Sharp LC-60LE660U Service Manual page 48

LC-60/70LE660U,C6600U
No video at UHF/VHF broadcast signal reception
Are there the IF signal at input pins(24/25)(IF_N/P) of IC3301(CPU)?
Check the IF signal line between IC3301 and TU1101, and
their peripheral circuits.
Check the Tuner I2C lines.
(1)TU1101:pin(10)(SCL), pin(11)(SDA)
(2)IC3301:pin(39), pin(40)
YES
Does the analog audio signal come from pins(11/12)(SP_L/SP_R) of IC3301(CPU) to pins(22/32)(SP_L/SP_R) of IC1701(Audio AMP)?
Check the audio line between IC3301 and IC1701, and their paripheral circuits.
YES
•About the L/R Speakers.
Check the connector (P1701) L/R speakers and their peripheral circuits.
Check the RF cable and Antena condition
No audio (3)
Is the specified TV signal selected on the input select menu screen?
NO
6 – 14
No video at digital broadcast signal reception
Are there the IF signal at input pins(24/25)(IF_N/P) of IC3301(CPU)?
Is there IF-AGC signal at input pin(5) of TU1101?
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)
YES
NO
YES
NO