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SELF DIAGNOSIS FUNCTION ...................................... 4

1. GENERAL ................................................................. 7

2-1. Rear Cover Removal ............................................... 11
2-2. Speaker Removal .................................................... 11
2-3. Chassis Assy Removal ............................................ 11
2-4. Service Position ...................................................... 11
2-5. Terminal Bracket Removal ..................................... 11
2-6. Replacement Of Parts ............................................. 11

2-6-1. Replacement Of Light Guide ....................... 11
2-6-2. Replacement Of Power Button .................... 11

2-7. Picture Tube Removal ............................................. 12

3-1. Beam Landing ......................................................... 13
3-2. Convergence ............................................................ 14
3-3. Focus Adjustment .................................................... 16
3-4. G2 (SCREEN) and White Balance Adjustments ... 16

4-1. Adjustment With Commander ................................ 17
4-2. Adjustment Method ................................................ 17
4-3. Picture Quality Adjustment .................................... 23
4-4. Deflection Adjustment ............................................ 23
4-5. A Board Adjustment After IC003 (MEMORY)

Replacement ............................................................ 23

4-6. Picture Distortion Adjustment ................................ 24

5-1. Block Diagram ........................................................ 25
5-2. Circuit Boards Location .......................................... 27
5-3. Schematic Diagram ................................................. 28

(1) A Board Schematic Diagram ............................ 29
(3) CV Board Schematic Diagrams ........................ 31

5-4. Voltage Measurement ............................................. 32
5-5. Waveforms .............................................................. 35
5-6. Printed Wiring Boards and Parts Location ............. 36
5-7. Semiconductors ....................................................... 39

6-1. Picture Tube and Chassis ........................................ 41

7. ELECTRICAL PARTS LIST .................................... 42

– 4 –

The units in this manual contain a self-diagnosis function. If an error occurs, the STANDBY (1) indicator will automati-
cally begin to flash. A description of the self-diagnosis function is explained in the instruction manual.
The number of times the STANDBY (1) indicator flashes translates to a probable source of the problem. 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 errors occurs, the STANDBY (1) 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.

Result for all of the following diagnosis items are displayed on screen. No error has occured if the screen displays a “0”.

Diagnosis

Item

Description

• Power does not

turn on

• +B overcurrent

(OCP)

• Horizontal

deflection
overdrive

• White balance

failure (no
PICTURE)

• Vertical deflection

stopped

• Micro reset

Detected

Symptoms

• 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.

• Power line is shorted or

power supply is stopped.

• Vertical deflection pulse

 is stopped

• Power is shut down

shortly, after this return
back to normal.

• Detect Micro latch up.

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 the screen.

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

No. of times

STANDBY (1)

indicator flashes

Does not light

2 times

4 times

—

Self-diagnostic

display/Diagnosis

result

—

002:000 or

002:001~255

004:000 or

004:001~225

101:00 or

101:001~225

Probable

Cause

Location

• Power cord is not

plugged in.

• Fuse is burned out

F600 (F)

• H.OUT Q801 is shorted.

(A board)

• -13V is not supplied.

(A board)

• IC 551 faulty (A board)

• Discharge CRT

(C Board)

• Static discharge
• External noise

– 5 –

2. DISPLAY OF STANDBY (1) INDICATOR FLASH COUNT

3. STOPPING THE STANDBY (1) INDICATOR FLASH

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY (1)
indicator from flashing.

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be con-
firmed, it is possible to bring up past occurances 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:

[Screen display] / channel [5] / Sound volume [-] / Power ON

˘

                  Note that this differs from entering the service mode (volume [+]).

STANDBY (1) indicator

Lamp ON 0.3 sec.

Lamp OFF 3 sec.

Lamp OFF 0.3 sec.

2 times

4 times

Diagnosis Item

Flash Count*

+B overcurrent/overvoltage

2 times

Vertical deflection stopped

4 times

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

002 : 000
004 : 000

Numeral "0" means that no fault has been detected.

101 : 000

SELF DIAGNOSTIC

– 6 –

Since the diagnosis 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-diagnosis 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 as shown below when the self-
diagnostic screen is being displayed.

Channel [8]

/ 0

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

[+B overcurrent  OCP ]

Occurs when an overcurrent on the +B(135) line is detected by Q500. If Q500 go to
ON and the voltage to pin 50 of IC301 more than 3.5V when V.SYNC is more than
seven verticals in a period, the unit will automatically turn off.

[Vertical deflection stopped]

Occurs when an absence of the vertical deflection pulse is detected by Pin 17 and
IC001 shut down the power supply.

[White balance failure]

If the RGB levels* do not balance or become low level within 5 seconds, this error
will be detected by IC301. TV will stay on, but there will be no picture.

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

IC301

Y/CHROMA JUNGLE

IC001

SYSTEM

IC003

MEMORY

MP/
PROTECT

11 DAT1

DAT

11 DAT0

5

50

54

SDA

8

FROM
[+B] Q500

17

[V] 
D553

53