Read Sharp LC-37RD2E (serv.man5) Service Manual online
LC-32RD2E/RU, LC-37RD2E/RU
4 – 8
No video output during DTV reception. Colour of Images are not right.
D-TUNER UNIT:
Is digital signal fed from pins (20) and (21) of TU201 (TUNER) to
pins (11) and (10) of IC202 (COFDM)?
Is digital signal fed from pins (20) and (21) of TU201 (TUNER) to
pins (11) and (10) of IC202 (COFDM)?
NO
Check TU201 and its peripheral circuits and if I2C is accessed
between TU201 and IC202.
between TU201 and IC202.
YES
Is data FED[0:7] sent from pins (3), (4), (5), (6), (8), (9), (10) and
(11) of P202?
(11) of P202?
NO
Check between IC202 and P202.
DIGITAL UNIT:
YES
Are video signals (R/G/B, CVBS) sent from C4639/C4640/C4641/
C4625?
C4625?
NO
Check R4011 (AC8pin), R4013 (AC9pin) and IC4001 (D-Proces-
sor).
sor).
YES
Are video signals (R/G/B, CVBS) send from the C4636/C4637/
C4638 and emitters of Q4607?
C4638 and emitters of Q4607?
NO
Check Q4601-Q4607 and their peripheral circuits.
MAIN UNIT:
YES
Is video signal (CVBS) sent from pin (7) of IC2801 (SW).
NO
Check IC2801 and its peripheral circuits.
YES
Are video signals (R/G/B, CVBS) fed from pins (179), (180), (181)
and (184) of IC3001?
and (184) of IC3001?
NO
Check peripheral circuits of IC3001.
YES
Are scrambled images not displayed?
YES
DIGITAL UNIT:
Check 5V output of pin (1) of IC4702.
Check 5V of pin (1), (2), (5), (6) of Q4401.
Check 5V output of pin (1) of IC4702.
Check 5V of pin (1), (2), (5), (6) of Q4401.
NO
Refer to “No video output in all modes”.
No audio output during DTV reception. Sound is low.
DIGITAL UNIT:
Is audio signal fed to pins (5) (L-ch) and (10) (R-ch) of IC4604
(OP-AMP)?
Is audio signal fed to pins (5) (L-ch) and (10) (R-ch) of IC4604
(OP-AMP)?
NO
Check R4002 (AD2pin) and IC4001 (D-Processor).
YES
Is audio signal sent from pins (7) and (8) of IC4604 (OP-AMP)?
NO
NO Check power supply of IC4604 (OP-AMP) and its peripheral
circuits.
circuits.
MAIN UNIT:
YES
Is audio signal sent to pins (11) and (4) of IC2721 (SW)?
NO
Check the line between IC4604 and IC2721.
YES
Is D-TUNER-L audio signal sent to pins (10) of IC3001?
Is D-TUNER-R audio signal sent to pins (9) of IC3001?
Is D-TUNER-R audio signal sent to pins (9) of IC3001?
NO
Check output of pins (13) and (3) of IC2721 and peripheral cir-
cuits.
cuits.
YES
Refer to “No sound output in all modes”.
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