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– 4 –

[+B overcurrent $OCP%]

Occurs when an overcurrent on the +B(135V) line is detected by pin 32 of IC001 (A board).
If the voltage of pin 32 of IC001 (A board) is more than 4V, the unit will automatically go to
standby.

[V-PROTECT]

Occurs when an absence of the vertical deflection pulse is detected by pin 13 of IC001
(A board).

[IK $AKB%]

If the RGB levels* do not balance within 15 sec after the power is turned on, this error will be
detected by IC001 (A board). TV will stay on, but there will be 5 times LED blinking.

Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to
improper power supply to IC001. TV cuts off high voltage power of anode CRT. No picture will be
detected. eg: IC602, IC604 go faulty.

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

A BOARD

IC001

Y/CHROMA JUNGLE

A BOARD

IC804

V.OUT

A BOARD

IC001

SYSTEM

A BOARD

IC003

MEMORY

FROM

C BOARD

IC751 PIN 5

IK

EHTO

RED LED

DISPLAY

SDA1

V.GUARD

SDA

5

F.B-PLS

3

13

84

32

122

A BOARD

FROM

Q816

COLLECTOR

99

POWER SUPPLY NG (+5V)
for VIDEO PROCESSOR

2 : 

000

3 :

000

4 :

000

5 :

001

8 :

002

101 :

N/A

"0" means no fault has been detected.

"1" means a fault has been detected.
"2" means two faults have been detected.

"N/A" means not available for this models.

SELF DIAGNOSTIC

5

8

1.

Display self diagnostic screen

[Display] t [Channel    ] t [Volume    ] t [Power / TV]

Note: The above must be performed while TV is on standby mode.

2.

Stop standby flash

i) Turn off power switch on main.
ii) Unplug power cord from the outlet.

3.

Clear fault result

[Channel    ] t 

-

Note: Diagnostic results display on screen is not automatically cleared. Therefore,
clear result after completion of repair.

4.

Quit self diagnostic screen

Turn off power switch of remote commander or main unit.

– 5 –

2 A Board

3 Terminal bracket

4 One screw
     (+BVTP 4 

× 16

     TYPE2 IT-3)

1 One screw
     (+BVTP 3 

× 12

     TYPE2 IT-3)

5 Two screws
     (+BVTP 3 

× 12

     TYPE2 IT-3)

1  Eight screws
     (+BVTP 4 

× 16 TYPE2 IT-3)

2 Rear cover

A Board

1 Two screws

SCREW (WH DIA.16)
(+P4 

× 16)

– 6 –

• After removing the anode, short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT shield

or carbon paint on the CRT.

• REMOVING PROCEDURES

1 Turn up one side of the rubber cap in the direction

a.

2 Using a thumb pull up the rubber cap firmly in the

b.

3 When one side of the rubber cap is separated from the

c.

• HOW TO HANDLE AN ANODE-CAP

1 Do not damage the surface of anode-caps with

2 Do not press the rubber too hard so as not to

3 Do not turn the foot of rubber over too hard.

A

A

B

B

C

 Anode Button

• Please make sure the TV set is not in standing position before removing necessary CRT support located on bottom right

and left.

1) Remove the Rear Cover.
2) Unplug all interconnecting leads from the Deflection Yoke, Neck Assy, Degaussing Coils and CRT grounding strap. Remove

Chassis Assy.

3) Place the TV set with the CRT face down on a cushion (jig).

qd

 Screw, Tapping 5 + Crown Washer (x4)

4

 Anode Cap Removal

7

 Degaussing Coil

6

 Loosen the Neck Assembly
 fixing screw and remove 
 Neck Assy & VM board

qa

 Loosen the Deflection Yoke
 fixing screw and remove

5

 C Board Removal

qf

 Chassis Assy
 Removal

9

 Spring Tension (2)
 Removal

 

8

 Holder, DGC
 Removal (x2)

0

 Earth Coating Assy

qs

 Supports, CRT
  Removal (x2)

– 7 –

The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.

The controls and switch should be set as follows unless
otherwise noted:

Picture control ......................................................... NORMAL
Brightness control ................................................... NORMAL

Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. G2 (SCREEN)
5. White Balance

Note: Test Equipment Required
1. Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter

Preparation :
• Feed in the white pattern signal.

• Before starting, degauss the entire screen with the

degausser.

• In order to reduce the geomagnetism on the set's

picture tube, face it east or west.

1. Input a raster signal with the pattern generator.
2. Loosen the deflection yoke mounting screw, and set the

purity control to the center as shown below.

3. Set the raster signal of the pattern generator to green.
4. Move the deflection yoke (DY) backward and adjust the

purity control so that green is in the center and blue and
red are at the sides evenly.

5. Then move the DY forward and adjust so that the entire

screen becomes green.

6. Now switch over raster signal to red then blue and

confirm the condition.

...................................................................................................................................................................................................................... ...........

5. Oscilloscope
6. Landing Checker
7. XCV Adjuster

Purity control

Red

Blue

Green

7. When the position of the DY is determined, tighten it

with the DY mounting screw.

8. If the beam does not land correctly in all corners of the

screen, use magnet disc to correct it.

Preparation :
• Before starting, perform FOCUS adjustment.

• Picture mode STANDARD.

• Receive dot/cross hatch pattern.

Purity control
corrects this area.

Disc magnets or rotatable
disc magnets correct these
areas (a-d).

Deflection yoke positioning
corrects these areas.

a

b

b

c

c

d

d

a

Center dot

R    G    B

R

G

B

4 pole magnet

RV750
H. STAT

C/CV Board