Read Sharp LL-T1500A (serv.man7) Service Manual online
CHAPTER 6. WAVE FORM
Waveform measurement condition: Input each of the display patterns
and measure the waveform (timing chart).
and measure the waveform (timing chart).
Wave-form
No.
Measurement point
Name of waveform
Display pattern
1
22nd pin of the U10
X1
Arbitrary
2
17th pin of the U10
TO_MCU_V
Arbitrary
3
15th pin of the U10
TO_MCU_H
Arbitrary
4
8th pin of the JP4
CLK
Arbitrary
5
14th pin of the JP4
BDE_OUT
Arbitrary
6
15 pin of the U5
DS
Arbitrary
7
8th pin of the U2
CLKOUT
Arbitrary
8
29th pin, 32nd pin, and 35th pin of the U7
PRE-Amp RGB OUT
16 monochromatic gradation patterns
9
52nd ~ 59th pins and 62nd ~ 89th pins of (R) of the U2
32nd ~ 39th pins and 42nd ~ 49th pins of the (G) of the U2
12th ~ 19th pins and 22nd ~ 29th pins of (B) of the U2
32nd ~ 39th pins and 42nd ~ 49th pins of the (G) of the U2
12th ~ 19th pins and 22nd ~ 29th pins of (B) of the U2
A/D OUT DATA
Monochrome pattern at every 2 lines
10
53rd ~ 59th pins, 63rd ~ 69th pins, and 73rd ~ 79th pins, 83rd ~
89th pins, 93rd ~ 99th pins, and 103rd and 109th pins of the U1
89th pins, 93rd ~ 99th pins, and 103rd and 109th pins of the U1
ASIC OUT DATA
Monochrome pattern at every 2 lines
11
13th, 14th, and 15th pins of the U8
OSD COLOR DATA
Black pattern on entire screen OSD menu
display
display
CAUTION
(1) Use the probe TektronixP6139A.
(2) Reception mode: VESA 1024 x 768 H:60.024 Khz
V:75.075 Hz DOTCLK: 78.750MHz
Oscilloscope
:
Tektronix TDS744A
Input signal
:
VESA1024 x 768
H: 60.02 kHz V: 75.075 Hz
DOTCLK: 78.750 MHz
H: 60.02 kHz V: 75.075 Hz
DOTCLK: 78.750 MHz
WAVE FORM 1 : X1(22th pin of the U10.)
Frequency :
8.000MHz
Display screen : arbitrary
WAVE FORM 2 : TO_MCU_V(17th pin of the U10.)
Frequency :
75MHz
Display screen : arbitrary
WAVE FORM 3 : TO_MCU_H(15th pin of the U10.)
Frequency :
60 KHz
Display screen : arbitrary
WAVE FORM 4 : CLK(8th pin of the JP4.)
Frequency :
35 MHz
Display screen : arbitrary
WAVE FORM 5 : BDE_OUT(14th pin of the JP4.)
Frequency :
60 KHz
Display screen : arbitrary
WAVE FORM 6 : DS(15th pin of the U5.)
Frequency :
60 KHz
Display screen : arbitrary
WAVE FORM 7 : CLKOUT(8th pin of the U2.)
Frequency :
40 MHz
Display screen : arbitrary
WAVE FORM 8 : PRE-Amp RGB_OUT
(29th pin ,32dn pin, 35th pin of the U7.)
Display screen : monochrome 16 pattern
WAVE FORM 9 : A/D OUT DATA
(52nd~59th pins and 62nd~69th pins of the U2 (R)
32nd~39th pins and 42nd~49th pins of the U2 (G),
12th~19th pins and 22nd~29th pins of the U2 (B))
32nd~39th pins and 42nd~49th pins of the U2 (G),
12th~19th pins and 22nd~29th pins of the U2 (B))
Display screen : monochrome pattern at every 2
lines
WAVE FORM 10 :ASIC OUT DATA
(53rdh~59th pins and 63rd~69th pins and
73rd~79th pins and 83rd~89th pins and 93th~99th
pins and 103rd~109th pins of the U1)
73rd~79th pins and 83rd~89th pins and 93th~99th
pins and 103rd~109th pins of the U1)
Display screen : monochrome pattern at every 2
lines
WAVE FORM 11 :CSD COLOR DATA
(13rd pin, 14th pin, 15th pin of the U8)
Display screen : all black pattern
OSD menu display
Enlargement
Enlargement
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