Sharp LC-60G9T, Service Manual, Page: 43 / 108

LC-60G9T / LC-70G9T
6 – 1
CHAPTER 6.
TROUBLESHOOTING
TABLE
[1] TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
The sound is not emitted from the Speaker & Woofer though the picture has come out.
No sound output in all modes?
YES
Do audio signals output from pins of IC3301 (Digital AV decode & Main CPU) ?
[AP11/CPU_AOLRCK, AR11/CPU_AOBCK, AN9/CPU_AOSDATA0]
NO
Check IC3301 and its peripheral circuits.
YES
Do audio signals input to pins[5,6,7] of IC1703(DSP) ?
NO
Check the line between IC3301 and IC1703.
YES
Do audio signals output from pins of IC1703 ?
[21/AMP_BCLK, 26/AMP_LRCLK, 27/AMP_DATA_LR, 28/AMP_DATA_WO,
30/AMP_MCLK]
NO
Check IC1703 and its peripheral circuits.
YES
In the case that the sound is not emitted from the Speaker , refer to (A).
In the case that the sound is not emitted from the Woofer , refer to (B).
(B)
(A)
Do audio signals input to pins[5,6,7,8] of IC1901 (SP_AMP) ?
NO
Check the line between IC1703 and IC1901.
YES
Do audio signals output from pins of IC1901 ?
[27/OUTML, 30/OUTPL, 11/OUTPR, 15/OUTMR]
NO
Check IC1901 and its peripheral circuits.
YES
Is AMP_MUTE [pin(24)] of IC1901 at "H" ?
NO Check the line between IC1901 and IC3301 &
IC2004(UCOM).
(Q1702,D1702 etc)
YES
Do audio signals input to pins[1&2/L-ch, 3&4/R-ch] of P1903 ?
NO
P1903 terminal and the peripheral circuit (L/C filter) are
checked.
YES
Check Speaker (right and left) and wire harness.
(B)
Do audio signals input to pins[5,6,7,8] of IC1902 (Woofer_AMP)?
NO
Check the line between IC1703 and IC1902.
YES
Do audio signals output from pins of IC1902 ?
[27/OUTML, 30/OUTPL, 11/OUTPR, 14/OUTMR]
NO
Check IC1902 and its peripheral circuits.
YES
Is AMP_MUTE [pin(24)] of IC1902 at "H" ?
NO Check the line between IC1902 and IC3301 &
IC2004(UCOM).
(Q1702,D1702 etc)
YES
Do audio signals input to pins [1/SUB(+), 2/SUB(-)] of P1904 ?
P1904 terminal and the peripheral circuit (L/C filter) are
checked.
YES
Check Woofer and wire harness.