiver’s filtered output. This input from the IR receiver consists of PW M pulses between 0V and +5V
which are decoded by the microcontroller into useful commands from the handset. W hen a valid command has been
decoded, the Red LED on the front of the TV will briefly flash.

Horizontal and Vertical Synchronisation Connections

Pin 48 is the vertical synchronisation input from the deflection stage. This input is used to ensure that the OSD is displayed
in a stable vertical position. When the TV is in the standby state, this input is normally low. The vertical input is triggered on
the rising edge (positive polarity).
Pin 49 is the horizontal synchronisation input from the deflection stage. This input ensures that the OSD is displayed in
stable horizontal position. When the TV is in the s tandby state, this input is norm ally low. This input is rising edge triggere d
(positive polarity).

General Input Connections
Headphone Input

Pin 19 is used to detect if the headphone has been inserted into its s ocket. T his input is norm ally HIGH (+5V) unless the
headphone has been inserted, in which case it is near 0V. When the headphone is inserted, the headphone mode option
is then available in the "Sound Mode" Menu and the loudspeakers (and internal sub- woofer if available) in the television
are muted.

Front Panel Buttons and SAV4 Socket Inputs

Pins 36 and 38 are 2 of the 4 ADC inputs of the microcontroller.
Pin 36 is connected to the Volum e +/- buttons and the SAV4 (Hi-8) socket on the f ront panel of the TV. When the voltage
on this pin is changed to a value in a certain window, the microcontroller will interpret it as either a volume +, volume -,
volume +/- command and/or an SVHS Hi-8 connector was inserted into the Hi-8 socket.
Pin 38 is connected to the Programm e +/- and Menu buttons on the front panel of the T V. When the voltage on this pin is
changed to a value in a certain window, the microcontroller will interpret it as either a program me change or the menu
button was pressed.

General Output Connections

74HC595 Shift Register Outputs
Storage-Register Clock Output (RCLK)

Pin 20 of the microcontro ller is c onnected to the rising edge ( positive trigger ed) input (pin 12) of I006. T his line is norm all y
low when not communicating with the device or when shifting data into it. Once the f ull 8-bits have been shifted in, the
RCLK line rises in order to latch the data to the device’s outputs.

Shift-Register Clock Output (SCLK)

Pin 17 of the microcontroller (MMU4) is us ed to transf er the data into to the 8-stage shift- register on the ris ing edge of the
SCLK. 8 clock pulses are needed to transfer 8 bits of data into the shift register.

Shift-Register Data Output (SI)

Pin 21 of the microcontroller is used as the data line input to pin 14 of the shift regist er. When this line is HIGH, and the
SCLK changes from low to high, the fir s t bit of data (logical 1) is s hifted into the r egist er. When this input is low, the first bit
of data is ‘0’, on the rising edge of the SCLK.

EEPROM Write Enable Output

Pin 22 is the E2 write enable output line, which is connected to pin 7 of the EEPROM (E2). When this output is HIGH
(approx. +5V), the E2 cannot be written to (write disable) but data from the device can be read. W hen this output is low
(0V), then data can be written to the E2. This hardware line helps to protec t the E2 from inadvertent write operations,
which could occur under abnormal circumstances.

On/Off Output

Pin 28 is the On/Off line which turns On (LOW) /Off (HIGH) the secondary supplies (+B, +37V audio rail, +8V and +5V).
The standby +12V rails are unaffected when this output is HIGH (TV in the standby state). Under normal operating
conditions, this output will be low when the TV is NOT in the standby condition.

I2C Disable Output

Pin 33 is the I2C disable output which prevents the main chassis I2C bus from being connected to the I2C bus of the
microcontroller (I001) and E2 (I002). This line is normally HIGH when the TV is in the standby state. This output is
inverted using the 74HC04 hex inverter IC (I004) and in connec ted to pins 5 and 6 of I007. In the standby condition, pins 5
and 6 of I007 (74HC4066) are low and the M.SDA and M.SCL (microcontroller) lines are disconnected f rom the SDA and
SCL (main chassis) I
writing of the data has occurred (e.g. to log fault diagnostics when the TV fails to power-up and the main chassis I
low).

2

C lines. When writing to the E2, the I2C disable output is also pulled high, to ensure that succes sful

2

C bus is

Scart Disable Output

Pin 39 is used to disable the RS232 transmit and r eceive lines from pins 10 (Rx) and 12(T x) of scart socket 2. T his is
necessary when the TV is functioning normally. However, when the TV is in s ervice or diagnose modes, then this output
will be low to enable connection of the RS232 lines of the microcontroller to the scart socket.

Mute Output

Pin 40 is the mute output for the sound signal,(e.g. TV and Monitor out). This output is HIGH when the sound signals are
in the mute condition (e.g. program up / down).

Red LED Output

Pin 42 is the red LED output, which is used to indicate the standby state and when an IR command has been successf ully
received and decoded. When the T V is in the standby state, this output will be HIGH to ensure that the red LED is br ightly
lit. When the T V is not in standby, then this output will be low, but the red LED will remain dim ly lit through resistor R081.
When an IR command has been successfully received, then the LED will flash brief ly, to inform the user that the button on
the handset was pressed correctly.

I2C Connections

Pin 23 is the I2C bus data input/output for transferring data between other I2C peripherals/devices. This line is only
connected to the EEPROM (I005) when in the standby state or when writing to the EEPROM. This line is constantly active

when the TV is powered up and normally changes state between (+5V and 0V).
Pin 24 is the I
from the main chassis when in the standby state or when writing to the EEPROM. This line oscillates at a frequency

2

C bus clock output for cloc king the data to other I2C peripherals/devices. The c lock line is also isconnec ted

around 90KHz

RS232 Connections

Pin 30 is the RS232 Transmit line from the microcontroller. When the Scart disable output from the microcontroller (pin 39)
is low, then the TXD can be routed from pin 1 to pin 2 of I007 (74HC4066). There is never a situation whereby both disable
outputs are low.
Pin 37 is the RS232 Receive line for the microcontroller. When the Scar t disable line is low, then the data can be routed
from pin 10 of sc art 2 to pin 10 of I007 and then through to pin 37 of the m icrocontroller. There is never a situation when
both RS232 enable lines are HIGH (disable outputs LOW).

RGB Connections

Pin 44 is the OSD/Teletext RGB blanking signal necessary for allowing insertion of the OSD/Teletext onto the picture.
When this output is high (approx. +5v), then the RGB signal will be superimposed onto the current picture.
Pin 45 is the OSD blue signal necessary for displaying BLUE colours for the OSD and Teletext.
Pin 46 is the OSD green signal necessary for displaying GREEN colours for the OSD and Teletext.
Pin 47 is the OSD red signal necessary for displaying RED colours for the OSD and Teletext.

CVBS Connections

Pin 60 is the Composite Video signal input for VPS and WSS slicing. It is norm ally AC coupled and internally clamped to
ensure reliable operation. VPS (video programming system) is necessary when auto-sorting programmes in
Germany/Austria/Switzerland. WSS (wide-screen signalling) is used to indicate the aspect ratio of the incoming signal.
The TV can then use this information to display the picture in the correct format.
Pin 61 is the Composite Video signal input for Teletext acquisition and dec oding and also for sync extraction, necessary
for obtaining the correct line timings for slicing the teletext information and VPS/WSS information.

Y2-Y3-SW Output

Pin 26 is the Y2-Y3-SW relay S3(Low) or S2(High) control.

V-MUTE1 Output

Pin 29 is the V-MUTE1 output relay MUTE(High) or Active(Low) control.

Digicon-busy Input

Pin 31 is the Digicon-busy input from the Digital-Conv-Unit.
This input is used to detect if the MAGIC-FOCUS has been moved.

CUT-OFF Output

Pin 32 is used the CUT-OFF relay enable(High) or disable(Low) control.

This output is high output is high when a PTV is indicated to Horizontal center axis.

HBLK-PH Output

Pin 41 is used to adjust the phase of the horizontal blanking .

EPROM/MTP (I002)

The device located in position I002 is used to store the program code needed by the microcontroller to operate the
television correctly. This 32 pin device is an MTP (multi-time programmable memory) which allows for it to be
re-programm ed out of the c hass is without having to erase it using conventional UV EPROM eras ers. T he devic e cur rently
used on the UP91 chassis is the AT49F002T, which can hold 256Kbytes of information (2Mbit) . T his devic e als o holds any
initialisation data to be downloaded to an EEPROM. When a blank EEPROM is fitted, the initialisation data is automatically
downloaded to it when power is applied to the chassis.

Supply/Ground Connections

Pins 32 and 16 are the +5V supply and ground connections respectively. The supply voltage of +5V is always present even
when the TV is in the standby state.

Address Connections

Pins 2 to 12, 23 and 25 to 29 are the 17 address lines needed to access the f ull 256Kbytes of 8-bit data inside the device.
These lines are connected direc tly with the microcontroller so that it can request data from the MTP when operating. An
oscilloscope can be used to check pin 12 of the MTP to check whether the microcontroller is running correctly and
accessing the MTP. This pin should be oscillating at a frequency of around 2MHz and is a non-periodic square waveform.

Data Connections

Pins 13 to 15 and 17 to 21 are the 8 data lines needed to transmit a byte at a time to the m icrocontroller. These outputs
are normally tri-state and are high-impedance when the output enable pin 24 of the MTP is HIGH. When the output enable
pin is low, the data from the required address will be output on these pins.

Output Enable Connection

Pin 24 is the output enable active low input used to control the logical state of the data lines. W hen this pin is HIGH, the
data lines are in the high impedance condition and no data is present on these pins. W hen the output enable input it LO W,
the data lines are active and output the addressed data, This line is connected to the data strobe output of the
microcontroller to ensure correct operation/timings.

Chip Enable Connection

Pin 22 is the chip enable active low input used to select the device. Normally, this input is low to enable the device.
However, the device can be placed in a standby state when accessing a future SRAM in position I003. The MMU3 line
from the microcontr oller is used to select either the SRAM or the MTP. W hen no SRAM is fitted, the chip enable pin is
always low.

Miscellaneous

Pin 1 (VPP) is the programming voltage input pin (+12.75V needed) used to re-program the device when placed in a
special programmer. This pin is always tied to the +5V standby supply, to ensure that the device can never be
re-programmed inside the television chassis.
Pin 30 is not used in this device. However, it is s till connec ted to the MMU1 line f r om the microcontroller for use with larger
size MTP’s/EPROM’s. This line can be used to access a further 256Kbytes if such a device was fitted.
Pin 31 is the active-low programming enable pin that is used to re-program and erase the device. This pin is always
connected to the +5V standby supply to ensure that no inadvertent writes/erases are performed on the device.

SRAM (I003)

On future chassis, the position I003 will be used to hold an SRAM for teletext page storage and memory storage. A
128Kbyte device will most likely be situated here to allow 100 teletext pages to be acquired and s tored f or im m ediate fas t
access to them. The SRAM is connected to the microcontroller’s address and data lines, which are shared with the
EPROM/MTP in position I002.

Supply/Ground Connections

Pins 32 and 16 are the +5V supply and ground connections respectively. This device always has +5V connected to it, even
when the TV is in the standby state.

Address Line Connections

Pins 2 to 12, 23, 31 and 25 to 28 are the address lines needed to access the 128Kbyte of data by the microcontroller.

Data Line Connections

Pins 13 to 15 and 17 to 21 are the 8-bit data lines needed to receive/transmit a byte of data at a time to/from the
microcontroller.

Chip Enable Connections

Pins 22 and 30 are 2 chip enable inputs that need to be LOW and HIGH r es pectively for the 128Kbyte device to operate. If
either pin 22 is HIGH or pin 30 is LOW, then the device enters a standby state whereby its power consumption is
dramatically reduced (10uW). The MMU3 output pin from the m icrocontr oller (pin 2) is used to s elect the SRAM when it is
HIGH. If this pin is low, then the MTP/EPROM in position I002 is selected instead.

Write Enable Connections

Pin 29 is the active-low write enable input used to enable data to be stored inside the device. This pin is connected to the
read/write line of the microcontroller for synchronisation purposes.

74HC04 Hex Inverter (I004)

The 14-pin IC in position I004 is a high speed CMOS hex inver ter used to inver t digital signals. The pack age c onsists of 6
inverters, but only 4 are used in this application.

Supply/Ground Connections

Pins 14 and 7 are the +5V and 0V supply connections respectively. This device always has +5V supplied to it, even when
the TV is in the standby state. Capacitor C042 is connected across the supply terminal for de-coupling.

Chip Enable Connection

Pin 1 is connected to the MMU3 output from the microcontroller and is used to select either the MTP or the SRAM. This
signal is inverted and output from pin 2 that is then connec ted to the active low chip enable input ( pin 22) of the SRAM. In
this way, only one chip enable line from the microcontroller needs to be used to enable the SRAM.

I2C Disable Connection

Pin 5 is the I2C disable input from pin 33 of the microcontroller. This signal is inverted and output at pin 6 to pins 5 & 6 of
the analogue switch (I007). W hen the micr ocontroller is in the reset c ondition, or when the TV is in the standby state, the

2

I

C disable line is HIGH. This signal m ust be inverted to disable the m icrocontr oller ’s I2C bus from the I2C bus of the rest

of the chassis.

Scart Disable Connection

Pin 13 is the RS232 Scart Disable input f rom pin 39 of the microcontroller. This input is inverted and output at pin 12,
which is then connected to pins 12 & 13 of the analogue switch (I007). W hen the m icrocontroller is in the reset state, or
when the TV is NOT in service/diagnose modes, the RS232 transmit/receive lines MUST be disconnected from pins 10
and 12 of scart socket 2. This line must then be inverted to prevent any connection being made.

EEPROM (I005)

The M24C32 EEPROM, or E2 as it is com monly known, is a 32Kbit (4Kbyte) device that holds non-volatile data when
power is removed from the TV. This device can hold information for 100 programmes, such as the name, frequency,
standard, AV setting, speaker language setting and teletext favorite pages. The EEPROM also holds diagnostic fault codes
used to help identify previous faults with the chassis (see separate section that deals explicitly with this). The E2 also holds
factory aligned parameters, such as the geometry, white balance, tuner AFC/AGC, model type, cathode level, etc. The E2
also holds the user’s preferential settings, such as the volume, balance, contrast, br ightness, etc. Data is written to/ read
from the device using the standard Philips I

2

C protocols.

Supply/Ground Connections

Pins 8 and 4 are the +5V supply and ground (0V) connections respectively. The EEPROM is powered from the +5V
standby rail so that it always has power to it, even when the TV is in standby.

I2C Connections

Pin 5 is the I2C Data line needed to transfer serial data between the microcontroller and itself. Data is changed when the
clock line is low and latched on the rising edge of the I
Pin 6 is the I
acknowledge bit. The I

2

C clock line needed to synchronise the I2C data transfer. 9 clock pulses are needed for the 8-bit data and an

2

C master clock originates from the microcontroller and operates at a frequency around 100KHz.

2

C clock.