KV-21FA240 - Sony TV Service Manual (repair manual). Page 6

 

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

*If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.  The symptom that is diagnosed first by the mircrocontroller 

is displayed on the screen.

**Refer to Screen (G2) Adjustments in Section 2-4. of this manual.

Standby indicator

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

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED indicator 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 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 LED indicator will flash a set number of times to indicate the possible cause of the problem. If there is more than 

one error, the indicator 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 

+B overcurrent (OCP)* 

V-Protect (OVP)

IK (AKB)

Does not light

2 times *

4 times

5 times

2:0 

or 

2:1 - 255

4:0 

or

 4:1 - 255

5:0 

or 

5:1 - 255

•  Power cord is not plugged in.
•  Fuse is burned out (F600). (A Board)

•  H.OUT (Q805) is shorted. (A Board)
•  IC751 is shorted. (C Board)

•  +13V is not supplied. (A Board)
•  IC804 is faulty. (A Board)

•  Video OUT (IC1545) is faulty(A Board)
•  IC001 is faulty.  (A Board)
•  Screen (G2) is improperly adjusted.**

•  Power does not come on.
•  No power is supplied to the TV.
•  AC Power supply is faulty.

•  Power does not come on.
•  Load on power line is shorted.

•  Has entered standby state after horizontal raster.
•  Vertical deflection pulse is stopped.
•  Power line is shorted or power supply is stopped.

•  No raster is generated.
•  CRT Cathode current detection reference pulse       

output is small.

Power Supply
NG (+5V) for
Video Processor

8 times

8:0 

or 

8:1 - 255

•  IC604 is faulty.
•  IC602 is faulty.

•  No power supply to CRT Anode.
•  No RASTER is generated.