Read Sony KV-21FA240 Service Manual online
KV-21FA240
KV-21FA240
8
To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
DISPLAY
Channel 5
Sound Volume -
POWER
Note that this differs from entering the Service Mode (Sound Volume + ).
The following screen will be displayed indicating the error count:
SELF DIAGNOSTIC
2
OCP
: 0
3
OVP
: N/A
4
VSTOP
: 0
Number “0” means that no fault was detected.
5
AKB
: 1
Number “1” means a fault was detected one time only.
8
SUP
: 0
101 WDT
: N/A
SERIAL:
MODEL:
MODEL:
Handling of Self-Diagnostic Screen Display
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you
have completed the repairs, clear the result display to “0”.
Unless the result displ�
Clearing the Result Display
To clear the re�
Channel 8
0
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
A BOARD
IC001
Y/CHROMA JUNGLE
A BOARD
IC804
V. OUT
A BOARD
IC001
SYSTEM
A BOARD
IC003
MEMORY
IK
FROM
C BOARD
IC751 PIN 5
EHTO
FROM
A BOARD
Q816
COLLECTOR
32
RED-LED
F.B-PLS
V. GUARD
SDAO
SDA
DISPLAY
84
3
13
122
5
109
+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
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
V-Protect
Occurs when an absence of the vertical deflection pulse is detected by pin 13 of IC001 (A Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
IK (AKB)
If the RGB levels* do not balance within 15 seconds after the power is turned on, this error will be detected by IC001 (A Board). TV will stay on, but there
will be no picture.
Power Supply NG (+5V) for Video Processor
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to improper power supply to IC001. The TV cuts off high voltage
power of anode CRT. No picture will be detected. eg: faulty IC602 or IC604
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