Sharp AQUOS LC-20D42U, Руководство по обслуживанию

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40
LC-20D42U
TROUBLESHOOTING TABLE
(Continued)
No video output from PC input (INPUT6)
Yes
Yes
Yes
Are signal fed from pins 1,2,3(Analog-R/G/B),and 13,14(H
Sync/V Sync) of input terminal (SC1503) to pins 11,9,6,2,3
of IC3304 (A/DC)?
IS IC1505(E
2
PROM) accessed 12C when connecting PC
and is DDC_12C_CLOCK/DATA data read out?
Are signals from pins 83-76,62-55,50-43,71-68.(DATA0-23,VSYNC,HSYNC,DE,CLK) of IC3304 (ADC) toB23,A23,D22,C22,
E23,A25,D23,B24,F22,A24,C23,E22,D17,F18,E18,F17,E17,C17,B17,A17,C16,D16,F16,E16 ,F23,G22,C25,C24 of IC1801?
Yes
Check LCD_CONTROL PWB.
Check peripheral circuits of IC3304
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
(DVODATA0>23,DVOCLKO,DVODE, DVOHSYHC,
DVOVSYNC)?
Check IC8101 and peripheral circuits.
No
Check the setting of PC.
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.
DIGITAL mode
Analog mode
Check IC1505 and periph-
eral circuits.Are cable con-
nected securely?
No
No
Check connection of IC3304 and IC8101.
No
Digital broadcasting cannot be received.
[FRONT-END SECTION]
Yes
Are IF_OUT_P/N signal send from
pin (20) (19) of TU1101 respectively?
No
No
Are signal fed to pins U25,U26 of
IC8101? Check IC8101 and its peripheral cir-
cuits.
Yes
Yes
Check the TU1101.
Check between TU1101 and
IC8101(C1104,C1141,etc.).