LC-52/60/70LE640U,C6400U (1st Edition)
6 – 9
No video (3)
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?
Is there the analog video signal output (CVBS) at pin (9) of
tuner (TU1105)?
Are there the IF signal outputs (D_IF+/-) at the pins (11) and (10) of tuner
(TU1105)?
YES
NO
YES
NO
Check TU1105 and its peripheral circuits
(TU_SDATA: Pin4 of TU1105
TU_SCLK: Pin5 of TU1105, etc.).
Check the line between TU1105 and IC4405, and
their peripheral circuits (C4463/C4464/R1158, etc.).
Is there the analog video signal input at pin (AK24) of IC3303
(CPU)?
Are there the TS signal outputs (ATSC_TS_D0/SYNC/CLK/VAL) at the
pins (33), (34), (37) and (38) of Demodulator (IC4405)?
YES
NO
YES
NO
Check the line between IC3303 and TU1105, and
their peripheral circuits.
Check the line between IC4405 and IC3303, and
their peripheral circuits (R4450/R3365/R3432, etc.).
Is the T-CON PWB connected?
VBO_HTPDN (40pin), VBO_LOCKN (39pin) of P2604 become Low if there is no
problem in the connection.
NO
Check the panel module and harness.
YES
Are the V-By-One signal input to the pin of P2604?
VBO/- (36/37pin), VBO/- (32/33pin),
VBO/- (28/29pin), VBO/- (24/25pin).
NO
Check IC3303 and its peripheral circuits.
(IC3501/IC3502/IC3503, etc.)
YES
Check the panel module and harness.
