Read Sharp LL-T1811W (serv.man4) Service Manual online
LL-T1811W
4 – 1
CHAPTER 4. WAVE FORM
Waveform measurement condition: Input each of the display patterns and measure the waveform (timing chart).
CAUTION
(1) Use the probe TektronixP6139A.
(2) Reception mode: VESA 1280
u
1024
H: 80kHz V: 75Hz DOTCLK: 135MHz
Oscilloscope : Tektronix TDS644B
Input signal
: VESA 1280
u
1024
H: 80kHz V: 75Hz
DOTCLK: 135MHz
DOTCLK: 135MHz
WAVE FORM 1 : XIN1 (21pin of the IC24)
Frequency:
24MHz
Display screen:
arbitrary
WAVE FORM 2 : XIN2 (C139 terminal side of the X2)
Frequency:
24MHz
Display screen:
arbitrary
WAVE FORM 3 : VSYNC (LD66)
Frequency:
60kHz
Display screen:
arbitrary
Wave-form
No.
Measurement point
Name of waveform
Display pattern
1
21pin of the IC24
XIN1
Arbitrary
2
C139 terminal side of the X2
XIN2
Arbitrary
3
LD66
VSYNC
Arbitrary
4
LD67
HSYNC
Arbitrary
5
FL4, FL3
LCD CLKA, CLKB
Arbitrary
6
LD23
LCD DE
Arbitrary
7
FLA~FLA12
LCD DATA
Monochrome pattern at every 2 lines
8
FLA~FLA12
LCD DATA
Monochrome pattern at every 2 lines
9
IC6 side of C161, C156, C153
RGB OUT
16 monochromatic gradation patterns
10
2, 3, 5, 6, 8, 9, 11, 12, 39, 40, 42, 43, 45,
46, 48, 49pin of IC10, 11, 12
46, 48, 49pin of IC10, 11, 12
SDRAM I/O DATA
Monochrome pattern at every 2 lines
11
2, 3, 5, 6, 8, 9, 11, 12, 39, 40, 42, 43, 45,
46, 48, 49pin of IC10, 11, 12
46, 48, 49pin of IC10, 11, 12
SDRAM I/O DATA
Monochrome pattern at every 2 lines
GND
2V/DIV, 25ns/DIV
GND
2V/DIV, 25ns/DIV
GND
2V/DIV, 25ns/DIV
Display
