Sharp Aquos LC-42D72U, Service Manual

Page: 39 / 162

LC-42D72U
4 – 8
Check the DDC line and its peripheral circuits
(IC1502 (EEPROM) and its peripherals). Check the DDC line and its peripheral cir-
cuits (IC1501 (EEPROM) and its
peripherals).
Does the signal come from pins (34 and 35) (CLK
±
), (31 and 32) (D0
±
), (28 and 29)
(D1
±
), and (25 and 26) (D2
±
) of IC1507 to pins (50 and 51), (54 and 55), (58 and 59), and
(62 and 63) of IC1508?
NO
Check IC1507, IC1508 and their periph-
eral circuits.
YES
Are there the U3VINY[7:0], U3VINR[7:0], U3VINPBPR[7:0], U3VDIN, U3HDIN, U3DEIN
and U3VINCLK signal outputs from IC1508?
NO
Check IC1508 and its peripheral circuits.
YES
Are there the U3VINY[7:0], U3VINR[7:0], U3VINPBPR[7:0], U3VDIN, U3HDIN, U3DEIN
and U3VINCLK signal inputs at IC3301 (VPC)?
NO
Check the line between IC1508 and
IC3301.
YES
Is there the LVDS signal output at the LVDS 1st channel and 2nd channel of IC3301?
TA2_P/M(AJ30/AK30), TB2_P/M(AJ29/AK29), TC2_P/M(AJ28/AK28), TD2_P/M(AJ26/
AK26), TE2_P/M(AJ25/AK25), TF2_P/M(AJ24/AK24), TCLK2_P/M(AJ27/AK27), TA1_P/
M(AB29/AB30), TB1_P/M(AC29/AC30), TC1_P/M(AD29/AD30), TD1_P/M(AF29/AF30),
TE1_P/M(AG29/AG30), TF1_P/M(AH29/AH30), TF1_P/M(AH29/AH30), TCLK1_P/
M(AE29/AE30)
NO
Check IC3301 and its peripheral control
circuits (IC3501, IC3502, IC8101, etc.).
YES
Check the panel module.