Read Sharp LL-T1820 (serv.man9) Service Manual online
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SERVICE MANUAL
CONTENTS
Parts marked with "
!
" are important for maintaining the safety of the set. be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SHARP CORPORATION
CODE : 00ZLLT1820SME
LCD MONITOR
LL-T1820
MODEL
LL-T1820
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION . . . 1 – 1
CHAPTER 2. CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS . . . . 2 – 1
CHAPTER 3. DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . . . . . . . . . 3 – 1
CHAPTER 4. TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 1
CHAPTER 5. WAVE FORM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 – 1
CHAPTER 6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 – 1
CHAPTER 7. CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 1
CHAPTER 8. PARTS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 – 1
-B
-H
LL-T1820-H/B SERVICE PRECAUTION
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SERVICE PRECAUTION
[OVERCURRENT PROTECTION ELEMENT FOR USB OUTPUT OF THE POWER UNIT]
The USB output (5V, connector CN2) of the power unit is provided with an overcurrent protection element (Part Number PTC101) of PTC (positive
characteristics thermister). Its resistance becomes high when heated by an overcurrent, and shuts down the circuit similarly with a fuse. When it is
cooled down by non-conduction, its resistance returns to a low level and allows a current to flow through the circuit.
cooled down by non-conduction, its resistance returns to a low level and allows a current to flow through the circuit.
If a user erroneously allows an overcurrent to flow through an USB device, the PTC101 cuts off the current. When repaired, it returns to normal. Note
this operation of the PTC 101 in case of an USB error.
PC-UM10M
LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 1
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1. SPECIFICATIONS
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PRODUCT SPECIFICATIONS
• LCD display
18.1 inches (46 cm measured diagonally)
Advanced-Super-V and Anti Glare Low Reflection TFT LCD module
• Resolution (max.)
SXGA 1280
u
1024 pixels
• Displayable colors (max.)
16.77 million colors (8 bit)
• Brightness (max.)
220cd/m
2
• Dot pitch
0.2805(H) 0.2805(V) mm
• Contrast ratio
400 : 1
• Angle of visibility
Left-right 170°
; Up-down 170°
• Screen display size
Horizontal 359 mm
u
Vertical 287.2 mm
• Video signal
Analog: Analog RGB (0.7Vp-p) [75
Ω
]
Digital: DVI standard based on 1.0
• Sync signal
Separate Sync (TTL level: +/-), Sync on Green,
Composite Sync (TTL level: +/-)
Composite Sync (TTL level: +/-)
• Expansion compensation
Digital screening (enlargement of display to correct VGA/SVGA/XGA)
[1:1, expansion (fixed aspect ratio), expansion (total screen surface)]
[1:1, expansion (fixed aspect ratio), expansion (total screen surface)]
• Plug & Play
VESA: DDC2B compatible
• Power management
VESA: based on DPMS
DVI:
based on DMPM
• Input signal terminal
Digital / Analog:29 pin DVI-I
u
2
• USB hub function
1 upstream port, 2 downstream ports
(bus-powered hub based on USB standard Rev 1.1)
• Screen tilt
Upward 0° - 30°
; downward 0° - 5°
• Screen swivel
90° from left through right
• Power supply
AC100-240V, 50/60Hz (Use special AC adapter, type NL-A03E of
Sharp Corporation.)
• Temperature of operating environment
5 - 35°C
• Power consumption
Maximum 57W (2.9W when in power-saving mode)
(Use special AC adapter.)
• Dimensions (W
u
D
u
H)
395 mm
u
213 mm
u
427 mm
• Weight (excluding AC adapter)
Approx. 8.9 kg, Display area only, approx. 5.7kg
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DIMENSIONS (Units: mm)
Special AC adapter
Option
Digital signal cable:
Approx. 2.0 m
Analogue signal cable: Approx. 2.0 m
USB cable:
Approx. 1.8 m
395
213
427
324
507
324
463
395
543
277
Approx. 2.0 m
Approx. W 120 mm
u
D 60 mm
u
H 35 mm
PC-UM10M
LL-T1820-H/B OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION
1 – 2
Relevant signal timings (analog)
• Recommended resolution is 1280
u
1024.
• All are compliant only with non-interlaced.
• Frequencies for Power Macintosh and the Sun Ultra series are refer-
ence values. To connect, another adapter (purchased separately)
may be required.
• If the monitor is receiving timing signals that are not compatible, [OUT
OF TIMING] will appear. Follow your computer's instruction manual
to set the timing so that it is compatible with the monitor.
to set the timing so that it is compatible with the monitor.
• If the monitor is not receiving any signal (synch signal), [NO SIGNAL]
will appear.
Relevant signal timings (digital)
• Recommended resolution is 1280
u
1024.
• All are compliant only with non-interlaced.
• A computer with an output terminal conforming to DVI (DVI-D24 pin
or DVI-I29 pin) and with SXGA output capability can be connected
here.
(Depending on the type of computer to be connected, the display may
not work correctly.)
not work correctly.)
• If the monitor is receiving timing signals that are not compatible, [OUT
OF TIMING] will appear. Follow your computer's instruction manual
to set the timing so that it is compatible with the monitor.
• If the monitor is not receiving any signal (synch signal), [NO SIGNAL]
will appear.
The DVI-I input connector pin
Display mode
Hsync
(kHz)
Vsync
(Hz)
Dot frequency
(MHz)
VESA
640
u
480
31.5kHz
60Hz
25.175MHz
37.9kHz
72Hz
31.5MHz
37.5kHz
75Hz
31.5MHz
800
u
600
35.1kHz
56Hz
36.0MHz
37.9kHz
60Hz
40.0MHz
48.1kHz
72Hz
50.0MHz
46.9kHz
75Hz
49.5MHz
1024
u
768
48.4kHz
60Hz
65.0MHz
56.5kHz
70Hz
75.0MHz
60.0kHz
75Hz
78.75MHz
1152
u
864
67.5kHz
75Hz
108.0MHz
1280
u
960
60.0kHz
60Hz
108.0MHz
1280
u
1024
64.0kHz
60Hz
108.0MHz
80.0kHz
75Hz
135.0MHz
US text
720
u
400
31.5kHz
70Hz
28.3MHz
Power
Macintosh
series
Macintosh
series
640
u
480
35.0kHz
66.7Hz
30.2MHz
832
u
624
49.7kHz
74.6Hz
57.3MHz
1024
u
768
60.2kHz
75Hz
80.0MHz
1152
u
870
68.7kHz
75Hz
100.0MHz
1280
u
1024
64.0kHz
60Hz
108.0MHz
80.0kHz
75Hz
135.0MHz
Sun Ultra
series
series
1024
u
768
48.3kHz
60Hz
64.13MHz
53.6kHz
66Hz
70.4MHz
56.6kHz
70Hz
74.25MHz
1152
u
900
61.8kHz
66Hz
94.88MHz
71.8kHz
76.2Hz
108.23MHz
1280
u
1024
71.7kHz
67.2Hz
117.01MHz
81.1kHz
76Hz
134.99MHz
Display mode
Hsync
(kHz)
Vsync
(Hz)
Dot frequency
(MHz)
VESA
640
u
480
31.5kHz
60Hz
25.175MH
37.9kHz
72Hz
31.5MHz
37.5kHz
75Hz
31.5MHz
800
u
600
37.9kHz
60Hz
40.0MHz
48.1kHz
72Hz
50.0MHz
46.9kHz
75Hz
49.5MHz
1024
u
768
48.4kHz
60Hz
65.0MHz
56.5kHz
70Hz
75.0MHz
60.0kHz
75Hz
78.75MHz
1152
u
864
67.5kHz
75Hz
108.0MHz
1280
u
960
60.0kHz
60Hz
108.0MHz
1280
u
1024
64.0kHz
60Hz
108.0MHz
US text
720
u
400
31.5kHz
70Hz
28.3MHz
No.
Function
No.
Function
1
TMDS data 2-
16
Hot plug detection
2
TMDS data 2+
17
TMDS data 0-
3
TMDS data 2/4 shield
18
TMDS data 0+
4
N.C.
19
TMDS data 0/5 shield
5
N.C.
20
N.C.
6
DDC clock
21
N.C.
7
DDC data
22
TMDS clock shield
8
Analogue vertically
synchronised signal
synchronised signal
23
TMDS clock +
9
TMDS data 1-
24
TMDS clock -
10
TMDS data 1+
C1
Analogue red image signal
11
TMDS data 1/3 shield
C2
Analogue green image signal
12
N.C.
C3
Analogue blue image signal
13
N.C.
C4
Analogue horizontally
synchronised signal
synchronised signal
14
+5V
C5
Analogue GND
15
GND
