Sharp LC-20B2EA, Руководство по обслуживанию

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16
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No sound (1/2)
Check all the settins microprocessor's adjust process menu.
Is the pin (53) of IC2001 in the "L" state? Is output at pins (27) and (28) of IC1901 normal? Is output at pins (1) and (7) of IC1903 normal?
Yes Yes
No No No
No sound from front speakers
Yes
Muting effect is on. Check the FSMUTE line.
Check IC1901 and its peripheral parts. Check IC1903 and its peripheral parts.
Is the pin (52) of IC2001 in the "L" state?
Is output at pins (24) and (25) of IC1901 normal? Is output at pins (1) and (7) of IC304 normal?
Yes Yes
No No No
Yes
Muting effect is on. Check the HP_MUTE line.
Check IC1901 and its peripheral parts. Check IC304 and its peripheral parts.
No sound from headphone
TV sound failure
Is output at pins (33) and (34) of IC1901 normal?
Is output at pins (1) and (7) of IC3500 normal?
Check IC1901 and its peripheral parts. Check IC3500 and its peripheral parts.
Yes
No
No
No
No sound from output line
Check the tuner and its peripheral parts.
Yes
No
Is output at pin (11) of Tuner normal?
Is input at pins (67) and (69) of IC1901.
Check IC1901 and its peripheral parts.
Check Headphone Jack and connection cable.
No
Is output at pins (8) and (12) of IC3305 normal?
Check IC3305 and its peripheral parts.
Check front speaker and connection cable.
Yes