KV-HV212M50 - Sony TV Service Manual (repair manual). Page 5

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[+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

EHT0

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.