Sharp LL-T15S1 (serv.man9) Service Manual ▷ View online
[4] DISASSEMBLING THE REAR PANEL
1. Figure A: Remove the 6 screws
and connector
. Remove
the I/F board cover.
Remove the 4 screws
and 6 connectors
. Remove
the I/F board.
Figure B: Remove the 2 screws
and remove the connectors
and
. Remove the Phone Jack PWB and Sensor
PWB.
Figure C: Remove the 2 screws
and remove the inverter PWB.
[5] REMOVING LCD MODULE
1. Remove the 2 screws
and remove the LCD connection PWB.
C
B
A
1
1
2
A
3
3
3
4
4
4
B
C
2
3
1
1
1
1
CHAPTER 4. BLOCK DIAGRAM
TERMINALS
LCD SIGNAL INPUT
Used connector : FX8-60P-SV (HIROSE)
Pin No.
Symbol
Function
1
GND
GND
2
RB0
RED Even pixel data signal
(LSB)
3
RB1
RED
4
RB2
RED
5
RB3
RED
6
RB4
RED
7
RB5
RED
(MSB)
8
GND
GND
9
GB0
GREEN Even pixel data signal
(LSB)
10
GB1
GREEN
11
GB2
GREEN
12
GB3
GREEN
13
GB4
GREEN
14
GB5
GREEN
(MSB)
15
GND
GND
16
BB0
BLUE Even pixel data signal
(LSB)
17
BB1
BLUE
18
BB2
BLUE
Pin No.
Symbol
Function
19
BB3
BLUE
20
BB4
BLUE
21
BB5
BLUE
(MSB)
22
GND
GND
23
RA0
RED Odd pixel data signal
(LSB)
24
RA1
RED
25
RA2
RED
26
RA3
RED
27
RA4
RED
28
RA5
RED
(MSB)
29
GND
GND
30
GA0
GREEN Odd pixel data signal
(LSB)
31
GA1
GREEN
32
GA2
GREEN
33
GA3
GREEN
34
GA4
GREEN
35
GA5
GREEN
(MSB)
36
GND
GND
2.5W Speaker*2
D-SUB 15
Pin cable
Earphone OUT, M IC IN
Phone jack
BD
Power Jack
BD
12V IN, Audio IN, MIC OUT
AC
INPUT
Power
Adaptor
12V OUT
Key control
BD
Sensor
BD
Interface
BD
WIRE BD
Inverter
BD (2 CCFL)
LCD
PA NEL
(DH10)
Pin No.
Symbol
Function
37
BA0
BLUE Odd pixel data signal
(LSB)
38
BA1
BLUE
39
BA2
BLUE
40
BA3
BLUE
41
BA4
BLUE
42
BA5
BLUE
(MSB)
43
GND
GND
44
REV1
(GND)
45
GND
GND
46
V
sync
Vertical synchronizing signal
47
H
sync
Horizontal synchronizing signal
48
DE
Data enable signal (Display position signal)
49
GND
GND
50
GND
GND
51
CKB
Sampling clock
52
CKA
Sampling clock
53
GND
GND
54
GND
GND
55
GND
GND
(GND)
56
MODE
Timing signal select
57
Vcc
+5V power supply
58
Vcc
+5V power supply
59
Vcc
+5V power supply
60
Vcc
+5V power supply
JP5 (To Inverter Terminal)
Used connector : PH_5
Pin No.
Symbol
Function
1
ON / OFF
HIGH = ON
2
GND
GND
3
BRIGHT
Brightness control of inverter +5V
4
GND
GND
5
+12V
+12V IN
JP2 (To Key Switch Board Terminal)
Used connector : PH_9P
Pin No.
Symbol
Function
1
KEY MENU
MENU
2
KEY SELECT SELECT
3
KEY UP
UP
4
KEY DOWN
DOWN
5
HOT KEY
HOT KEY
6
SOFT PWA
SOFT POWER
7
GND
GND
8
LED AMBER
LED ORANGE
9
LED GREEN
LED GREEN
PH-6 (Power Supply Input Terminal) FROM
POWER JACK BD
Used connector : CON 4P
Pin No.
Symbol
Function
1
+12V
+12V supply from power BD
2
+12V
+12V supply from power BD
3
GND
GND
4
GND
GND
5
+5V
NC
6
+5V
NC
JP2 (Power Supply Input Terminal From AC ADAPTER)
Used connector : POWER_JACK20_B
Pin No.
Symbol
Function
1
GND
2
+12V
+12V supply from AC ADAPTER
3
GND
J1(Signal Input Terminal)
Used connector : PH12P
Pin No.
Symbol
Function
1
SCL
DDC
2
SDA
DDC
3
DDC +5V
DDC
4
V-SYNC-
V-SYNC
5
H-SYNC
H-SYNC
6
GND
GND
7
BLUE
BLUE
8
GND
GND
9
GREEN
GREEN
10
GND
GND
11
RED
RED
12
GND
GND
JP4 (From BRIGHT SENSER) (Only 15UA)
Used connector : HEADER_4
Pin No.
Symbol
Function
1
+5V
+5V
2
AUTO BRI DETECT Auto Bright Detect
3
AUTO BRI CTRL
Auto Bright Control
4
GND
GND
JP7 (From DC JACK BD)
Pin No.
Symbol
Function
1
AUDIO_IN_L
Audio In Left
2
GND
GND
3
GND
GND
4
AUDIO_IN_R
Audio In Right
5
EAR_PHONE_R+
Ear Phone Right+
6
EAR_PHONE_R-
Ear Phone Right-
7
EAR_PHONE_L-
Ear Phone Left-
8
EAR_PHONE_L+
Ear Phone Left+
JP6 (To SPEAKER UNIT)
Pin No.
Symbol
Function
1
SPK_R-
Speaker Right-
2
SPK_R+
Speaker Right+
3
SPK_L-
Speaker Left+
4
SPK_L+
Speaker Left-
CHAPTER 5. TROUBLESHOOTING
No power supply
Does LED turns on in green
when power switch is turned
on?
when power switch is turned
on?
No
No
No
No
No
No
LED turns on in red?
Yes
Yes
Yes
Yes
Yes
* Check LED for breakage.
* Check the path between JP2 (9pin) and
* Check the path between JP2 (9pin) and
U11(27pin).
* Check cable for disconnection.
Replace any unit (main PWB, SW PWB, cable
Power jack) which shows any defect, with a new
Power jack) which shows any defect, with a new
1) PC is turned off?
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB
cable?
Check whether the unit is in power save
mode (synchronizing signal is not input.).
mode (synchronizing signal is not input.).
Synchronizing signal is input to main PWB?
Replace RGB cable
with a new one.
with a new one.
LED turns on in orange?
Check power input system.
1) AC adapter
* Normal?
* Connected properly?
2) Blown out fuse (F1) or power jack PWB?
3) EEPROM (U11) has +5V (VCC)?
4) LED
* Check LED for breakage.
* Check the path between JP2 (9pin)
* Normal?
* Connected properly?
2) Blown out fuse (F1) or power jack PWB?
3) EEPROM (U11) has +5V (VCC)?
4) LED
* Check LED for breakage.
* Check the path between JP2 (9pin)
and U11 (27pin).
* Check the cable for disconnection.
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB, 4) Power jack PWB] with a new one.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB, 4) Power jack PWB] with a new one.
Backlight turns ON?
Check for RGB cable input
signal.
signal.
Replace RGB cable.
Check each pin terminal
of JP5.
of JP5.
Normal
Normal
Normal
Defective
Defective
Check output circuit to JP5.
1) If +12V is NG, replace main
1) If +12V is NG, replace main
PWB.
* Check inverter PWB unit.
Note: Use caution when checking output
Note: Use caution when checking output
side because it has a high voltage.
(1400 Vrms when starting)
(1400 Vrms when starting)
Replace LCD module lamp with
a new one.
a new one.
Replace inverter PWB
unit with a new one.
unit with a new one.
A
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