DOWNLOAD Sharp LC-70LE747EN (serv.man2) Service Manual ↓ Size: 10.06 MB | Pages: 86 in PDF or view online for FREE

LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU

6 – 10

Does not the picture/sound of the HDMI signal input to HDMI-1/2/3/4 go out?

Is the Hot plug detection function output from pin [19] of the HDMI-
1(SC1501) normal ?

NO

Check the line between SC1501 and pin[59] of IC2601(HDMI-
SW).

Is the Hot plug detection function output from pin [19] of the HDMI-
2(SC1502) normal ?

NO

Check the line between SC1502 and pin[74] of IC2601(HDMI-
SW).

Is the Hot plug detection function output from pin [19] of the HDMI-
3(SC1503) normal ?

NO

Check the line between SC1503 and pin[55] of IC2601(HDMI-
SW).

Is the Hot plug detection function output from pin [19] of the HDMI-
4(SC1504) normal ?

NO

Check the line between SC1504 and pin[50] of IC2601(HDMI-
SW).

YES

NO

Check the setting of an external input device that connects 
with HDMI-1/2/3/4.

Is EDID data pins[58/HDMI1_SCL, 57/HDMI1_SDA] of IC2601accessed, 
and is it read from pins[15, 16] of a HDMI-1(SC1501) ?

NO

Is access possible in the exchange of IC2601 ?

Is EDID data pins[73/HDMI2_SCL, 72/HDMI2_SDA] of IC2601 accessed, 
and is it read from pins[15, 16] of a HDMI-2(SC1502) ?

NO

Is EDID data pins[54/HDMI3_SCL, 53/HDMI3_SDA] of IC2601 accessed, 
and is it read from pins[15, 16] of a HDMI-3(SC1503) ?

Check the peripheral circuit of SC1501/1502/1503/1504 and 
IC2601.

Is EDID data pins[49/HDMI4_SCL, 48/HDMI4_SDA] of IC2601 accessed, 
and is it read from pins[15, 16] of a HDMI-4(SC1504) ?

YES

Do TMDS signals input to pins [26&27/HDMI1_CLKNP, 28&29/
HDMI1_D0NP, 30&31/HDMI1_D1NP, 32&33/HDMI1_D2NP] of IC2601 ?

NO

Check the line between HDMI-1(SC1501) and IC2601.

Do TMDS signals input to pins [17&18/HDMI2_CLKNP, 19&20/
HDMI2_D0NP, 21&22/HDMI2_D1NP, 23&24/HDMI2_D2NP] of IC2601 ?

NO

Check the line between HDMI-2(SC1502) and IC2601.

Do TMDS signals input to pins [8&9/HDMI3_CLKNP, 10&11/HDMI3_D0NP, 
12&13/HDMI3_D1NP, 14&15/HDMI3_D2NP] of IC2601 ?

NO

Check the line between HDMI-3(SC1503) and IC2601.

Do TMDS signals input to pins [99&100/HDMI4_CLKNP, 1&2/
HDMI4_D0NP, 3&4/HDMI4_D1NP, 5&6/HDMI4_D2NP] of IC2601 ?

NO

Check the line between HDMI-4(SC1504) and IC2601.

YES

Do TMDS signals output from pins [87&86/HDMI0_RX_CLKNP_, 85&84/
HDMI0_RX_D0NP_,  83&82/HDMI0_RX_D1NP_,  81&80/
HDMI0_RX_D2NP]  of IC2601 respectively.

NO

Check the IC2601 and peripheral circuits.

YES

Do TMDS signals input to pins [AH34&AH35/HDMI0_RX_CLKNP , 
AG34&AG35/HDMI0_RX_D0NP , AG36&AG37/HDMI0_RX_D1NP , 
AF34&AF35/HDMI0_RX_D2NP]  of IC3301 (Digital AV decode & Main 
CPU)?

NO

Check the line between IC3301 and IC2601.

YES

Refer to  “Refer to “No picture on the display (1)” or  “The sound is not emit-
ted from the Speaker & Woofer though the picture has come out.”

LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU

6 – 11

No picture appears on EXT1 connected monitor during the ATV reception.

Does CVBS signal output from pin [19] of EXT1 (SC505) ?

YES

Check the setting of an external input device that connects with EXT1 .

NO

Does CVBS signal output from pin [5] of IC510 ?
(CAPLESS VIDEO AMP with LPF)

YES

Check the line between  SC505 and  IC510 .

NO

Does CVBS signal input to pin [3] of IC510 ?

YES

Check the peripheral circuits of IC510 .

NO

Does CVBS signal output from pin [2] of IC507 ?

YES

Check the line between  IC507 and  IC510 .

NO

Is CVBS_OUT_MUTE [pin (1)] of IC507 at  “L” ?

YES

Check the line between  IC3301 and IC507 .
Check the peripheral circuits of IC3301 ?

NO

Does CVBS signal input to pin [6] of IC507 ?

YES

Check the peripheral circuits of IC507 .

NO

Check the line between  IC507 and TUNER(TU1101).
(Q1106 etc)

LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU

6 – 12

No picture appears on EXT1 connected monitor during the DTV reception.

Does CVBS signal output from pin [19] of EXT1 (SC505)?

YES

Check the setting of an external input device that connects with EXT1.

NO

Does CVBS signal output from pin [5] of IC510 ?
(CAPLESS VIDEO AMP with LPF)

YES

Check the line between  SC505 and  IC510.

NO

Does CVBS signal input to pin [3] of IC510?

YES

Check the peripheral circuits of IC510.

NO

Does CVBS signal output from pin [2] of IC507?

YES

Check the line between  IC507 and  IC510.

NO

Is CVBS_OUT_MUTE [pin (1)] of IC507 at  “H”

YES

Check the line between  IC3301 and IC507 ?
Check the peripheral circuits of IC3301 ?

NO

Does CVBS signal input to pin [4] of IC507?

YES

Check the peripheral circuits of IC507.

NO

Does CVBS signal output from pin(AU30/CPU_VDACX_OUT) of 
IC3301(Digital AV decode & Main CPU) ?

YES

Check the line between  IC3301 and IC507.
Check the peripheral circuits of IC3301.

NO

Refer to “No picture on the display (3)(4)”.

Does not the  signal input to Network go out?

Does the signal in/output to pins(1),(2),(3),(6) of LAN-jack 
(J9401)?

NO

Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)

YES

Do signals in/output to pins of IC3301 (Digital AV decode & Main 
CPU)?
Pins [AU18&AT18/CPU_DATMDI_RJ45_TNP,  AU17&AT17/
CPU_DATMDI_RJ45_RNP] 

NO

Check the line between IC3301 and J9401.
(T9401 etc)

YES

Check IC3301 and its peripheral circuits.

LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU

6 – 13

Is the AC cord connector tightly connected to the set?

NO

Reconnect the AC cord tightly and turn on the power again.

YES

Are the wire harnesses and other cables properly connected to 
the set?

NO

Reconnect the wire harnesses and other cables properly to the set.

YES

Is power supplied from  pins [15/BU+5V] of [PD]P3801 ?

NO

Replace the power unit.

YES

Is there the pins [14/PS_ON] of [PD]P3801 at “H”?

NO

Check the signal line between PS_ON and IC2004(UCOM)/
IC3301(Digital AV decode & Main CPU) .

YES

Is there the pins [13/AC_DET] of [PD]P3801 at "H"?

NO

Check the power unit ,
and the signal line between AC_DET and IC2004/IC3301.

YES

Is power supplied from pins [5~8/UR+13V] of [PD]P3801 as 
specified?

NO

Check the line between PS_ON and IC2004/IC3301 .

YES

Are the DC/DC converter outputs and the output voltages along

NO

Check the DC/DC converters and the control lines. 
Replace defective parts as required.

1) BU3.3V            (IC9605 etc.)
2) D5V                (IC9607 etc.)
3) U5V                 (IC9607 etc.)
4) D3.3V               (IC9606 etc.)
5) M2.3V               (IC9601 etc.)
6) D1.5V                (IC9604 etc.)
7) D1.2V                (IC9603 etc.) 
8) AT5V               (IC1104 etc.)
9) TE+1.2V              (IC1102 etc.)
10)  IF+1.8V               (IC1109 etc.)
11) SAT+1.2V         (IC1102 etc.)
12) STB+3.3V         (Q9602 etc.)
13) AVDD12_HDMISW    (IC2602)
14) CPU_ADAC+3.3V      (IC3303 etc.)
       (IC3302 etc...)
       (IC3105 etc...)
       (IC1903 etc...)