Sharp LC-32HT2U Service Manual page 42

LC-32HT2U
No video output from HDMI input (INPUT4)
Are signals fed from HDMI (SC1502) 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 54 and 55), H_RX1± (pins 58 and 59), H_RX2±
(pins 61 and 62) and H_RXC± (pins 50 and 51) of IC1508
(HDCP_LSI)?
Are R/G/B and CLK/H/V/Data Enable signals sent from pins 92-
96, 99-105,108-111, 114-117, 121-124, 119 and 127-129 of
IC1508 (HDCP_LSI)?
Are digital video (LVDS) signals sent from pins 28-31 and 34-37
of IC3301 (Trident)?
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 website of each manufacturer, or contact the customer service center of each manufacturer.
INPUT4
YES
YES
YES
YES
NO
2
Is IC1502 (E PROM) accessed with I2C when connecting HDMI
device and is DDC_I2C _CLOCK/DATA data read out?
Check IC1502 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.
For INPUT5, pins 21 and 22 are Low and pin 23 is High.
NO Check IC1508 (HDCP_LSI) and peripheral circuits.
NO Check peripheral circuits of IC3301.
6 – 9
NO