KV-27S42 - Sony TV Service Manual (repair manual). Page 4

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON
PAINTED ON THE CRT, AFTER REMOVING THE ANODE.

AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY
SERVICE TO AVOID POSSIBLE SHOCK HAZARD, BECAUSE OF
LIVE CHASSIS. THE CHASSIS OF THIS RECEIVER IS DIRECTLY
CONNECTED TO THE AC POWER LINE.

COMPONENTS IDENTIFIED BY SHADING AND MARK 

 ON THE

SCHEMATIC DIAGRAMS, EXPLODED VIEWS, AND IN THE PARTS
LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE
CRITICAL FOR SAFE OPERATION ARE IDENTIFIED IN THIS MANUAL.
FOLLOW THESE PROCEDURES WHENEVER CRITICAL
COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS
SUSPECTED.
ATTENTION

ATTENTION!!

APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER
L'ANODE DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU CHASSIS
METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE
TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.

ATTENTION!!

AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN
CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE
UTILISÉ LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST
DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.

LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE

 SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES

DE PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY
DONT LE NUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU
DANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT
DONT L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT MANUEL. SUIVRE
CES PROCEDURES LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS
CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to flash.
The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED flash
indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the Remote
Commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.

When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If there is
more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.

* Power does not turn on

Does not light

* Power cord is not plugged in.

* Power does not come on.

* Fuse is burned out (F5050)  (E Board)

* No power is suppled to the TV.
* AC power supply is faulty.

* +B overcurrent (OCP)

2  times

2:0 or 2:1

* H.OUT (Q502) is shorted.  (A board)

* Power does not come on.

* IC1751 is shorted.  (C board)

* Load on power line is shorted.

* IC1701 is shorted. (CV board)

*  Vertical  deflection

4  times

4:0 or 4:1

* +13V is not supplied. (A board)

*  Has  entered  standby  state  after

   stopped*

   horizontal raster.

* IC 541 is faulty (A board)

* Vertical deflection pulse is stopped.
* Power line is shorted or power supply
   is stopped.

* White balance failure

5  times

5:0 or 5:1

* Video OUT (Q306 to 308) is faulty.(A bd)

* No raster is generated.

   (not balanced)

* IC301 is faulty.  (A board)

* CRT cathode current detection

* G2 is improperly adjusted**.

   reference pulse  output is small.

* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simulatneously. The symptom that is diagnosed first by the
   microcontroller is displayed on the screen.

** Refer to Screen (G2) Adjustment in Section 3-4 of this manual.