Sharp LC-37XD1E Service Manual page 39

No video output during
DTV reception. Colors
of Images are not right.
D-TUNER UNIT: NO
Is data FED[0:7] sent
from pins
(3),(4),(5),(6),(8),(9),
(10) and (11) of P202?
YES
DIGITAL UNIT: NO
Are video signals (R/G/
B,CVBS) sent from
C4639/C4640/C4641/
C4625?
YES
Are video signals (R/G/ NO
B,CVBS) send from the
C4636/C4637/C4638
and emitters of Q4607?
YES
MAIN UNIT:
Are video signals (R/G/
B,CVBS) fed from pins
(AA18),(AB18),(Y18)
and (AA21) of IC3002?
YES
Are scrambled images YES
not displyed?
NO
Perform the same
check as the tuner (U/V)
reception.
DTV troubleshooting 2
Check R272 and R273.
Check
R4011(AC8pin),R4013(A
C9pin) and IC4001(D-Pro-
cessor).
Check Q4601-
Q4605,Q4607 and their
peripheral circuits.
DIGITAL UNIT:
Check 5V output of pin (1)
of IC4702.
Check 5V of pin (6) of
Q4401.
4 – 8
No audio output during
DTV reception. Sound
is low.
DIGITAL UNIT: NO
Is audio signal fed to
pins (5) and (10) of
IC4604 (OP-AMP)?
YES
Is audio signal sent NO
from pins (7) and (8) of
IC4604(OP-AMP)?
YES
MAIN UNIT: NO
Is audio signal sent to
pin (3) and (13) of
IC2704 (SW)?
YES
Perform the same
check as the tuner (U/
V) reception.
LC-37XD1E/RU
Check R4002(AD2pin)
and IC4001(D-Proces-
sor).
Check power supply of
IC4604(OP-AMP) and its
peripheral circuits.
Check power supply and
control signal of pins (9)
and (10) of IC2704(SW)
and audio signal input of
pins (4) and (11) of
IC2704.
.