Sharp LC-24LS240EXK (serv.man2) Service Manual ▷ View online
61
LC-24LS240
2S7SYRH4VSFPIQEX,IEHTLSRI
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8. No Sound Problem at Headphone
Problem: No audio at headphone output.
Check HP detect pin, when headphone is connected. Check 5V_VCC and 3V3_VCC with a voltage
meter.
Problem: No audio at headphone output.
Check HP detect pin, when headphone is connected. Check 5V_VCC and 3V3_VCC with a voltage
meter.
7. No Sound Problem
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC and 3V3_VCC with a voltage-meter. There may
be a problem in headphone connector or headphone detect circuit (when headphone is connected,
speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3V.
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC and 3V3_VCC with a voltage-meter. There may
be a problem in headphone connector or headphone detect circuit (when headphone is connected,
speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3V.
62
LC-24LS240
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC
with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW.
Additionally it is good to check SW printouts via hyper-terminal (or Teraterm).
These printouts may give a clue about the problem.
with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW.
Additionally it is good to check SW printouts via hyper-terminal (or Teraterm).
These printouts may give a clue about the problem.
9. Standby On/Off Problem
Problem: Device cannot boot, TV hangs in standby mode
Problem: Device cannot boot, TV hangs in standby mode
10.
No signal Problem
Problem: No signal in TV mode.
Check tuner supply voltage; 3V3_TUN. Check tuner options are corretly set in Service menu. Check
AGC voltage at IF_AGC pin of tuner.
AGC voltage at IF_AGC pin of tuner.
63
LC-24LS240
OVERALL WIRING DIAGRAM
S
DC CABLE
AC
POWER
PLUG
FFC INVERTER
CABLE
LVDS CABLE
BOARD TO BOARD
SOCKETS
LED/IR CABLE
SPEAKER CABLE
SOCKET
ROCKER
SWITCH
SWITCH
S
S
64
LC-24LS240
SCHEMATIC
DIAGRAMS
Tuner & T2 Demodulator Diagram
4k7
R16
12
5V_VCC
BC848B
Q172
ANT_CTRL
FDN336P
Q175
10k
R1590
3V3_S2_TUN
R1581
1k
10k
R1595
16V
C29 10nF
S2_AGC
12V_VCC
1k
R31
10nF
16V
C25
R22
10k
R1593
10k
F1
60R
TSMISYNC
TSMICLK
3V3_S2_VDDD
SUT-RE216
TU3
5
4
3
2
1
6
7
8
9
IF_AGC
IF_P
IF_N
RESET
ANT-DC
+3V3
SCL
SDA
GND
R32
1k
C26
16V
10nF
3V3_S2_TUN
S2_QP
S2_QN
S2_IN
S2_IP
3V3_S2_TUN
C24
50V
27pF
M88DS3002
U3
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
NC5
GPO
VCC_10
NC4
NC3
VDDD_4
NC2
NC1
NC9
NC8
LOCK
VCC_9
LNB_EN
CKXTAL_13
OLF
GNDD
M_CKOUT
M_SYNC
VCC_8
M_VAL
M_ERR
M_DATA7
M_DATA6
VDDD_3
M_DATA5
M_DATA4
VCC_7
M_DATA3
M_DATA2
M_DATA1
M_DATA0
VCC_6
AAGC
SCLT
SDAT
VCC_3
SDA
SCL
VDDD_2
ADDR_SEL1
ADDR_SEL0
VCC_4
VSEL
DISEQC_IN
DISEQC
VCC_5
CKXTAL_27
RESET
GNDA_1
XTAL_IN
XTAL_OUT
VDDA_1
GNDA_2
IP
IN
VDDA_2
GNDA_3
QN
QP
NC6
VDDD_1
VCC_1
VCC_2
NC7
LNB_OUT
1nF
C16
50V
50V
C17
1nF
50V
C18
1nF
1V25_S2_VDDI
3V3_S2_TUN
R1594
10k
27MHz
X1
3
1
4
2
50V
C23
27pF
OVER_CUR_DETECT
3V3_S2_VDDA
3V3_S2_TUN
3k3
R39
C27
16V
10nF
S5
1
2
S11
1
2
C965
16V
100nF
47R
R27
R28
47R
S12
12
1V2_VCC
F2
60R
S20
12
3V3_VCC
F3
60R
3V3_VCC
10nF
16V
C28
100nF10V
C44
10V
C45 100nF
SDA_S2_TUN
R35
33R
33R
R36
SCL_S2_TUN
S2_IP
20k
R1586
C21
50V
27pF
27pF
50V
C22
3V3_S2_TUN
3V3_S2_TUN
M88TS2022
U4
28
27
26
25
24
23
22
21
20
19
18
17
16
15
8
9
10
11
12
13
14
1
2
3
4
5
6
7
VDDA2
CK_OUT
IP
IN
VDDA1
QN
QP
VDDA4
TEST1
TEST2
TEST3
VDDA3
XTALN
XTALP
RES
CAP
CKDIV_OPT
RFBYPASS
RESET
LNA_IN
TEST
VDAA5
VDD_DIG
SDA
SCL
VDD_REG
AGC
VDDA6
S138
1
2
2R1
TH1
CN17
S25
1
2
50V
C62
2p2F
C63
2p2F
50V
33pF
C35
50V
50V
1nF
C19
10k R4
L1
4n7H
IF_AGC_TUNER
47R
R1583
1
2
3
4
5
6
7
8
R4
R1
R3
R2
TS_MDI3
TS_MDI2
TS_MDI1
TS_MDI4
TS_MDI5
TS_MDI6
TS_MDI7
3V3_S2_VDDA
10pF
C8
10pF
C9
S2_IN
C30
16V
10nF
10nF
C31
16V
C32 10nF
16V
S2_QN
10pF
C10
C11
10pF
S2_QP
3V3_S2_VDDD
10V
C38
100nF
1V25_S2_VDDI
1V25_S2_VDDI
3V3_S2_VDDA
10V
C36 100nF
100nF
C37
10V
SDA_S2_TUN
SCL_S2_TUN
R13
4k7
12
4k7
R14
12
3V3_S2_VDDD
C910
10V
100nF
1
2
TS_MDI0
100nF
C912
10V
1
2
R1584
47R
1
2
3
4
5
6
7
8
R4
R1
R3
R2
10k
R1597
IF_AGC_MST
C20
50V
1nF
27-10-2011_08:56
TUNER&S2_TUNER&DEMOD
8
Ulas Dereli
17mb62-2v3
8
7
6
5
4
3
2
1
A
B
C
D
E
F
AX M
1
2
3
4
5
6
7
8
A
B
C
D
E
F
A3
PROJECT NAME :
VESTEL
SCH NAME :
DRAWN BY :
DRAWN BY :
T. SHT:
S41
S40
TP47
1
TP48
1
TUN_SCL
R29
47R
TUN_SDA
TUN_SDA
33pF
C34
50V
TUN_SCL
ACTIVE_ANT_SUPPLY
C904
100nF
10V
1
2
TUN_SCL_MST
10V
100nF
C52
C53 100nF10V
C54
10V
100nF
10V
C55 100nF
100nF10V
C56
10V
100nF
C57
47R
R30
60R
F4
3V3_VCC
1k
F304
D206
C5V6
TUN_SDA_MST
3V3_S2_TUN
16V
22uF
C60
3V3_S2_VDDD
FK1601
TU1
5
4
3
2
1
6
7
8
9
IF_AGC
IF_P
IF_N
CLK_OUT
ANT-DC
VCC
SCL
SDA
GND
ACTIVE_ANT_SUPPLY
C61
6V3
22uF
C58
22uF
6V3
22uF
6V3
C59
3V3_TUNER
DIGITAL_IF_N
DIGITAL_IF_P
IF_AGC_TUNER
27MHz
X3
3
14
2
100R
R1963
1
2
10nF
C33
16V
18pF
C72
50V
S2_AGC
R44
2k
R15
4k7
12
3V3_TUNER
IF_AGC_TUNER
3V3_S2_VDDD
TSMIVALID
DIGITAL_IF_P
DIGITAL_IF_N
SDA_SYS
SCL_SYS
50V
18pF
C73
33R
R37
33R
R38
100nF10V
C39
C40
10V
100nF
3V3_S2_VDDD
C46
10V
100nF
10V
C47 100nF
1V25_S2_VDDI
DISEQC_OUT
10V
C48 100nF
100nF10V
C49
1V25_S2_VDDI
ACTIVE_ANT_SUPPLY
RESET_S2
C50 100nF10V
1V25_S2_VDDI
1V25_S2_VDDI
1V25_S2_VDDI
3V3_S2_VDDD
47R
R26
1V25_S2_VDDI
50V
12pF
C71
1V25_S2_VDDI
3V3_S2_VDDD
1V25_S2_VDDI
10V
C41 100nF
10V
C42 100nF
100nF10V
C43
RESET_TUNER
SONY TUNER
NC
NUTUNE/SEMCO/LG
NC
NC
0.5pF
3.3pF
27 MHZ KULLANILACAK
NC
NC
NC
NC
NC
00 SEÇILDI WRITE:D0H READ:D1H
KONTROL EDILECEK
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
I
H
G
F
E
D
C
B
A
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