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*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.

 

+B Overcurrent 

 

2 times

 

I-Prot 

 

 

4 times

 

IK (AKB)   

 

5 times

 

*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/TIMER LAMP from flashing.

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 

+B overcurrent (OCP)* 

I-Prot

IK (AKB)

Does not light

2 times

4 times

5 times

2:0 or 2:1

4:0 or 4:1

5:0 or 5:1

• Power cord is not plugged in.
• Fuse is burned out (F601). (A Board)

• H.OUT (Q505) is shorted. (A Board)
• IC1751 is shorted. (CV Board)

• +13V is not supplied. (A Board)
• IC545 is faulty. (A Board)

• Video OUT (IC545) 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.

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  -  

 Power ON

Numeral “0” means that no fault was detected.

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

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:

Channel  8 

  ENTER

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

Occurs when an overcurrent on the +B (135V) line is detected by pin 72 of IC001 (A Board). If the voltage of pin 72 of IC001 (A Board) is less than 1V 

when V.SYNC is more than seven verticals in a period, the unit will automatically turn off. 

Occurs when an absence of the vertical deflection pulse is detected by pin 78 of IC001 (A Board). 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 IC001 (A Board). TV will stay on, but 

there will be no picture.

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

Note that this differs from entering the Service Mode (Sound Volume  + ).

A BOARD

IC001

Y/CHROMA JUNGLE

A BOARD

IC545

V. OUT

A BOARD

IC001

SYSTEM

A BOARD

IC002

MEMORY

IK-AKBIN

FROM

CV BOARD

IC1751 PIN 5

I-HLDWN

FROM

A BOARD

IC561

PIN 7

72

O-LED

REF

I-Prot

IO-BDAT

BDA

DISPLAY

51

3

78

79

53

5

Chassis Assembly

Claw

6 

Screws +BVTP 4X16 TYPE2 TT(B)

Rear Cover

A Board

KB Board

CV Board

1

Unplug  KB  Board    and  2  pin  woofer  connector  and  move  out  of                      

the way.

2

Press on catch tab to release A Board.

3

Disconnect remaining cables to allow A Board to be removed. 

1.  Discharge the anode of the CRT and remove the anode cap.

2.  Unplug all interconnecting leads from the defl ection yoke, neck 

assembly, degaussing coils and CRT grounding strap.

3.  Remove the CV Board from the CRT.

4.  Remove the chassis assembly.

5.  Loosen the neck assembly fi xing screw and remove.

6.  Loosen the defl ection yoke fi xing screw and remove.

7.  Place the set with the CRT face down on a cushion and remove 

the degaussing coil holders.

8.  Remove the degaussing coils.

9.  Remove the CRT grounding strap and spring tension devices.

10. Unscrew the four CRT fi xing screws [located on each CRT 

corner] and remove the CRT  [Take care not to handle the CRT 
by the neck].

Coated

Earth

Ground 

Strap

WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electric shock, discharge CRT before attempting to  
remove the anode cap.  Short between anode and coated earth ground strap of CRT. 
NOTE:  After removing the anode cap, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield, or carbon 
painted on the CRT. 

1.  Do not use sharp objects which may cause damage to the surface of the anode 

cap. 

2.  To avoid damaging the anode cap, do not squeeze the rubber covering too 

hard. A material fi tting called a shatter-hook terminal is built into the rubber. 

3.  Do not force turn the foot of the rubber cover. This may cause the shatter-hook 

terminal to protrude and damage the rubber.

10

6

5

4

3

1

2

Turn up one side of the rubber cap in 
the direction indicated by arrow  a  .

Use your thumb to pull the rubber
cap fi rmly in the direction indicated
by arrow  b  .

When one side of the rubber cap separates from 
the anode button, the anode cap can be removed 
by turning the rubber cap and pulling it in the 
direction of arrow  c  .

8

7

9

a

b

Anode Button

c