Sharp LC-15AV1U Service Manual page 54

LCD CBA
Measurement Point
CAUTION!
Since the handling of CN310A,CN311A and
CN321A tends to lead to destruction easily ,
be careful of it enough. (especially CN321A.)
CN101A CN102A
9 1 23 1
1 9 1 23
CN111B CN112B
IC333
CN311A CN310A
20 1 50
WF16 WF26 WF11 WF15
Pin 1 - 10 of CN310A
WF11
Pin 11 - 2 of CN321A
YOBI1-YOBI10 2V 20µs
Pin 12 of CN310A
WF12
(LCD MAIN)
10µs
LP 1V
Pin 14 of CN310A
WF13
(LCD MAIN)
10µs
STH1 1V
WF11 ~ WF20 = Waveforms to be observed at
Input: NTSC Color Bar Signal (with 1kHz Audio Signal)
CN103A
23 1
1 23
CN113B
30
CN321A
1
1
WF27 WF31
(LCD MAIN)
Pin 18 of CN310A
WF14
(LCD MAIN)
CLKH
Pin 21 - 24 , 26 - 29 , 31 - 34
WF15
, 36 - 39 , 41 - 44 , 46 - 49
of CN310A
B(0)-B(7)
G(0)-G(7)
R(0)-R(7)
Pin 3 of CN311A
WF16
VREF(0)
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
Waveform check points.
(Shown in Schematic Diagram.)
WF17
WF18
(LCD MAIN)
1V
20ns
WF19
(LCD MAIN)
2V 10µs
WF20
(LCD MAIN)
20µs
1V
9-3
Pin 4 of CN311A
(LCD MAIN)
20µs
VREF(1) 1V
Pin 5 of CN311A
(LCD MAIN)
20µs
VREF(2) 1V
Pin 6 of CN311A
(LCD MAIN)
20µs
VREF(3) 1V
Pin 7 of CN311A
(LCD MAIN)
20µs
VREF(4) 1V
L0270WF3