Sharp LC-19D1E/S-BK/WH, Руководство по обслуживанию

Страница: 52 / 160

LC-19D1E/S-BK/WH
4 – 6
No sound (2) (during the reception of TV broadcasting)
No audio output during UHF/VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control?
• • •
Set the desired volume.
2) Is ANT-CABLE disconnected or connected improperly?
• • •
Connect it correctly as per the operation manual.
(AV-UNIT) YES
Is the audio signal (L/R) output from pins (34) and (33) of IC501
(AV-SW)?
NO
(MAIN-UNIT) YES
Is the audio signal (LOUT2/ROUT2) output form pins
(25) and (23) of IC302 (A-CODEC) properly? NO Check pins (1) and (4) of IC302 (A-CODEC), pins (11) and (12)
of Connector SC1202,audio-mute line (Q301/Q302) or peripheral
circuits.
YES
Is the audio signal L-CH output to pins (44-45) and
(40-41) of IC303 (POWER-AMP) and also the audio
signal R-CH output to pins (21-22) and (16-17) of
IC303 (POWER-AMP) properly? NO Check UR12V power supply input pins (47) and (14) of IC303
(POWER-AMP) or peripheral circuits.
YES
Is the audio signal of pins (1), (2), (3) and (4) of P301
(SP-Connector) output normally? NO Check SP- Connector (P301) and peripheral circuits.
YES
Check SP-BOX (right and left) and WIRE HARNESS.
(MAIN-UNIT)
Is the MPX/PC/HDMI_A_L/R signal output to pins (11) and (15)
of IC301 (A-Selector)?
YES Check either pins (9) and(10) of Connector SC1202 or pins (9)
and(10) of Connector P501. Or check peripheral circuits.
NO
Is the audio signal (DVPM2_L/R) output from pins (B23) and
(D23) of IC801 (DVP-M2)? YES Check pins of (6) and (1) of IC301 (A-Selector), pin(14) of power
supply 9V and peripheral circuits.
NO
Is the audio signal (SIF) input to pin (A21) of IC801 (DVP-M2)? YES Check the power supply B1.5V pins (C18) and B3.3V pins (A18)/
(A22) are supplied to IC801 (DVP-M2).
Or check peripheral circuits.
(AV-UNIT) NO
Is the SIF signal output from pin (12) of Q210(BUFFER)? YES Confirm pin (7) of Connector SC1202 or pin (7) of Connector
P501. Or please check the peripheral circuit.
Is the SIF signal output from pin (4) of Tuner (TU201)? YES Check Q203,Q210 and peripheral circuit.
NO
Check the B5V/B5V(CONT)/IF5V power supply input pin (11)/(1)/
(3) of TUNER (TU201), SDA/SCA signal pins (9)/(8) and AGC
signal pin (15). YES Replace Tuner (TU201).