DOWNLOAD Sony KP-43HT20C / KP-53HS30C Service Manual ↓ Size: 9.55 MB | Pages: 127 in PDF or view online for FREE

– 6 –

•      In cases of malfunctions where it is not possible to determine the symptom such as when the power goes off occasionally or when 

the screen disappears occasionally, there is a screen display on whether the malfunction occurred or not in the past (and whether 

the detection circuit operated or not) in order to allow confi rmation.

      

•      Quickly press the remote command button in the following order from the standby state.

•      The results display is not automatically cleared.  In case of repairs and after repairs, check the self-diagnosis screen and be 

sure to return the results display to “ 0 ”. 

•      If the results display is not returned to “ 0 ” it will not be possible to judge a new malfunction after completing repairs.

1. Power off (Set to the standby mode)

2. DISPLAY   

è

   Channel    5    

è

   VOL    +   

è

    POWER    (Service Mode

3. Channel    8   

è

   ENTER   (Test reset = Factory preset condition)

•      When ending the self-diagnosis screen completely, turn the power switch OFF on the remote commander or the main unit.

   

ñ

   Be aware that this differs from the method of 

   entering the service mode (volume   +   ).

DISPLAY   

è

   Channel    5    

è

  VOL    –    

è

   POWER

SELF DIAGNOSIS

    2 : +B  OCP

N/A

    3 : +B  OVP

N/A

    4 : V STOP

0

    5 : AKB

1

    10 : WDT

24

Numeral “0” means that no fault
was detected.

Numeral “1” means a fault was detected
one time or more

– 7 –

OCP 

Low B and +B line detect DET SHORT, and shut-down POWER ON RELAY. 

       

Reset by turning power on/off. 

       

In case of +B is loaded approx. 1.5A or more, microcomputer detects it via IC5005 

OVP 

In case of +B becomes approx. 150V or more, POWER ON RELAY shuts down and microcomputer detects it via IC5005. 

       

Reset by turning power on/off just the same as OCP. 

Low B 

Occurs when set +5V is out

V Stop 

In case of V Drive disappeared, Q8001 detecs it and shut-down POWER ON RELAY. Microcomputer detects it and makes LED 

 blinking. 

AKB 

IK detection.  Makes LED blinking in case of microcomputer doesn’t detect IK returns of IC309  (CXA2150AQ) 20 seconds or   

 more. 

H Stop 

In case of H DRIVE is disappeared, Q378 detects it and shut-down POWER ON RELAY shuts down. 

       

Microcomputer receives H Stop data from Q378 and makes LED blinking.

HV Stop  In case of HV becomes 33KV or more. IC8006  detects it and shut-down

       

POWER ON RELAY. Microcomputer makes LED blinking. 

Audio 

In case of DC component overlaps the output of Audio Amp., POWER ON RELAY shuts down. 

       

Microcomputer detects it and makes LED blinking. 

       

49

53

43

24

45

44

31
28
29

25

58

35

34

5. AKB

5. AKB

4. V STOP

3. OVP

2. OCP

6. LOW B

8. HV.STOP

9. Audio

IC704

MAIN-CPU

IC309

CXA2150AQ

Y/C JUNGLE

D9101

TIMER/STANDBY

R765

IC702

EEPROM

IC703

EEPROM

Q714

+5V DETECT

Q378

H PULSE

Detector

IC8006

HV Detector

Q8001

V Pulse Detector

IC5005

 OVP Buffer

OCP Buffer

C Board

DC Detect

IC8003
V Drive

IC708

6. H STOP

BUS

26

30

OVP DETECT

OCP DETECT

Audio AMP

– 8 –

2  

 Rear board

1

   Eleven screws (Screw(4x20), tapping)

1

   Three screws

  (Screw(4x20),tapping)

2  

 Chassis assy

1

   Disconnect CN17, 18, 19 

     on A board.

From V boards CN9001.

(The extension cable is not 
  supplied because of the
  countermeasure for radiation.)

D board

CN17, 18, 19

A board

Cut them off with a plier or the like
from chassis assembly in case of 
checking printed circuit boards.
After checking, turn over the covers 
and secure them with screws.

Screws
(+BVTP3x12)

Chassis assembly      

2

   Covers

2

   Screw, dome washer

     HEX tap 4x20

2

   Screw, dome washer

     HEX tap 4x20

3

   Six screws

     (+BVTP4x12)

1

   Cap, speaker grille

1  

 Cap, speaker grille

4

   H2 board

5

   Button, multi

– 9 –

1

   Twenty three screws

     (Screw(4x20), tapping)

2

   Mirror cover

1

   Two screws

     (+BVTP4x12)

3

   Screw

     (+BVTP4x12)

4

   H1 board

6

   Button, power

2

   Bracket H1

5

   Screw

     (+BVTP4x12)

7

   Guide, LED

1

  Screws

    (+BVTP4x20)

2  

 Holder, front terminal

     (Except 43HT20)
     Holder, side terminal
     (43HT20)

4

   Bracket, H3

6

   Screw

     (+BVTP3x12)

3

   Two screws

    (+BVTP3x12)

5

   Door, front terminal

     (Except 43HT20)
      Door, side terminal
      (43HT20)

7

   H3 board

2

   Holder, side terminal

4

   Bracket, H3

6

   Screw

  (+BVTP3x12)

3

   Two screws

  (+BVTP3x12)

5

   Door, side terminal

7

   H3 board

1