Sharp LC-37SD1E Service Manual page 49

D-TUNER UNIT:
Is data FED[0:7] sent from pins (3),(4),(5),(6),(8),(9),(10) and (11)
of P202?
DIGITAL UNIT:
Are video signals (R/G/B,CVBS) sent from C4639/C4640/C4641/
C4625?
Are video signals (R/G/B,CVBS) send from the C4636/C4637/
C4638 and emitters of Q4607?
MAIN UNIT:
Is video signal (CVBS) sent from pin (2) of IC2705(SW).
Are video signals (R/G/B,CVBS) fed from pins (179),(180),(181)
and (184) of IC3002?
Are scrambled images not displayed?
Perform the same check as the model P70E or GD8E.
DIGITAL UNIT:
Is audio signal fed to pins (5) and (10) of IC4604 (OP-AMP)?
Is audio signal sent from pins (7) and (8) of IC4604 (OP-AMP)?
MAIN UNIT:
Is audio signal sent to pin (3) and (13) of IC2704 (SW)?
Perform the same check as the model P70E or GD8E.
No video output during DTV reception. Colour of Images are not right.
YES
YES
YES
YES
YES
NO
No audio output during DTV reception. Sound is low.
YES
YES
YES
NO Check R272 and R273.
NO Check R4011(AC8pin),R4013(AC9pin) and IC4001(D-Proces-
sor).
NO Check Q4601-Q4605,Q4607 and their peripheral circuits.
NO Check power supply and pin (1) of IC2705(SW).
YES DIGITAL UNIT:
Check 5V output of pin (1) of IC4702.
Check 5V of pin (6) of Q4401.
NO Check R4002(AD2pin) and IC4001(D-Processor).
NO Check power supply of IC4604(OP-AMP) and its peripheral cir-
cuits.
NO heck power supply and pins (9) and (10)of IC2704(SW) and
audio signal input of pins (4) and (11) of IC2704.
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LC-37SA1E/RU