KP-57WV600 (serv.man2) - Sony TV Service Manual (repair manual). Page 8

Occurs when excessive current flows through R5013. The increase in voltage across R5013 causes the output of Q5004 to go high, and this high 

signal goes to the micro. 

IC6505 detects +B OVP condition and turns on Q6522. This sends a high signal to the micro and also shuts down the AC relay.

Occurs when an absence of the vertical deflection pulse is detected by pin 24 of IC2801 (B Board). Power supply will shut down when waveform 

interval exceeds 2 seconds. 

If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC2801. TV will stay on, but there will be 

no picture.

*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).

Occurs when set 5V is out.

Occurs when either: 

 

1) a +B overcurrent is detected (IC5007), or 

 

2) overheating is detected (Thermistor TH5002).

1

2

4

3

3

1

2

R5104

R5105

R5125

Q5018

RY6501

Q6527

Q6530

Q6532

D6537

D6505

D5007

PH6501

Q5004

R5013

D5005

IC6505

Q6522

1K-PROT2

+B OVP

HV PROT

UNREG 11V

5V

UNREG 7V

+B OCP

2

1

3

4

IC5007

VDY-

CRT

IC2801

Y/C JUNGLE

SCL

SDA

AKB

VPROT

HPROT

IC2300

MAIN MICRO

MB

CLKO

DATO

AC RLY

LOW B ERR

OVP

OCP

STR
STBY-LED

STBY-LED

P_SW(-)

IC504

5V

+B

+B

+B

D

B

MB

D

D

A

2

14

34

35

58

26

25

29

30

69

43

44

45

48

O

I

O