Sharp LL-T1810A (serv.man3) Service Manual ▷ View online
CHAPTER 4. WAVE FORM
1. WAVE FORM DESCRIPTION
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
22 pin of the IC34
XIN
Arbitrary
2
9 pin, 18 pin of the IC14
VSYNC
Arbitrary
3
8 pin, 17 pin of the IC14
HSYNC
Arbitrary
4
6 pin of the IC34
MPU VSY
Arbitrary
5
7 pin of the IC34
MPU HSY
Arbitrary
6
FL4, FL3
LCD CLKA, CLKB
Arbitrary
7
FL2, FL5
LCD DEA, DEB
Arbitrary
8
24 pin of the IC24
DSYNC
Arbitrary
9
8 pin of the IC23
ADCLKOUT
Arbitray
10
25 pin of the IC14
SOGOUT
16 monochromatic gradation patterns
11
27 pin, 30 pin, and 35 pin of the IC14
VSwitch RGB OUT
16 monochromatic gradation patterns
12
16 pin of the IC401, IC402 and IC403
VAmp RGB OUT
16 monochromatic gradation patterns
13
52 ~ 59 pins and 62 ~ 69 pins of (R) of the IC23
32 ~ 39 pins and 42 ~ 49 pins of the (G) of the IC23
12 ~ 19 pins and 22 ~ 29 pins of (B) of the IC23
32 ~ 39 pins and 42 ~ 49 pins of the (G) of the IC23
12 ~ 19 pins and 22 ~ 29 pins of (B) of the IC23
A/D OUT DATA
Monochrome pattern at every 2 lines
14
242 ~ 259 pins, 262 ~ 268 pins, 276 ~ 278 pins,
281 ~ 292 pins, and 295 ~ 302 pins of the IC27
281 ~ 292 pins, and 295 ~ 302 pins of the IC27
ASIC IN DATA
Monochrome pattern at every 2 lines
15
156 ~ 163 pins, 166 ~ 174 pins, 177 ~ 183 pins, 191 ~ 204 pins, and
207 ~ 216 pins of the IC27
207 ~ 216 pins of the IC27
ASIC OUT DATA
Monochrome pattern at every 2 lines
16
1, 3, 4, 6, 7, 9, 10, 12, 13, 17, 18, 20, 21, 60, 61, 63, 64, 68, 69, 71, 72,
74, 75, 77, 78, 80, 81, 83, 84, 97, 98 and 100 pins of the IC8, IC9, and
IC10
74, 75, 77, 78, 80, 81, 83, 84, 97, 98 and 100 pins of the IC8, IC9, and
IC10
SGRAM IN/OUT
DATA
DATA
Monochrome pattern at every 2 lines
17
13, 15, and 17 pins of the IC31
OSD COLOR DATA
Black pattern on entire screen OSD
menu display
menu 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
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: 78.750MHz
H: 60.02 kHz V: 75.075 Hz
DOTCLK: 78.750MHz
WAVE FORM 1 : XIN (22 pin of the IC34)
Frequency 7.987MHz
Display Screen : arbitrary
WAVE FORM 2 : VSYNC (9 pin, 18th pin of the IC14)
Frequency 75Hz
Display Screen : arbitrary
WAVE FORM 3 : HSYNC (8 pin, 17 pin of the IC14)
Frequency 80kHz
Display Screen : arbitrary
WAVE FORM 4 : MPU VSY (6 pin of the IC34)
Frequency 75Hz
Display Screen : arbitrary
WAVE FORM 5 : MPU HSY (7 pin of the IC34)
Frequency 80kHz
Display Screen : arbitrary
WAVE FORM 6 : LCD CLKA, CLKB (FL4, FL3)
Frequency 50MHz
Display Screen : arbitrary
WAVE FORM 7 : LCDDEA, DEB (FL2, FL5)
Frequency 70kHz
Display Screen : arbitrary
WAVE FORM 8 : DSYNC (24 pin of the IC25)
Frequency 80kHz
Display Screen : arbitrary
WAVE FORM 9 : ADCLKOUT (8 pin of the IC23)
Frequency 65MHz
Display Screen : arbitrary
WAVE FORM 10 : SOGOUT (25 pin of the IC14)
Display Screen : 16 monochromatic gradation patterns
WAVE FORM 11 : VSwitch RGB OUT (27 pin , 30 pin and
35 pin of the IC14)
Display Screen : 16 monochromatic gradation patterns
WAVE FORM 12 : VAmp RGB OUT (16 pin of the IC401,
IC402 and IC403)
Display Screen : 16 monochromatic gradation patterns
WAVE FORM 13 : A/D OUT DATA
Display Screen : Monochrome pattern at every 2 lines
WAVE FORM 14 : ASIC IN DATA
(242 ~ 259 pins, 262 ~ 268 pins,
276 ~ 278 pins, 281 ~ 292 pins,
295 ~ 302 pins of the IC27)
276 ~ 278 pins, 281 ~ 292 pins,
295 ~ 302 pins of the IC27)
Display Screen : Monochrome pattern at every 2 lines
WAVE FORM 15 : ASIC OUT DATA
(156 ~ 163 pins, 166 ~ 174 pins,
177 ~ 183 pins, 191 ~ 204 pins,
207 ~ 216 pins of the IC27)
177 ~ 183 pins, 191 ~ 204 pins,
207 ~ 216 pins of the IC27)
Display Screen : Monochrome pattern at every 2 lines
WAVE FORM 16 : ASIC IN/OUT DATA
(1, 3, 4, 6, 7, 9, 10, 12, 13, 17, 18, 20, 21,
60, 61, 63, 64, 68, 69, 71, 72, 74, 75, 77,
78, 80, 81, 83, 84, 97, 98, 100 pins of
IC8, IC9 and IC10)
60, 61, 63, 64, 68, 69, 71, 72, 74, 75, 77,
78, 80, 81, 83, 84, 97, 98, 100 pins of
IC8, IC9 and IC10)
Display Screen : Monochrome pattern at every 2 lines
Display