Sharp LC-70UD20KN (serv.man4) Service Manual ▷ View online
65
LC-60UD20
LC-70UD20
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YES
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YES
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YES
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YES
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Check IC3301 and its peripheral circuits.
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YES
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Check IC3301 and its peripheral circuits.
Check the line between IC3301 and IC1981.
Check the setting of an external input device that connects with
EXT1.
EXT1.
Check the line between IC1901 and SC650.
Do audio signals input to pins of IC1981 ?
[1,2 / HP_MONITOR_R]
[13,14 / HP_MONITOR_L]
[1,2 / HP_MONITOR_R]
[13,14 / HP_MONITOR_L]
Check whether it is selected "Audio out" by the menu under
"TV Menu" - "Setup" - "Option" - "Terminal setting"
- "Headphone/Audio out select".
"TV Menu" - "Setup" - "Option" - "Terminal setting"
- "Headphone/Audio out select".
Check the setting of an external input device that connects with
J503.
And check the line between J503 and IC3301 (CPU)
J503.
And check the line between J503 and IC3301 (CPU)
Check IC1981 and its peripheral circuits.
Do audio signals (HP_MONITOR_L/R) output from pins of IC3301 ?
[AN34 / CPU_AL0_ADAC]
[AN35 / CPU_AR0_ADAC]
[AN34 / CPU_AL0_ADAC]
[AN35 / CPU_AR0_ADAC]
Check the line between IC1981 and J503.
No sound from external output device (2)
Is AUDIO_MUTE(MUTE_A_ALL) [5 pin] of IC1981(HP-AMP) at "L" ?
Check the line between IC1981 and SC650.
Do audio signals output from pins of IC1981 ?
[ 3 / HP_R_ANALOG_OUT]
[12 / HP_L_ANALOG_OUT ]
[ 3 / HP_R_ANALOG_OUT]
[12 / HP_L_ANALOG_OUT ]
Check between IC3301 and IC1901.
Do audio signals input to pins of IC1901 ?
[1,2 / TUNER_OUTR]
[13,14 / TUNER_OUTL]
[1,2 / TUNER_OUTR]
[13,14 / TUNER_OUTL]
Is HP_PLUG 䠷6pin䠹 of J503 at "H" ?
Check the peripheral circuits of IC2002 and AUDIO_MUTE
(Q1901 etc...)
(Q1901 etc...)
No audio signal output to EXT1 terminal.
Do audio signals output from pins of EXT1 (SC650)?
[1 / TUNER_R_OUT]
[3 / TUNER_L_OUT]
[1 / TUNER_R_OUT]
[3 / TUNER_L_OUT]
No sound from external output device (1)
No sound from HEAD PHONE_OUTPUT/ AUDIO_OUTPUT terminal.
Does not the sound of the audio signal output to Audio out
mode go out?
mode go out?
Do audio signals output from pins of J503 (HP Jack/AUDIO OUT)?
[ 2 / HP_L_ANALOG_OUT]
[ 3 / HP_R_ANALOG_OUT]
[ 2 / HP_L_ANALOG_OUT]
[ 3 / HP_R_ANALOG_OUT]
Does not the sound of the audio signal output to Headphone
mode go out?
mode go out?
Check whether it is selected "Headphone" by the menu under
"TV Menu" - "Setup" - "Option" - "Terminal setting"
- "Headphone/Audio out select".
"TV Menu" - "Setup" - "Option" - "Terminal setting"
- "Headphone/Audio out select".
Check IC1901 and its peripheral circuits.
Do audio signals output from pins of IC1901 ?
[3 / TUNER_R_OUT]
[12 / TUNER_L_OUT]
[3 / TUNER_R_OUT]
[12 / TUNER_L_OUT]
Is AUDIO_MUTE(MUTE_A_ALL) [5 pin] of IC1901 (AMP) at "L" ?
Do audio signals output from pins of IC3301 (CPU) ?
[AM34 / CPU_AL1_ADAC]
[AM32 / CPU_AR1_ADAC]
[AM34 / CPU_AL1_ADAC]
[AM32 / CPU_AR1_ADAC]
66
LC-60UD20
LC-70UD20
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YES
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YES
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Check IC3301 and its peripheral circuits.
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YES
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YES
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YES
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YES
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Check IC3301 and its peripheral circuits.
Check the line between IC3301 and D508.
Does audio signal output from pinof IC3301(CPU) ?
[Y32 / CPU_ASPDIF1]
[Y32 / CPU_ASPDIF1]
Check the line between IC3301 and IC1552.
Check IC1552 and peripheral circuits.
Does audio signal input to pin of IC1552 ?
[1 / ARC_SPDIF]
[1 / ARC_SPDIF]
No sound from DIGITAL AUDIO OUTPUT terminal.
Does audio signal output from pin of IC1552 ?
[4 / ARC_SWOUT]
[4 / ARC_SWOUT]
Check D508 and peripheral circuits.
Does audio signal output from pin of D508 ?
[1 / OPTICAL_OUT]
[1 / OPTICAL_OUT]
No sound from external output device (3)
Does audio signal (OPT_OUT) output from pin of IC3301(CPU) ?
[AR16 / CPU_ASPDIF0]
[AR16 / CPU_ASPDIF0]
Check the line between IC1552 and SC1511.
Does audio signal output from pin of SC1511 (HDMI1) ?
[14 / ARC_SWOUT]
[14 / ARC_SWOUT]
Check SC1511 and peripheral circuits.
Does not the sound of the audio signal output to HDMI1(ARC) go out?
No sound from external output device (4)
67
LC-60UD20
LC-70UD20
3.3. Picture
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NO
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YES
Refer to “No picture on the display (1)”
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Does video signal output from pins of TUNER(TU1102) ?
[6 / AIF_P_TUNER ]
[7 / AIF_N_TUNER ]
[6 / AIF_P_TUNER ]
[7 / AIF_N_TUNER ]
Does video signal input to pin of IC3301 (CPU) ?
[AU32 / CPU_TUN_IFP]
[AT32 / CPU_TUN_IFN]
[AU32 / CPU_TUN_IFP]
[AT32 / CPU_TUN_IFN]
Do TS signals output to pins of TUNER(TU1102) ?
[8 / DIF_P_TUNER]
[9 / DIF_N_TUNER ]
[8 / DIF_P_TUNER]
[9 / DIF_N_TUNER ]
Do TS signals input to pins of IC1301 (Demodulator) ?
[37 / DIF_P]
[38 / DIF_N]
[37 / DIF_P]
[38 / DIF_N]
Check the line between TU1102 and IC3301.
No picture on the display (3)
Does not the picture/sound come out when DTV is received?
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
No picture on the display (1)
The picture doesn't appear , except for HDMI1/2/3/4
Is the signal output from IC3301 (CPU) respectively?
[AT4, AU4 / VBO_TXA+, -]
[AP3, AR3 / VBO_TXB+, -]
[AT2, AU2 / VBO_TXC+, -]
[AR1, AR2 / VBO_TXD+, -]
[AT4, AU4 / VBO_TXA+, -]
[AP3, AR3 / VBO_TXB+, -]
[AT2, AU2 / VBO_TXC+, -]
[AR1, AR2 / VBO_TXD+, -]
Check IC3301 and its peripheral control circuits.
(IC2002, IC3501, IC3502, IC3503, IC3504, X3301, etc.)
(IC2002, IC3501, IC3502, IC3503, IC3504, X3301, etc.)
䞉
Check IC3301 and SC3801 and their peripheral circuits in Main Unit.
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Check the connection to FRC Unit
䞉
Check the harness.
Check the line between IC3301 and SC3801.
Do above-mentioned signals input to connector (SC3801) ?
[20,21 / VBO_TXA+, -]
[17,18 / VBO_TXB+, -]
[14,15 / VBO_TXC+, -]
[11,12 / VBO_TXD+, -]
[20,21 / VBO_TXA+, -]
[17,18 / VBO_TXB+, -]
[14,15 / VBO_TXC+, -]
[11,12 / VBO_TXD+, -]
Is the pin of SC3801 at "Low"
[40 / VBO_LOCKN]
[40 / VBO_LOCKN]
Check the TU1102 and its peripheral circuits.
Replace as required.
Replace as required.
Check the line betweenTU1102 and IC1301.
䞉
Regarding the Picture, Refer to “No picture on the display (1).”
䞉
Regarding the Sound, Refer to “No sound from the Speaker & Woofer.”
Do TS signals output to pins of IC1301 ?
[3 / TSS_YNC]
[4 / TSS_DEN]
[5 / TSS_CLK]
[8,9,12,13,14,15,16,17 / TS2_D0~7]
[3 / TSS_YNC]
[4 / TSS_DEN]
[5 / TSS_CLK]
[8,9,12,13,14,15,16,17 / TS2_D0~7]
Do TS signals input to pins of IC3301(CPU) ?
[T32 / CPU_DEMOD_TSCLK] [T31 / CPU_DEMOD_TSVAL]
[T35 / CPU_DEMOD_TSSYNC] [T36 / CPU_DEMOD_TSDATA0]
[U36 / CPU_DEMOD_TSDATA1] [T33 / CPU_DEMOD_TSDATA2]
[T30 / CPU_DEMOD_TSDATA3] [V33 /
CPU_DEMOD_TSDATA4]
[V32 / CPU DEMOD TSDATA5] [V31 /
[T32 / CPU_DEMOD_TSCLK] [T31 / CPU_DEMOD_TSVAL]
[T35 / CPU_DEMOD_TSSYNC] [T36 / CPU_DEMOD_TSDATA0]
[U36 / CPU_DEMOD_TSDATA1] [T33 / CPU_DEMOD_TSDATA2]
[T30 / CPU_DEMOD_TSDATA3] [V33 /
CPU_DEMOD_TSDATA4]
[V32 / CPU DEMOD TSDATA5] [V31 /
Check the IC1301 and its peripheral circuits.
䞉
Refer to "No picture on the display (FRC Unit)"
Check the line between IC1301 and IC3301.
Check the tuner and its peripheral circuits.
Replace as required.
Replace as required.
68
LC-60UD20
LC-70UD20
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YES
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NO
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NO
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NO
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Refer to “No picture on the display (1)”
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YES
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YES
NO
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YES
Refer to “No picture on the display (1)”
Signal input to pin of IC1102 ?
[3 / DISEQC_DEMOD_OUT]
[3 / DISEQC_DEMOD_OUT]
Does CVBS signal inputs to pin of EXT1 (SC650) ?
[20 / CVBS-IN]
[20 / CVBS-IN]
Do Y/C video signals input to pins of EXT1(SC650) ?
[20 / Y]
[15/ C ]
[20 / Y]
[15/ C ]
Does Y/C signal input to pins of IC3301 (CPU)
[AR30 / CPU_CVBS2P]
[AR28 / SC_PR0P]
[AR30 / CPU_CVBS2P]
[AR28 / SC_PR0P]
No picture on the display (4)
Does not the picture come out when DTV(Satellite) is received?
Check the TU1102 and its peripheral circuits.
Replace as required.
Replace as required.
LNB signal input to pin of TUNER(TU1102) ?
[12 / LNBOUT__13V_18V]
[12 / LNBOUT__13V_18V]
Check the line between IC1102 and TU1102.
Check the line between IC1102 and IC1301.
Check the IC1301 and its peripheral circuits.
䞉
Regarding the Picture, Refer to “No picture on the display (1).”
䞉
Regarding the Sound, Refer to “No sound from the Speaker & Woofer.”
No picture on the display (5)
Does not the picture of the CVBS signal input to EXT1 go out?
Signal output to pin of IC1102 ?
[13 / LNBOUT__13V_18V]
[13 / LNBOUT__13V_18V]
signal output to pin of IC1301 ?
[23 / DISEQC_DEMOD_OUT]
[23 / DISEQC_DEMOD_OUT]
Check the setting of an external input device that connects with
EXT1.
EXT1.
Check the line between SC650 and IC3301.
No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Check the setting of an external input device that connects with
EXT1.
EXT1.
Check the line between SC650 and IC3301.
Does CVBS signal input to pin of IC3301 (CPU)
[AR30 / CPU_CVBS2P]
[AR30 / CPU_CVBS2P]
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NO
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NO
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NO
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Refer to “No picture on the display (1)”
No picture on the display (9)
Does not the picture of the COMPONENT signal input to EXT2 go out?
Check whether it is selected "AUTO" or "COMPONENT" by the INPUT6 select under
"TV Menu" - "Setup" - "Option" - "Terminal setting" - "Input select".
"TV Menu" - "Setup" - "Option" - "Terminal setting" - "Input select".
Check the setting of an external input device that connects with J504.
Do COMPONENT signals input to pins of J504 ?
[3 / COMP1_Y]
[5 / COMP1_Pb]
[7 / COMP1_Pr]
[3 / COMP1_Y]
[5 / COMP1_Pb]
[7 / COMP1_Pr]
Is CVBS_PLUG [2/RCA_CVBS1_PLUG] of J502 at "H" ?
Is COMP_PLUG [2/RCA_COMP1_PLUG] of J504 at "L" ?
Is COMP_PLUG [2/RCA_COMP1_PLUG] of J504 at "L" ?
Check the setting of an external input device that connects with J504.
Check the line between J504 and IC3301.
Do COMPONENT signals input to pins of IC3301 (CPU) ?
[AU26 / COMP_Y1P]
[AP26 / COMP_PR1P]
[AR26 / COMP_PB1P]
[AU26 / COMP_Y1P]
[AP26 / COMP_PR1P]
[AR26 / COMP_PB1P]
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