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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.

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.

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/STEREO 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/STEREO 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/STEREO 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. Due to a hardware upgrade, there is no LED flashing in
sets using Ver.1.0 system micros. This has been addressed in Ver.2.0 system micros.

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.

•  Fuse is burned out. (F5501)

•  Power does not come on.

•  No power is supplied to the TV.

•  AC power supply is faulty.

+B overcurrent (OCP)
(see Note 1)

2 times

2:0 or 2:1

•  H.OUT (Q5030) is shorted. (D board)

•  +B PWM (Q5003) is shorted. (D board)

•  IC9001,IC9002, IC9003 is shorted. (C board)

•  Power does not come on.

•  Load on power line is shorted.

Low B overvoltage (OVP)                 3 times 

3:0 or 3:1 

•   IC6505 is faulty. (D Board) 

•  Has entered standby mode.

Vertical deflection stopped

4 times

4:0 or 4:1

•  +/-15V is not supplied. (D board)

•  IC 5004 is faulty. (D board)

•  Has entered standby state after

horizontal raster.

•   Vertical deflection pulse is stopped.

•  Power line is shorted or power

supply is stopped.

White balance failure
(not balanced)

5 times

5:0 or 5:1

•  Video OUT (IC9001-IC9003) is faulty. (C

board)

•  CRT Drive (IC201) is faulty.  (A Board)

•  G2 is improperly adjusted. (see Note 2)

•  No raster is generated.

•  CRT cathode current detection

reference pulse output is small

LOW B OCP/OVP
(overcurrent/overvoltage)
(see Note 3)

6 times

6:0 or 6:1

•  +5 line is overloaded. (A, B Boards)

•  +5 line is shorted.  (A, B Boards)

•  IC6007 is faulty. (A Board)

•  No picture

Horizontal Deflection
Stopped

7 times

7:0 or 7:1

•  No picture

*One flash count is not used for self-diagnostic.

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/STEREO LED from
flashing.

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is
possible to bring up past occurrences of failure on the screen for confirmation.

In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:

Display

Channel 5

Sound volume

Note that this differs from entering the service mode (sound volume 

).

Power ON

+

SELF DIAGNOSTIC

2: +B OCP

0

3: +B OVP

0

4:  V STOP

0

5: AKB

1

6: LOWB

0

7:H-STOP

0

101: WDT

0

Numeral “0” means that no fault was detected.

Numeral “1” means a fault was detected one time only.

Note 1: If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.

The symptom that is diagnosed first by the microcontroller is displayed on screen.

Note 2: Refer to Screen (G2) Adjustment in Section 3-4 of this manual.

Note 3: If STANDBY/STEREO LED flashes 6 times, unplug unit and wait ten seconds before performing

adjustment.

STANDBY/STEREO LED

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during
repairs. When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion
of the repairs.

To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed,
as shown below:

ENTER

Channel 8

Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

Occurs when an overcurrent (more than 6A) on the +B (135V) line is detected by R6598/
R6591. It will cause Q6520 to turn on and force the AC relay to turn off through Q6532 and
Q6530.

Occurs when 1) overvoltage (more than +140V) on the +B (135V) line is detected by IC6505
or 2) an overvoltage (more than 7.5V) on the unreg 7V line is detected by D6014.  The AC
Relay will turn off through Q6532 and Q6530.

Occurs when an absence of the vertical deflection pulse is detected by IC201. Power supply
will shut down when waveform interval exceeds 2 seconds.

If the RGB levels do not balance within 2 seconds after the power is turned on, this error will
be detected by IC201.  The unit will stay on, but there will be no picture.

*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).

Occurs when set 5V is out.

Horizontal Deflection Stopped Occurs when either 1) a +B overcurrent is detected (IC5007) or 2) overheating is detected

(Thermistor TH5002).

After correcting the original service problem, perform the
following safety checks before releasing the set to the
customer:

1. Check the area of your repair for unsoldered or poorly

soldered connections. Check the entire board surface
for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires are

“pinched” or touching high-wattage resistors.

3. Check that all control knobs, shields, covers, ground

straps, and mounting hardware have been replaced.
Be absolutely certain that you have replaced all the
insulators.

4. Look for unauthorized replacement parts, particularly

transistors, that were installed during a previous repair.
Point them out to the customer and recommend their
replacement.

5. Look for parts which, though functioning, show obvious

signs of deterioration. Point them out to the customer
and recommend their replacement.

6. Check the line cords for cracks and abrasion.

Recommend the replacement of any such line cord
to the customer.

7. Check the B+ and HV to see if they are specified

values. Make sure your instruments are accurate;
be suspicious of your HV meter if sets always have
low HV.

8. Check the antenna terminals, metal trim, “metallized”

knobs, screws, and all other exposed metal parts for AC
leakage. Check leakage as described below.

The AC leakage from any exposed metal part to earth
ground and from all exposed metal parts to any exposed
metal part having a return to chassis, must not exceed 0.5
mA (500 microamperes). Leakage current can be
measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229

or RCA WT-540A. Follow the manufacturers'
instructions to use these instructions.

2. A battery-operated AC milliammeter. The Data Precision

245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means

of a VOM or battery-operated AC voltmeter. The “limit”
indication is 0.75 V, so analog meters must have an
accurate low voltage scale. The Simpson’s 250 and
Sanwa SH-63TRD are examples of passive VOMs that
are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable
(see Figure A).

A cold-water pipe is a guaranteed earth ground; the cover-
plate retaining screw on most AC outlet boxes is also at earth
ground. If the retaining screw is to be used as your earth
ground, verify that it is at ground by measuring the resistance
between it and a cold-water pipe with an ohmmeter. The
reading should be zero ohms. If a cold-water pipe is not
accessible, connect a 60- to 100-watt trouble- light (not a
neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot
side on the line; the lamp should light at normal brilliance if the
screw is at ground potential (see Figure B).

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe