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No sound from EXT8 (CVBS-A-IN) connecting an external input
device.
<EXT8>
Is CVBS-L audio signal input to pin (5) of EXT8 (J505)?
Is CVBS-R audio signal input to pin (4) of EXT8 (J505)?
Is CVBS-L audio signal input to pin (52) of IC1302 (A-SW)?
Is CVBS-R audio signal input to pin (51) of IC1302 (A-SW)?
Is the audio signal (A_IN_L/R) properly output from pins (6) and
(7) of IC1302 (A-SW)?
Is the audio signal (A_OUT_SP_L/R) properly output from pins
(H26) and (H25) of IC3303 (VCT)?
It is the same as the above-mentioned A-BLOCK.
No audio output from EXT1 (SCART1) terminal.
Checklist:
1) Is the MUTE button on the remote control set to ON? ••• Set to OFF.
2) Check the connection to external devices. •••Is there any improper connection?
Is audio signal output to pins (3) and (1) of EXT1 (SCART1)
(SC503)?
Is the SC1-MUTE signal of base (5) (2) pin of Q502 "H"?
Is the audio output signal (TUNER_OUT_L/R) output from pins
(11) and (10) of IC1301 (DAC) normal?
Is the audio output signal (I2S_DATA_TU) output from pins (B25)
of IC3303 (VCT) normal?
The input source of the audio is decided from TUNER. Is the SIF
signal input to pin (AB25) of IC3303 (VCT)?
TUNER: TU1102
Check Q1101 (AMP), and pin (4) of TUNER.
No sound from external input devices (2-2)-3
YES
YES
YES
YES
No sound of external device (3-1)-1
NO
NO
NO
NO
NO
NO
Check S9V power supply (10) (15) pin, D3.3V power supply (3)
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW)
or the peripheral circuit.
NO
Check D3.3V power supply pin (F18) of IC3303 (VCT) and the
soldering confirmation or the peripheral circuit.
YES
Check EXT1 (SCART1) (SC503) and the connection to an exter-
nal device.
YES
The Q502 base should usually be "L".
If it is "H" signal, Check whether base of Q1301 is "L" or periph-
eral circuit.
YES
Check whether there are problems in IC1301 and Q502 or
peripheral circuits.
YES
Check whether there is problem in IC3303.
YES
Check whether there are problems in the power supply and sol-
dering IC3303 or peripheral circuits.
5 – 9
LC-32/40/46LE600E/RU/S
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