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- 4 -

To monitor the high voltage, the positive DC voltage from the
cathode D510 is applied through R595 and other resistors to
pin 6 of IC402, which is the input terminal of the X-ray Pro-
tection Circuit. The voltage at pin 6 of IC402 is adjusted by
R581 same voltage at pin 5 of IC402 with high voltage is
36kV. Under normal conditions this voltage is insufficient to
activate the X-ray Protection Circuit.

If the high voltage increases over the specified voltage, the
voltage at pin 6 of IC402 increases and causes the X-ray
Protection to activate. Then it causes the shut down works.

In the process described above, the voltage at pin 6 of IC402
is compared with the voltage at pin 5 of IC402 which is basi-
cally a constant voltage fed from the Zener Diode D404. If
excessive beam current is drawn, the voltage at pin 6 of
IC402 increases. When the voltage at pin 6 of IC402 over the
voltage at pin 5 of IC402, the voltage at pin 7 of IC402
becomes “high” and feeds into Base of Q401, and the volt-
age at Corrector of Q401 becomes “high” and feeds into pin
28 of micro-controller IC1009 through D409 and R1097. The
micro-controller then turns off Q845, causes the AC power
relay RL801 to unlatch and turns off the receiver.

To prevent any adjustment on the sealed control after final
adjustment is done at factory. If the sealant are removed
for any reason, the control is damaged at same time.

1. Silicone-Type T8C1710201H, manufactured by Shin-Etsu 

Chemical Co., Ltd. (Japan)

2. Hard ABS tube-Type TMMX004

No tool is required.

1. Place the hard ABS tube on the designated sealed con-
trol,

as shown in Figure a.

Figure a.

2. When the tube is gently pressed all the way down and

adhere to the P.C.B., apply the silicon into the hard ABS
tube and form hemisphere like object on the top of tube, a

shown in Figure b.

Figure b.

5

6

1

+

-

+

-

X-Ray Detect

28

7

7

5

6

12V

R849

Q845

R850

C850

R1050

IC1009

R1097

D409

R411 Q401

R418

R423

R431

C408 C410

R420

R515

R581

R630

R514

R513

FBT T551

D510

C555

D404

5V

9V

EHT

CRT

IC402

AC POWER RELAY

RL801

Comparator Ref.

Comparator out

Comparator in

Silicone

!"#$

- 5 -

When symptoms like "the power fails sometimes" or "sometimes there is no picture and/or sound" can not be confirmed at the
time of servicing, the self-check function can be used to confirm the occurrence and to find the defective circuit.
In case of "power failure", flashing of the "VIDEO IN" indication (red) at the front of the unit can be used to narrow down the +B
line.

<Indication method>
Input a 1080i signal or NTSC Sig-
nal, press the SLEEP button on 
the remove control 
simultaneously with the 
"VOLUME -" button on the unit.
(The display will be switched to 
the screen of VIDEO 1 and the 
screen shown on the right will be 
displayed.)

<Return to the normal screen>
Return to the normal screen will
be made by POWER or any other
remote control operation.

ASPECT INPUT

VOLUME

[ VOLUME    ] Button

[SLEEP]
Button

POWER GAME INPUT

RECALL

MUTE

SLEEP

POWER SAVE

VOL

ASPECT

SELF ASPECT

CT-34WDM60

OK H49

HM IC8618

IIC/1

IIC/2

Check result of IC

"OK"

Normal

"NG"

Abnormal
(Check IC or its nearby components)

OK H30

J/IC4001

OK H32

/IC4007

OK H14

A/IC3061

OK H94

DP/IC5607

OK H92

GY/IC5203

OK H38

X/IC2601

OK H21

Z/IC2401

OK H50

F/IC402

OK H44

IC5706

OK H93

IC5205

OK H34

IC2701

OK H51

IC604

OK H45

IC5712

OK H36

IC5204

OK H46

IC5208

OK H37

IC2702

OK H52

IC610

OK H39

IC4002

OK H33

IC4008

OK H90

IC3071

OK H31

IC4003

ID

H14

BBE and LED does not work.

Exchange IC3061.

A-Board

H90

Picture and/or sound can not be adjusted.

Exchange IC3071.

H21

No sound

Exchange IC2401

Z-Board

H30

Video input is not possible.

Module exchange

J-Module

H31

Video input is not possible.

H32

No sound and No picture

H33

No video from component (color difference) input

H39

Sound switching is not possible.

H34

No video, defective OSD

Module exchange

X-Module

H37

Defective OSD

H38

No video, defective OSD

H36

The NTSC signal is displayed, but the 1080i signal is not
displayed.

Module exchange

DP-Module

H44

H45

H94

H46

No NTSC video

Module exchange

GY-Module

H92

H93

H49

Synchronization not possible

Module exchange

HM-Module

H50

Horizontal and vertical synchronization not stationary

Exchange IC402.

F-Board

H51

Earth magnetism compensation does not operate.

Exchange IC604.

H52

The servicing item "distortion correction" does not operate.

Exchange IC610.

!"#$

- 6 -

Switching po

w

er supply (T802)

+23 V output

+5 V output

+3.3 V output

IC3101

IC3106

IC3105

To each module

E-Board    F-Board

E-Board    F-Board

E-Board    L-Board

To L-Board

E-Board    A-Board

To each module

To each module

To each module

D3039 D3040

D3050 D3051

D3035 D3036

R6841

D6837

R6836

D6835

R6840

R6843

D6838

D6841

R6834

R6835

R6838

R6839

Q6831

Q6832

Q3017

R6831

R6832

R888

R833

R832

R887

R6833

Q879

D6833

D888

R890

Q890

D899

D890

D832

Q831

R835

R836

D831

BS +15 V output

+12 V output

+6 V output

IC3110

IC3109

+6 V output

IC881

+5 V output

IC3107

T3001

(BT +30 V output)

Switching

transformer

D3011 D3038

Audio +23 V

+15 V

+140 V

-15 V

+23 V

Switching pulse

TV 
+23 V

TV 
+208 V

TV 
+130 V

To L-Board
(heater voltage)

f

b

c

g

TV
+208 V
constant
voltage

IC891

TV
+130 V
error
detection

IC871

R831

E-Board  

    

F-Board

 

35
27
28
23

A20

Standby
microcomputer

Main
microcomputer

1

F6

25
40
41

U-Module

F-Board

Standby +5 V output

IC3111

Standby +B

a

e

d

 

L-Board

This unit is equipped with a protector circuit for the case when the +B line on the secondary side of the switching power supply

is short-circuited at all times.

Abnormalities are detected for seven +B lines per switching power supply.

(1) Lines  

 ,  

  ,  

  , and 

  in the above figure

•

The collector of each transistor for detection of abnormalities becomes "H", and a voltage of about 2.5 V or about 5.0 V is
impressed to the microcomputer.

(2) Line 

 in the above figure

•

Abnormality detection for each regulator output voltage is performed by Zener diode and protection ON/OFF diode.

•

When the regulator output voltage rises, the withstand voltage fault voltage is applied to the Zener diode, the protection ON/
OFF diode is switched to ON by this fault detection, and a voltage of about 5.0 V is impressed to the microcomputer.

(3) Lines 

 and 

 in the above figure

•

The lines 

 and 

 both are the reset input voltage for the standby microcomputer, and when this input voltage is not pro-

vided as input to the standby microcomputer, the fault detection operates.

•

When fault detection operates, the microcomputer switches the relay of the switching power supply to OFF.

•

When the power has been cut off by the power supply protector (or by detection of abnormal high voltage), the "Power supply/
function standby/video reception" LED at the front of the unit flashes one to seven times at the time of power supply protector
operation (detection of abnormal high voltage) to facilitate discrimination of the fault location.

a

b

c

g

d

e

f

e

f

!"#$

- 7 -

 When an abnormality has occurred for a power supply line, the protection circuit (power supply protector/detection of abnormal
high voltage) operate and cuts the power supply. At this time, the defective line can be identified by the number of flashes (red) of
the "Power supply/function standby/video reception" indication at the front of the unit by means of the fault line which has oper-
ated the protection circuit.

*Other than the above, the contents partly may differ according to the fault location.

•

Flashing twice: +6 V voltage drop (-> refer to the flowchart on page 9)

•

Flashing three times: +6 V voltage drop (-> refer to the flowchart on page 10)

•

Flashing four times: +130 V/+208 V voltage drop (refer to the flowchart on pages 11 and 12)

•

Flashing five times: +23 V voltage drop (-> refer to the flowchart on page 9)

•

Flashing six times:  +15 V/+23 V voltage drop (refer to the flowchart on pages 13 and 14)

Flashing

Flashing timing

Contents

Once

Twice

Three times

Four times

Five times

Six times

Seven times

Once

3 sec

No Light

Light

CRT drive +32 kV 
voltage rise (  g  )

RGB drive +208 V,
vertical drive -15 V 
voltage drop (  b  )

Vertical drive +15 V/ -15 V,
+23 V/audio +23 V 
voltage drop (  a  )

 +15 V/+ 12 V/+9 V/+5 V
/+3.3 V/BT +30 V 
voltage rise (  d  )

+3.3 V voltage drop (  f  )

+130 V overcurrent 
detection (  c  )

+5 V voltage drop (  e  )

% !"#$