Read Sony KV-VF21M40 Service Manual online
– 7 –
6.
SELF-DIAGNOSTIC CIRCUIT
[+B overcurrent]
Owing to current increase voltage of R615 decrease and that it make PM601 pin
8
to
become LOW and OFF RY601.
[+B over voltage]
When +B voltage become more than 142.5V, PM601
8
pin become LOW and RY601
OFF.
[Vertical deflection stopped]
Detect Vertical deflection Pulse lost by IC001
^º
pin of micro computer.
Mute the picture at
!
∞
pin of IC301 that performed by Y/C/J.
[White balance]
Detect when R.G.B. output wrong level balance of automatic white balance detecting
standard pulse which detect cathode current, or which become low almost.
standard pulse which detect cathode current, or which become low almost.
CRT
7
3
62
52
60
49
47
41
A
42
43
A
37
21
34
35
15
SCL1
SDA1
V PULSE
LED1
OVP
VCR
RY601
RELAY
Q601
ITEM 2.
Over voltage
Detection(OCP)
BOOST
VCC
IC501
IC301
Y/C/J
HP/
PROTECT
SDA
SCL
IK IN
VM OUT
R,G,B STOP
To item 2 and 5 via bus line
MEMORY
V
•
STOP
IC004
R
•
G
•
B
ITEM 5.
Auto cut-off white balance detection(AKB)
8
3
1
PM601
D1308
PM21
FBT
(T801)
(T801)
C504
✩
Diagnostic screen display
Q606
R614
D502
R656
+B LINE
R615
Q502
Q501
C505
R510
IC001
µ
-COM
LED flash
STANDBY
lamp
3
4
2
1
ITEM 3
Over current
Detection(OVP)
ITEM 4.
Vertical Deflection
output Detection
(V
•
STOP)
R613
R611
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