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*If a +B overcurrent is detected, stoppage of the vertical defl ection is detected simultaneously.  The symptom that is diagnosed fi rst 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 fl ash count is not used for self-diagnostic.

Stopping the Standby/Timer LED Flash
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 fl ashing.

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to fl ash. The number of 
times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/TIMER LED fl ash 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.

Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will fl ash 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 fi rst 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 (Q502) is shorted. (A Board)
•  IC702 is shorted. (C Board)

•  +13V is not supplied. (A Board)
•  IC561 is faulty. (A Board)

•  IC001 is faulty.  (MD 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 defl ection 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.

Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past 
occurrences of failure on the screen for confi rmation.

To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:

DISPLAY

  

 Channel  5      

 Sound Volume  -  

 

 POWER

 

 

Numeral “0” means that no fault was detected.

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

Handling of Self-Diagnostic Screen Display
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.

Clearing the Result Display
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

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.

MD BOARD

IC001

Y/CHROMA JUNGLE

A BOARD

IC561

V. OUT

MD BOARD

IC001

SYSTEM

MD BOARD

IC002

MEMORY

IK-AKBIN

FROM

C BOARD

IC702 PIN 5

I-HLDWN

FROM

A BOARD

IC501

PIN 1

72

O-LED

REF

I-Prot

IO-BDAT

BDA

DISPLAY

51

3

78

79

53

5

+B overcurrent (OCP) 
Occurs when an overcurrent on the +B (135V) line is detected by pin 72 of IC001 (MD Board). If the voltage of pin 72 of IC001 (MD Board) is less than 
1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off. 
I-Prot 
Occurs when an absence of the vertical defl ection pulse is detected by pin 78 of IC001 (MD Board). Power supply will shut down when waveform interval 
exceeds 2 seconds. 
IK (AKB) 
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC001 (MD Board). TV will stay on, but 
there will be no picture.

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

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

1  Remove screws from top of cover.

       4 Screws SCREW +BVTP 3X12 TYPE2 TT (B)

2  Remove screws from sides of cover.

       4 Screws SCREW +BVTP 3X12 TYPE2 TT (B)-2 each side

3  Remove screws from sides of cover.

       4 SCREW +BVTP 4X16 TYPE2 TT (B) - 2 each side

4  Remove rear cover

3

4

2

1

1  Press on catch tab to release the chassis.

2  Gently pull the chassis forward.

1

2

1  Disconnect the CN501 cable from the A Board.

2  Press on catch tab to release A Board.

3  Gently pull the A Board forward to access the GS and HS Boards.

4  Gently continuing pulling the A Board, GS Board and HS Board forward to

       place in service position.

5  Reconnect CN501.