KP-FR43M31, KP-FR43M91 - Sony TV Service Manual (repair manual). Page 5

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Turn off the power switch on the TV main unit or unplug the
power cord from the outlet to stop the STANDBY/TIMER
lamp 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 for confirmation on the screen:

[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander
sequentially in rapid succession as shown below:

+B Overcurrent 

2 tims

Low +B Overvoltage 

3 tims

Vert deflection stopped 

4 tims

White balance failure 

5 tims

Low +B OVP/OCP 

6 tims

Horiz. deflection stopped  7 tims

Audio protection 

8 tims

Zero crossing detector 

9 tims

HV protection 

10 tims

Diagnostic items 

Flash count

* One flash counts is not used for silf-diagnostic.

LED ON 0.3 sec.
LED OFF 0.3 sec.

LED OFF 3 sec.

STANDBY/TIMER

(

)

ON SCREEN

DISPLAY

*(VOLUME)

(POWER)

(DIGIT 5)

2

–

5

:/1

2 OCP

: 0

7

H STOP : 0

3 OVP

: 0

8

A PRT

: 1

4 V STOP : 0

9

Z DET

: 0

5 AKB

: 0

10

HV PRT : 0

6 LOW-B : 0

101 WDT

: 0

Number 1
means a fault was detected one time only.

Number 0
means that no fault detected.

SELF DIAGNOSTIC

Self-Diagnosis is screen display:

*: Note that this differs from entering the service mode

(volume +)

Since the diagnostic results displayed on the screen are
not automatically cleared, always check the self-
diagnostic screen.

After you have completed repairs, clear the result display
to “0”

[Clearing the result display]
To clear the result display to “0”, press button on the remote
commander sequentially as shown below when the
diagnostic screen is being displayed.

Press 

8

 button

(It will indicate “CLEAR” on the screen.)

Press 

-

 button

(The “CLEAR” display change to red color.)

[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power
switch on the remote commander or the main unit.