Sharp LC-50U35T Service Manual page 27

HDMI:No external input video [HDMI1]
Is HDMI1 selected on the input select menu screen?
YES
D o e s h t e H O T P L U G d e e t t c o i n u f n
Does the DDC5V signal come from pin(18) of SC1501 to
pin(102) of IC2502(HDMI-SW)?
YES
Does the HPD signal come from pin(142) of IC2502 to pin(19) of
SC1501?
YES
Is IC2502(HDMI-SW) accessed by I2C, with HDMI connected, to
read the DDC-I2C SCL/SDA data?
YES
Does the HPD signal come from pin(F31/F30) of IC3303 to
pin(110/113) of IC2502?
YES
Are there the TMDS signals at input pins of IC3301(CPU)?
YES
Is the T-CON PWB connected?
V_LOCKN pin(26) of SC3802 become Low if there is no problem
in the connection.
YES
Are the V-By-One HS signal input to the pin of SC3802?
V_VBO_TX_1+/-(23/24pin), V_VBO_TX_2+/-(20/21pin),
V_VBO_TX_3+/-(17/18pin),
V_VBO_TX_4+/-(14/15pin), V_VBO_TX_5+/-(11/12pin),
V_VBO_TX_6+/-(8/9pin), etc
YES
Check the panel module and harness.
No video (1)-1
t c o i n ?
NO Select HDMI1 on the input select menu screen for the right input sig-
nal.
N O C h e k c h t e line between the pin(18) of SC1501 and the pin(102) of
IC2502.
NO Check the line between the pin(19) of SC1501 and the pin(142) of
IC2502.
Check the DDC-I2C line and its peripheral circuits..
NO
SC1501 pin(15)(SCL), pin(16)(SDA)
IC2502 pin(101)(SCL), pin(99)(SDA)
NO Check the line between the pin(F31/F30) of IC3303 and the pin(110/
113) of IC2502.
Check the TMDS line (between SC1501 and IC2502) and its periph-
eral circuits.
NO
[IC2502 TMDS input pins]
pin(145/146)(CLK-/+), pin(149/150)(D0-/+),
pin(151/152)(D1-/+), pin(153/154)(D2-/+).
Check the TMDS line (between IC2502 and IC3303) and its periph-
eral circuits.
[IC3303 TMDS input pins]
pin(B24/A24)(TMDS0_CLK-/+), pin(D23/C23)(TMDS0_D0-/+),
pin(D22/C22)(TMDS0_D1-/+), pin(B22/A22)(TMDS0_D2-/+).
pin(B21/A21)(TMDS1_CLK-/+), pin(B20/A20)(TMDS1_D0-/+),
pin(B19/A19)(TMDS1_D1-/+), pin(B18/A18)(TMDS1_D2-/+).
Check SC1501, IC2502, IC3303 and its peripheral circuits.
Check the T-CON PWB and harness.
NO
Check IC3303 and SC3802 and their peripheral circuits in Main
PWB.
Check IC3303 and its peripheral circuits.(IC3501/IC3502/IC3503,
etc.)
NO
6 – 5
LC50/58/65U35T