LC-60/70LE660U,C6600U
6 – 11
No video (4)
PC:No external input video [PC-IN]
Is PC-IN selected on the input select menu screen?
YES
NO
Select PC-IN on the input select menu screen for the right input signal.
Is IC3301(CPU) accessed by I2C, with PC connected, to read the VGA_SCL/_SDA data?
Check the DDC-I2C line and its peripheral circuits..
(1)SC501 pin(15)(SCL), pin(12)(SDA)
(2)IC3301 pin(112), pin(113)
Are there the video signal inputs at pin(166)(R), pin(165)(G) ,pin (163)(B) and pin(164) of IC3301(CPU)?
Are there the VSYNC/HSYNC signal inputs at pins(161) and (162) of IC3301?
YES
NO
Check the line between SC501 and IC3301, and their peripheral circuits.
Check the RGB cable and change resolution format(PC side)
No video (5)
No video at UHF/VHF broadcast signal reception No video at digital broadcast signal reception
Is the specified TV signal selected on the input select menu screen?
Are there the IF signal at input pins(24/25)(IF_N/P) of IC3301(CPU)? Are there the IF signal at input pins(24/25)(IF_N/P) of IC3301(CPU)?
YES
NO
Is there IF-AGC signal at input pin(5) of TU1101?
Check the IF signal line between IC3301 and TU1101,
and their peripheral circuits.
YES
NO
Check the Tuner I2C lines.
(1)TU1101:pin(10)(SCL), pin(11)(SDA)
(2)IC3301:pin(39), pin(40)
Check the IF signal line between IC3301 and TU1101,
and their peripheral circuits.
Check the IF-AGC line between pin(38) of IC3301 and
pin(5) of TU1101.
Check the Tuner I2C lines.
(1)TU1101:pin(10)(SCL), pin(11)(SDA)
(2)IC3301:pin(39), pin(40)
Check the RF cable and Antena condition
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