Sharp LC-42D43U Service Manual page 31

No video output from HDMI input (INPUT4)
Are signals fed from HDMI (SC1501) connector to input terminals
H_RX0± (pins 70 and 71), H_RX1± (pins 73 and 74), H_RX2±
(pins 76 and 77) and H_RXC± (pins 67 and 68) of IC1507
(TMDS_SW)?
Are signals fed from IC1507 (TMDS_SW) to input terminals
H_RX0± (pins B19 and A19), H_RX1± (pins A18 and B18),
H_RX2± (pins D18 and C18) and H_RXC± (pins C19 and D19)
of IC8101 (Broadcom)?
Are digital video (LVDS) signals sent from pins 37-42 and 45-48
of IC2602?
Are digital video (COMOS) signal sent from IC8101 (DVODATA 0
~ 23, DVOCLKO, DVODE, DVOHSYNC, DVOVSYNC)?
Check LCD_CONTROL PWB.
When using an old HDMI transmission device, some video formats cannot be selected or no sound is heard. Since this model conforms to the latest
HDMI standard, the HDMI transmission device does not recognize the data of the latest version correctly. It is necessary to upgrade its firmware.
Download the latest firmware from the web site of each manufacturer, or contact the customer service center of each manufacturer.
INPUT4
YES
YES
YES
NO
2
Is IC1501 (E PROM) accessed with I2C when connecting HDMI
device and is DDC_I2C_CLOCK/DATA data read out?
Check IC1501 and peripheral circuits.
Are cables connected securely?
YES
Check the setting of HDMI device.
NO Check IC1507 (TMDS_SW) and peripheral circuits.
For INPUT4, pin 21 is Low and pin 22 is High.
NO Check IC2602 and peripheral circuits.
NO Check IC8101 and peripheral circuits.
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LC-42D43U
NO