Sharp AQUOS LC-20D42U, Service Manual, Page: 38 / 120

38
LC-20D42U
TROUBLESHOOTING TABLE
(Continued)
No video output from HDMI input (INPUT4)
No
Yes Yes
Is IC1501(E
2
PROM) accessed with 12C when connectiong
HDMI device and is DDC_12C_CLOCK/DATA data read
out?
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)?
Yes
Check IC1507 (TMDS_SW) and peripheral circuits.
For INPUT4,pin 21 is Low and pin 22 is High.
Check LCD_CONTROL PWB.
Check IC1501 and peripheral circuits.
Are cables connected securely?
No
Yes
Are digital video (LVDS) signals sent from pins 37-42 and
45-48 of IC2602?
Check IC2602 and peripheral circuits.
No
Are digital video (COMOS) signal sent from IC8101
(DVODATA 0-23,DVOCLKO,DVODE,DVOHSYHC,
DVOVSYNC)?
Check IC8101 and peripheral circuits.
No
Check the setting of HDMI device.
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.