Sharp LC-70UD20KN (serv.man4) Service Manual ▷ View online
69
LC-60UD20
LC-70UD20
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Refer to “No picture on the display (1)”
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Refer to “No picture on the display (1)”
No picture on the display (8)
Does not the picture of the CVBS signal input to EXT2 go out?
Check whether it is selected "AUTO" or "VIDEO" 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 J502.
Check the setting of an external input device that connects with J502.
Check the line between J502 and IC3301.
No picture on the display (9)
Does not the picture of the COMPONENT signal input to EXT2 go out?
Does CVBS signal input to pin of J502 ?
[3 / RCA_CVBS1]
[3 / RCA_CVBS1]
Does CVBS signal input to pin of IC3301 (CPU) ?
[AR31 / CPU_CVBS1P]
[AR31 / CPU_CVBS1P]
Is CVBS_PLUG of J502 at "L" ?
[2 / RCA_CVBS1_PLUG]
[2 / RCA_CVBS1_PLUG]
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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YES
NO
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NO
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YES
Refer to “No picture on the display (1)”
Do ANALOG-RGB and synchronized signal input to pin of PC_IN
(SC501) ?
[1 / PC_RED]
[2 / PC_GREEN]
[3 / PC_BLU]
[13 / PC_HSYNC]
[14 / PC VSYNC]
(SC501) ?
[1 / PC_RED]
[2 / PC_GREEN]
[3 / PC_BLU]
[13 / PC_HSYNC]
[14 / PC VSYNC]
Check the connection and setup with the external PC_IN devices.
Do ANALOG-RGB and synchronized signal input to pins of IC3301
(CPU) ?
[AR25 / PC_RP]
[AR24 / PC_GP]
[AU24 / PC_BP]
[AN25 / PC_HSYNC]
[AM25 / PC VSYNC]
(CPU) ?
[AR25 / PC_RP]
[AR24 / PC_GP]
[AU24 / PC_BP]
[AN25 / PC_HSYNC]
[AM25 / PC VSYNC]
No picture on the display (10)
Does not the picture of the ANALOG-RGB signal input to PC_IN (15pin-D-SUB terminal) go out?
Check the line between SC501 and IC3301.
70
LC-60UD20
LC-70UD20
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NO
Refer to “No picture on the display (15)”
Does the DDC5V signal outputs from pin of SC1515 ?
SC1515 : [18 / HDMI3_PWR5V]
SC1515 : [18 / HDMI3_PWR5V]
Does the HOT PLUG detectionof the HDMI-1(SC1511) work normal
?
?
Does the HOT PLUG detectionof the HDMI-2(SC1513) work normal
?
Does the HOT PLUG detectionof the HDMI-3(SC1515) work normal
?
?
Does the HOT PLUG detectionof the HDMI-3(SC1515) work normal
?
No picture on the display (11)
Are pins of IC2601 accessed to pins of a SC1515 by IC2, to read the
DDC-I2C SCL/SDA data.
SC1515 : [15 / HDMI3_SCL] [16 / HDMI3_SDA]
IC2601 : [77 / HDMI3_SCL] [76 / HDMI3_SDA]
DDC-I2C SCL/SDA data.
SC1515 : [15 / HDMI3_SCL] [16 / HDMI3_SDA]
IC2601 : [77 / HDMI3_SCL] [76 / HDMI3_SDA]
Are pins of IC2601 accessed to pins of a SC1513 by IC2, to read the
DDC-I2C SCL/SDA data.
SC1513 : [15 / HDMI2_SCL] [16 / HDMI2_SDA]
IC2601 : [79 / HDMI2_SCL] [78 / HDMI2_SDA]
DDC-I2C SCL/SDA data.
SC1513 : [15 / HDMI2_SCL] [16 / HDMI2_SDA]
IC2601 : [79 / HDMI2_SCL] [78 / HDMI2_SDA]
Do TMDS signals input to pins of IC2601 ?
[96,97 / TMDS1_CLK-,+]
[99,100 / TMDS1_D0-,+]
[102,103 / TMDS1_D1-,+]
[104,105 / TMDS1_D2-,+]
[96,97 / TMDS1_CLK-,+]
[99,100 / TMDS1_D0-,+]
[102,103 / TMDS1_D1-,+]
[104,105 / TMDS1_D2-,+]
Check the line between SC1513 and IC2601.
Check the line between SC1515 and IC2601.
Do TMDS signals input to pins of IC2601 ?
[57,58 / TMDS3_CLK-,+]
[60,61 / TMDS3_D0-,+]
[63,64 / TMDS3_D1-,+]
[65,66 / TMDS3_D2-,+]
[57,58 / TMDS3_CLK-,+]
[60,61 / TMDS3_D0-,+]
[63,64 / TMDS3_D1-,+]
[65,66 / TMDS3_D2-,+]
Check the line between SC1511 and IC2601.
Are pins of IC2601 accessed to pins of a SC1511 by IC2, to read the
DDC-I2C SCL/SDA data.
SC1511 : [15 / HDMI1_SCL] [16 / HDMI1_SDA]
IC2601 : [81 / HDMI1_SCL] [80 / HDMI1_SDA]
DDC-I2C SCL/SDA data.
SC1511 : [15 / HDMI1_SCL] [16 / HDMI1_SDA]
IC2601 : [81 / HDMI1_SCL] [80 / HDMI1_SDA]
Does not the picture/sound of the HDMI signal input to HDMI-1/2/3 go out?
Check SC1511 and its peripheral circuits(Q1515).
Check SC1513 and its peripheral circuits(Q1516).
Check SC1515 and its peripheral circuits(Q1517).
Check SC1511 and its peripheral circuits(Q1515).
Check SC1513 and its peripheral circuits(Q1516).
Does the DDC5V signal outputs from pin of SC1511 ?
SC1511 : [18 / HDMI1_PWR5V]
SC1511 : [18 / HDMI1_PWR5V]
Does the DDC5V signal outputs from pin of SC1513 ?
SC1513 : [18 / HDMI2_PWR5V]
SC1513 : [18 / HDMI2_PWR5V]
Check SC1515 and its peripheral circuits(Q1517).
Check the I2C line between SC1511 and IC2601.
Check the I2C line between SC1513 and IC2601.
Check the I2C line between SC1515 and IC2601
In the case that the input is 4K UHD signal ?
Refer to “No picture on the display (14)”
Do TMDS signals input to pins of IC2601 ?
[86,87 / TMDS2_CLK-,+]
[89,90 / TMDS2_D0-,+]
[92,93 / TMDS2_D1-,+]
[94,95 / TMDS2_D2-,+]
[86,87 / TMDS2_CLK-,+]
[89,90 / TMDS2_D0-,+]
[92,93 / TMDS2_D1-,+]
[94,95 / TMDS2_D2-,+]
SC1511: [19 / HDMI1_HPD]
SC1513: [19 / HDMI2_HPD]
SC1515: [19 / HDMI3_HPD]
71
LC-60UD20
LC-70UD20
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YES
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Refer to “No picture on the display (15)”
Check the line between SC1514 and IC2501.
Does the VBUS signal outputs from pin of SC1514?
Does the VBUS signal isnputs to pin of IC2002 (ucon) ?
SC1514 : [18 / N_MHL_VBUS_DET]
IC2002 : [53 / N_MHL_VBUS_DET]
Does the VBUS signal isnputs to pin of IC2002 (ucon) ?
SC1514 : [18 / N_MHL_VBUS_DET]
IC2002 : [53 / N_MHL_VBUS_DET]
Does the CBUS signal outputs from pin of IC2501 ?
Does the CBUS signal inputs to pin of SC1514?
SC1514 : [19 / HDMI4_HPD_CBUS]
IC2501 : [04 / HDMI4_HPD_CBUS]
Does the CBUS signal inputs to pin of SC1514?
SC1514 : [19 / HDMI4_HPD_CBUS]
IC2501 : [04 / HDMI4_HPD_CBUS]
Does not the picture/sound of the HDMI signal input to HDMI-4 go out?
Do TMDS signals output from pins of IC2501 respectively.
[47,46 / TMDS_ROGUE_OUT__CLK-,+]
[45,44 / TMDS_ROGUE_OUT__D0-,+]
[43,42 / TMDS_ROGUE_OUT__D1-,+]
[41,40 / TMDS_ROGUE_OUT__D2-,+]
[47,46 / TMDS_ROGUE_OUT__CLK-,+]
[45,44 / TMDS_ROGUE_OUT__D0-,+]
[43,42 / TMDS_ROGUE_OUT__D1-,+]
[41,40 / TMDS_ROGUE_OUT__D2-,+]
Do TMDS signals input to pins of IC2501 ?
[7,8 / TMDS_ROGUE_IN_CLK-,+]
[11,12 / TMDS_ROGUE_IN_D0-,+]
[13,14 / TMDS_ROGUE_IN_D1-,+]
[15,16 / TMDS_ROGUE_IN_D2-,+]
[7,8 / TMDS_ROGUE_IN_CLK-,+]
[11,12 / TMDS_ROGUE_IN_D0-,+]
[13,14 / TMDS_ROGUE_IN_D1-,+]
[15,16 / TMDS_ROGUE_IN_D2-,+]
Check the line between SC1514 and IC2501.
Check the IC2 line between SC1514 and IC2501.
Do TMDS signals input to pins of IC2601 ?
[47,48 / TMDS_ROGUE_OUT_CLK-,+]
[50,51 / TMDS_ROGUE_OUT_D0-,+]
[53,54 / TMDS_ROGUE_OUT_D1-,+]
[55,56 / TMDS_ROGUE_OUT_D2-,+]
[47,48 / TMDS_ROGUE_OUT_CLK-,+]
[50,51 / TMDS_ROGUE_OUT_D0-,+]
[53,54 / TMDS_ROGUE_OUT_D1-,+]
[55,56 / TMDS_ROGUE_OUT_D2-,+]
Are pins of IC2501 accessed to pins of a SC1514 by IC2, to read the
DDC-I2C SCL/SDA data.
SC1514 : [15 / HDMI4_SCL] [16 / HDMI4_SDA]
IC2501 : [75 / HDMI4_SCL] [76 / HDMI4_SDA]
DDC-I2C SCL/SDA data.
SC1514 : [15 / HDMI4_SCL] [16 / HDMI4_SDA]
IC2501 : [75 / HDMI4_SCL] [76 / HDMI4_SDA]
No picture on the display (12)
Are pins of IC2601 accessed to pins of IC2501 by IC2 ?
IC2601 : [75 / ROGUE_OUT_SCL] [76 / ROGUE_OUT_SDA]
IC2501 : [66 / ROGUE_OUT_SCL] [67 / ROGUE_OUT_SDA]
IC2601 : [75 / ROGUE_OUT_SCL] [76 / ROGUE_OUT_SDA]
IC2501 : [66 / ROGUE_OUT_SCL] [67 / ROGUE_OUT_SDA]
Check the IC2501 and peripheral circuits.
Check the line between IC2601 and IC2501.
Check the I2C line between IC2601 and IC2501.
Check the line between SC1514 and IC2002.
In the case that the input is 4K UHD signal ?
Refer to “No picture on the display (14)”
72
LC-60UD20
LC-70UD20
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Does the MHL Cable detection function?
NO
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YES
NO
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YES
NO
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NO
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YES
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YES
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YES
Refer to “No picture on the display (14)”
Check the line between SC1514 and IC2501.
Does the CD_SENSE signal outputs from pin of SC1514 at "H" ?
Does the CD_SENSE signal inputs to pin of IC2501(HDCP2.2) at
"H"
SC1514 : [2 / MHL_CABLE_SENCE]
Does the CD_SENSE signal inputs to pin of IC2501(HDCP2.2) at
"H"
SC1514 : [2 / MHL_CABLE_SENCE]
Do TMDS signals output from pins of IC2501 respectively.
[47,46 / TMDS_ROGUE_OUT__CLK-,+]
[45,44 / TMDS_ROGUE_OUT__D0-,+]
[43,42 / TMDS_ROGUE_OUT__D1-,+]
[41,40 / TMDS_ROGUE_OUT__D2-,+]
[47,46 / TMDS_ROGUE_OUT__CLK-,+]
[45,44 / TMDS_ROGUE_OUT__D0-,+]
[43,42 / TMDS_ROGUE_OUT__D1-,+]
[41,40 / TMDS_ROGUE_OUT__D2-,+]
Do TMDS signals input to pins of IC2501 ?
[7,8 / TMDS_ROGUE_IN_CLK-,+]
[11,12 / TMDS_ROGUE_IN_D0-,+]
[13,14 / TMDS_ROGUE_IN_D1-,+]
[15,16 / TMDS_ROGUE_IN_D2-,+]
[7,8 / TMDS_ROGUE_IN_CLK-,+]
[11,12 / TMDS_ROGUE_IN_D0-,+]
[13,14 / TMDS_ROGUE_IN_D1-,+]
[15,16 / TMDS_ROGUE_IN_D2-,+]
Does the CBUS signal outputs from pin of IC2501 ?
Does the CBUS signal inputs to pin of SC1514?
SC1514 : [19 / HDMI4_HPD_CBUS]
IC2501 : [04 / HDMI4_HPD_CBUS]
Does the CBUS signal inputs to pin of SC1514?
SC1514 : [19 / HDMI4_HPD_CBUS]
IC2501 : [04 / HDMI4_HPD_CBUS]
Check the line between SC1514 and IC2501.
No picture on the display (13)
Does not the picture/sound of the MHL input to HDMI-4 go out?
Check the MHL Cable.
Check the IC2501 and peripheral circuits.
Check the line between IC2601 and IC2501.
Does the VBUS signal outputs from pin of SC1514?
Does the VBUS signal isnputs to pin of IC2002 (ucon) ?
SC1514 : [18 / N_MHL_VBUS_DET]
IC2002 : [53 / N_MHL_VBUS_DET]
Does the VBUS signal isnputs to pin of IC2002 (ucon) ?
SC1514 : [18 / N_MHL_VBUS_DET]
IC2002 : [53 / N_MHL_VBUS_DET]
Do TMDS signals input to pins of IC2601 ?
[47,48 / TMDS_ROGUE_OUT_CLK-,+]
[50,51 / TMDS_ROGUE_OUT_D0-,+]
[53,54 / TMDS_ROGUE_OUT_D1-,+]
[55,56 / TMDS_ROGUE_OUT_D2-,+]
[47,48 / TMDS_ROGUE_OUT_CLK-,+]
[50,51 / TMDS_ROGUE_OUT_D0-,+]
[53,54 / TMDS_ROGUE_OUT_D1-,+]
[55,56 / TMDS_ROGUE_OUT_D2-,+]
Check the line between SC1514 and IC2501.
Check the line between SC1514 and IC2002.
SC1514 : [2 / MHL CABLE_SENSE]
IC2501 : [71 / MHL_CABLE_SENCE]
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