Sharp Aquos LC-42X20E, Service Manual

Page: 66 / 192

LC-32X20E/S/RU, LC-37X20E/S/RU
4 – 16
<When EXT4 is used for external input> No picture on the display (9)
Does not the picture of the HDMI signal input to EXT4 go out?
MINI AV_UNIT:
Is the HDMI detection function output from pin (19) of the HDMI
terminal (SC1503) normal?
NO Check between SC1503 and IC1507 (HDMI_SW) of pin (56).
(IC1508, etc.)
YES
Is EDID data pin (6)/SCL, pin (5)/SDA of IC1505 (EEPROM)
accessed, and is it read from pin (15), (16) of a HDMI terminal
(SC1503)? NO Is access possible in the re-writing or exchange of EDID data of
IC1505?
YES
NO
Check the circumference circuit of SC1503, IC1505 and IC1507.
Is TMDS signal input into pin (59,58)/TMDS6_CLK
±
, (62, 61)/
TMDS6_D0
±
, (65, 64)/TMDS6_D1
±
, (68, 67)/TMDS6_D2
±
of
IC1507 from SC1501?
NO Check the line between connector (SC802) and IC1507.
(SC802, SC1503 and Wire harness (HM))
YES
Is each signal output from pin (10, 11)/TMDS_CLKP/N, (7, 8)/
TMDS_D0P/N, (4, 5)/TMDS_D1P/N, (1, 2)/TMDS_D2P/N, (77,
78)/SDA_SINK/SCL_SINK, (79)/DDC5VOR_A of IC1507? NO Is the control signal named IC1507 and IC9101 (CPLD) normal?
(HDMI_SW_INT, HDMI_RST, etc.)
YES
Is each signal of IC3301 (VIDEO_PROCESSOR) pin (L1, L2)/TMDS_CLKP/N, (M1, M2)/TMDS_D0P/N, (N1, N2)/TMDS_D1P/N, (P1, P2)/
TMDS_D2P/N, (T11, U11)/SDA_SINK/SCL_SINK, (T10)/DDC5VOR_A input?
YES NO
Refer to “The picture doesn't appear in all modes.” Check the line between SC1101 and IC3301.