Sharp LC-20AD5E Service Manual ▷ View online
TROUBLESHOOTING GUIDE
Is setting of color
normal?
normal?
Is the color signal
received?
received?
Change the setting of color.
Receive the color signal.
Check IC803 and peripheral
circuit.
circuit.
THE COLOR DOES NOT
APPEAR
APPEAR
Yes
No
Yes
No
E-5
TROUBLSHOOTING GUIDDE
Is there signal at pins
2, 4 of IC101?
2, 4 of IC101?
Is there color signal at
pins 83 and
84 of IC803 ?
pins 83 and
84 of IC803 ?
Check IC101 and
peripheral circuit.
peripheral circuit.
Check IC803 and peripheral
circuit.
circuit.
Change MAIN PCB.
Yes
No
Yes
No
ON SCREEN DISPLAY DOES
NOT APPEAR
NOT APPEAR
E-6
TROUBLESHOOTING GUIDE
THE SCREEN HAS A VERTICAL
LINE OR A HORIZONTAL LINE.
LINE OR A HORIZONTAL LINE.
Change V2301.
No
Yes
Change IC803.
Is there a normal
waveform at pins 184,
187 and 190 of IC803?
waveform at pins 184,
187 and 190 of IC803?
E-7
TU6002 TUNER
AGC
AGC
4
RF_AGC
SCL
9
IC6001 BUS_SW
SDA
10
15
SCL
F_SCL
1
F_SCL
14
SDA
F_SDA
13
F_SDA
CVBS
15
D_TUNER_SCL
2
D_TUNER_SCL
D_TUNER_SDA
12
D_TUNER_SDA
IF AGC
18
DIF1
19
DIF1
DIF2
20
DIF2
IF_AGC
IF_AGC
IC4201 TUNER_OUT_CVBS_SW
6 TU_TUNER_CVBS_IN
D_TUNER_CVBS_IN
4
D_TUNER_CVBS
2 OUT
J4206
SW_CVBS_(TU/D_TU)
R_OUT
1
SC1_A_OUT_R
L_OUT
3
SC1_A_OUT_L
SCART1_Y_IN
SCART1_Y_IN
L_IN
2
R_IN
6
IC4204 SCART1/2_RGB_SW
21-B_IN
7
8 SCART1_B_IN
SW_SCART_R/C_OUT
3
SW_SCART_R/C
21-G_IN
11
11 SCART1_G_IN
SW_SCART_G_OUT
5
SW_SCART_G
SCART 1
21-R_IN
15
16 SCART1_R_IN
SW_SCART_B_OUT
6
SW_SCART_B
(21-C_IN)
21-Y_IN
16
1 SCART2_R/C_IN
9 SCART2_B_IN
9 SCART2_B_IN
FOR_VCR
8
14 SCART2_G_IN
SCART1_SW
TUNER OUT
19
VIDEO IN
20
IC4203 SCART1/2_AUDIO_Lch_SW
4 SC2_A_IN_L
A_L_OUT
2
SW_A_L
R_OUT
22
SC2_A_OUT_R
(SCALER IC803 21pin)
6 SC1_A_IN_L
L_OUT
24
SC2_A_OUT_L
(SCALER IC803 22pin)
L_IN
23
IC4202 SCART1/2_AUDIO_Rch_SW
R_IN
27
4 SC2_A_IN_R
A_R_OUT
2
SW_A_R
6 SC1_A_IN_R
21-B_IN
28
21-G_IN
32
IC4206 SCART1/2_VIDEO_SW
SCART2
21-R_IN
36
4 SCART2_V_IN
V_OUT
2
SW_SCART_CVBS/Y
(21-C_IN)
6 SCART1_V_IN
21-Y_IN(FB)
37
SCART2_FB(Y_IN)
FOR_VCR
29
SCART2_SW
MONITOR OUT
40
SC2_CVBS_OUT
VIDEO IN
41
J702 AV_AUDIO_IN/S-TERMINAL_JACK
S_Y_IN
7
S_C_IN
8
S_JACK_C/ S_JACK_Y
V_IN
2
CVBS_IN
L_IN
3
VIDEO_A_L
R_IN
11
VIDEO_A_R
J4202 AUDIO _OUT_JACK
L_OUT
3
AUDIO_OUT_JACK_L
R_OUT
2
AUDIO_OUT_JACK_R
TUNER/SCART1/SCART2/RCA AUDIO OUT BLOCK DIAGRAM
SCALER/SUB
MICON
MICON
SOUND AMP/
HEADPHONEJACK/
COMPONENT
HEADPHONEJACK/
COMPONENT
SCALER/
SUB
MICON
SUB
MICON
SCALER/
SUB
MICON
SUB
MICON
F-1
F-2
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