LC-90LE757E - Sharp TV Service Manual (repair manual). Page 57

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.”