Sharp Aquos LC-42BX5H, Service Manual

Page: 36 / 154

LC-42BX5H/M/X
6 – 11
No audio heard (6)
No sound from the HDMI sound input terminal.
(INPUT 4 analog audio)
YES
Is there the L-ch audio signal input from pin (4) of external input
terminal J3401 (HDMI AUDIO IN) to pin (44) of IC3401?
Is there the R-ch audio signal input from pin (2) of external input
terminal J3401 (HDMI AUDIO IN) to pin (42) of IC3401?
YES
Are there the L-ch and R-ch audio signal outputs at pins (36) and
(35) of IC3401 (SW), respectively? NO Check IC3401 and its peripheral circuits.
YES
Are audio signals of L-ch and R-ch input in to the pins (56) and
(57) for volume, equalizer and sound of IC1301 normally and
output from the pins (28) and (27) normally? NO Check peripheral circuits of IC1301.
YES
Are there the L-ch and R-ch audio signal outputs at pins (20),
(21) and (40), (41) of IC1303 (AMP), respectively? NO Check IC1303 and its peripheral circuits.
YES
Are there the L-ch and R-ch audio signal inputs at pins (1), (2)
and (3), (4) of P5007, respectively?
No audio heard (7)
No PC audio output
YES
Pin (2) of J3402: Is L-ch input into the pin (17) of IC3401?
Pin (3) of J3402: Is R-ch input into the pin (18) of IC3401?
YES
Are there the L-ch and R-ch audio signal outputs at pins (36) and
(35) of IC3401 (SW), respectively? NO Check IC3401 and its peripheral circuits.
YES
Are audio signals of L-ch and R-ch input in to the pins (56) and
(57) for volume, equalizer and sound of IC1301 normally and
output from the pins (28) and (27) normally? NO Check peripheral circuits of IC1301.
YES
Are there the L-ch and R-ch audio signal outputs at pins (20),
(21) and (40), (41) of IC1303 (AMP), respectively? NO Check IC1303 and its peripheral circuits.
YES
Are there the L-ch and R-ch audio signal inputs at pins (1), (2)
and (3), (4) of P5007, respectively?